1 /*
2  * Copyright 2011 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #include "gm.h"
9 #include "SkGradientShader.h"
10 #include "SkPath.h"
11 
12 namespace skiagm {
13 
14 class FillTypePerspGM : public GM {
15     SkPath fPath;
16 public:
FillTypePerspGM()17     FillTypePerspGM() {}
18 
makePath()19     void makePath() {
20         if (fPath.isEmpty()) {
21             const SkScalar radius = SkIntToScalar(45);
22             fPath.addCircle(SkIntToScalar(50), SkIntToScalar(50), radius);
23             fPath.addCircle(SkIntToScalar(100), SkIntToScalar(100), radius);
24         }
25     }
26 
27 protected:
28 
onShortName()29     SkString onShortName() override {
30         return SkString("filltypespersp");
31     }
32 
onISize()33     SkISize onISize() override {
34         return SkISize::Make(835, 840);
35     }
36 
showPath(SkCanvas * canvas,int x,int y,SkPath::FillType ft,SkScalar scale,const SkPaint & paint)37     void showPath(SkCanvas* canvas, int x, int y, SkPath::FillType ft,
38                   SkScalar scale, const SkPaint& paint) {
39         const SkRect r = { 0, 0, SkIntToScalar(150), SkIntToScalar(150) };
40 
41         canvas->save();
42         canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
43         canvas->clipRect(r);
44         canvas->drawColor(SK_ColorWHITE);
45         fPath.setFillType(ft);
46         canvas->translate(r.centerX(), r.centerY());
47         canvas->scale(scale, scale);
48         canvas->translate(-r.centerX(), -r.centerY());
49         canvas->drawPath(fPath, paint);
50         canvas->restore();
51     }
52 
showFour(SkCanvas * canvas,SkScalar scale,bool aa)53     void showFour(SkCanvas* canvas, SkScalar scale, bool aa) {
54         SkPaint paint;
55         SkPoint center = SkPoint::Make(SkIntToScalar(100), SkIntToScalar(100));
56         SkColor colors[] = {SK_ColorBLUE, SK_ColorRED, SK_ColorGREEN};
57         SkScalar pos[] = {0, SK_ScalarHalf, SK_Scalar1};
58         paint.setShader(SkGradientShader::MakeRadial(center,
59                                                      SkIntToScalar(100),
60                                                      colors,
61                                                      pos,
62                                                      SK_ARRAY_COUNT(colors),
63                                                      SkShader::kClamp_TileMode));
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         bkgnrd.setShader(SkGradientShader::MakeRadial(center,
88                                                       SkIntToScalar(1000),
89                                                       colors,
90                                                       pos,
91                                                       SK_ARRAY_COUNT(colors),
92                                                       SkShader::kClamp_TileMode));
93         canvas->save();
94             canvas->translate(SkIntToScalar(100), SkIntToScalar(100));
95             SkMatrix mat;
96             mat.reset();
97             mat.setPerspY(SK_Scalar1 / 1000);
98             canvas->concat(mat);
99             canvas->drawPaint(bkgnrd);
100         canvas->restore();
101 
102         // draw the paths in perspective
103         SkMatrix persp;
104         persp.reset();
105         persp.setPerspX(-SK_Scalar1 / 1800);
106         persp.setPerspY(SK_Scalar1 / 500);
107         canvas->concat(persp);
108 
109         canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
110         const SkScalar scale = SkIntToScalar(5)/4;
111 
112         showFour(canvas, SK_Scalar1, false);
113         canvas->translate(SkIntToScalar(450), 0);
114         showFour(canvas, scale, false);
115 
116         canvas->translate(SkIntToScalar(-450), SkIntToScalar(450));
117         showFour(canvas, SK_Scalar1, true);
118         canvas->translate(SkIntToScalar(450), 0);
119         showFour(canvas, scale, true);
120     }
121 
122 private:
123     typedef GM INHERITED;
124 };
125 
126 //////////////////////////////////////////////////////////////////////////////
127 
128 DEF_GM( return new FillTypePerspGM; )
129 
130 }
131