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 "gm.h"
9 #include "SkGradientShader.h"
10
11 namespace skiagm {
12
13 class FillTypePerspGM : public GM {
14 SkPath fPath;
15 public:
FillTypePerspGM()16 FillTypePerspGM() {}
17
makePath()18 void makePath() {
19 if (fPath.isEmpty()) {
20 const SkScalar radius = SkIntToScalar(45);
21 fPath.addCircle(SkIntToScalar(50), SkIntToScalar(50), radius);
22 fPath.addCircle(SkIntToScalar(100), SkIntToScalar(100), radius);
23 }
24 }
25
26 protected:
27
onShortName()28 SkString onShortName() override {
29 return SkString("filltypespersp");
30 }
31
onISize()32 SkISize onISize() override {
33 return SkISize::Make(835, 840);
34 }
35
showPath(SkCanvas * canvas,int x,int y,SkPath::FillType ft,SkScalar scale,const SkPaint & paint)36 void showPath(SkCanvas* canvas, int x, int y, SkPath::FillType ft,
37 SkScalar scale, const SkPaint& paint) {
38 const SkRect r = { 0, 0, SkIntToScalar(150), SkIntToScalar(150) };
39
40 canvas->save();
41 canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
42 canvas->clipRect(r);
43 canvas->drawColor(SK_ColorWHITE);
44 fPath.setFillType(ft);
45 canvas->translate(r.centerX(), r.centerY());
46 canvas->scale(scale, scale);
47 canvas->translate(-r.centerX(), -r.centerY());
48 canvas->drawPath(fPath, paint);
49 canvas->restore();
50 }
51
showFour(SkCanvas * canvas,SkScalar scale,bool aa)52 void showFour(SkCanvas* canvas, SkScalar scale, bool aa) {
53 SkPaint paint;
54 SkPoint center = SkPoint::Make(SkIntToScalar(100), SkIntToScalar(100));
55 SkColor colors[] = {SK_ColorBLUE, SK_ColorRED, SK_ColorGREEN};
56 SkScalar pos[] = {0, SK_ScalarHalf, SK_Scalar1};
57 SkShader* s = SkGradientShader::CreateRadial(center,
58 SkIntToScalar(100),
59 colors,
60 pos,
61 SK_ARRAY_COUNT(colors),
62 SkShader::kClamp_TileMode);
63 paint.setShader(s)->unref();
64 paint.setAntiAlias(aa);
65
66 showPath(canvas, 0, 0, SkPath::kWinding_FillType,
67 scale, paint);
68 showPath(canvas, 200, 0, SkPath::kEvenOdd_FillType,
69 scale, paint);
70 showPath(canvas, 00, 200, SkPath::kInverseWinding_FillType,
71 scale, paint);
72 showPath(canvas, 200, 200, SkPath::kInverseEvenOdd_FillType,
73 scale, paint);
74 }
75
onDraw(SkCanvas * canvas)76 void onDraw(SkCanvas* canvas) override {
77 this->makePath();
78
79 // do perspective drawPaint as the background;
80 SkPaint bkgnrd;
81 SkPoint center = SkPoint::Make(SkIntToScalar(100),
82 SkIntToScalar(100));
83 SkColor colors[] = {SK_ColorBLACK, SK_ColorCYAN,
84 SK_ColorYELLOW, SK_ColorWHITE};
85 SkScalar pos[] = {0, SK_ScalarHalf / 2,
86 3 * SK_ScalarHalf / 2, SK_Scalar1};
87 SkShader* s = SkGradientShader::CreateRadial(center,
88 SkIntToScalar(1000),
89 colors,
90 pos,
91 SK_ARRAY_COUNT(colors),
92 SkShader::kClamp_TileMode);
93 bkgnrd.setShader(s)->unref();
94 canvas->save();
95 canvas->translate(SkIntToScalar(100), SkIntToScalar(100));
96 SkMatrix mat;
97 mat.reset();
98 mat.setPerspY(SK_Scalar1 / 1000);
99 canvas->concat(mat);
100 canvas->drawPaint(bkgnrd);
101 canvas->restore();
102
103 // draw the paths in perspective
104 SkMatrix persp;
105 persp.reset();
106 persp.setPerspX(-SK_Scalar1 / 1800);
107 persp.setPerspY(SK_Scalar1 / 500);
108 canvas->concat(persp);
109
110 canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
111 const SkScalar scale = SkIntToScalar(5)/4;
112
113 showFour(canvas, SK_Scalar1, false);
114 canvas->translate(SkIntToScalar(450), 0);
115 showFour(canvas, scale, false);
116
117 canvas->translate(SkIntToScalar(-450), SkIntToScalar(450));
118 showFour(canvas, SK_Scalar1, true);
119 canvas->translate(SkIntToScalar(450), 0);
120 showFour(canvas, scale, true);
121 }
122
123 private:
124 typedef GM INHERITED;
125 };
126
127 //////////////////////////////////////////////////////////////////////////////
128
MyFactory(void *)129 static GM* MyFactory(void*) { return new FillTypePerspGM; }
130 static GMRegistry reg(MyFactory);
131
132 }
133