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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/gm.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkColor.h"
11 #include "include/core/SkMatrix.h"
12 #include "include/core/SkPaint.h"
13 #include "include/core/SkPathBuilder.h"
14 #include "include/core/SkPoint.h"
15 #include "include/core/SkRect.h"
16 #include "include/core/SkScalar.h"
17 #include "include/core/SkShader.h"
18 #include "include/core/SkSize.h"
19 #include "include/core/SkString.h"
20 #include "include/core/SkTileMode.h"
21 #include "include/core/SkTypes.h"
22 #include "include/effects/SkGradientShader.h"
23 
24 namespace skiagm {
25 
26 class FillTypePerspGM : public GM {
27     SkPath fPath;
28 public:
FillTypePerspGM()29     FillTypePerspGM() {}
30 
makePath()31     void makePath() {
32         if (fPath.isEmpty()) {
33             const SkScalar radius = SkIntToScalar(45);
34             fPath = SkPathBuilder().addCircle(SkIntToScalar(50), SkIntToScalar(50), radius)
35                                    .addCircle(SkIntToScalar(100), SkIntToScalar(100), radius)
36                                    .detach();
37         }
38     }
39 
40 protected:
41 
onShortName()42     SkString onShortName() override {
43         return SkString("filltypespersp");
44     }
45 
onISize()46     SkISize onISize() override {
47         return SkISize::Make(835, 840);
48     }
49 
showPath(SkCanvas * canvas,int x,int y,SkPathFillType ft,SkScalar scale,const SkPaint & paint)50     void showPath(SkCanvas* canvas, int x, int y, SkPathFillType ft,
51                   SkScalar scale, const SkPaint& paint) {
52         const SkRect r = { 0, 0, SkIntToScalar(150), SkIntToScalar(150) };
53 
54         canvas->save();
55         canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
56         canvas->clipRect(r);
57         canvas->drawColor(SK_ColorWHITE);
58         fPath.setFillType(ft);
59         canvas->translate(r.centerX(), r.centerY());
60         canvas->scale(scale, scale);
61         canvas->translate(-r.centerX(), -r.centerY());
62         canvas->drawPath(fPath, paint);
63         canvas->restore();
64     }
65 
showFour(SkCanvas * canvas,SkScalar scale,bool aa)66     void showFour(SkCanvas* canvas, SkScalar scale, bool aa) {
67         SkPaint paint;
68         SkPoint center = SkPoint::Make(SkIntToScalar(100), SkIntToScalar(100));
69         SkColor colors[] = {SK_ColorBLUE, SK_ColorRED, SK_ColorGREEN};
70         SkScalar pos[] = {0, SK_ScalarHalf, SK_Scalar1};
71         paint.setShader(SkGradientShader::MakeRadial(center,
72                                                      SkIntToScalar(100),
73                                                      colors,
74                                                      pos,
75                                                      SK_ARRAY_COUNT(colors),
76                                                      SkTileMode::kClamp));
77         paint.setAntiAlias(aa);
78 
79         showPath(canvas,   0,   0, SkPathFillType::kWinding,
80                  scale, paint);
81         showPath(canvas, 200,   0, SkPathFillType::kEvenOdd,
82                  scale, paint);
83         showPath(canvas,  00, 200, SkPathFillType::kInverseWinding,
84                  scale, paint);
85         showPath(canvas, 200, 200, SkPathFillType::kInverseEvenOdd,
86                  scale, paint);
87     }
88 
onDraw(SkCanvas * canvas)89     void onDraw(SkCanvas* canvas) override {
90         this->makePath();
91 
92         // do perspective drawPaint as the background;
93         SkPaint bkgnrd;
94         SkPoint center = SkPoint::Make(SkIntToScalar(100),
95                                        SkIntToScalar(100));
96         SkColor colors[] = {SK_ColorBLACK, SK_ColorCYAN,
97                             SK_ColorYELLOW, SK_ColorWHITE};
98         SkScalar pos[] = {0, SK_ScalarHalf / 2,
99                           3 * SK_ScalarHalf / 2, SK_Scalar1};
100         bkgnrd.setShader(SkGradientShader::MakeRadial(center,
101                                                       SkIntToScalar(1000),
102                                                       colors,
103                                                       pos,
104                                                       SK_ARRAY_COUNT(colors),
105                                                       SkTileMode::kClamp));
106         canvas->save();
107             canvas->translate(SkIntToScalar(100), SkIntToScalar(100));
108             SkMatrix mat;
109             mat.reset();
110             mat.setPerspY(SK_Scalar1 / 1000);
111             canvas->concat(mat);
112             canvas->drawPaint(bkgnrd);
113         canvas->restore();
114 
115         // draw the paths in perspective
116         SkMatrix persp;
117         persp.reset();
118         persp.setPerspX(-SK_Scalar1 / 1800);
119         persp.setPerspY(SK_Scalar1 / 500);
120         canvas->concat(persp);
121 
122         canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
123         const SkScalar scale = SkIntToScalar(5)/4;
124 
125         showFour(canvas, SK_Scalar1, false);
126         canvas->translate(SkIntToScalar(450), 0);
127         showFour(canvas, scale, false);
128 
129         canvas->translate(SkIntToScalar(-450), SkIntToScalar(450));
130         showFour(canvas, SK_Scalar1, true);
131         canvas->translate(SkIntToScalar(450), 0);
132         showFour(canvas, scale, true);
133     }
134 
135 private:
136     using INHERITED = GM;
137 };
138 
139 //////////////////////////////////////////////////////////////////////////////
140 
141 DEF_GM( return new FillTypePerspGM; )
142 
143 }  // namespace skiagm
144