xref: /third_party/skia/gm/linepaths.cpp (revision cb93a386) 
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
8#include "gm/gm.h"
9#include "include/core/SkCanvas.h"
10#include "include/core/SkColor.h"
11#include "include/core/SkFont.h"
12#include "include/core/SkPaint.h"
13#include "include/core/SkPath.h"
14#include "include/core/SkRect.h"
15#include "include/core/SkScalar.h"
16#include "include/core/SkTypeface.h"
17#include "include/core/SkTypes.h"
18#include "include/utils/SkRandom.h"
19#include "tools/ToolUtils.h"
20
21static void drawPath(SkPath& path,SkCanvas* canvas,SkColor color,
22                     const SkRect& clip,SkPaint::Cap cap, SkPaint::Join join,
23                     SkPaint::Style style, SkPathFillType fill,
24                     SkScalar strokeWidth) {
25        path.setFillType(fill);
26        SkPaint paint;
27        paint.setStrokeCap(cap);
28        paint.setStrokeWidth(strokeWidth);
29        paint.setStrokeJoin(join);
30        paint.setColor(color);
31        paint.setStyle(style);
32        canvas->save();
33        canvas->clipRect(clip);
34        canvas->drawPath(path, paint);
35        canvas->restore();
36}
37
38static void draw(SkCanvas* canvas, bool doClose) {
39        struct FillAndName {
40            SkPathFillType fFill;
41            const char*      fName;
42        };
43        constexpr FillAndName gFills[] = {
44            {SkPathFillType::kWinding, "Winding"},
45            {SkPathFillType::kEvenOdd, "Even / Odd"},
46            {SkPathFillType::kInverseWinding, "Inverse Winding"},
47            {SkPathFillType::kInverseEvenOdd, "Inverse Even / Odd"},
48        };
49        struct StyleAndName {
50            SkPaint::Style fStyle;
51            const char*    fName;
52        };
53        constexpr StyleAndName gStyles[] = {
54            {SkPaint::kFill_Style, "Fill"},
55            {SkPaint::kStroke_Style, "Stroke"},
56            {SkPaint::kStrokeAndFill_Style, "Stroke And Fill"},
57        };
58        struct CapAndName {
59            SkPaint::Cap  fCap;
60            SkPaint::Join fJoin;
61            const char*   fName;
62        };
63        constexpr CapAndName gCaps[] = {
64            {SkPaint::kButt_Cap, SkPaint::kBevel_Join, "Butt"},
65            {SkPaint::kRound_Cap, SkPaint::kRound_Join, "Round"},
66            {SkPaint::kSquare_Cap, SkPaint::kBevel_Join, "Square"}
67        };
68        struct PathAndName {
69            SkPath      fPath;
70            const char* fName;
71        };
72        PathAndName path;
73        path.fPath.moveTo(25*SK_Scalar1, 15*SK_Scalar1);
74        path.fPath.lineTo(75*SK_Scalar1, 15*SK_Scalar1);
75        if (doClose) {
76            path.fPath.close();
77            path.fName = "moveTo-line-close";
78        } else {
79            path.fName = "moveTo-line";
80        }
81
82        SkPaint titlePaint;
83        titlePaint.setColor(SK_ColorBLACK);
84        titlePaint.setAntiAlias(true);
85
86        SkFont font(ToolUtils::create_portable_typeface(), 15.0f);
87
88        const char titleNoClose[] = "Line Drawn Into Rectangle Clips With "
89            "Indicated Style, Fill and Linecaps, with stroke width 10";
90        const char titleClose[] = "Line Closed Drawn Into Rectangle Clips With "
91            "Indicated Style, Fill and Linecaps, with stroke width 10";
92        const char* title = doClose ? titleClose : titleNoClose;
93        canvas->drawString(title, 20.0f, 20.0f, font, titlePaint);
94
95        SkRandom rand;
96        SkRect rect = SkRect::MakeWH(100*SK_Scalar1, 30*SK_Scalar1);
97        canvas->save();
98        canvas->translate(10 * SK_Scalar1, 30 * SK_Scalar1);
99        canvas->save();
100        for (size_t cap = 0; cap < SK_ARRAY_COUNT(gCaps); ++cap) {
101            if (0 < cap) {
102                canvas->translate((rect.width() + 40 * SK_Scalar1) * SK_ARRAY_COUNT(gStyles), 0);
103            }
104            canvas->save();
105            for (size_t fill = 0; fill < SK_ARRAY_COUNT(gFills); ++fill) {
106                if (0 < fill) {
107                    canvas->translate(0, rect.height() + 40 * SK_Scalar1);
108                }
109                canvas->save();
110                for (size_t style = 0; style < SK_ARRAY_COUNT(gStyles); ++style) {
111                    if (0 < style) {
112                        canvas->translate(rect.width() + 40 * SK_Scalar1, 0);
113                    }
114
115                    SkColor color = ToolUtils::color_to_565(0xff007000);
116                    drawPath(path.fPath, canvas, color, rect,
117                                    gCaps[cap].fCap, gCaps[cap].fJoin, gStyles[style].fStyle,
118                                    gFills[fill].fFill, SK_Scalar1*10);
119
120                    SkPaint rectPaint;
121                    rectPaint.setColor(SK_ColorBLACK);
122                    rectPaint.setStyle(SkPaint::kStroke_Style);
123                    rectPaint.setStrokeWidth(-1);
124                    rectPaint.setAntiAlias(true);
125                    canvas->drawRect(rect, rectPaint);
126
127                    SkPaint labelPaint;
128                    labelPaint.setColor(color);
129                    font.setSize(10);
130                    canvas->drawString(gStyles[style].fName, 0, rect.height() + 12.0f,
131                                       font, labelPaint);
132                    canvas->drawString(gFills[fill].fName, 0, rect.height() + 24.0f,
133                                       font, labelPaint);
134                    canvas->drawString(gCaps[cap].fName, 0, rect.height() + 36.0f,
135                                       font, labelPaint);
136                }
137                canvas->restore();
138            }
139            canvas->restore();
140        }
141        canvas->restore();
142        canvas->restore();
143}
144DEF_SIMPLE_GM(linepath, canvas, 1240, 390) {
145    draw(canvas, false);
146}
147DEF_SIMPLE_GM(lineclosepath, canvas, 1240, 390) {
148    draw(canvas, true);
149}
150