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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkDashPathEffect.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkRRect.h"
namespace skiagm {
class ContourStartGM : public GM {
public:
ContourStartGM() {
const SkScalar kMaxDashLen = 100;
const SkScalar kDashGrowth = 1.2f;
SkSTArray<100, SkScalar> intervals;
for (SkScalar len = 1; len < kMaxDashLen; len *= kDashGrowth) {
intervals.push_back(len);
intervals.push_back(len);
}
SkAutoTUnref<SkPathEffect> effect(
SkDashPathEffect::Create(intervals.begin(), intervals.count(), 0));
fDashPaint.setAntiAlias(true);
fDashPaint.setStyle(SkPaint::kStroke_Style);
fDashPaint.setStrokeWidth(6);
fDashPaint.setColor(0xff008000);
fDashPaint.setPathEffect(effect);
fPointsPaint.setColor(0xff800000);
fPointsPaint.setStrokeWidth(3);
fRect = SkRect::MakeLTRB(10, 10, 100, 70);
}
protected:
SkString onShortName() override {
return SkString("contour_start");
}
SkISize onISize() override { return SkISize::Make(kImageWidth, kImageHeight); }
void onDraw(SkCanvas* canvas) override {
drawDirs(canvas, [](const SkRect& rect, SkPath::Direction dir, unsigned startIndex) {
SkPath path;
path.addRect(rect, dir, startIndex);
return path;
});
drawDirs(canvas, [](const SkRect& rect, SkPath::Direction dir, unsigned startIndex) {
SkPath path;
path.addOval(rect, dir, startIndex);
return path;
});
drawDirs(canvas, [](const SkRect& rect, SkPath::Direction dir, unsigned startIndex) {
SkRRect rrect;
const SkVector radii[4] = { {15, 15}, {15, 15}, {15, 15}, {15, 15}};
rrect.setRectRadii(rect, radii);
SkPath path;
path.addRRect(rrect, dir, startIndex);
return path;
});
drawDirs(canvas, [](const SkRect& rect, SkPath::Direction dir, unsigned startIndex) {
SkRRect rrect;
rrect.setRect(rect);
SkPath path;
path.addRRect(rrect, dir, startIndex);
return path;
});
drawDirs(canvas, [](const SkRect& rect, SkPath::Direction dir, unsigned startIndex) {
SkRRect rrect;
rrect.setOval(rect);
SkPath path;
path.addRRect(rrect, dir, startIndex);
return path;
});
}
private:
static const int kImageWidth = 1200;
static const int kImageHeight = 600;
SkPaint fDashPaint, fPointsPaint;
SkRect fRect;
void drawDirs(SkCanvas* canvas,
SkPath (*makePath)(const SkRect&, SkPath::Direction, unsigned)) const {
drawOneColumn(canvas, SkPath::kCW_Direction, makePath);
canvas->translate(kImageWidth / 10, 0);
drawOneColumn(canvas, SkPath::kCCW_Direction, makePath);
canvas->translate(kImageWidth / 10, 0);
}
void drawOneColumn(SkCanvas* canvas, SkPath::Direction dir,
SkPath (*makePath)(const SkRect&, SkPath::Direction, unsigned)) const {
SkAutoCanvasRestore acr(canvas, true);
for (unsigned i = 0; i < 8; ++i) {
const SkPath path = makePath(fRect, dir, i);
canvas->drawPath(path, fDashPaint);
const int n = path.countPoints();
SkAutoTArray<SkPoint> points(n);
path.getPoints(points.get(), n);
canvas->drawPoints(SkCanvas::kPoints_PointMode, n, points.get(), fPointsPaint);
canvas->translate(0, kImageHeight / 8);
}
}
typedef GM INHERITED;
};
DEF_GM( return new ContourStartGM(); )
} // namespace skiagm
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