poly2poly.cpp revision d6176b0dcacb124539e0cfd051e6d93a9782f020 
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 "gm.h"
9
10namespace skiagm {
11
12class Poly2PolyGM : public GM {
13public:
14    Poly2PolyGM() {}
15
16protected:
17    virtual SkString onShortName() {
18        return SkString("poly2poly");
19    }
20
21    virtual SkISize onISize() {
22        return make_isize(835, 840);
23    }
24
25    static void doDraw(SkCanvas* canvas, SkPaint* paint, const int isrc[],
26                       const int idst[], int count) {
27        SkMatrix matrix;
28        SkPoint src[4], dst[4];
29
30        for (int i = 0; i < count; i++) {
31            src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1]));
32            dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1]));
33        }
34
35        canvas->save();
36        matrix.setPolyToPoly(src, dst, count);
37        canvas->concat(matrix);
38
39        paint->setColor(SK_ColorGRAY);
40        paint->setStyle(SkPaint::kStroke_Style);
41        const SkScalar D = SkIntToScalar(64);
42        canvas->drawRectCoords(0, 0, D, D, *paint);
43        canvas->drawLine(0, 0, D, D, *paint);
44        canvas->drawLine(0, D, D, 0, *paint);
45
46        SkPaint::FontMetrics fm;
47        paint->getFontMetrics(&fm);
48        paint->setColor(SK_ColorRED);
49        paint->setStyle(SkPaint::kFill_Style);
50        SkScalar x = D/2;
51        SkScalar y = D/2 - (fm.fAscent + fm.fDescent)/2;
52        SkString str;
53        str.appendS32(count);
54        canvas->drawText(str.c_str(), str.size(), x, y, *paint);
55
56        canvas->restore();
57    }
58
59    virtual void onDraw(SkCanvas* canvas) {
60        SkPaint paint;
61        paint.setAntiAlias(true);
62        paint.setStrokeWidth(SkIntToScalar(4));
63        paint.setTextSize(SkIntToScalar(40));
64        paint.setTextAlign(SkPaint::kCenter_Align);
65
66        canvas->save();
67        canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
68        // translate (1 point)
69        const int src1[] = { 0, 0 };
70        const int dst1[] = { 5, 5 };
71        doDraw(canvas, &paint, src1, dst1, 1);
72        canvas->restore();
73
74        canvas->save();
75        canvas->translate(SkIntToScalar(160), SkIntToScalar(10));
76        // rotate/uniform-scale (2 points)
77        const int src2[] = { 32, 32, 64, 32 };
78        const int dst2[] = { 32, 32, 64, 48 };
79        doDraw(canvas, &paint, src2, dst2, 2);
80        canvas->restore();
81
82        canvas->save();
83        canvas->translate(SkIntToScalar(10), SkIntToScalar(110));
84        // rotate/skew (3 points)
85        const int src3[] = { 0, 0, 64, 0, 0, 64 };
86        const int dst3[] = { 0, 0, 96, 0, 24, 64 };
87        doDraw(canvas, &paint, src3, dst3, 3);
88        canvas->restore();
89
90        canvas->save();
91        canvas->translate(SkIntToScalar(160), SkIntToScalar(110));
92        // perspective (4 points)
93        const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 };
94        const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 };
95        doDraw(canvas, &paint, src4, dst4, 4);
96        canvas->restore();
97    }
98
99private:
100    typedef GM INHERITED;
101};
102
103//////////////////////////////////////////////////////////////////////////////
104
105static GM* MyFactory(void*) { return new Poly2PolyGM; }
106static GMRegistry reg(MyFactory);
107
108}
109
110