/* * Copyright 2015 Google Inc. * * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ #include "include/core/SkBitmap.h" #include "include/core/SkCanvas.h" #include "include/core/SkString.h" #include "include/private/SkMacros.h" #include "include/utils/SkTextUtils.h" #include "samplecode/Sample.h" #include "src/core/SkGeometry.h" #include "src/core/SkPathPriv.h" #include "src/core/SkPointPriv.h" #include "src/pathops/SkIntersections.h" #include "src/pathops/SkOpEdgeBuilder.h" #include "tools/ToolUtils.h" #if 0 void SkStrokeSegment::dump() const { SkDebugf("{{{%1.9g,%1.9g}, {%1.9g,%1.9g}", fPts[0].fX, fPts[0].fY, fPts[1].fX, fPts[1].fY); if (SkPath::kQuad_Verb == fVerb) { SkDebugf(", {%1.9g,%1.9g}", fPts[2].fX, fPts[2].fY); } SkDebugf("}}"); #ifdef SK_DEBUG SkDebugf(" id=%d", fDebugID); #endif SkDebugf("\n"); } void SkStrokeSegment::dumpAll() const { const SkStrokeSegment* segment = this; while (segment) { segment->dump(); segment = segment->fNext; } } void SkStrokeTriple::dump() const { SkDebugf("{{{%1.9g,%1.9g}, {%1.9g,%1.9g}", fPts[0].fX, fPts[0].fY, fPts[1].fX, fPts[1].fY); if (SkPath::kQuad_Verb <= fVerb) { SkDebugf(", {%1.9g,%1.9g}", fPts[2].fX, fPts[2].fY); } if (SkPath::kCubic_Verb == fVerb) { SkDebugf(", {%1.9g,%1.9g}", fPts[3].fX, fPts[3].fY); } else if (SkPath::kConic_Verb == fVerb) { SkDebugf(", %1.9g", weight()); } SkDebugf("}}"); #ifdef SK_DEBUG SkDebugf(" triple id=%d", fDebugID); #endif SkDebugf("\ninner:\n"); fInner->dumpAll(); SkDebugf("outer:\n"); fOuter->dumpAll(); SkDebugf("join:\n"); fJoin->dumpAll(); } void SkStrokeTriple::dumpAll() const { const SkStrokeTriple* triple = this; while (triple) { triple->dump(); triple = triple->fNext; } } void SkStrokeContour::dump() const { #ifdef SK_DEBUG SkDebugf("id=%d ", fDebugID); #endif SkDebugf("head:\n"); fHead->dumpAll(); SkDebugf("head cap:\n"); fHeadCap->dumpAll(); SkDebugf("tail cap:\n"); fTailCap->dumpAll(); } void SkStrokeContour::dumpAll() const { const SkStrokeContour* contour = this; while (contour) { contour->dump(); contour = contour->fNext; } } #endif SkScalar gCurveDistance = 10; #if 0 // unused static SkPath::Verb get_path_verb(int index, const SkPath& path) { if (index < 0) { return SkPath::kMove_Verb; } SkPoint pts[4]; SkPath::Verb verb; SkPath::Iter iter(path, true); int counter = -1; while ((verb = iter.next(pts)) != SkPath::kDone_Verb) { if (++counter < index) { continue; } return verb; } SkASSERT(0); return SkPath::kMove_Verb; } #endif static SkScalar get_path_weight(int index, const SkPath& path) { SkPoint pts[4]; SkPath::Verb verb; SkPath::Iter iter(path, true); int counter = -1; while ((verb = iter.next(pts)) != SkPath::kDone_Verb) { if (++counter < index) { continue; } return verb == SkPath::kConic_Verb ? iter.conicWeight() : 1; } SkASSERT(0); return 0; } static void add_path_segment(int index, SkPath* path) { SkPath result; SkPoint firstPt = { 0, 0 }; // init to avoid warning SkPoint lastPt = { 0, 0 }; // init to avoid warning int counter = -1; SkPoint chop[7]; SkConic conicChop[2]; for (auto [verb, pts, w] : SkPathPriv::Iterate(*path)) { if (++counter == index) { switch (verb) { case SkPathVerb::kLine: result.lineTo((pts[0].fX + pts[1].fX) / 2, (pts[0].fY + pts[1].fY) / 2); break; case SkPathVerb::kQuad: { SkChopQuadAtHalf(pts, chop); result.quadTo(chop[1], chop[2]); pts = chop + 2; } break; case SkPathVerb::kConic: { SkConic conic; conic.set(pts, *w); if (!conic.chopAt(0.5f, conicChop)) { return; } result.conicTo(conicChop[0].fPts[1], conicChop[0].fPts[2], conicChop[0].fW); pts = conicChop[1].fPts; w = &conicChop[1].fW; } break; case SkPathVerb::kCubic: { SkChopCubicAtHalf(pts, chop); result.cubicTo(chop[1], chop[2], chop[3]); pts = chop + 3; } break; case SkPathVerb::kClose: { result.lineTo((lastPt.fX + firstPt.fX) / 2, (lastPt.fY + firstPt.fY) / 2); } break; default: SkASSERT(0); } } switch (verb) { case SkPathVerb::kMove: result.moveTo(firstPt = pts[0]); break; case SkPathVerb::kLine: result.lineTo(lastPt = pts[1]); break; case SkPathVerb::kQuad: result.quadTo(pts[1], lastPt = pts[2]); break; case SkPathVerb::kConic: result.conicTo(pts[1], lastPt = pts[2], *w); break; case SkPathVerb::kCubic: result.cubicTo(pts[1], pts[2], lastPt = pts[3]); break; case SkPathVerb::kClose: result.close(); break; default: SkASSERT(0); } } *path = result; } static void delete_path_segment(int index, SkPath* path) { SkPath result; int counter = -1; for (auto [verb, pts, w] : SkPathPriv::Iterate(*path)) { if (++counter == index) { continue; } switch (verb) { case SkPathVerb::kMove: result.moveTo(pts[0]); break; case SkPathVerb::kLine: result.lineTo(pts[1]); break; case SkPathVerb::kQuad: result.quadTo(pts[1], pts[2]); break; case SkPathVerb::kConic: result.conicTo(pts[1], pts[2], *w); break; case SkPathVerb::kCubic: result.cubicTo(pts[1], pts[2], pts[3]); break; case SkPathVerb::kClose: result.close(); break; default: SkASSERT(0); } } *path = result; } static void set_path_weight(int index, SkScalar w, SkPath* path) { SkPath result; SkPoint pts[4]; SkPath::Verb verb; SkPath::Iter iter(*path, true); int counter = -1; while ((verb = iter.next(pts)) != SkPath::kDone_Verb) { ++counter; switch (verb) { case SkPath::kMove_Verb: result.moveTo(pts[0]); break; case SkPath::kLine_Verb: result.lineTo(pts[1]); break; case SkPath::kQuad_Verb: result.quadTo(pts[1], pts[2]); break; case SkPath::kConic_Verb: result.conicTo(pts[1], pts[2], counter == index ? w : iter.conicWeight()); break; case SkPath::kCubic_Verb: result.cubicTo(pts[1], pts[2], pts[3]); break; case SkPath::kClose_Verb: result.close(); break; case SkPath::kDone_Verb: break; default: SkASSERT(0); } } *path = result; } static void set_path_verb(int index, SkPath::Verb v, SkPath* path, SkScalar w) { SkASSERT(SkPath::kLine_Verb <= v && v <= SkPath::kCubic_Verb); SkPath result; SkPoint pts[4]; SkPath::Verb verb; SkPath::Iter iter(*path, true); int counter = -1; while ((verb = iter.next(pts)) != SkPath::kDone_Verb) { SkScalar weight = verb == SkPath::kConic_Verb ? iter.conicWeight() : 1; if (++counter == index && v != verb) { SkASSERT(SkPath::kLine_Verb <= verb && verb <= SkPath::kCubic_Verb); switch (verb) { case SkPath::kLine_Verb: switch (v) { case SkPath::kConic_Verb: weight = w; [[fallthrough]]; case SkPath::kQuad_Verb: pts[2] = pts[1]; pts[1].fX = (pts[0].fX + pts[2].fX) / 2; pts[1].fY = (pts[0].fY + pts[2].fY) / 2; break; case SkPath::kCubic_Verb: pts[3] = pts[1]; pts[1].fX = (pts[0].fX * 2 + pts[3].fX) / 3; pts[1].fY = (pts[0].fY * 2 + pts[3].fY) / 3; pts[2].fX = (pts[0].fX + pts[3].fX * 2) / 3; pts[2].fY = (pts[0].fY + pts[3].fY * 2) / 3; break; default: SkASSERT(0); break; } break; case SkPath::kQuad_Verb: case SkPath::kConic_Verb: switch (v) { case SkPath::kLine_Verb: pts[1] = pts[2]; break; case SkPath::kConic_Verb: weight = w; [[fallthrough]]; case SkPath::kQuad_Verb: break; case SkPath::kCubic_Verb: { SkDQuad dQuad; dQuad.set(pts); SkDCubic dCubic = dQuad.debugToCubic(); pts[3] = pts[2]; pts[1] = dCubic[1].asSkPoint(); pts[2] = dCubic[2].asSkPoint(); } break; default: SkASSERT(0); break; } break; case SkPath::kCubic_Verb: switch (v) { case SkPath::kLine_Verb: pts[1] = pts[3]; break; case SkPath::kConic_Verb: weight = w; [[fallthrough]]; case SkPath::kQuad_Verb: { SkDCubic dCubic; dCubic.set(pts); SkDQuad dQuad = dCubic.toQuad(); pts[1] = dQuad[1].asSkPoint(); pts[2] = pts[3]; } break; default: SkASSERT(0); break; } break; default: SkASSERT(0); break; } verb = v; } switch (verb) { case SkPath::kMove_Verb: result.moveTo(pts[0]); break; case SkPath::kLine_Verb: result.lineTo(pts[1]); break; case SkPath::kQuad_Verb: result.quadTo(pts[1], pts[2]); break; case SkPath::kConic_Verb: result.conicTo(pts[1], pts[2], weight); break; case SkPath::kCubic_Verb: result.cubicTo(pts[1], pts[2], pts[3]); break; case SkPath::kClose_Verb: result.close(); break; default: SkASSERT(0); break; } } *path = result; } static void add_to_map(SkScalar coverage, int x, int y, uint8_t* distanceMap, int w, int h) { int byteCoverage = (int) (coverage * 256); if (byteCoverage < 0) { byteCoverage = 0; } else if (byteCoverage > 255) { byteCoverage = 255; } SkASSERT(x < w); SkASSERT(y < h); distanceMap[y * w + x] = std::max(distanceMap[y * w + x], (uint8_t) byteCoverage); } static void filter_coverage(const uint8_t* map, int len, uint8_t min, uint8_t max, uint8_t* filter) { for (int index = 0; index < len; ++index) { uint8_t in = map[index]; filter[index] = in < min ? 0 : max < in ? 0 : in; } } static void construct_path(SkPath& path) { path.reset(); path.moveTo(442, 101.5f); path.quadTo(413.5f, 691, 772, 514); path.lineTo(346, 721.5f); path.lineTo(154, 209); path.lineTo(442, 101.5f); path.close(); } struct ButtonPaints { static const int kMaxStateCount = 3; SkPaint fDisabled; SkPaint fStates[kMaxStateCount]; SkFont fLabelFont; ButtonPaints() { fStates[0].setAntiAlias(true); fStates[0].setStyle(SkPaint::kStroke_Style); fStates[0].setColor(0xFF3F0000); fStates[1] = fStates[0]; fStates[1].setStrokeWidth(3); fStates[2] = fStates[1]; fStates[2].setColor(0xFFcf0000); fLabelFont.setSize(25.0f); } }; struct Button { SkRect fBounds; int fStateCount; int fState; char fLabel; bool fVisible; Button(char label) { fStateCount = 2; fState = 0; fLabel = label; fVisible = false; } Button(char label, int stateCount) { SkASSERT(stateCount <= ButtonPaints::kMaxStateCount); fStateCount = stateCount; fState = 0; fLabel = label; fVisible = false; } bool contains(const SkRect& rect) { return fVisible && fBounds.contains(rect); } bool enabled() { return SkToBool(fState); } void draw(SkCanvas* canvas, const ButtonPaints& paints) { if (!fVisible) { return; } canvas->drawRect(fBounds, paints.fStates[fState]); SkTextUtils::Draw(canvas, &fLabel, 1, SkTextEncoding::kUTF8, fBounds.centerX(), fBounds.fBottom - 5, paints.fLabelFont, SkPaint(), SkTextUtils::kCenter_Align); } void toggle() { if (++fState == fStateCount) { fState = 0; } } void setEnabled(bool enabled) { fState = (int) enabled; } }; struct ControlPaints { SkPaint fOutline; SkPaint fIndicator; SkPaint fFill; SkPaint fLabel; SkPaint fValue; SkFont fLabelFont; SkFont fValueFont; ControlPaints() { fOutline.setAntiAlias(true); fOutline.setStyle(SkPaint::kStroke_Style); fIndicator = fOutline; fIndicator.setColor(SK_ColorRED); fFill.setAntiAlias(true); fFill.setColor(0x7fff0000); fLabel.setAntiAlias(true); fLabelFont.setSize(13.0f); fValue.setAntiAlias(true); fValueFont.setSize(11.0f); } }; struct UniControl { SkString fName; SkRect fBounds; SkScalar fMin; SkScalar fMax; SkScalar fValLo; SkScalar fYLo; bool fVisible; UniControl(const char* name, SkScalar min, SkScalar max) { fName = name; fValLo = fMin = min; fMax = max; fVisible = false; } virtual ~UniControl() {} bool contains(const SkRect& rect) { return fVisible && fBounds.contains(rect); } virtual void draw(SkCanvas* canvas, const ControlPaints& paints) { if (!fVisible) { return; } canvas->drawRect(fBounds, paints.fOutline); fYLo = fBounds.fTop + (fValLo - fMin) * fBounds.height() / (fMax - fMin); canvas->drawLine(fBounds.fLeft - 5, fYLo, fBounds.fRight + 5, fYLo, paints.fIndicator); SkString label; label.printf("%0.3g", fValLo); canvas->drawString(label, fBounds.fLeft + 5, fYLo - 5, paints.fValueFont, paints.fValue); canvas->drawString(fName, fBounds.fLeft, fBounds.bottom() + 11, paints.fLabelFont, paints.fLabel); } }; struct BiControl : public UniControl { SkScalar fValHi; BiControl(const char* name, SkScalar min, SkScalar max) : UniControl(name, min, max) , fValHi(fMax) { } void draw(SkCanvas* canvas, const ControlPaints& paints) override { UniControl::draw(canvas, paints); if (!fVisible || fValHi == fValLo) { return; } SkScalar yPos = fBounds.fTop + (fValHi - fMin) * fBounds.height() / (fMax - fMin); canvas->drawLine(fBounds.fLeft - 5, yPos, fBounds.fRight + 5, yPos, paints.fIndicator); SkString label; label.printf("%0.3g", fValHi); if (yPos < fYLo + 10) { yPos = fYLo + 10; } canvas->drawString(label, fBounds.fLeft + 5, yPos - 5, paints.fValueFont, paints.fValue); SkRect fill = { fBounds.fLeft, fYLo, fBounds.fRight, yPos }; canvas->drawRect(fill, paints.fFill); } }; class MyClick : public Sample::Click { public: enum ClickType { kInvalidType = -1, kPtType, kVerbType, kControlType, kPathType, } fType; enum ControlType { kInvalidControl = -1, kFirstControl, kFilterControl = kFirstControl, kResControl, kWeightControl, kWidthControl, kLastControl = kWidthControl, kFirstButton, kCubicButton = kFirstButton, kConicButton, kQuadButton, kLineButton, kLastVerbButton = kLineButton, kAddButton, kDeleteButton, kInOutButton, kFillButton, kSkeletonButton, kFilterButton, kBisectButton, kJoinButton, kLastButton = kJoinButton, kPathMove, } fControl; SkPath::Verb fVerb; SkScalar fWeight; MyClick(ClickType type, ControlType control) : fType(type) , fControl(control) , fVerb((SkPath::Verb) -1) , fWeight(1) { } MyClick(ClickType type, int index) : fType(type) , fControl((ControlType) index) , fVerb((SkPath::Verb) -1) , fWeight(1) { } MyClick(ClickType type, int index, SkPath::Verb verb, SkScalar weight) : fType(type) , fControl((ControlType) index) , fVerb(verb) , fWeight(weight) { } bool isButton() { return kFirstButton <= fControl && fControl <= kLastButton; } int ptHit() const { SkASSERT(fType == kPtType); return (int) fControl; } int verbHit() const { SkASSERT(fType == kVerbType); return (int) fControl; } }; enum { kControlCount = MyClick::kLastControl - MyClick::kFirstControl + 1, }; static struct ControlPair { UniControl* fControl; MyClick::ControlType fControlType; } kControlList[kControlCount]; enum { kButtonCount = MyClick::kLastButton - MyClick::kFirstButton + 1, kVerbCount = MyClick::kLastVerbButton - MyClick::kFirstButton + 1, }; static struct ButtonPair { Button* fButton; MyClick::ControlType fButtonType; } kButtonList[kButtonCount]; static void enable_verb_button(MyClick::ControlType type) { for (int index = 0; index < kButtonCount; ++index) { MyClick::ControlType testType = kButtonList[index].fButtonType; if (MyClick::kFirstButton <= testType && testType <= MyClick::kLastVerbButton) { Button* button = kButtonList[index].fButton; button->setEnabled(testType == type); } } } struct Stroke; struct Active { Active* fNext; Stroke* fParent; SkScalar fStart; SkScalar fEnd; void reset() { fNext = nullptr; fStart = 0; fEnd = 1; } }; struct Stroke { SkPath fPath; Active fActive; bool fInner; void reset() { fPath.reset(); fActive.reset(); } }; struct PathUndo { SkPath fPath; std::unique_ptr fNext; }; class AAGeometryView : public Sample { SkPaint fActivePaint; SkPaint fComplexPaint; SkPaint fCoveragePaint; SkFont fLegendLeftFont; SkFont fLegendRightFont; SkPaint fPointPaint; SkPaint fSkeletonPaint; SkPaint fLightSkeletonPaint; SkPath fPath; ControlPaints fControlPaints; UniControl fResControl; UniControl fWeightControl; UniControl fWidthControl; BiControl fFilterControl; ButtonPaints fButtonPaints; Button fCubicButton; Button fConicButton; Button fQuadButton; Button fLineButton; Button fAddButton; Button fDeleteButton; Button fFillButton; Button fSkeletonButton; Button fFilterButton; Button fBisectButton; Button fJoinButton; Button fInOutButton; SkTArray fStrokes; std::unique_ptr fUndo; int fActivePt; int fActiveVerb; bool fHandlePathMove; bool fShowLegend; bool fHideAll; const int kHitToleranace = 25; public: AAGeometryView() : fResControl("error", 0, 10) , fWeightControl("weight", 0, 5) , fWidthControl("width", FLT_EPSILON, 100) , fFilterControl("filter", 0, 255) , fCubicButton('C') , fConicButton('K') , fQuadButton('Q') , fLineButton('L') , fAddButton('+') , fDeleteButton('x') , fFillButton('p') , fSkeletonButton('s') , fFilterButton('f', 3) , fBisectButton('b') , fJoinButton('j') , fInOutButton('|') , fActivePt(-1) , fActiveVerb(-1) , fHandlePathMove(true) , fShowLegend(false) , fHideAll(false) { fCoveragePaint.setAntiAlias(true); fCoveragePaint.setColor(SK_ColorBLUE); SkPaint strokePaint; strokePaint.setAntiAlias(true); strokePaint.setStyle(SkPaint::kStroke_Style); fPointPaint = strokePaint; fPointPaint.setColor(0x99ee3300); fSkeletonPaint = strokePaint; fSkeletonPaint.setColor(SK_ColorRED); fLightSkeletonPaint = fSkeletonPaint; fLightSkeletonPaint.setColor(0xFFFF7f7f); fActivePaint = strokePaint; fActivePaint.setColor(0x99ee3300); fActivePaint.setStrokeWidth(5); fComplexPaint = fActivePaint; fComplexPaint.setColor(SK_ColorBLUE); fLegendLeftFont.setSize(13); fLegendRightFont = fLegendLeftFont; construct_path(fPath); fFillButton.fVisible = fSkeletonButton.fVisible = fFilterButton.fVisible = fBisectButton.fVisible = fJoinButton.fVisible = fInOutButton.fVisible = true; fSkeletonButton.setEnabled(true); fInOutButton.setEnabled(true); fJoinButton.setEnabled(true); fFilterControl.fValLo = 120; fFilterControl.fValHi = 141; fFilterControl.fVisible = fFilterButton.fState == 2; fResControl.fValLo = 5; fResControl.fVisible = true; fWidthControl.fValLo = 50; fWidthControl.fVisible = true; init_controlList(); init_buttonList(); } ~AAGeometryView() override { // Free linked list without deep recursion. std::unique_ptr undo = std::move(fUndo); while (undo) { undo = std::move(undo->fNext); } } bool constructPath() { construct_path(fPath); return true; } void savePath(skui::InputState state) { if (state != skui::InputState::kDown) { return; } if (fUndo && fUndo->fPath == fPath) { return; } std::unique_ptr undo(new PathUndo); undo->fPath = fPath; undo->fNext = std::move(fUndo); fUndo = std::move(undo); } bool undo() { if (!fUndo) { return false; } fPath = std::move(fUndo->fPath); fUndo = std::move(fUndo->fNext); validatePath(); return true; } void validatePath() {} void set_controlList(int index, UniControl* control, MyClick::ControlType type) { kControlList[index].fControl = control; kControlList[index].fControlType = type; } #define SET_CONTROL(Name) set_controlList(index++, &f##Name##Control, \ MyClick::k##Name##Control) bool hideAll() { fHideAll ^= true; return true; } void init_controlList() { int index = 0; SET_CONTROL(Width); SET_CONTROL(Res); SET_CONTROL(Filter); SET_CONTROL(Weight); } #undef SET_CONTROL void set_buttonList(int index, Button* button, MyClick::ControlType type) { kButtonList[index].fButton = button; kButtonList[index].fButtonType = type; } #define SET_BUTTON(Name) set_buttonList(index++, &f##Name##Button, \ MyClick::k##Name##Button) void init_buttonList() { int index = 0; SET_BUTTON(Fill); SET_BUTTON(Skeleton); SET_BUTTON(Filter); SET_BUTTON(Bisect); SET_BUTTON(Join); SET_BUTTON(InOut); SET_BUTTON(Cubic); SET_BUTTON(Conic); SET_BUTTON(Quad); SET_BUTTON(Line); SET_BUTTON(Add); SET_BUTTON(Delete); } #undef SET_BUTTON SkString name() override { return SkString("AAGeometry"); } bool onChar(SkUnichar) override; void onSizeChange() override { setControlButtonsPos(); this->INHERITED::onSizeChange(); } bool pathDump() { fPath.dump(); return true; } bool scaleDown() { SkMatrix matrix; SkRect bounds = fPath.getBounds(); matrix.setScale(1.f / 1.5f, 1.f / 1.5f, bounds.centerX(), bounds.centerY()); fPath.transform(matrix); validatePath(); return true; } bool scaleToFit() { SkMatrix matrix; SkRect bounds = fPath.getBounds(); SkScalar scale = std::min(this->width() / bounds.width(), this->height() / bounds.height()) * 0.8f; matrix.setScale(scale, scale, bounds.centerX(), bounds.centerY()); fPath.transform(matrix); bounds = fPath.getBounds(); SkScalar offsetX = (this->width() - bounds.width()) / 2 - bounds.fLeft; SkScalar offsetY = (this->height() - bounds.height()) / 2 - bounds.fTop; fPath.offset(offsetX, offsetY); validatePath(); return true; } bool scaleUp() { SkMatrix matrix; SkRect bounds = fPath.getBounds(); matrix.setScale(1.5f, 1.5f, bounds.centerX(), bounds.centerY()); fPath.transform(matrix); validatePath(); return true; } void setControlButtonsPos() { SkScalar widthOffset = this->width() - 100; for (int index = 0; index < kControlCount; ++index) { if (kControlList[index].fControl->fVisible) { kControlList[index].fControl->fBounds.setXYWH(widthOffset, 30, 30, 400); widthOffset -= 50; } } SkScalar buttonOffset = 0; for (int index = 0; index < kButtonCount; ++index) { kButtonList[index].fButton->fBounds.setXYWH(this->width() - 50, buttonOffset += 50, 30, 30); } } bool showLegend() { fShowLegend ^= true; return true; } void draw_bisect(SkCanvas* canvas, const SkVector& lastVector, const SkVector& vector, const SkPoint& pt) { SkVector lastV = lastVector; SkScalar lastLen = lastVector.length(); SkVector nextV = vector; SkScalar nextLen = vector.length(); if (lastLen < nextLen) { lastV.setLength(nextLen); } else { nextV.setLength(lastLen); } SkVector bisect = { (lastV.fX + nextV.fX) / 2, (lastV.fY + nextV.fY) / 2 }; bisect.setLength(fWidthControl.fValLo * 2); if (fBisectButton.enabled()) { canvas->drawLine(pt, pt + bisect, fSkeletonPaint); } lastV.setLength(fWidthControl.fValLo); if (fBisectButton.enabled()) { canvas->drawLine(pt, {pt.fX - lastV.fY, pt.fY + lastV.fX}, fSkeletonPaint); } nextV.setLength(fWidthControl.fValLo); if (fBisectButton.enabled()) { canvas->drawLine(pt, {pt.fX + nextV.fY, pt.fY - nextV.fX}, fSkeletonPaint); } if (fJoinButton.enabled()) { SkScalar r = fWidthControl.fValLo; SkRect oval = { pt.fX - r, pt.fY - r, pt.fX + r, pt.fY + r}; SkScalar startAngle = SkScalarATan2(lastV.fX, -lastV.fY) * 180.f / SK_ScalarPI; SkScalar endAngle = SkScalarATan2(-nextV.fX, nextV.fY) * 180.f / SK_ScalarPI; if (endAngle > startAngle) { canvas->drawArc(oval, startAngle, endAngle - startAngle, false, fSkeletonPaint); } else { canvas->drawArc(oval, startAngle, 360 - (startAngle - endAngle), false, fSkeletonPaint); } } } void draw_bisects(SkCanvas* canvas, bool activeOnly) { SkVector firstVector, lastVector, nextLast, vector; SkPoint pts[4]; SkPoint firstPt = { 0, 0 }; // init to avoid warning; SkPath::Verb verb; SkPath::Iter iter(fPath, true); bool foundFirst = false; int counter = -1; while ((verb = iter.next(pts)) != SkPath::kDone_Verb) { ++counter; if (activeOnly && counter != fActiveVerb && counter - 1 != fActiveVerb && counter + 1 != fActiveVerb && (fActiveVerb != 1 || counter != fPath.countVerbs())) { continue; } switch (verb) { case SkPath::kLine_Verb: nextLast = pts[0] - pts[1]; vector = pts[1] - pts[0]; break; case SkPath::kQuad_Verb: { nextLast = pts[1] - pts[2]; if (SkScalarNearlyZero(nextLast.length())) { nextLast = pts[0] - pts[2]; } vector = pts[1] - pts[0]; if (SkScalarNearlyZero(vector.length())) { vector = pts[2] - pts[0]; } if (!fBisectButton.enabled()) { break; } SkScalar t = SkFindQuadMaxCurvature(pts); if (0 < t && t < 1) { SkPoint maxPt = SkEvalQuadAt(pts, t); SkVector tangent = SkEvalQuadTangentAt(pts, t); tangent.setLength(fWidthControl.fValLo * 2); canvas->drawLine(maxPt, {maxPt.fX + tangent.fY, maxPt.fY - tangent.fX}, fSkeletonPaint); } } break; case SkPath::kConic_Verb: nextLast = pts[1] - pts[2]; if (SkScalarNearlyZero(nextLast.length())) { nextLast = pts[0] - pts[2]; } vector = pts[1] - pts[0]; if (SkScalarNearlyZero(vector.length())) { vector = pts[2] - pts[0]; } if (!fBisectButton.enabled()) { break; } // FIXME : need max curvature or equivalent here break; case SkPath::kCubic_Verb: { nextLast = pts[2] - pts[3]; if (SkScalarNearlyZero(nextLast.length())) { nextLast = pts[1] - pts[3]; if (SkScalarNearlyZero(nextLast.length())) { nextLast = pts[0] - pts[3]; } } vector = pts[0] - pts[1]; if (SkScalarNearlyZero(vector.length())) { vector = pts[0] - pts[2]; if (SkScalarNearlyZero(vector.length())) { vector = pts[0] - pts[3]; } } if (!fBisectButton.enabled()) { break; } SkScalar tMax[2]; int tMaxCount = SkFindCubicMaxCurvature(pts, tMax); for (int tIndex = 0; tIndex < tMaxCount; ++tIndex) { if (0 >= tMax[tIndex] || tMax[tIndex] >= 1) { continue; } SkPoint maxPt; SkVector tangent; SkEvalCubicAt(pts, tMax[tIndex], &maxPt, &tangent, nullptr); tangent.setLength(fWidthControl.fValLo * 2); canvas->drawLine(maxPt, {maxPt.fX + tangent.fY, maxPt.fY - tangent.fX}, fSkeletonPaint); } } break; case SkPath::kClose_Verb: if (foundFirst) { draw_bisect(canvas, lastVector, firstVector, firstPt); foundFirst = false; } break; default: break; } if (SkPath::kLine_Verb <= verb && verb <= SkPath::kCubic_Verb) { if (!foundFirst) { firstPt = pts[0]; firstVector = vector; foundFirst = true; } else { draw_bisect(canvas, lastVector, vector, pts[0]); } lastVector = nextLast; } } } void draw_legend(SkCanvas* canvas); void draw_segment(SkCanvas* canvas) { SkPoint pts[4]; SkPath::Verb verb; SkPath::Iter iter(fPath, true); int counter = -1; while ((verb = iter.next(pts)) != SkPath::kDone_Verb) { if (++counter < fActiveVerb) { continue; } switch (verb) { case SkPath::kLine_Verb: canvas->drawPoints(SkCanvas::kLines_PointMode, 2, pts, fActivePaint); draw_points(canvas, pts, 2); break; case SkPath::kQuad_Verb: { SkPath qPath; qPath.moveTo(pts[0]); qPath.quadTo(pts[1], pts[2]); canvas->drawPath(qPath, fActivePaint); draw_points(canvas, pts, 3); } break; case SkPath::kConic_Verb: { SkPath conicPath; conicPath.moveTo(pts[0]); conicPath.conicTo(pts[1], pts[2], iter.conicWeight()); canvas->drawPath(conicPath, fActivePaint); draw_points(canvas, pts, 3); } break; case SkPath::kCubic_Verb: { SkScalar loopT[3]; int complex = SkDCubic::ComplexBreak(pts, loopT); SkPath cPath; cPath.moveTo(pts[0]); cPath.cubicTo(pts[1], pts[2], pts[3]); canvas->drawPath(cPath, complex ? fComplexPaint : fActivePaint); draw_points(canvas, pts, 4); } break; default: break; } return; } } void draw_points(SkCanvas* canvas, SkPoint* points, int count) { for (int index = 0; index < count; ++index) { canvas->drawCircle(points[index].fX, points[index].fY, 10, fPointPaint); } } int hittest_verb(SkPoint pt, SkPath::Verb* verbPtr, SkScalar* weight) { SkIntersections i; SkDLine hHit = {{{pt.fX - kHitToleranace, pt.fY }, {pt.fX + kHitToleranace, pt.fY}}}; SkDLine vHit = {{{pt.fX, pt.fY - kHitToleranace }, {pt.fX, pt.fY + kHitToleranace}}}; SkPoint pts[4]; SkPath::Verb verb; SkPath::Iter iter(fPath, true); int counter = -1; while ((verb = iter.next(pts)) != SkPath::kDone_Verb) { ++counter; switch (verb) { case SkPath::kLine_Verb: { SkDLine line; line.set(pts); if (i.intersect(line, hHit) || i.intersect(line, vHit)) { *verbPtr = verb; *weight = 1; return counter; } } break; case SkPath::kQuad_Verb: { SkDQuad quad; quad.set(pts); if (i.intersect(quad, hHit) || i.intersect(quad, vHit)) { *verbPtr = verb; *weight = 1; return counter; } } break; case SkPath::kConic_Verb: { SkDConic conic; SkScalar w = iter.conicWeight(); conic.set(pts, w); if (i.intersect(conic, hHit) || i.intersect(conic, vHit)) { *verbPtr = verb; *weight = w; return counter; } } break; case SkPath::kCubic_Verb: { SkDCubic cubic; cubic.set(pts); if (i.intersect(cubic, hHit) || i.intersect(cubic, vHit)) { *verbPtr = verb; *weight = 1; return counter; } } break; default: break; } } return -1; } SkScalar pt_to_line(SkPoint s, SkPoint e, int x, int y) { SkScalar radius = fWidthControl.fValLo; SkVector adjOpp = e - s; SkScalar lenSq = SkPointPriv::LengthSqd(adjOpp); SkPoint rotated = { (y - s.fY) * adjOpp.fY + (x - s.fX) * adjOpp.fX, (y - s.fY) * adjOpp.fX - (x - s.fX) * adjOpp.fY, }; if (rotated.fX < 0 || rotated.fX > lenSq) { return -radius; } rotated.fY /= SkScalarSqrt(lenSq); return std::max(-radius, std::min(radius, rotated.fY)); } // given a line, compute the interior and exterior gradient coverage bool coverage(SkPoint s, SkPoint e, uint8_t* distanceMap, int w, int h) { SkScalar radius = fWidthControl.fValLo; int minX = std::max(0, (int) (std::min(s.fX, e.fX) - radius)); int minY = std::max(0, (int) (std::min(s.fY, e.fY) - radius)); int maxX = std::min(w, (int) (std::max(s.fX, e.fX) + radius) + 1); int maxY = std::min(h, (int) (std::max(s.fY, e.fY) + radius) + 1); for (int y = minY; y < maxY; ++y) { for (int x = minX; x < maxX; ++x) { SkScalar ptToLineDist = pt_to_line(s, e, x, y); if (ptToLineDist > -radius && ptToLineDist < radius) { SkScalar coverage = ptToLineDist / radius; add_to_map(1 - SkScalarAbs(coverage), x, y, distanceMap, w, h); } SkVector ptToS = { x - s.fX, y - s.fY }; SkScalar dist = ptToS.length(); if (dist < radius) { SkScalar coverage = dist / radius; add_to_map(1 - SkScalarAbs(coverage), x, y, distanceMap, w, h); } SkVector ptToE = { x - e.fX, y - e.fY }; dist = ptToE.length(); if (dist < radius) { SkScalar coverage = dist / radius; add_to_map(1 - SkScalarAbs(coverage), x, y, distanceMap, w, h); } } } return true; } void quad_coverage(SkPoint pts[3], uint8_t* distanceMap, int w, int h) { SkScalar dist = SkPoint::Distance(pts[0], pts[2]); if (dist < gCurveDistance) { (void) coverage(pts[0], pts[2], distanceMap, w, h); return; } SkPoint split[5]; SkChopQuadAt(pts, split, 0.5f); quad_coverage(&split[0], distanceMap, w, h); quad_coverage(&split[2], distanceMap, w, h); } void conic_coverage(SkPoint pts[3], SkScalar weight, uint8_t* distanceMap, int w, int h) { SkScalar dist = SkPoint::Distance(pts[0], pts[2]); if (dist < gCurveDistance) { (void) coverage(pts[0], pts[2], distanceMap, w, h); return; } SkConic split[2]; SkConic conic; conic.set(pts, weight); if (conic.chopAt(0.5f, split)) { conic_coverage(split[0].fPts, split[0].fW, distanceMap, w, h); conic_coverage(split[1].fPts, split[1].fW, distanceMap, w, h); } } void cubic_coverage(SkPoint pts[4], uint8_t* distanceMap, int w, int h) { SkScalar dist = SkPoint::Distance(pts[0], pts[3]); if (dist < gCurveDistance) { (void) coverage(pts[0], pts[3], distanceMap, w, h); return; } SkPoint split[7]; SkChopCubicAt(pts, split, 0.5f); cubic_coverage(&split[0], distanceMap, w, h); cubic_coverage(&split[3], distanceMap, w, h); } void path_coverage(const SkPath& path, uint8_t* distanceMap, int w, int h) { memset(distanceMap, 0, sizeof(distanceMap[0]) * w * h); SkPoint pts[4]; SkPath::Verb verb; SkPath::Iter iter(path, true); while ((verb = iter.next(pts)) != SkPath::kDone_Verb) { switch (verb) { case SkPath::kLine_Verb: (void) coverage(pts[0], pts[1], distanceMap, w, h); break; case SkPath::kQuad_Verb: quad_coverage(pts, distanceMap, w, h); break; case SkPath::kConic_Verb: conic_coverage(pts, iter.conicWeight(), distanceMap, w, h); break; case SkPath::kCubic_Verb: cubic_coverage(pts, distanceMap, w, h); break; default: break; } } } static uint8_t* set_up_dist_map(const SkImageInfo& imageInfo, SkBitmap* distMap) { distMap->setInfo(imageInfo); SkAssertResult(distMap->tryAllocPixels()); SkASSERT((int) distMap->rowBytes() == imageInfo.width()); return distMap->getAddr8(0, 0); } void path_stroke(int index, SkPath* inner, SkPath* outer) { #if 0 SkPathStroker stroker(fPath, fWidthControl.fValLo, 0, SkPaint::kRound_Cap, SkPaint::kRound_Join, fResControl.fValLo); SkPoint pts[4], firstPt, lastPt; SkPath::Verb verb; SkPath::Iter iter(fPath, true); int counter = -1; while ((verb = iter.next(pts)) != SkPath::kDone_Verb) { ++counter; switch (verb) { case SkPath::kMove_Verb: firstPt = pts[0]; break; case SkPath::kLine_Verb: if (counter == index) { stroker.moveTo(pts[0]); stroker.lineTo(pts[1]); goto done; } lastPt = pts[1]; break; case SkPath::kQuad_Verb: if (counter == index) { stroker.moveTo(pts[0]); stroker.quadTo(pts[1], pts[2]); goto done; } lastPt = pts[2]; break; case SkPath::kConic_Verb: if (counter == index) { stroker.moveTo(pts[0]); stroker.conicTo(pts[1], pts[2], iter.conicWeight()); goto done; } lastPt = pts[2]; break; case SkPath::kCubic_Verb: if (counter == index) { stroker.moveTo(pts[0]); stroker.cubicTo(pts[1], pts[2], pts[3]); goto done; } lastPt = pts[3]; break; case SkPath::kClose_Verb: if (counter == index) { stroker.moveTo(lastPt); stroker.lineTo(firstPt); goto done; } break; case SkPath::kDone_Verb: break; default: SkASSERT(0); } } done: *inner = stroker.fInner; *outer = stroker.fOuter; #endif } void draw_stroke(SkCanvas* canvas, int active) { SkPath inner, outer; path_stroke(active, &inner, &outer); canvas->drawPath(inner, fSkeletonPaint); canvas->drawPath(outer, fSkeletonPaint); } void gather_strokes() { fStrokes.reset(); for (int index = 0; index < fPath.countVerbs(); ++index) { Stroke& inner = fStrokes.push_back(); inner.reset(); inner.fInner = true; Stroke& outer = fStrokes.push_back(); outer.reset(); outer.fInner = false; path_stroke(index, &inner.fPath, &outer.fPath); } } void trim_strokes() { // eliminate self-itersecting loops // trim outside edges gather_strokes(); for (int index = 0; index < fStrokes.count(); ++index) { SkPath& outPath = fStrokes[index].fPath; for (int inner = 0; inner < fStrokes.count(); ++inner) { if (index == inner) { continue; } SkPath& inPath = fStrokes[inner].fPath; if (!outPath.getBounds().intersects(inPath.getBounds())) { continue; } } } } void onDrawContent(SkCanvas* canvas) override { #if 0 SkDEBUGCODE(SkDebugStrokeGlobals debugGlobals); SkOpAA aaResult(fPath, fWidthControl.fValLo, fResControl.fValLo SkDEBUGPARAMS(&debugGlobals)); #endif SkPath strokePath; // aaResult.simplify(&strokePath); canvas->drawPath(strokePath, fSkeletonPaint); SkRect bounds = fPath.getBounds(); SkScalar radius = fWidthControl.fValLo; int w = (int) (bounds.fRight + radius + 1); int h = (int) (bounds.fBottom + radius + 1); SkImageInfo imageInfo = SkImageInfo::MakeA8(w, h); SkBitmap distMap; uint8_t* distanceMap = set_up_dist_map(imageInfo, &distMap); path_coverage(fPath, distanceMap, w, h); if (fFillButton.enabled()) { canvas->drawPath(fPath, fCoveragePaint); } if (fFilterButton.fState == 2 && (0 < fFilterControl.fValLo || fFilterControl.fValHi < 255)) { SkBitmap filteredMap; uint8_t* filtered = set_up_dist_map(imageInfo, &filteredMap); filter_coverage(distanceMap, sizeof(uint8_t) * w * h, (uint8_t) fFilterControl.fValLo, (uint8_t) fFilterControl.fValHi, filtered); canvas->drawBitmap(filteredMap, 0, 0, &fCoveragePaint); } else if (fFilterButton.enabled()) { canvas->drawBitmap(distMap, 0, 0, &fCoveragePaint); } if (fSkeletonButton.enabled()) { canvas->drawPath(fPath, fActiveVerb >= 0 ? fLightSkeletonPaint : fSkeletonPaint); } if (fActiveVerb >= 0) { draw_segment(canvas); } if (fBisectButton.enabled() || fJoinButton.enabled()) { draw_bisects(canvas, fActiveVerb >= 0); } if (fInOutButton.enabled()) { if (fActiveVerb >= 0) { draw_stroke(canvas, fActiveVerb); } else { for (int index = 0; index < fPath.countVerbs(); ++index) { draw_stroke(canvas, index); } } } if (fHideAll) { return; } for (int index = 0; index < kControlCount; ++index) { kControlList[index].fControl->draw(canvas, fControlPaints); } for (int index = 0; index < kButtonCount; ++index) { kButtonList[index].fButton->draw(canvas, fButtonPaints); } if (fShowLegend) { draw_legend(canvas); } #if 0 SkPaint paint; paint.setARGB(255, 34, 31, 31); paint.setAntiAlias(true); SkPath path; path.moveTo(18,439); path.lineTo(414,439); path.lineTo(414,702); path.lineTo(18,702); path.lineTo(18,439); path.moveTo(19,701); path.lineTo(413,701); path.lineTo(413,440); path.lineTo(19,440); path.lineTo(19,701); path.close(); canvas->drawPath(path, paint); canvas->scale(1.0f, -1.0f); canvas->translate(0.0f, -800.0f); canvas->drawPath(path, paint); #endif } int hittest_pt(SkPoint pt) { for (int index = 0; index < fPath.countPoints(); ++index) { if (SkPoint::Distance(fPath.getPoint(index), pt) <= kHitToleranace * 2) { return index; } } return -1; } Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey modi) override { SkPoint pt = {x, y}; int ptHit = hittest_pt(pt); if (ptHit >= 0) { return new MyClick(MyClick::kPtType, ptHit); } SkPath::Verb verb; SkScalar weight; int verbHit = hittest_verb(pt, &verb, &weight); if (verbHit >= 0) { return new MyClick(MyClick::kVerbType, verbHit, verb, weight); } if (!fHideAll) { const SkRect& rectPt = SkRect::MakeXYWH(x, y, 1, 1); for (int index = 0; index < kControlCount; ++index) { if (kControlList[index].fControl->contains(rectPt)) { return new MyClick(MyClick::kControlType, kControlList[index].fControlType); } } for (int index = 0; index < kButtonCount; ++index) { if (kButtonList[index].fButton->contains(rectPt)) { return new MyClick(MyClick::kControlType, kButtonList[index].fButtonType); } } } fLineButton.fVisible = fQuadButton.fVisible = fConicButton.fVisible = fCubicButton.fVisible = fWeightControl.fVisible = fAddButton.fVisible = fDeleteButton.fVisible = false; fActiveVerb = -1; fActivePt = -1; if (fHandlePathMove) { return new MyClick(MyClick::kPathType, MyClick::kPathMove); } return nullptr; } static SkScalar MapScreenYtoValue(int y, const UniControl& control) { return std::min(1.f, std::max(0.f, SkIntToScalar(y) - control.fBounds.fTop) / control.fBounds.height()) * (control.fMax - control.fMin) + control.fMin; } bool onClick(Click* click) override { MyClick* myClick = (MyClick*) click; switch (myClick->fType) { case MyClick::kPtType: { savePath(click->fState); fActivePt = myClick->ptHit(); SkPoint pt = fPath.getPoint((int) myClick->fControl); pt.offset(SkIntToScalar(click->fCurr.fX - click->fPrev.fX), SkIntToScalar(click->fCurr.fY - click->fPrev.fY)); SkPathPriv::UpdatePathPoint(&fPath, fActivePt, pt); validatePath(); return true; } case MyClick::kPathType: savePath(click->fState); fPath.offset(SkIntToScalar(click->fCurr.fX - click->fPrev.fX), SkIntToScalar(click->fCurr.fY - click->fPrev.fY)); validatePath(); return true; case MyClick::kVerbType: { fActiveVerb = myClick->verbHit(); fLineButton.fVisible = fQuadButton.fVisible = fConicButton.fVisible = fCubicButton.fVisible = fAddButton.fVisible = fDeleteButton.fVisible = true; fLineButton.setEnabled(myClick->fVerb == SkPath::kLine_Verb); fQuadButton.setEnabled(myClick->fVerb == SkPath::kQuad_Verb); fConicButton.setEnabled(myClick->fVerb == SkPath::kConic_Verb); fCubicButton.setEnabled(myClick->fVerb == SkPath::kCubic_Verb); fWeightControl.fValLo = myClick->fWeight; fWeightControl.fVisible = myClick->fVerb == SkPath::kConic_Verb; } break; case MyClick::kControlType: { if (click->fState != skui::InputState::kDown && myClick->isButton()) { return true; } switch (myClick->fControl) { case MyClick::kFilterControl: { SkScalar val = MapScreenYtoValue(click->fCurr.fY, fFilterControl); if (val - fFilterControl.fValLo < fFilterControl.fValHi - val) { fFilterControl.fValLo = std::max(0.f, val); } else { fFilterControl.fValHi = std::min(255.f, val); } } break; case MyClick::kResControl: fResControl.fValLo = MapScreenYtoValue(click->fCurr.fY, fResControl); break; case MyClick::kWeightControl: { savePath(click->fState); SkScalar w = MapScreenYtoValue(click->fCurr.fY, fWeightControl); set_path_weight(fActiveVerb, w, &fPath); validatePath(); fWeightControl.fValLo = w; } break; case MyClick::kWidthControl: fWidthControl.fValLo = MapScreenYtoValue(click->fCurr.fY, fWidthControl); break; case MyClick::kLineButton: savePath(click->fState); enable_verb_button(myClick->fControl); fWeightControl.fVisible = false; set_path_verb(fActiveVerb, SkPath::kLine_Verb, &fPath, 1); validatePath(); break; case MyClick::kQuadButton: savePath(click->fState); enable_verb_button(myClick->fControl); fWeightControl.fVisible = false; set_path_verb(fActiveVerb, SkPath::kQuad_Verb, &fPath, 1); validatePath(); break; case MyClick::kConicButton: { savePath(click->fState); enable_verb_button(myClick->fControl); fWeightControl.fVisible = true; const SkScalar defaultConicWeight = 1.f / SkScalarSqrt(2); set_path_verb(fActiveVerb, SkPath::kConic_Verb, &fPath, defaultConicWeight); validatePath(); fWeightControl.fValLo = get_path_weight(fActiveVerb, fPath); } break; case MyClick::kCubicButton: savePath(click->fState); enable_verb_button(myClick->fControl); fWeightControl.fVisible = false; set_path_verb(fActiveVerb, SkPath::kCubic_Verb, &fPath, 1); validatePath(); break; case MyClick::kAddButton: savePath(click->fState); add_path_segment(fActiveVerb, &fPath); validatePath(); if (fWeightControl.fVisible) { fWeightControl.fValLo = get_path_weight(fActiveVerb, fPath); } break; case MyClick::kDeleteButton: savePath(click->fState); delete_path_segment(fActiveVerb, &fPath); validatePath(); break; case MyClick::kFillButton: fFillButton.toggle(); break; case MyClick::kSkeletonButton: fSkeletonButton.toggle(); break; case MyClick::kFilterButton: fFilterButton.toggle(); fFilterControl.fVisible = fFilterButton.fState == 2; break; case MyClick::kBisectButton: fBisectButton.toggle(); break; case MyClick::kJoinButton: fJoinButton.toggle(); break; case MyClick::kInOutButton: fInOutButton.toggle(); break; default: SkASSERT(0); break; } } break; default: SkASSERT(0); break; } setControlButtonsPos(); return true; } private: using INHERITED = Sample; }; static struct KeyCommand { char fKey; char fAlternate; const char* fDescriptionL; const char* fDescriptionR; bool (AAGeometryView::*fFunction)(); } kKeyCommandList[] = { { ' ', 0, "space", "center path", &AAGeometryView::scaleToFit }, { '-', 0, "-", "zoom out", &AAGeometryView::scaleDown }, { '+', '=', "+/=", "zoom in", &AAGeometryView::scaleUp }, { 'D', 0, "D", "dump to console", &AAGeometryView::pathDump }, { 'H', 0, "H", "hide controls", &AAGeometryView::hideAll }, { 'R', 0, "R", "reset path", &AAGeometryView::constructPath }, { 'Z', 0, "Z", "undo", &AAGeometryView::undo }, { '?', 0, "?", "show legend", &AAGeometryView::showLegend }, }; const int kKeyCommandCount = (int) SK_ARRAY_COUNT(kKeyCommandList); void AAGeometryView::draw_legend(SkCanvas* canvas) { SkScalar bottomOffset = this->height() - 10; for (int index = kKeyCommandCount - 1; index >= 0; --index) { bottomOffset -= 15; SkTextUtils::DrawString(canvas, kKeyCommandList[index].fDescriptionL, this->width() - 160, bottomOffset, fLegendLeftFont, SkPaint()); SkTextUtils::DrawString(canvas, kKeyCommandList[index].fDescriptionR, this->width() - 20, bottomOffset, fLegendRightFont, SkPaint(), SkTextUtils::kRight_Align); } } bool AAGeometryView::onChar(SkUnichar uni) { for (int index = 0; index < kButtonCount; ++index) { Button* button = kButtonList[index].fButton; if (button->fVisible && uni == button->fLabel) { MyClick click(MyClick::kControlType, kButtonList[index].fButtonType); click.fState = skui::InputState::kDown; (void) this->onClick(&click); return true; } } for (int index = 0; index < kKeyCommandCount; ++index) { KeyCommand& keyCommand = kKeyCommandList[index]; if (uni == keyCommand.fKey || uni == keyCommand.fAlternate) { return (this->*keyCommand.fFunction)(); } } if (('A' <= uni && uni <= 'Z') || ('a' <= uni && uni <= 'z')) { for (int index = 0; index < kButtonCount; ++index) { Button* button = kButtonList[index].fButton; if (button->fVisible && (uni & ~0x20) == (button->fLabel & ~0x20)) { MyClick click(MyClick::kControlType, kButtonList[index].fButtonType); click.fState = skui::InputState::kDown; (void) this->onClick(&click); return true; } } } return false; } DEF_SAMPLE( return new AAGeometryView; )