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#include "SampleCode.h"
8#include "SkView.h"
9#include "SkCanvas.h"
10#include "SkGraphics.h"
11#include "SkPath.h"
12#include "SkRandom.h"
13#include "SkString.h"
14#include "SkTime.h"
15
16class PolyToPolyView : public SampleView {
17public:
18    PolyToPolyView() {
19        // tests
20        {
21            SkPoint src[] = { { 0, 0 },
22                              { SK_Scalar1, 0 },
23                              { 0, SK_Scalar1 } };
24            SkPoint dst[] = { { 0, 0 },
25                              { 2*SK_Scalar1, 0 },
26                              { 0, 2*SK_Scalar1 } };
27            SkMatrix m1, m2;
28
29            (void) m1.setPolyToPoly(src, dst, 3);
30
31            m2.reset();
32            m2.set(SkMatrix::kMScaleX, dst[1].fX - dst[0].fX);
33            m2.set(SkMatrix::kMSkewX,  dst[2].fX - dst[0].fX);
34            m2.set(SkMatrix::kMTransX, dst[0].fX);
35            m2.set(SkMatrix::kMSkewY,  dst[1].fY - dst[0].fY);
36            m2.set(SkMatrix::kMScaleY, dst[2].fY - dst[0].fY);
37            m2.set(SkMatrix::kMTransY, dst[0].fY);
38
39            m1.reset();
40
41            const SkScalar src1[] = {
42                0, 0, 0, 427, 316, 427, 316, 0
43            };
44            const SkScalar dst1[] = {
45                158, 177.5f, 158, 249.5f,
46                158, 604.5f, 158, -177.5f
47            };
48
49            (void) m2.setPolyToPoly((const SkPoint*)src1, (SkPoint*)dst1, 4);
50
51            {
52                const SkPoint src[] = {
53                    { SkIntToScalar(1), SkIntToScalar(0) },
54                    { SkIntToScalar(4), SkIntToScalar(7) },
55                    { SkIntToScalar(10), SkIntToScalar(2) }
56                };
57                const SkPoint dst[] = {
58                    { SkIntToScalar(4), SkIntToScalar(2) },
59                    { SkIntToScalar(45), SkIntToScalar(26) },
60                    { SkIntToScalar(32), SkIntToScalar(17) }
61                };
62
63                SkMatrix m0;
64                m0.setPolyToPoly(src, dst, 3);
65            }
66        }
67    }
68
69protected:
70    // overrides from SkEventSink
71    virtual bool onQuery(SkEvent* evt)  {
72        if (SampleCode::TitleQ(*evt)) {
73            SampleCode::TitleR(evt, "PolyToPolyView");
74            return true;
75        }
76        return this->INHERITED::onQuery(evt);
77    }
78
79    static void doDraw(SkCanvas* canvas, SkPaint* paint, const int isrc[],
80                       const int idst[], int count) {
81        SkMatrix matrix;
82        SkPoint src[4], dst[4];
83
84        for (int i = 0; i < count; i++) {
85            src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1]));
86            dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1]));
87        }
88
89        canvas->save();
90        matrix.setPolyToPoly(src, dst, count);
91        canvas->concat(matrix);
92
93        paint->setColor(SK_ColorGRAY);
94        paint->setStyle(SkPaint::kStroke_Style);
95        const SkScalar D = SkIntToScalar(64);
96        canvas->drawRect(SkRect::MakeWH(D, D), *paint);
97        canvas->drawLine(0, 0, D, D, *paint);
98        canvas->drawLine(0, D, D, 0, *paint);
99
100        SkPaint::FontMetrics fm;
101        paint->getFontMetrics(&fm);
102        paint->setColor(SK_ColorRED);
103        paint->setStyle(SkPaint::kFill_Style);
104        SkScalar x = D/2;
105        float y = D/2 - (fm.fAscent + fm.fDescent)/2;
106        SkString str;
107        str.appendS32(count);
108        canvas->drawString(str,
109                         x, y,
110                         *paint);
111
112        canvas->restore();
113    }
114
115    virtual void onDrawContent(SkCanvas* canvas) {
116        SkPaint paint;
117        paint.setAntiAlias(true);
118        paint.setStrokeWidth(SkIntToScalar(4));
119        paint.setTextSize(SkIntToScalar(40));
120        paint.setTextAlign(SkPaint::kCenter_Align);
121
122        canvas->save();
123        canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
124        // translate (1 point)
125        const int src1[] = { 0, 0 };
126        const int dst1[] = { 5, 5 };
127        doDraw(canvas, &paint, src1, dst1, 1);
128        canvas->restore();
129
130        canvas->save();
131        canvas->translate(SkIntToScalar(160), SkIntToScalar(10));
132        // rotate/uniform-scale (2 points)
133        const int src2[] = { 32, 32, 64, 32 };
134        const int dst2[] = { 32, 32, 64, 48 };
135        doDraw(canvas, &paint, src2, dst2, 2);
136        canvas->restore();
137
138        canvas->save();
139        canvas->translate(SkIntToScalar(10), SkIntToScalar(110));
140        // rotate/skew (3 points)
141        const int src3[] = { 0, 0, 64, 0, 0, 64 };
142        const int dst3[] = { 0, 0, 96, 0, 24, 64 };
143        doDraw(canvas, &paint, src3, dst3, 3);
144        canvas->restore();
145
146        canvas->save();
147        canvas->translate(SkIntToScalar(160), SkIntToScalar(110));
148        // perspective (4 points)
149        const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 };
150        const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 };
151        doDraw(canvas, &paint, src4, dst4, 4);
152        canvas->restore();
153    }
154
155private:
156    typedef SampleView INHERITED;
157};
158
159//////////////////////////////////////////////////////////////////////////////
160
161static SkView* MyFactory() { return new PolyToPolyView; }
162static SkViewRegister reg(MyFactory);
163