filltypespersp.cpp revision 36352bf5e38f45a70ee4f4fc132a38048d38206d 
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
11namespace skiagm {
12
13class FillTypePerspGM : public GM {
14    SkPath fPath;
15public:
16    FillTypePerspGM() {}
17
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
26protected:
27
28    SkString onShortName() override {
29        return SkString("filltypespersp");
30    }
31
32    SkISize onISize() override {
33        return SkISize::Make(835, 840);
34    }
35
36    void showPath(SkCanvas* canvas, int x, int y, SkPath::FillType ft,
37                  SkScalar scale, const SkPaint& paint) {
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
52    void showFour(SkCanvas* canvas, SkScalar scale, bool aa) {
53        SkPaint paint;
54        SkPoint center = SkPoint::Make(SkIntToScalar(100), SkIntToScalar(100));
55        SkColor colors[] = {SK_ColorBLUE, SK_ColorRED, SK_ColorGREEN};
56        SkScalar pos[] = {0, SK_ScalarHalf, SK_Scalar1};
57        SkShader* s = SkGradientShader::CreateRadial(center,
58                                                     SkIntToScalar(100),
59                                                     colors,
60                                                     pos,
61                                                     SK_ARRAY_COUNT(colors),
62                                                     SkShader::kClamp_TileMode);
63        paint.setShader(s)->unref();
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        SkShader* s = SkGradientShader::CreateRadial(center,
88                                                     SkIntToScalar(1000),
89                                                     colors,
90                                                     pos,
91                                                     SK_ARRAY_COUNT(colors),
92                                                     SkShader::kClamp_TileMode);
93        bkgnrd.setShader(s)->unref();
94        canvas->save();
95            canvas->translate(SkIntToScalar(100), SkIntToScalar(100));
96            SkMatrix mat;
97            mat.reset();
98            mat.setPerspY(SK_Scalar1 / 1000);
99            canvas->concat(mat);
100            canvas->drawPaint(bkgnrd);
101        canvas->restore();
102
103        // draw the paths in perspective
104        SkMatrix persp;
105        persp.reset();
106        persp.setPerspX(-SK_Scalar1 / 1800);
107        persp.setPerspY(SK_Scalar1 / 500);
108        canvas->concat(persp);
109
110        canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
111        const SkScalar scale = SkIntToScalar(5)/4;
112
113        showFour(canvas, SK_Scalar1, false);
114        canvas->translate(SkIntToScalar(450), 0);
115        showFour(canvas, scale, false);
116
117        canvas->translate(SkIntToScalar(-450), SkIntToScalar(450));
118        showFour(canvas, SK_Scalar1, true);
119        canvas->translate(SkIntToScalar(450), 0);
120        showFour(canvas, scale, true);
121    }
122
123private:
124    typedef GM INHERITED;
125};
126
127//////////////////////////////////////////////////////////////////////////////
128
129static GM* MyFactory(void*) { return new FillTypePerspGM; }
130static GMRegistry reg(MyFactory);
131
132}
133