poly2poly.cpp revision 72e49b8982586a5d8b0425f16d909c05a36ea8c3 
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    void drawBG(SkCanvas* canvas) {
26        canvas->drawColor(SK_ColorWHITE);
27    }
28
29    static void doDraw(SkCanvas* canvas, SkPaint* paint, const int isrc[],
30                       const int idst[], int count) {
31        SkMatrix matrix;
32        SkPoint src[4], dst[4];
33
34        for (int i = 0; i < count; i++) {
35            src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1]));
36            dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1]));
37        }
38
39        canvas->save();
40        matrix.setPolyToPoly(src, dst, count);
41        canvas->concat(matrix);
42
43        paint->setColor(SK_ColorGRAY);
44        paint->setStyle(SkPaint::kStroke_Style);
45        const SkScalar D = SkIntToScalar(64);
46        canvas->drawRectCoords(0, 0, D, D, *paint);
47        canvas->drawLine(0, 0, D, D, *paint);
48        canvas->drawLine(0, D, D, 0, *paint);
49
50        SkPaint::FontMetrics fm;
51        paint->getFontMetrics(&fm);
52        paint->setColor(SK_ColorRED);
53        paint->setStyle(SkPaint::kFill_Style);
54        SkScalar x = D/2;
55        SkScalar y = D/2 - (fm.fAscent + fm.fDescent)/2;
56        SkString str;
57        str.appendS32(count);
58        canvas->drawText(str.c_str(), str.size(), x, y, *paint);
59
60        canvas->restore();
61    }
62
63    virtual void onDraw(SkCanvas* canvas) {
64        this->drawBG(canvas);
65
66        SkPaint paint;
67        paint.setAntiAlias(true);
68        paint.setStrokeWidth(SkIntToScalar(4));
69        paint.setTextSize(SkIntToScalar(40));
70        paint.setTextAlign(SkPaint::kCenter_Align);
71
72        canvas->save();
73        canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
74        // translate (1 point)
75        const int src1[] = { 0, 0 };
76        const int dst1[] = { 5, 5 };
77        doDraw(canvas, &paint, src1, dst1, 1);
78        canvas->restore();
79
80        canvas->save();
81        canvas->translate(SkIntToScalar(160), SkIntToScalar(10));
82        // rotate/uniform-scale (2 points)
83        const int src2[] = { 32, 32, 64, 32 };
84        const int dst2[] = { 32, 32, 64, 48 };
85        doDraw(canvas, &paint, src2, dst2, 2);
86        canvas->restore();
87
88        canvas->save();
89        canvas->translate(SkIntToScalar(10), SkIntToScalar(110));
90        // rotate/skew (3 points)
91        const int src3[] = { 0, 0, 64, 0, 0, 64 };
92        const int dst3[] = { 0, 0, 96, 0, 24, 64 };
93        doDraw(canvas, &paint, src3, dst3, 3);
94        canvas->restore();
95
96        canvas->save();
97        canvas->translate(SkIntToScalar(160), SkIntToScalar(110));
98        // perspective (4 points)
99        const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 };
100        const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 };
101        doDraw(canvas, &paint, src4, dst4, 4);
102        canvas->restore();
103    }
104
105private:
106    typedef GM INHERITED;
107};
108
109//////////////////////////////////////////////////////////////////////////////
110
111static GM* MyFactory(void*) { return new Poly2PolyGM; }
112static GMRegistry reg(MyFactory);
113
114}
115
116