| #include "SampleCode.h" |
| #include "SkView.h" |
| #include "SkCanvas.h" |
| #include "SkDevice.h" |
| #include "SkPaint.h" |
| |
| // ensure that we don't accidentally screw up the bounds when the oval is |
| // fractional, and the impl computes the center and radii, and uses them to |
| // reconstruct the edges of the circle. |
| // see bug# 1504910 |
| static void test_circlebounds(SkCanvas* canvas) { |
| #ifdef SK_SCALAR_IS_FLOAT |
| SkRect r = { 1.39999998, 1, 21.3999996, 21 }; |
| SkPath p; |
| p.addOval(r); |
| SkASSERT(r == p.getBounds()); |
| #endif |
| } |
| |
| class CircleView : public SkView { |
| public: |
| static const SkScalar ANIM_DX; |
| static const SkScalar ANIM_DY; |
| static const SkScalar ANIM_RAD; |
| SkScalar fDX, fDY, fRAD; |
| |
| CircleView() { |
| fDX = fDY = fRAD = 0; |
| fN = 3; |
| } |
| |
| protected: |
| // overrides from SkEventSink |
| virtual bool onQuery(SkEvent* evt) { |
| if (SampleCode::TitleQ(*evt)) { |
| SampleCode::TitleR(evt, "Circles"); |
| return true; |
| } |
| return this->INHERITED::onQuery(evt); |
| } |
| |
| void drawBG(SkCanvas* canvas) { |
| canvas->drawColor(SK_ColorWHITE); |
| } |
| |
| void circle(SkCanvas* canvas, int width, bool aa) { |
| SkPaint paint; |
| |
| paint.setAntiAlias(aa); |
| if (width < 0) { |
| paint.setStyle(SkPaint::kFill_Style); |
| } else { |
| paint.setStyle(SkPaint::kStroke_Style); |
| paint.setStrokeWidth(SkIntToScalar(width)); |
| } |
| canvas->drawCircle(0, 0, SkIntToScalar(9) + fRAD, paint); |
| } |
| |
| void drawSix(SkCanvas* canvas, SkScalar dx, SkScalar dy) { |
| for (int width = -1; width <= 1; width++) { |
| canvas->save(); |
| circle(canvas, width, false); |
| canvas->translate(0, dy); |
| circle(canvas, width, true); |
| canvas->restore(); |
| canvas->translate(dx, 0); |
| } |
| } |
| |
| static void blowup(SkCanvas* canvas, const SkIRect& src, const SkRect& dst) { |
| SkDevice* device = canvas->getDevice(); |
| const SkBitmap& bm = device->accessBitmap(false); |
| canvas->drawBitmapRect(bm, &src, dst, NULL); |
| } |
| |
| static void make_poly(SkPath* path, int n) { |
| if (n <= 0) { |
| return; |
| } |
| path->incReserve(n + 1); |
| path->moveTo(SK_Scalar1, 0); |
| SkScalar step = SK_ScalarPI * 2 / n; |
| SkScalar angle = 0; |
| for (int i = 1; i < n; i++) { |
| angle += step; |
| SkScalar c, s = SkScalarSinCos(angle, &c); |
| path->lineTo(c, s); |
| } |
| path->close(); |
| } |
| |
| static void rotate(SkCanvas* canvas, SkScalar angle, SkScalar px, SkScalar py) { |
| canvas->translate(-px, -py); |
| canvas->rotate(angle); |
| canvas->translate(px, py); |
| } |
| |
| virtual void onDraw(SkCanvas* canvas) { |
| this->drawBG(canvas); |
| |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setStyle(SkPaint::kStroke_Style); |
| // canvas->drawCircle(250, 250, 220, paint); |
| SkMatrix matrix; |
| matrix.setScale(SkIntToScalar(100), SkIntToScalar(100)); |
| matrix.postTranslate(SkIntToScalar(200), SkIntToScalar(200)); |
| canvas->concat(matrix); |
| for (int n = 3; n < 20; n++) { |
| SkPath path; |
| make_poly(&path, n); |
| SkAutoCanvasRestore acr(canvas, true); |
| canvas->rotate(SkIntToScalar(10) * (n - 3)); |
| canvas->translate(-SK_Scalar1, 0); |
| canvas->drawPath(path, paint); |
| } |
| |
| if (false) { |
| test_circlebounds(canvas); |
| |
| SkScalar dx = SkIntToScalar(32); |
| SkScalar dy = SkIntToScalar(32); |
| |
| canvas->translate(dx + fDX, dy + fDY); |
| drawSix(canvas, dx, dy); |
| |
| canvas->translate(dx, 0); |
| canvas->translate(SK_ScalarHalf, SK_ScalarHalf); |
| drawSix(canvas, dx, dy); |
| |
| fDX += ANIM_DX; |
| fDY += ANIM_DY; |
| fRAD += ANIM_RAD; |
| fN += 1; |
| if (fN > 40) { |
| fN = 3; |
| } |
| this->inval(NULL); |
| } |
| } |
| |
| private: |
| int fN; |
| typedef SkView INHERITED; |
| }; |
| |
| const SkScalar CircleView::ANIM_DX(SK_Scalar1 / 67); |
| const SkScalar CircleView::ANIM_DY(SK_Scalar1 / 29); |
| const SkScalar CircleView::ANIM_RAD(SK_Scalar1 / 19); |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| static SkView* MyFactory() { return new CircleView; } |
| static SkViewRegister reg(MyFactory); |
| |