e16efc1882
git-svn-id: http://skia.googlecode.com/svn/trunk@7406 2bbb7eff-a529-9590-31e7-b0007b416f81
362 lines
9.7 KiB
C++
362 lines
9.7 KiB
C++
/*
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* Copyright 2012 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 "SkView.h"
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#include "SkCanvas.h"
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#include "SkRandom.h"
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#include "SkRRect.h"
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#include "SkColorPriv.h"
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static void rotateAbout(SkCanvas* canvas, SkScalar degrees,
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SkScalar cx, SkScalar cy) {
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canvas->translate(cx, cy);
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canvas->rotate(degrees);
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canvas->translate(-cx, -cy);
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}
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class RotateCirclesView : public SampleView {
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public:
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RotateCirclesView() {
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this->setBGColor(SK_ColorLTGRAY);
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fAngle = 0;
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}
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protected:
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// overrides from SkEventSink
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virtual bool onQuery(SkEvent* evt) {
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if (SampleCode::TitleQ(*evt)) {
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SampleCode::TitleR(evt, "RotateCircles");
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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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virtual void onDrawContent(SkCanvas* canvas) {
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SkRandom rand;
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setStrokeWidth(20);
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SkScalar cx = 240;
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SkScalar cy = 240;
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SkScalar DX = 240 * 2;
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SkColor color = 0;
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float scale = 1;
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float sign = 0.3f;
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for (SkScalar rad = 200; rad >= 20; rad -= 15) {
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sign = -sign;
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scale += 0.2f;
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paint.setColor(rand.nextU());
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paint.setAlpha(0xFF);
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color = ~color;
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paint.setStyle(SkPaint::kFill_Style);
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canvas->save();
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rotateAbout(canvas, fAngle * scale * sign, cx, cy);
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canvas->drawCircle(cx, cy, rad, paint);
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canvas->restore();
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(rad*2);
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canvas->save();
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rotateAbout(canvas, fAngle * scale * sign, cx + DX, cy);
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canvas->drawCircle(cx + DX, cy, 10, paint);
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canvas->restore();
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canvas->save();
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rotateAbout(canvas, fAngle * scale * sign, cx + DX, cy + DX);
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canvas->drawCircle(cx + DX, cy + DX, 10, paint);
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canvas->restore();
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}
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fAngle = (fAngle + 1) % 360;
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this->inval(NULL);
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}
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private:
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int fAngle;
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typedef SkView INHERITED;
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};
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class TestCirclesView : public SampleView {
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public:
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TestCirclesView() {
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}
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protected:
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virtual bool onQuery(SkEvent* evt) SK_OVERRIDE {
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if (SampleCode::TitleQ(*evt)) {
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SampleCode::TitleR(evt, "RotateCircles2");
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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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void draw_real_circle(SkCanvas* canvas, SkScalar radius) {
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int w = SkScalarCeilToInt(radius * 2);
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int h = w;
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SkBitmap bm;
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bm.setConfig(SkBitmap::kARGB_8888_Config, w, h);
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bm.allocPixels();
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bm.eraseColor(0);
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SkAutoLockPixels alp(bm);
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SkScalar cx = radius;
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SkScalar cy = radius;
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for (int y = 0; y < h; y += 1) {
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for (int x = 0; x < w; x += 1) {
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float d = sqrtf((x - cx)*(x - cx) + (y - cy)*(y - cy));
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if (d <= radius) {
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*bm.getAddr32(x, y) = SkPackARGB32(0xFF, 0, 0, 0);
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}
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}
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}
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canvas->drawBitmap(bm, 0, 0, NULL);
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}
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virtual void onDrawContent(SkCanvas* canvas) {
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SkScalar radius = 256;
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canvas->translate(10, 10);
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draw_real_circle(canvas, radius);
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setColor(0x80FF0000);
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canvas->drawCircle(radius, radius, radius, paint);
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(radius);
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paint.setColor(0x8000FF00);
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canvas->drawCircle(radius, radius, radius/2, paint);
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}
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private:
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typedef SkView INHERITED;
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};
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static bool hittest(const SkPoint& target, SkScalar x, SkScalar y) {
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const SkScalar TOL = 7;
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return SkPoint::Distance(target, SkPoint::Make(x, y)) <= TOL;
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}
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static int getOnCurvePoints(const SkPath& path, SkPoint storage[]) {
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SkPath::RawIter iter(path);
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SkPoint pts[4];
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SkPath::Verb verb;
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int count = 0;
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while ((verb = iter.next(pts)) != SkPath::kDone_Verb) {
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switch (verb) {
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case SkPath::kMove_Verb:
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case SkPath::kLine_Verb:
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case SkPath::kQuad_Verb:
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case SkPath::kCubic_Verb:
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storage[count++] = pts[0];
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break;
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default:
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break;
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}
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}
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return count;
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}
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#include "SkPathMeasure.h"
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class TestStrokeView : public SampleView {
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enum {
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SKELETON_COLOR = 0xFF0000FF,
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WIREFRAME_COLOR = 0x80FF0000
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};
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enum {
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kCount = 9
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};
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SkPoint fPts[kCount];
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SkScalar fWidth, fDWidth;
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public:
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TestStrokeView() {
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this->setBGColor(SK_ColorLTGRAY);
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fPts[0].set(50, 200);
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fPts[1].set(50, 100);
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fPts[2].set(150, 50);
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fPts[3].set(300, 50);
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fPts[4].set(350, 200);
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fPts[5].set(350, 100);
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fPts[6].set(450, 50);
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fPts[7].set(200, 200);
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fPts[8].set(400, 400);
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fWidth = 50;
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fDWidth = 0.25f;
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}
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protected:
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virtual bool onQuery(SkEvent* evt) SK_OVERRIDE {
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if (SampleCode::TitleQ(*evt)) {
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SampleCode::TitleR(evt, "RotateCircles3");
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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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void draw_points(SkCanvas* canvas, const SkPath& path, SkColor color,
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bool show_lines) {
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SkPaint paint;
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paint.setColor(color);
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paint.setAlpha(0x80);
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int n = path.countPoints();
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SkAutoSTArray<32, SkPoint> pts(n);
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if (show_lines) {
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path.getPoints(pts.get(), n);
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canvas->drawPoints(SkCanvas::kPolygon_PointMode, n, pts.get(), paint);
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} else {
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n = getOnCurvePoints(path, pts.get());
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}
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paint.setStrokeWidth(5);
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canvas->drawPoints(SkCanvas::kPoints_PointMode, n, pts.get(), paint);
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}
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void draw_ribs(SkCanvas* canvas, const SkPath& path, SkScalar width,
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SkColor color) {
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const SkScalar radius = width / 2;
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SkPathMeasure meas(path, false);
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SkScalar total = meas.getLength();
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SkScalar delta = 8;
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SkPaint paint;
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paint.setColor(color);
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SkPoint pos, tan;
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for (SkScalar dist = 0; dist <= total; dist += delta) {
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if (meas.getPosTan(dist, &pos, &tan)) {
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tan.scale(radius);
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tan.rotateCCW();
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canvas->drawLine(pos.x() + tan.x(), pos.y() + tan.y(),
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pos.x() - tan.x(), pos.y() - tan.y(), paint);
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}
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}
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}
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void draw_stroke(SkCanvas* canvas, const SkPath& path, SkScalar width) {
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setColor(SKELETON_COLOR);
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canvas->drawPath(path, paint);
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draw_points(canvas, path, SKELETON_COLOR, true);
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draw_ribs(canvas, path, width, 0xFF00FF00);
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SkPath fill;
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SkPaint p;
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p.setStyle(SkPaint::kStroke_Style);
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p.setStrokeWidth(width);
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p.getFillPath(path, &fill);
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paint.setColor(WIREFRAME_COLOR);
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canvas->drawPath(fill, paint);
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draw_points(canvas, fill, WIREFRAME_COLOR, false);
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}
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virtual void onDrawContent(SkCanvas* canvas) {
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SkPath path;
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SkScalar width = fWidth;
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path.moveTo(fPts[0]);
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path.cubicTo(fPts[1], fPts[2], fPts[3]);
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draw_stroke(canvas, path, width);
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path.reset();
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path.moveTo(fPts[4]);
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path.quadTo(fPts[5], fPts[6]);
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draw_stroke(canvas, path, width);
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SkScalar rad = 32;
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SkRect r;
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r.set(&fPts[7], 2);
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path.reset();
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SkRRect rr;
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rr.setRectXY(r, rad, rad);
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path.addRRect(rr);
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draw_stroke(canvas, path, width);
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path.reset();
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SkRRect rr2;
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rr.inset(width/2, width/2, &rr2);
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path.addRRect(rr2, SkPath::kCCW_Direction);
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rr.inset(-width/2, -width/2, &rr2);
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path.addRRect(rr2, SkPath::kCW_Direction);
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setColor(0x40FF8844);
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canvas->drawPath(path, paint);
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fWidth += fDWidth;
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if (fDWidth > 0 && fWidth > 100) {
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fDWidth = -fDWidth;
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} else if (fDWidth < 0 && fWidth < 10) {
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fDWidth = -fDWidth;
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}
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this->inval(NULL);
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}
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class MyClick : public Click {
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public:
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int fIndex;
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MyClick(SkView* target, int index) : Click(target), fIndex(index) {}
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};
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virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y,
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unsigned modi) SK_OVERRIDE {
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for (size_t i = 0; i < SK_ARRAY_COUNT(fPts); ++i) {
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if (hittest(fPts[i], x, y)) {
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return new MyClick(this, 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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virtual bool onClick(Click* click) {
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int index = ((MyClick*)click)->fIndex;
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fPts[index].offset(SkIntToScalar(click->fICurr.fX - click->fIPrev.fX),
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SkIntToScalar(click->fICurr.fY - click->fIPrev.fY));
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this->inval(NULL);
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return true;
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}
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private:
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typedef SkView INHERITED;
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};
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///////////////////////////////////////////////////////////////////////////////
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static SkView* F0() { return new RotateCirclesView; }
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static SkViewRegister gR0(F0);
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static SkView* F1() { return new TestCirclesView; }
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static SkViewRegister gR1(F1);
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static SkView* F2() { return new TestStrokeView; }
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static SkViewRegister gR2(F2);
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