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
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            {
54                const SkPoint src[] = {
55                    { SkIntToScalar(1), SkIntToScalar(0) },
56                    { SkIntToScalar(4), SkIntToScalar(7) },
57                    { SkIntToScalar(10), SkIntToScalar(2) }
58                };
59                const SkPoint dst[] = {
60                    { SkIntToScalar(4), SkIntToScalar(2) },
61                    { SkIntToScalar(45), SkIntToScalar(26) },
62                    { SkIntToScalar(32), SkIntToScalar(17) }
63                };
64
65                SkMatrix m0;
66                m0.setPolyToPoly(src, dst, 3);
67              //  SkMatrix m1;
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            SampleCode::TitleR(evt, "PolyToPolyView");
80            return true;
81        }
82        return this->INHERITED::onQuery(evt);
83    }
84
85    static void doDraw(SkCanvas* canvas, SkPaint* paint, const int isrc[],
86                       const int idst[], int count) {
87        SkMatrix matrix;
88        SkPoint src[4], dst[4];
89
90        for (int i = 0; i < count; i++) {
91            src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1]));
92            dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1]));
93        }
94
95        canvas->save();
96        matrix.setPolyToPoly(src, dst, count);
97        canvas->concat(matrix);
98
99        paint->setColor(SK_ColorGRAY);
100        paint->setStyle(SkPaint::kStroke_Style);
101        const SkScalar D = SkIntToScalar(64);
102        canvas->drawRectCoords(0, 0, D, D, *paint);
103        canvas->drawLine(0, 0, D, D, *paint);
104        canvas->drawLine(0, D, D, 0, *paint);
105
106        SkPaint::FontMetrics fm;
107        paint->getFontMetrics(&fm);
108        paint->setColor(SK_ColorRED);
109        paint->setStyle(SkPaint::kFill_Style);
110        SkScalar x = D/2;
111        float y = D/2 - (fm.fAscent + fm.fDescent)/2;
112        SkString str;
113        str.appendS32(count);
114        canvas->drawText(str.c_str(), str.size(),
115                         x, y,
116                         *paint);
117
118        canvas->restore();
119    }
120
121    virtual void onDrawContent(SkCanvas* canvas) {
122        SkPaint paint;
123        paint.setAntiAlias(true);
124        paint.setStrokeWidth(SkIntToScalar(4));
125        paint.setTextSize(SkIntToScalar(40));
126        paint.setTextAlign(SkPaint::kCenter_Align);
127
128        canvas->save();
129        canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
130        // translate (1 point)
131        const int src1[] = { 0, 0 };
132        const int dst1[] = { 5, 5 };
133        doDraw(canvas, &paint, src1, dst1, 1);
134        canvas->restore();
135
136        canvas->save();
137        canvas->translate(SkIntToScalar(160), SkIntToScalar(10));
138        // rotate/uniform-scale (2 points)
139        const int src2[] = { 32, 32, 64, 32 };
140        const int dst2[] = { 32, 32, 64, 48 };
141        doDraw(canvas, &paint, src2, dst2, 2);
142        canvas->restore();
143
144        canvas->save();
145        canvas->translate(SkIntToScalar(10), SkIntToScalar(110));
146        // rotate/skew (3 points)
147        const int src3[] = { 0, 0, 64, 0, 0, 64 };
148        const int dst3[] = { 0, 0, 96, 0, 24, 64 };
149        doDraw(canvas, &paint, src3, dst3, 3);
150        canvas->restore();
151
152        canvas->save();
153        canvas->translate(SkIntToScalar(160), SkIntToScalar(110));
154        // perspective (4 points)
155        const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 };
156        const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 };
157        doDraw(canvas, &paint, src4, dst4, 4);
158        canvas->restore();
159    }
160
161private:
162    typedef SampleView INHERITED;
163};
164
165//////////////////////////////////////////////////////////////////////////////
166
167static SkView* MyFactory() { return new PolyToPolyView; }
168static SkViewRegister reg(MyFactory);
169