filltypespersp.cpp revision a90c6803865766d28e92091f56f718f5e41fe80f 
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    virtual uint32_t onGetFlags() const SK_OVERRIDE {
28        return kSkipTiled_Flag;
29    }
30
31    virtual SkString onShortName() {
32        return SkString("filltypespersp");
33    }
34
35    virtual SkISize onISize() {
36        return make_isize(835, 840);
37    }
38
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
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
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
128private:
129    typedef GM INHERITED;
130};
131
132//////////////////////////////////////////////////////////////////////////////
133
134static GM* MyFactory(void*) { return new FillTypePerspGM; }
135static GMRegistry reg(MyFactory);
136
137}
138