SamplePolyToPoly.cpp revision ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976e 
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 "SampleCode.h"
9#include "SkView.h"
10#include "SkCanvas.h"
11#include "SkGraphics.h"
12#include "SkPath.h"
13#include "SkRandom.h"
14#include "SkTime.h"
15
16extern bool SkSetPoly3To3(SkMatrix* matrix, const SkPoint src[3], const SkPoint dst[3]);
17
18class PolyToPolyView : public SampleView {
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            bool success;
31
32            success = m1.setPolyToPoly(src, dst, 3);
33
34            m2.reset();
35            m2.set(SkMatrix::kMScaleX, dst[1].fX - dst[0].fX);
36            m2.set(SkMatrix::kMSkewX,  dst[2].fX - dst[0].fX);
37            m2.set(SkMatrix::kMTransX, dst[0].fX);
38            m2.set(SkMatrix::kMSkewY,  dst[1].fY - dst[0].fY);
39            m2.set(SkMatrix::kMScaleY, dst[2].fY - dst[0].fY);
40            m2.set(SkMatrix::kMTransY, dst[0].fY);
41
42            m1.reset();
43
44            const SkScalar src1[] = {
45                0, 0, 0, SkFloatToScalar(427), SkFloatToScalar(316), SkFloatToScalar(427), SkFloatToScalar(316), 0
46            };
47            const SkScalar dst1[] = {
48                SkFloatToScalar(158), SkFloatToScalar(177.5f), SkFloatToScalar(158), SkFloatToScalar(249.5f),
49                SkFloatToScalar(158), SkFloatToScalar(604.5f), SkFloatToScalar(158), SkFloatToScalar(-177.5f)
50            };
51
52            success = m2.setPolyToPoly((const SkPoint*)src1, (SkPoint*)dst1, 4);
53
54            {
55                const SkPoint src[] = {
56                    { SkIntToScalar(1), SkIntToScalar(0) },
57                    { SkIntToScalar(4), SkIntToScalar(7) },
58                    { SkIntToScalar(10), SkIntToScalar(2) }
59                };
60                const SkPoint dst[] = {
61                    { SkIntToScalar(4), SkIntToScalar(2) },
62                    { SkIntToScalar(45), SkIntToScalar(26) },
63                    { SkIntToScalar(32), SkIntToScalar(17) }
64                };
65
66                SkMatrix m0, m1;
67                m0.setPolyToPoly(src, dst, 3);
68              //  SkSetPoly3To3(&m1, src, dst);
69              //  m0.dump();
70              //  m1.dump();
71            }
72        }
73    }
74
75protected:
76    // overrides from SkEventSink
77    virtual bool onQuery(SkEvent* evt)  {
78        if (SampleCode::TitleQ(*evt)) {
79            SkString str("PolyToPolyView");
80            SampleCode::TitleR(evt, str.c_str());
81            return true;
82        }
83        return this->INHERITED::onQuery(evt);
84    }
85
86    static void doDraw(SkCanvas* canvas, SkPaint* paint, const int isrc[],
87                       const int idst[], int count) {
88        SkMatrix matrix;
89        SkPoint src[4], dst[4];
90
91        for (int i = 0; i < count; i++) {
92            src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1]));
93            dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1]));
94        }
95
96        canvas->save();
97        matrix.setPolyToPoly(src, dst, count);
98        canvas->concat(matrix);
99
100        paint->setColor(SK_ColorGRAY);
101        paint->setStyle(SkPaint::kStroke_Style);
102        const SkScalar D = SkIntToScalar(64);
103        canvas->drawRectCoords(0, 0, D, D, *paint);
104        canvas->drawLine(0, 0, D, D, *paint);
105        canvas->drawLine(0, D, D, 0, *paint);
106
107        SkPaint::FontMetrics fm;
108        paint->getFontMetrics(&fm);
109        paint->setColor(SK_ColorRED);
110        paint->setStyle(SkPaint::kFill_Style);
111        SkScalar x = D/2;
112        float y = D/2 - (fm.fAscent + fm.fDescent)/2;
113        SkString str;
114        str.appendS32(count);
115        canvas->drawText(str.c_str(), str.size(), x, y, *paint);
116
117        canvas->restore();
118    }
119
120    virtual void onDrawContent(SkCanvas* canvas) {
121        SkPaint paint;
122        paint.setAntiAlias(true);
123        paint.setStrokeWidth(SkIntToScalar(4));
124        paint.setTextSize(SkIntToScalar(40));
125        paint.setTextAlign(SkPaint::kCenter_Align);
126
127        canvas->save();
128        canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
129        // translate (1 point)
130        const int src1[] = { 0, 0 };
131        const int dst1[] = { 5, 5 };
132        doDraw(canvas, &paint, src1, dst1, 1);
133        canvas->restore();
134
135        canvas->save();
136        canvas->translate(SkIntToScalar(160), SkIntToScalar(10));
137        // rotate/uniform-scale (2 points)
138        const int src2[] = { 32, 32, 64, 32 };
139        const int dst2[] = { 32, 32, 64, 48 };
140        doDraw(canvas, &paint, src2, dst2, 2);
141        canvas->restore();
142
143        canvas->save();
144        canvas->translate(SkIntToScalar(10), SkIntToScalar(110));
145        // rotate/skew (3 points)
146        const int src3[] = { 0, 0, 64, 0, 0, 64 };
147        const int dst3[] = { 0, 0, 96, 0, 24, 64 };
148        doDraw(canvas, &paint, src3, dst3, 3);
149        canvas->restore();
150
151        canvas->save();
152        canvas->translate(SkIntToScalar(160), SkIntToScalar(110));
153        // perspective (4 points)
154        const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 };
155        const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 };
156        doDraw(canvas, &paint, src4, dst4, 4);
157        canvas->restore();
158    }
159
160private:
161    typedef SampleView INHERITED;
162};
163
164//////////////////////////////////////////////////////////////////////////////
165
166static SkView* MyFactory() { return new PolyToPolyView; }
167static SkViewRegister reg(MyFactory);
168
169