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:
onShortName()27 virtual SkString onShortName() {
28 return SkString("filltypespersp");
29 }
30
onISize()31 virtual SkISize onISize() {
32 return make_isize(835, 840);
33 }
34
showPath(SkCanvas * canvas,int x,int y,SkPath::FillType ft,SkScalar scale,const SkPaint & paint)35 void showPath(SkCanvas* canvas, int x, int y, SkPath::FillType ft,
36 SkScalar scale, const SkPaint& paint) {
37
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
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 SkShader* s = SkGradientShader::CreateRadial(center,
59 SkIntToScalar(100),
60 colors,
61 pos,
62 SK_ARRAY_COUNT(colors),
63 SkShader::kClamp_TileMode);
64 paint.setShader(s)->unref();
65 paint.setAntiAlias(aa);
66
67 showPath(canvas, 0, 0, SkPath::kWinding_FillType,
68 scale, paint);
69 showPath(canvas, 200, 0, SkPath::kEvenOdd_FillType,
70 scale, paint);
71 showPath(canvas, 00, 200, SkPath::kInverseWinding_FillType,
72 scale, paint);
73 showPath(canvas, 200, 200, SkPath::kInverseEvenOdd_FillType,
74 scale, paint);
75 }
76
onDraw(SkCanvas * canvas)77 virtual void onDraw(SkCanvas* canvas) {
78 this->makePath();
79
80 // do perspective drawPaint as the background;
81 SkPaint bkgnrd;
82 SkPoint center = SkPoint::Make(SkIntToScalar(100),
83 SkIntToScalar(100));
84 SkColor colors[] = {SK_ColorBLACK, SK_ColorCYAN,
85 SK_ColorYELLOW, SK_ColorWHITE};
86 SkScalar pos[] = {0, SK_ScalarHalf / 2,
87 3 * SK_ScalarHalf / 2, SK_Scalar1};
88 SkShader* s = SkGradientShader::CreateRadial(center,
89 SkIntToScalar(1000),
90 colors,
91 pos,
92 SK_ARRAY_COUNT(colors),
93 SkShader::kClamp_TileMode);
94 bkgnrd.setShader(s)->unref();
95 canvas->save();
96 canvas->translate(SkIntToScalar(100), SkIntToScalar(100));
97 SkMatrix mat;
98 mat.reset();
99 mat.setPerspY(SkScalarToPersp(SK_Scalar1 / 1000));
100 canvas->concat(mat);
101 canvas->drawPaint(bkgnrd);
102 canvas->restore();
103
104 // draw the paths in perspective
105 SkMatrix persp;
106 persp.reset();
107 persp.setPerspX(SkScalarToPersp(-SK_Scalar1 / 1800));
108 persp.setPerspY(SkScalarToPersp(SK_Scalar1 / 500));
109 canvas->concat(persp);
110
111 canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
112 const SkScalar scale = SkIntToScalar(5)/4;
113
114 showFour(canvas, SK_Scalar1, false);
115 canvas->translate(SkIntToScalar(450), 0);
116 showFour(canvas, scale, false);
117
118 canvas->translate(SkIntToScalar(-450), SkIntToScalar(450));
119 showFour(canvas, SK_Scalar1, true);
120 canvas->translate(SkIntToScalar(450), 0);
121 showFour(canvas, scale, true);
122 }
123
124 private:
125 typedef GM INHERITED;
126 };
127
128 //////////////////////////////////////////////////////////////////////////////
129
MyFactory(void *)130 static GM* MyFactory(void*) { return new FillTypePerspGM; }
131 static GMRegistry reg(MyFactory);
132
133 }
134