skia2/gm/arcofzorro.cpp
commit-bot@chromium.org e0e7cfe44b Change old PRG to be SkLCGRandom; change new one to SkRandom
The goal here is to get people to start using the new random number
generator, while leaving the old one in place so we don't have to 
rebaseline GMs.

R=reed@google.com, bsalomon@google.com

Author: jvanverth@google.com

Review URL: https://chromiumcodereview.appspot.com/23576015

git-svn-id: http://skia.googlecode.com/svn/trunk@11169 2bbb7eff-a529-9590-31e7-b0007b416f81
2013-09-09 20:09:12 +00:00

84 lines
2.0 KiB
C++

/*
* Copyright 2013 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 "SkRandom.h"
namespace skiagm {
// This GM draws a lot of arcs in a 'Z' shape. It particularly exercises
// the 'drawArc' code near a singularly of its processing (i.e., near the
// edge of one of its underlying quads).
class ArcOfZorroGM : public GM {
public:
ArcOfZorroGM() {
this->setBGColor(0xFFCCCCCC);
}
protected:
virtual SkString onShortName() SK_OVERRIDE {
return SkString("arcofzorro");
}
virtual SkISize onISize() SK_OVERRIDE {
return make_isize(1000, 1000);
}
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
SkRandom rand;
SkRect rect = SkRect::MakeXYWH(10, 10, 200, 200);
SkPaint p;
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(35);
int xOffset = 0, yOffset = 0;
int direction = 0;
for (float arc = 134.0f; arc < 136.0f; arc += 0.01f) {
SkColor color = rand.nextU();
color |= 0xff000000;
p.setColor(color);
canvas->save();
canvas->translate(SkIntToScalar(xOffset), SkIntToScalar(yOffset));
canvas->drawArc(rect, 0, arc, false, p);
canvas->restore();
switch (direction) {
case 0:
xOffset += 10;
if (xOffset >= 700) {
direction = 1;
}
break;
case 1:
xOffset -= 10;
yOffset += 10;
if (xOffset < 50) {
direction = 2;
}
break;
case 2:
xOffset += 10;
break;
}
}
}
private:
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return SkNEW(ArcOfZorroGM); )
}