Create Sample that combines combose shader and coons patch
BUG=skia: Review URL: https://codereview.chromium.org/1417123004
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@ -31,6 +31,7 @@
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'../samplecode/ClockFaceView.cpp',
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'../samplecode/OverView.cpp',
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'../samplecode/OverView.h',
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'../samplecode/PerlinPatch.cpp',
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'../samplecode/Sample2PtRadial.cpp',
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'../samplecode/SampleAAClip.cpp',
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'../samplecode/SampleAARects.cpp',
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208
samplecode/PerlinPatch.cpp
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208
samplecode/PerlinPatch.cpp
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/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SampleCode.h"
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#include "SkAnimTimer.h"
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#include "SkCanvas.h"
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#include "SkGradientShader.h"
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#include "SkPatchUtils.h"
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#include "SkPerlinNoiseShader.h"
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#include "SkComposeShader.h"
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static void draw_control_points(SkCanvas* canvas, const SkPoint cubics[12]) {
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//draw control points
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SkPaint paint;
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SkPoint bottom[SkPatchUtils::kNumPtsCubic];
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SkPatchUtils::getBottomCubic(cubics, bottom);
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SkPoint top[SkPatchUtils::kNumPtsCubic];
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SkPatchUtils::getTopCubic(cubics, top);
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SkPoint left[SkPatchUtils::kNumPtsCubic];
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SkPatchUtils::getLeftCubic(cubics, left);
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SkPoint right[SkPatchUtils::kNumPtsCubic];
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SkPatchUtils::getRightCubic(cubics, right);
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paint.setColor(SK_ColorBLACK);
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paint.setStrokeWidth(0.5f);
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SkPoint corners[4] = { bottom[0], bottom[3], top[0], top[3] };
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canvas->drawPoints(SkCanvas::kLines_PointMode, 4, bottom, paint);
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canvas->drawPoints(SkCanvas::kLines_PointMode, 2, bottom + 1, paint);
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canvas->drawPoints(SkCanvas::kLines_PointMode, 4, top, paint);
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canvas->drawPoints(SkCanvas::kLines_PointMode, 4, left, paint);
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canvas->drawPoints(SkCanvas::kLines_PointMode, 4, right, paint);
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canvas->drawPoints(SkCanvas::kLines_PointMode, 2, top + 1, paint);
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canvas->drawPoints(SkCanvas::kLines_PointMode, 2, left + 1, paint);
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canvas->drawPoints(SkCanvas::kLines_PointMode, 2, right + 1, paint);
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paint.setStrokeWidth(2);
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paint.setColor(SK_ColorRED);
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canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, corners, paint);
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paint.setColor(SK_ColorBLUE);
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canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, bottom + 1, paint);
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paint.setColor(SK_ColorCYAN);
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canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, top + 1, paint);
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paint.setColor(SK_ColorYELLOW);
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canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, left + 1, paint);
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paint.setColor(SK_ColorGREEN);
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canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, right + 1, paint);
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}
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// These are actually half the total width and hieghts
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const SkScalar TexWidth = 100.0f;
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const SkScalar TexHeight = 100.0f;
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class PerlinPatchView : public SampleView {
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SkShader* fShader0;
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SkShader* fShader1;
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SkShader* fShaderCompose;
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SkScalar fXFreq;
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SkScalar fYFreq;
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SkScalar fSeed;
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SkPoint fPts[SkPatchUtils::kNumCtrlPts];
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SkScalar fTexX;
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SkScalar fTexY;
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SkScalar fTexScale;
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SkMatrix fInvMatrix;
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public:
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PerlinPatchView() : fXFreq(0.025f), fYFreq(0.025f), fSeed(0.0f),
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fTexX(100.0), fTexY(50.0), fTexScale(1.0f) {
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// The order of the colors and points is clockwise starting at upper-left corner.
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//top points
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fPts[0].set(100, 100);
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fPts[1].set(150, 50);
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fPts[2].set(250, 150);
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fPts[3].set(300, 100);
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//right points
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fPts[4].set(275, 150);
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fPts[5].set(350, 250);
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//bottom points
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fPts[6].set(300, 300);
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fPts[7].set(250, 250);
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//left points
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fPts[8].set(150, 350);
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fPts[9].set(100, 300);
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fPts[10].set(50, 250);
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fPts[11].set(150, 150);
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const SkColor colors[SkPatchUtils::kNumCorners] = {
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SK_ColorBLUE, SK_ColorYELLOW
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};
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fShader0 = SkGradientShader::CreateRadial(SkPoint::Make(128.0f, 128.0f),
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180.0f,
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colors,
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NULL,
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2,
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SkShader::kMirror_TileMode,
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0,
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NULL);
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fShader1 = SkPerlinNoiseShader::CreateTurbulence(fXFreq, fYFreq, 2, fSeed, NULL);
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fShaderCompose = new SkComposeShader(fShader0, fShader1);
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}
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virtual ~PerlinPatchView() {
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SkSafeUnref(fShader0);
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SkSafeUnref(fShader1);
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SkSafeUnref(fShaderCompose);
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}
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protected:
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// overrides from SkEventSink
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bool onQuery(SkEvent* evt) override {
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if (SampleCode::TitleQ(*evt)) {
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SampleCode::TitleR(evt, "PerlinPatch");
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return true;
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}
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return this->INHERITED::onQuery(evt);
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}
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bool onAnimate(const SkAnimTimer& timer) override {
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return true;
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}
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void onDrawContent(SkCanvas* canvas) override {
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if (!canvas->getTotalMatrix().invert(&fInvMatrix)) {
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return;
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}
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SkPaint paint;
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SkScalar texWidth = fTexScale * TexWidth;
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SkScalar texHeight = fTexScale * TexHeight;
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const SkPoint texCoords[SkPatchUtils::kNumCorners] = {
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{ fTexX - texWidth, fTexY - texHeight},
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{ fTexX + texWidth, fTexY - texHeight},
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{ fTexX + texWidth, fTexY + texHeight},
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{ fTexX - texWidth, fTexY + texHeight}}
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;
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SkAutoTUnref<SkXfermode> xfer(SkXfermode::Create(SkXfermode::kSrc_Mode));
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paint.setShader(fShaderCompose);
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canvas->drawPatch(fPts, nullptr, texCoords, xfer, paint);
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draw_control_points(canvas, fPts);
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}
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class PtClick : public Click {
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public:
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int fIndex;
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PtClick(SkView* view, int index) : Click(view), fIndex(index) {}
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};
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static bool hittest(const SkPoint& pt, SkScalar x, SkScalar y) {
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return SkPoint::Length(pt.fX - x, pt.fY - y) < SkIntToScalar(5);
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}
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SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override {
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// holding down shift
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if (1 == modi) {
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return new PtClick(this, -1);
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}
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// holding down ctrl
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if (2 == modi) {
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return new PtClick(this, -2);
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}
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SkPoint clickPoint = {x, y};
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fInvMatrix.mapPoints(&clickPoint, 1);
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for (size_t i = 0; i < SK_ARRAY_COUNT(fPts); i++) {
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if (hittest(fPts[i], clickPoint.fX, clickPoint.fY)) {
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return new PtClick(this, (int)i);
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}
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}
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return this->INHERITED::onFindClickHandler(x, y, modi);
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}
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bool onClick(Click* click) override {
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PtClick* ptClick = (PtClick*)click;
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if (ptClick->fIndex >= 0) {
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fPts[ptClick->fIndex].set(click->fCurr.fX , click->fCurr.fY );
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} else if (-1 == ptClick->fIndex) {
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SkScalar xDiff = click->fPrev.fX - click->fCurr.fX;
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SkScalar yDiff = click->fPrev.fY - click->fCurr.fY;
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fTexX += xDiff * fTexScale;
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fTexY += yDiff * fTexScale;
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} else if (-2 == ptClick->fIndex) {
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SkScalar yDiff = click->fCurr.fY - click->fPrev.fY;
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fTexScale += yDiff / 10.0f;
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fTexScale = SkTMax(0.1f, SkTMin(20.f, fTexScale));
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}
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this->inval(nullptr);
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return true;
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}
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private:
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typedef SampleView INHERITED;
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};
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DEF_SAMPLE( return new PerlinPatchView(); )
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