1
2 /*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8 #include "SampleCode.h"
9 #include "SkView.h"
10 #include "SkCanvas.h"
11 #include "SkDevice.h"
12 #include "SkPaint.h"
13
14 // ensure that we don't accidentally screw up the bounds when the oval is
15 // fractional, and the impl computes the center and radii, and uses them to
16 // reconstruct the edges of the circle.
17 // see bug# 1504910
test_circlebounds(SkCanvas * canvas)18 static void test_circlebounds(SkCanvas* canvas) {
19 #ifdef SK_SCALAR_IS_FLOAT
20 SkRect r = { 1.39999998f, 1, 21.3999996f, 21 };
21 SkPath p;
22 p.addOval(r);
23 SkASSERT(r == p.getBounds());
24 #endif
25 }
26
27 class CircleView : public SampleView {
28 public:
29 static const SkScalar ANIM_DX;
30 static const SkScalar ANIM_DY;
31 static const SkScalar ANIM_RAD;
32 SkScalar fDX, fDY, fRAD;
33
CircleView()34 CircleView() {
35 fDX = fDY = fRAD = 0;
36 fN = 3;
37 }
38
39 protected:
40 // overrides from SkEventSink
onQuery(SkEvent * evt)41 virtual bool onQuery(SkEvent* evt) {
42 if (SampleCode::TitleQ(*evt)) {
43 SampleCode::TitleR(evt, "Circles");
44 return true;
45 }
46 return this->INHERITED::onQuery(evt);
47 }
48
circle(SkCanvas * canvas,int width,bool aa)49 void circle(SkCanvas* canvas, int width, bool aa) {
50 SkPaint paint;
51
52 paint.setAntiAlias(aa);
53 if (width < 0) {
54 paint.setStyle(SkPaint::kFill_Style);
55 } else {
56 paint.setStyle(SkPaint::kStroke_Style);
57 paint.setStrokeWidth(SkIntToScalar(width));
58 }
59 canvas->drawCircle(0, 0, SkIntToScalar(9) + fRAD, paint);
60 }
61
drawSix(SkCanvas * canvas,SkScalar dx,SkScalar dy)62 void drawSix(SkCanvas* canvas, SkScalar dx, SkScalar dy) {
63 for (int width = -1; width <= 1; width++) {
64 canvas->save();
65 circle(canvas, width, false);
66 canvas->translate(0, dy);
67 circle(canvas, width, true);
68 canvas->restore();
69 canvas->translate(dx, 0);
70 }
71 }
72
blowup(SkCanvas * canvas,const SkIRect & src,const SkRect & dst)73 static void blowup(SkCanvas* canvas, const SkIRect& src, const SkRect& dst) {
74 SkDevice* device = canvas->getDevice();
75 const SkBitmap& bm = device->accessBitmap(false);
76 canvas->drawBitmapRect(bm, &src, dst, NULL);
77 }
78
make_poly(SkPath * path,int n)79 static void make_poly(SkPath* path, int n) {
80 if (n <= 0) {
81 return;
82 }
83 path->incReserve(n + 1);
84 path->moveTo(SK_Scalar1, 0);
85 SkScalar step = SK_ScalarPI * 2 / n;
86 SkScalar angle = 0;
87 for (int i = 1; i < n; i++) {
88 angle += step;
89 SkScalar c, s = SkScalarSinCos(angle, &c);
90 path->lineTo(c, s);
91 }
92 path->close();
93 }
94
rotate(SkCanvas * canvas,SkScalar angle,SkScalar px,SkScalar py)95 static void rotate(SkCanvas* canvas, SkScalar angle, SkScalar px, SkScalar py) {
96 canvas->translate(-px, -py);
97 canvas->rotate(angle);
98 canvas->translate(px, py);
99 }
100
onDrawContent(SkCanvas * canvas)101 virtual void onDrawContent(SkCanvas* canvas) {
102 SkPaint paint;
103 paint.setAntiAlias(true);
104 paint.setStyle(SkPaint::kStroke_Style);
105 // canvas->drawCircle(250, 250, 220, paint);
106 SkMatrix matrix;
107 matrix.setScale(SkIntToScalar(100), SkIntToScalar(100));
108 matrix.postTranslate(SkIntToScalar(200), SkIntToScalar(200));
109 canvas->concat(matrix);
110 for (int n = 3; n < 20; n++) {
111 SkPath path;
112 make_poly(&path, n);
113 SkAutoCanvasRestore acr(canvas, true);
114 canvas->rotate(SkIntToScalar(10) * (n - 3));
115 canvas->translate(-SK_Scalar1, 0);
116 canvas->drawPath(path, paint);
117 }
118 }
119
120 private:
121 int fN;
122 typedef SampleView INHERITED;
123 };
124
125 const SkScalar CircleView::ANIM_DX(SK_Scalar1 / 67);
126 const SkScalar CircleView::ANIM_DY(SK_Scalar1 / 29);
127 const SkScalar CircleView::ANIM_RAD(SK_Scalar1 / 19);
128
129 //////////////////////////////////////////////////////////////////////////////
130
MyFactory()131 static SkView* MyFactory() { return new CircleView; }
132 static SkViewRegister reg(MyFactory);
133
134