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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkParsePath.h"
#include "SkPath.h"
/*
The arcto test below should draw the same as this SVG:
(Note that Skia's arcTo Direction parameter value is opposite SVG's sweep value, e.g. 0 / 1)
<svg width="500" height="600">
<path d="M 50,100 A50,50, 0,0,1, 150,200" style="stroke:#660000; fill:none; stroke-width:2" />
<path d="M100,100 A50,100, 0,0,1, 200,200" style="stroke:#660000; fill:none; stroke-width:2" />
<path d="M150,100 A50,50, 45,0,1, 250,200" style="stroke:#660000; fill:none; stroke-width:2" />
<path d="M200,100 A50,100, 45,0,1, 300,200" style="stroke:#660000; fill:none; stroke-width:2" />
<path d="M150,200 A50,50, 0,1,0, 150,300" style="stroke:#660000; fill:none; stroke-width:2" />
<path d="M200,200 A50,100, 0,1,0, 200,300" style="stroke:#660000; fill:none; stroke-width:2" />
<path d="M250,200 A50,50, 45,1,0, 250,300" style="stroke:#660000; fill:none; stroke-width:2" />
<path d="M300,200 A50,100, 45,1,0, 300,300" style="stroke:#660000; fill:none; stroke-width:2" />
<path d="M250,400 A120,80 0 0,0 250,500"
fill="none" stroke="red" stroke-width="5" />
<path d="M250,400 A120,80 0 1,1 250,500"
fill="none" stroke="green" stroke-width="5"/>
<path d="M250,400 A120,80 0 1,0 250,500"
fill="none" stroke="purple" stroke-width="5"/>
<path d="M250,400 A120,80 0 0,1 250,500"
fill="none" stroke="blue" stroke-width="5"/>
<path d="M100,100 A 0, 0 0 0,1 200,200"
fill="none" stroke="blue" stroke-width="5" stroke-linecap="round"/>
<path d="M200,100 A 80,80 0 0,1 200,100"
fill="none" stroke="blue" stroke-width="5" stroke-linecap="round"/>
</svg>
*/
DEF_SIMPLE_GM(arcto, canvas, 500, 600) {
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(2);
paint.setColor(0xFF660000);
// canvas->scale(2, 2); // for testing on retina
SkRect oval = SkRect::MakeXYWH(100, 100, 100, 100);
SkPath svgArc;
for (int angle = 0; angle <= 45; angle += 45) {
for (int oHeight = 2; oHeight >= 1; --oHeight) {
SkScalar ovalHeight = oval.height() / oHeight;
svgArc.moveTo(oval.fLeft, oval.fTop);
svgArc.arcTo(oval.width() / 2, ovalHeight, SkIntToScalar(angle), SkPath::kSmall_ArcSize,
SkPath::kCW_Direction, oval.right(), oval.bottom());
canvas->drawPath(svgArc, paint);
svgArc.reset();
svgArc.moveTo(oval.fLeft + 100, oval.fTop + 100);
svgArc.arcTo(oval.width() / 2, ovalHeight, SkIntToScalar(angle), SkPath::kLarge_ArcSize,
SkPath::kCCW_Direction, oval.right(), oval.bottom() + 100);
canvas->drawPath(svgArc, paint);
oval.offset(50, 0);
svgArc.reset();
}
}
paint.setStrokeWidth(5);
const SkColor purple = 0xFF800080;
const SkColor darkgreen = 0xFF008000;
const SkColor colors[] = { SK_ColorRED, darkgreen, purple, SK_ColorBLUE };
const char* arcstrs[] = {
"M250,400 A120,80 0 0,0 250,500",
"M250,400 A120,80 0 1,1 250,500",
"M250,400 A120,80 0 1,0 250,500",
"M250,400 A120,80 0 0,1 250,500"
};
int cIndex = 0;
for (const char* arcstr : arcstrs) {
SkParsePath::FromSVGString(arcstr, &svgArc);
paint.setColor(colors[cIndex++]);
canvas->drawPath(svgArc, paint);
}
// test that zero length arcs still draw round cap
paint.setStrokeCap(SkPaint::kRound_Cap);
SkPath path;
path.moveTo(100, 100);
path.arcTo(0, 0, 0, SkPath::kLarge_ArcSize, SkPath::kCW_Direction, 200, 200);
canvas->drawPath(path, paint);
path.reset();
path.moveTo(200, 100);
path.arcTo(80, 80, 0, SkPath::kLarge_ArcSize, SkPath::kCW_Direction, 200, 100);
canvas->drawPath(path, paint);
}
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