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 "include/core/SkCanvas.h"
9#include "include/core/SkFontMetrics.h"
10#include "include/core/SkGraphics.h"
11#include "include/core/SkPath.h"
12#include "include/core/SkString.h"
13#include "include/core/SkTime.h"
14#include "include/utils/SkRandom.h"
15#include "include/utils/SkTextUtils.h"
16#include "samplecode/Sample.h"
17
18class PolyToPolyView : public Sample {
19public:
20    PolyToPolyView() {
21        // tests
22        {
23            SkPoint src[] = { { 0, 0 },
24                              { SK_Scalar1, 0 },
25                              { 0, SK_Scalar1 } };
26            SkPoint dst[] = { { 0, 0 },
27                              { 2*SK_Scalar1, 0 },
28                              { 0, 2*SK_Scalar1 } };
29            SkMatrix m1, m2;
30
31            (void) m1.setPolyToPoly(src, dst, 3);
32
33            m2.reset();
34            m2.set(SkMatrix::kMScaleX, dst[1].fX - dst[0].fX);
35            m2.set(SkMatrix::kMSkewX,  dst[2].fX - dst[0].fX);
36            m2.set(SkMatrix::kMTransX, dst[0].fX);
37            m2.set(SkMatrix::kMSkewY,  dst[1].fY - dst[0].fY);
38            m2.set(SkMatrix::kMScaleY, dst[2].fY - dst[0].fY);
39            m2.set(SkMatrix::kMTransY, dst[0].fY);
40
41            m1.reset();
42
43            const SkScalar src1[] = {
44                0, 0, 0, 427, 316, 427, 316, 0
45            };
46            const SkScalar dst1[] = {
47                158, 177.5f, 158, 249.5f,
48                158, 604.5f, 158, -177.5f
49            };
50
51            (void) m2.setPolyToPoly((const SkPoint*)src1, (SkPoint*)dst1, 4);
52
53            const SkPoint src2[] = {
54                { SkIntToScalar(1), SkIntToScalar(0) },
55                { SkIntToScalar(4), SkIntToScalar(7) },
56                { SkIntToScalar(10), SkIntToScalar(2) }
57            };
58            const SkPoint dst2[] = {
59                { SkIntToScalar(4), SkIntToScalar(2) },
60                { SkIntToScalar(45), SkIntToScalar(26) },
61                { SkIntToScalar(32), SkIntToScalar(17) }
62            };
63
64            SkMatrix m0;
65            m0.setPolyToPoly(src2, dst2, 3);
66        }
67    }
68
69protected:
70    SkString name() override { return SkString("PolyToPolyView"); }
71
72    static void doDraw(SkCanvas* canvas, SkPaint* paint, const SkFont& font, const int isrc[],
73                       const int idst[], int count) {
74        SkMatrix matrix;
75        SkPoint src[4], dst[4];
76
77        for (int i = 0; i < count; i++) {
78            src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1]));
79            dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1]));
80        }
81
82        canvas->save();
83        matrix.setPolyToPoly(src, dst, count);
84        canvas->concat(matrix);
85
86        paint->setColor(SK_ColorGRAY);
87        paint->setStyle(SkPaint::kStroke_Style);
88        const SkScalar D = SkIntToScalar(64);
89        canvas->drawRect(SkRect::MakeWH(D, D), *paint);
90        canvas->drawLine(0, 0, D, D, *paint);
91        canvas->drawLine(0, D, D, 0, *paint);
92
93        SkFontMetrics fm;
94        font.getMetrics(&fm);
95        paint->setColor(SK_ColorRED);
96        paint->setStyle(SkPaint::kFill_Style);
97        SkScalar x = D/2;
98        float y = D/2 - (fm.fAscent + fm.fDescent)/2;
99        SkString str;
100        str.appendS32(count);
101        SkTextUtils::DrawString(canvas, str.c_str(), x, y, font, *paint, SkTextUtils::kCenter_Align);
102
103        canvas->restore();
104    }
105
106    void onDrawContent(SkCanvas* canvas) override {
107        SkPaint paint;
108        paint.setAntiAlias(true);
109        paint.setStrokeWidth(SkIntToScalar(4));
110
111        SkFont font;
112        font.setSize(40);
113
114        canvas->save();
115        canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
116        // translate (1 point)
117        const int src1[] = { 0, 0 };
118        const int dst1[] = { 5, 5 };
119        doDraw(canvas, &paint, font, src1, dst1, 1);
120        canvas->restore();
121
122        canvas->save();
123        canvas->translate(SkIntToScalar(160), SkIntToScalar(10));
124        // rotate/uniform-scale (2 points)
125        const int src2[] = { 32, 32, 64, 32 };
126        const int dst2[] = { 32, 32, 64, 48 };
127        doDraw(canvas, &paint, font, src2, dst2, 2);
128        canvas->restore();
129
130        canvas->save();
131        canvas->translate(SkIntToScalar(10), SkIntToScalar(110));
132        // rotate/skew (3 points)
133        const int src3[] = { 0, 0, 64, 0, 0, 64 };
134        const int dst3[] = { 0, 0, 96, 0, 24, 64 };
135        doDraw(canvas, &paint, font, src3, dst3, 3);
136        canvas->restore();
137
138        canvas->save();
139        canvas->translate(SkIntToScalar(160), SkIntToScalar(110));
140        // perspective (4 points)
141        const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 };
142        const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 };
143        doDraw(canvas, &paint, font, src4, dst4, 4);
144        canvas->restore();
145    }
146
147private:
148    using INHERITED = Sample;
149};
150
151//////////////////////////////////////////////////////////////////////////////
152
153DEF_SAMPLE( return new PolyToPolyView(); )
154