SamplePolyToPoly.cpp revision 8a1c16ff38322f0210116fa7293eb8817c7e477e 
1#include "SampleCode.h"
2#include "SkView.h"
3#include "SkCanvas.h"
4#include "SkGraphics.h"
5#include "SkPath.h"
6#include "SkRandom.h"
7#include "SkTime.h"
8
9extern bool SkSetPoly3To3(SkMatrix* matrix, const SkPoint src[3], const SkPoint dst[3]);
10
11class PolyToPolyView : public SkView {
12public:
13	PolyToPolyView() {
14        // tests
15        {
16            SkPoint src[] = { 0, 0, SK_Scalar1, 0, 0, SK_Scalar1 };
17            SkPoint dst[] = { 0, 0, 2*SK_Scalar1, 0, 0, 2*SK_Scalar1 };
18            SkMatrix m1, m2;
19            bool success;
20
21            success = m1.setPolyToPoly(src, dst, 3);
22            SkDebugf("--- setPolyToPoly1 %d\n", success);
23
24            m2.reset();
25            m2.set(SkMatrix::kMScaleX, dst[1].fX - dst[0].fX);
26            m2.set(SkMatrix::kMSkewX,  dst[2].fX - dst[0].fX);
27            m2.set(SkMatrix::kMTransX, dst[0].fX);
28            m2.set(SkMatrix::kMSkewY,  dst[1].fY - dst[0].fY);
29            m2.set(SkMatrix::kMScaleY, dst[2].fY - dst[0].fY);
30            m2.set(SkMatrix::kMTransY, dst[0].fY);
31
32            m1.reset();
33
34            const SkScalar src1[] = {
35                0, 0, 0, SkFloatToScalar(427), SkFloatToScalar(316), SkFloatToScalar(427), SkFloatToScalar(316), 0
36            };
37            const SkScalar dst1[] = {
38                SkFloatToScalar(158), SkFloatToScalar(177.5f), SkFloatToScalar(158), SkFloatToScalar(249.5f),
39                SkFloatToScalar(158), SkFloatToScalar(604.5f), SkFloatToScalar(158), SkFloatToScalar(-177.5f)
40            };
41
42            success = m2.setPolyToPoly((const SkPoint*)src1, (SkPoint*)dst1, 4);
43            SkDebugf("--- setPolyToPoly2 %d\n", success);
44
45            {
46                const SkPoint src[] = {
47                    SkIntToScalar(1), SkIntToScalar(0),
48                    SkIntToScalar(4), SkIntToScalar(7),
49                    SkIntToScalar(10), SkIntToScalar(2)
50                };
51                const SkPoint dst[] = {
52                    SkIntToScalar(4), SkIntToScalar(2),
53                    SkIntToScalar(45), SkIntToScalar(26),
54                    SkIntToScalar(32), SkIntToScalar(17)
55                };
56
57                SkMatrix m0, m1;
58                m0.setPolyToPoly(src, dst, 3);
59                SkSetPoly3To3(&m1, src, dst);
60                m0.dump();
61                m1.dump();
62            }
63        }
64    }
65
66protected:
67    // overrides from SkEventSink
68    virtual bool onQuery(SkEvent* evt)  {
69        if (SampleCode::TitleQ(*evt)) {
70            SkString str("PolyToPolyView");
71            SampleCode::TitleR(evt, str.c_str());
72            return true;
73        }
74        return this->INHERITED::onQuery(evt);
75    }
76
77    void drawBG(SkCanvas* canvas) {
78        canvas->drawColor(SK_ColorWHITE);
79    }
80
81    static void doDraw(SkCanvas* canvas, SkPaint* paint, const int isrc[],
82                       const int idst[], int count) {
83        SkMatrix matrix;
84        SkPoint src[4], dst[4];
85
86        for (int i = 0; i < count; i++) {
87            src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1]));
88            dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1]));
89        }
90
91        canvas->save();
92        matrix.setPolyToPoly(src, dst, count);
93        canvas->concat(matrix);
94
95        paint->setColor(SK_ColorGRAY);
96        paint->setStyle(SkPaint::kStroke_Style);
97        const SkScalar D = SkIntToScalar(64);
98        canvas->drawRectCoords(0, 0, D, D, *paint);
99        canvas->drawLine(0, 0, D, D, *paint);
100        canvas->drawLine(0, D, D, 0, *paint);
101
102        SkPaint::FontMetrics fm;
103        paint->getFontMetrics(&fm);
104        paint->setColor(SK_ColorRED);
105        paint->setStyle(SkPaint::kFill_Style);
106        SkScalar x = D/2;
107        float y = D/2 - (fm.fAscent + fm.fDescent)/2;
108        SkString str;
109        str.appendS32(count);
110        canvas->drawText(str.c_str(), str.size(), x, y, *paint);
111
112        canvas->restore();
113    }
114
115    virtual void onDraw(SkCanvas* canvas) {
116        this->drawBG(canvas);
117
118        SkPaint paint;
119        paint.setAntiAlias(true);
120        paint.setStrokeWidth(SkIntToScalar(4));
121        paint.setTextSize(SkIntToScalar(40));
122        paint.setTextAlign(SkPaint::kCenter_Align);
123
124        canvas->save();
125        canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
126        // translate (1 point)
127        const int src1[] = { 0, 0 };
128        const int dst1[] = { 5, 5 };
129        doDraw(canvas, &paint, src1, dst1, 1);
130        canvas->restore();
131
132        canvas->save();
133        canvas->translate(SkIntToScalar(160), SkIntToScalar(10));
134        // rotate/uniform-scale (2 points)
135        const int src2[] = { 32, 32, 64, 32 };
136        const int dst2[] = { 32, 32, 64, 48 };
137        doDraw(canvas, &paint, src2, dst2, 2);
138        canvas->restore();
139
140        canvas->save();
141        canvas->translate(SkIntToScalar(10), SkIntToScalar(110));
142        // rotate/skew (3 points)
143        const int src3[] = { 0, 0, 64, 0, 0, 64 };
144        const int dst3[] = { 0, 0, 96, 0, 24, 64 };
145        doDraw(canvas, &paint, src3, dst3, 3);
146        canvas->restore();
147
148        canvas->save();
149        canvas->translate(SkIntToScalar(160), SkIntToScalar(110));
150        // perspective (4 points)
151        const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 };
152        const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 };
153        doDraw(canvas, &paint, src4, dst4, 4);
154        canvas->restore();
155    }
156
157private:
158    typedef SkView INHERITED;
159};
160
161//////////////////////////////////////////////////////////////////////////////
162
163static SkView* MyFactory() { return new PolyToPolyView; }
164static SkViewRegister reg(MyFactory);
165
166