aboutsummaryrefslogtreecommitdiffhomepage
path: root/samplecode/SamplePolyToPoly.cpp
blob: 88adae9d9788e6a83d1c627296ca3ab35c6604d5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170

/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkGraphics.h"
#include "SkPath.h"
#include "SkRandom.h"
#include "SkTime.h"

extern bool SkSetPoly3To3(SkMatrix* matrix, const SkPoint src[3], const SkPoint dst[3]);

class PolyToPolyView : public SampleView {
public:
    PolyToPolyView() {
        // tests
        {
            SkPoint src[] = { { 0, 0 },
                              { SK_Scalar1, 0 },
                              { 0, SK_Scalar1 } };
            SkPoint dst[] = { { 0, 0 },
                              { 2*SK_Scalar1, 0 },
                              { 0, 2*SK_Scalar1 } };
            SkMatrix m1, m2;
            bool success;

            success = m1.setPolyToPoly(src, dst, 3);

            m2.reset();
            m2.set(SkMatrix::kMScaleX, dst[1].fX - dst[0].fX);
            m2.set(SkMatrix::kMSkewX,  dst[2].fX - dst[0].fX);
            m2.set(SkMatrix::kMTransX, dst[0].fX);
            m2.set(SkMatrix::kMSkewY,  dst[1].fY - dst[0].fY);
            m2.set(SkMatrix::kMScaleY, dst[2].fY - dst[0].fY);
            m2.set(SkMatrix::kMTransY, dst[0].fY);

            m1.reset();

            const SkScalar src1[] = {
                0, 0, 0, SkFloatToScalar(427), SkFloatToScalar(316), SkFloatToScalar(427), SkFloatToScalar(316), 0
            };
            const SkScalar dst1[] = {
                SkFloatToScalar(158), SkFloatToScalar(177.5f), SkFloatToScalar(158), SkFloatToScalar(249.5f),
                SkFloatToScalar(158), SkFloatToScalar(604.5f), SkFloatToScalar(158), SkFloatToScalar(-177.5f)
            };

            success = m2.setPolyToPoly((const SkPoint*)src1, (SkPoint*)dst1, 4);

            {
                const SkPoint src[] = {
                    { SkIntToScalar(1), SkIntToScalar(0) },
                    { SkIntToScalar(4), SkIntToScalar(7) },
                    { SkIntToScalar(10), SkIntToScalar(2) }
                };
                const SkPoint dst[] = {
                    { SkIntToScalar(4), SkIntToScalar(2) },
                    { SkIntToScalar(45), SkIntToScalar(26) },
                    { SkIntToScalar(32), SkIntToScalar(17) }
                };

                SkMatrix m0;
                m0.setPolyToPoly(src, dst, 3);
              //  SkMatrix m1;
              //  SkSetPoly3To3(&m1, src, dst);
              //  m0.dump();
              //  m1.dump();
            }
        }
    }

protected:
    // overrides from SkEventSink
    virtual bool onQuery(SkEvent* evt)  {
        if (SampleCode::TitleQ(*evt)) {
            SampleCode::TitleR(evt, "PolyToPolyView");
            return true;
        }
        return this->INHERITED::onQuery(evt);
    }

    static void doDraw(SkCanvas* canvas, SkPaint* paint, const int isrc[],
                       const int idst[], int count) {
        SkMatrix matrix;
        SkPoint src[4], dst[4];

        for (int i = 0; i < count; i++) {
            src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1]));
            dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1]));
        }

        canvas->save();
        matrix.setPolyToPoly(src, dst, count);
        canvas->concat(matrix);

        paint->setColor(SK_ColorGRAY);
        paint->setStyle(SkPaint::kStroke_Style);
        const SkScalar D = SkIntToScalar(64);
        canvas->drawRectCoords(0, 0, D, D, *paint);
        canvas->drawLine(0, 0, D, D, *paint);
        canvas->drawLine(0, D, D, 0, *paint);

        SkPaint::FontMetrics fm;
        paint->getFontMetrics(&fm);
        paint->setColor(SK_ColorRED);
        paint->setStyle(SkPaint::kFill_Style);
        SkScalar x = D/2;
        float y = D/2 - (fm.fAscent + fm.fDescent)/2;
        SkString str;
        str.appendS32(count);
        canvas->drawText(str.c_str(), str.size(),
                         x, SkFloatToScalar(y),
                         *paint);

        canvas->restore();
    }

    virtual void onDrawContent(SkCanvas* canvas) {
        SkPaint paint;
        paint.setAntiAlias(true);
        paint.setStrokeWidth(SkIntToScalar(4));
        paint.setTextSize(SkIntToScalar(40));
        paint.setTextAlign(SkPaint::kCenter_Align);

        canvas->save();
        canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
        // translate (1 point)
        const int src1[] = { 0, 0 };
        const int dst1[] = { 5, 5 };
        doDraw(canvas, &paint, src1, dst1, 1);
        canvas->restore();

        canvas->save();
        canvas->translate(SkIntToScalar(160), SkIntToScalar(10));
        // rotate/uniform-scale (2 points)
        const int src2[] = { 32, 32, 64, 32 };
        const int dst2[] = { 32, 32, 64, 48 };
        doDraw(canvas, &paint, src2, dst2, 2);
        canvas->restore();

        canvas->save();
        canvas->translate(SkIntToScalar(10), SkIntToScalar(110));
        // rotate/skew (3 points)
        const int src3[] = { 0, 0, 64, 0, 0, 64 };
        const int dst3[] = { 0, 0, 96, 0, 24, 64 };
        doDraw(canvas, &paint, src3, dst3, 3);
        canvas->restore();

        canvas->save();
        canvas->translate(SkIntToScalar(160), SkIntToScalar(110));
        // perspective (4 points)
        const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 };
        const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 };
        doDraw(canvas, &paint, src4, dst4, 4);
        canvas->restore();
    }

private:
    typedef SampleView INHERITED;
};

//////////////////////////////////////////////////////////////////////////////

static SkView* MyFactory() { return new PolyToPolyView; }
static SkViewRegister reg(MyFactory);