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:
onGetFlags() const27 virtual uint32_t onGetFlags() const SK_OVERRIDE {
28 return kSkipTiled_Flag;
29 }
30
onShortName()31 virtual SkString onShortName() {
32 return SkString("filltypespersp");
33 }
34
onISize()35 virtual SkISize onISize() {
36 return SkISize::Make(835, 840);
37 }
38
showPath(SkCanvas * canvas,int x,int y,SkPath::FillType ft,SkScalar scale,const SkPaint & paint)39 void showPath(SkCanvas* canvas, int x, int y, SkPath::FillType ft,
40 SkScalar scale, const SkPaint& paint) {
41
42 const SkRect r = { 0, 0, SkIntToScalar(150), SkIntToScalar(150) };
43
44 canvas->save();
45 canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
46 canvas->clipRect(r);
47 canvas->drawColor(SK_ColorWHITE);
48 fPath.setFillType(ft);
49 canvas->translate(r.centerX(), r.centerY());
50 canvas->scale(scale, scale);
51 canvas->translate(-r.centerX(), -r.centerY());
52 canvas->drawPath(fPath, paint);
53 canvas->restore();
54 }
55
showFour(SkCanvas * canvas,SkScalar scale,bool aa)56 void showFour(SkCanvas* canvas, SkScalar scale, bool aa) {
57
58 SkPaint paint;
59 SkPoint center = SkPoint::Make(SkIntToScalar(100), SkIntToScalar(100));
60 SkColor colors[] = {SK_ColorBLUE, SK_ColorRED, SK_ColorGREEN};
61 SkScalar pos[] = {0, SK_ScalarHalf, SK_Scalar1};
62 SkShader* s = SkGradientShader::CreateRadial(center,
63 SkIntToScalar(100),
64 colors,
65 pos,
66 SK_ARRAY_COUNT(colors),
67 SkShader::kClamp_TileMode);
68 paint.setShader(s)->unref();
69 paint.setAntiAlias(aa);
70
71 showPath(canvas, 0, 0, SkPath::kWinding_FillType,
72 scale, paint);
73 showPath(canvas, 200, 0, SkPath::kEvenOdd_FillType,
74 scale, paint);
75 showPath(canvas, 00, 200, SkPath::kInverseWinding_FillType,
76 scale, paint);
77 showPath(canvas, 200, 200, SkPath::kInverseEvenOdd_FillType,
78 scale, paint);
79 }
80
onDraw(SkCanvas * canvas)81 virtual void onDraw(SkCanvas* canvas) {
82 this->makePath();
83
84 // do perspective drawPaint as the background;
85 SkPaint bkgnrd;
86 SkPoint center = SkPoint::Make(SkIntToScalar(100),
87 SkIntToScalar(100));
88 SkColor colors[] = {SK_ColorBLACK, SK_ColorCYAN,
89 SK_ColorYELLOW, SK_ColorWHITE};
90 SkScalar pos[] = {0, SK_ScalarHalf / 2,
91 3 * SK_ScalarHalf / 2, SK_Scalar1};
92 SkShader* s = SkGradientShader::CreateRadial(center,
93 SkIntToScalar(1000),
94 colors,
95 pos,
96 SK_ARRAY_COUNT(colors),
97 SkShader::kClamp_TileMode);
98 bkgnrd.setShader(s)->unref();
99 canvas->save();
100 canvas->translate(SkIntToScalar(100), SkIntToScalar(100));
101 SkMatrix mat;
102 mat.reset();
103 mat.setPerspY(SkScalarToPersp(SK_Scalar1 / 1000));
104 canvas->concat(mat);
105 canvas->drawPaint(bkgnrd);
106 canvas->restore();
107
108 // draw the paths in perspective
109 SkMatrix persp;
110 persp.reset();
111 persp.setPerspX(SkScalarToPersp(-SK_Scalar1 / 1800));
112 persp.setPerspY(SkScalarToPersp(SK_Scalar1 / 500));
113 canvas->concat(persp);
114
115 canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
116 const SkScalar scale = SkIntToScalar(5)/4;
117
118 showFour(canvas, SK_Scalar1, false);
119 canvas->translate(SkIntToScalar(450), 0);
120 showFour(canvas, scale, false);
121
122 canvas->translate(SkIntToScalar(-450), SkIntToScalar(450));
123 showFour(canvas, SK_Scalar1, true);
124 canvas->translate(SkIntToScalar(450), 0);
125 showFour(canvas, scale, true);
126 }
127
128 private:
129 typedef GM INHERITED;
130 };
131
132 //////////////////////////////////////////////////////////////////////////////
133
MyFactory(void *)134 static GM* MyFactory(void*) { return new FillTypePerspGM; }
135 static GMRegistry reg(MyFactory);
136
137 }
138