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117 lines
3.3 KiB
117 lines
3.3 KiB
/* |
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* Copyright 2011 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 "Sample.h" |
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#include "SkCanvas.h" |
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#include "SkPaint.h" |
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#include "SkPath.h" |
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// ensure that we don't accidentally screw up the bounds when the oval is |
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// fractional, and the impl computes the center and radii, and uses them to |
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// reconstruct the edges of the circle. |
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// see bug# 1504910 |
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static void test_circlebounds(SkCanvas*) { |
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SkRect r = { 1.39999998f, 1, 21.3999996f, 21 }; |
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SkPath p; |
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p.addOval(r); |
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SkASSERT(r == p.getBounds()); |
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} |
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class CircleView : public Sample { |
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public: |
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static const SkScalar ANIM_DX; |
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static const SkScalar ANIM_DY; |
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static const SkScalar ANIM_RAD; |
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SkScalar fDX, fDY, fRAD; |
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CircleView() { |
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fDX = fDY = fRAD = 0; |
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fN = 3; |
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} |
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protected: |
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virtual bool onQuery(Sample::Event* evt) { |
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if (Sample::TitleQ(*evt)) { |
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Sample::TitleR(evt, "Circles"); |
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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 circle(SkCanvas* canvas, int width, bool aa) { |
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SkPaint paint; |
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paint.setAntiAlias(aa); |
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if (width < 0) { |
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paint.setStyle(SkPaint::kFill_Style); |
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} else { |
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paint.setStyle(SkPaint::kStroke_Style); |
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paint.setStrokeWidth(SkIntToScalar(width)); |
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} |
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canvas->drawCircle(0, 0, SkIntToScalar(9) + fRAD, paint); |
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if (false) { // avoid bit rot, suppress warning |
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test_circlebounds(canvas); |
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} |
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} |
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void drawSix(SkCanvas* canvas, SkScalar dx, SkScalar dy) { |
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for (int width = -1; width <= 1; width++) { |
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canvas->save(); |
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circle(canvas, width, false); |
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canvas->translate(0, dy); |
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circle(canvas, width, true); |
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canvas->restore(); |
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canvas->translate(dx, 0); |
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} |
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} |
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static void make_poly(SkPath* path, int n) { |
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if (n <= 0) { |
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return; |
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} |
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path->incReserve(n + 1); |
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path->moveTo(SK_Scalar1, 0); |
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SkScalar step = SK_ScalarPI * 2 / n; |
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SkScalar angle = 0; |
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for (int i = 1; i < n; i++) { |
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angle += step; |
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SkScalar c, s = SkScalarSinCos(angle, &c); |
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path->lineTo(c, s); |
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} |
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path->close(); |
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} |
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virtual void onDrawContent(SkCanvas* canvas) { |
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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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SkMatrix matrix; |
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matrix.setScale(SkIntToScalar(100), SkIntToScalar(100)); |
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matrix.postTranslate(SkIntToScalar(200), SkIntToScalar(200)); |
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canvas->concat(matrix); |
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for (int n = 3; n < 20; n++) { |
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SkPath path; |
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make_poly(&path, n); |
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SkAutoCanvasRestore acr(canvas, true); |
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canvas->rotate(SkIntToScalar(10) * (n - 3)); |
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canvas->translate(-SK_Scalar1, 0); |
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canvas->drawPath(path, paint); |
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} |
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} |
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private: |
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int fN; |
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typedef Sample INHERITED; |
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}; |
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const SkScalar CircleView::ANIM_DX(SK_Scalar1 / 67); |
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const SkScalar CircleView::ANIM_DY(SK_Scalar1 / 29); |
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const SkScalar CircleView::ANIM_RAD(SK_Scalar1 / 19); |
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////////////////////////////////////////////////////////////////////////////// |
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DEF_SAMPLE( return new CircleView(); )
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