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
12namespace skiagm {
13
14class FillTypePerspGM : public GM {
15    SkPath fPath;
16public:
17    FillTypePerspGM() {}
18
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
27protected:
28
29    SkString onShortName() override {
30        return SkString("filltypespersp");
31    }
32
33    SkISize onISize() override {
34        return SkISize::Make(835, 840);
35    }
36
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
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
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
122private:
123    typedef GM INHERITED;
124};
125
126//////////////////////////////////////////////////////////////////////////////
127
128static GM* MyFactory(void*) { return new FillTypePerspGM; }
129static GMRegistry reg(MyFactory);
130
131}
132