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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkPath.h"
#include <cmath>
#define PI SK_ScalarPI
#define LIN_SEGMENTS 10
class OverstrokeView : public SampleView {
public:
SkScalar fStroke;
int fPathType; // super lazy enum
bool fClosePath;
bool fDrawFillPath;
OverstrokeView() {
fStroke = 5;
fPathType = 0;
fClosePath = false;
fDrawFillPath = false;
this->setBGColor(0xFFFFFFFF);
}
protected:
bool onQuery(SkEvent* evt) override {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "PathOverstroke");
return true;
}
SkUnichar uni;
if (SampleCode::CharQ(*evt, &uni)) {
switch (uni) {
case ',':
fStroke += 1.0;
this->inval(nullptr);
return true;
case '.':
fStroke -= 1.0;
this->inval(nullptr);
return true;
case 'x':
fPathType = (fPathType + 1) % 3;
this->inval(nullptr);
return true;
case 'c':
fClosePath = !fClosePath;
this->inval(nullptr);
return true;
case 'f':
fDrawFillPath = !fDrawFillPath;
this->inval(nullptr);
return true;
default:
break;
}
}
return this->INHERITED::onQuery(evt);
}
SkPath quadPath(SkPoint p1, SkPoint p2) {
SkASSERT(p1.y() == p2.y());
SkPath path;
path.moveTo(p1);
path.lineTo(p2);
SkPoint p3 = SkPoint::Make((p1.x() + p2.x()) / 2.0f, p1.y() * 0.7f);
path.quadTo(p3, p1);
return path;
}
SkPath linSemicirclePath(SkPoint p1, SkPoint p2) {
SkASSERT(p1.y() == p2.y());
SkPath path;
path.moveTo(p1);
path.lineTo(p2);
SkPoint pt;
for (int i = 0; i < LIN_SEGMENTS; i++) {
float theta = i * PI / (LIN_SEGMENTS);
SkScalar x = 65 + 15 * cos(theta);
SkScalar y = 50 - 15 * sin(theta);
pt = SkPoint::Make(x, y);
path.lineTo(pt);
}
path.lineTo(p1);
return path;
}
SkPath rectPath(SkPoint p1) {
SkRect r = SkRect::MakeXYWH(p1.fX, p1.fY, 20, 20);
SkPath path;
path.addRect(r);
return path;
}
void onDrawContent(SkCanvas* canvas) override {
const float SCALE = 1;
canvas->translate(30, 40);
canvas->scale(SCALE, SCALE);
SkPoint p1 = SkPoint::Make(50, 50);
SkPoint p2 = SkPoint::Make(80, 50);
SkPath path;
switch (fPathType) {
case 0:
path = quadPath(p1, p2);
break;
case 1:
path = linSemicirclePath(p1, p2);
break;
case 2:
path = rectPath(p1);
break;
default:
path = quadPath(p1, p2);
break;
}
if (fClosePath) {
path.close();
}
SkPaint p;
p.setColor(SK_ColorRED);
p.setAntiAlias(true);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(fStroke);
canvas->drawPath(path, p);
if (fDrawFillPath) {
SkPath fillpath;
p.getFillPath(path, &fillpath);
SkPaint fillp;
fillp.setColor(SK_ColorBLACK);
fillp.setAntiAlias(true);
fillp.setStyle(SkPaint::kStroke_Style);
canvas->drawPath(fillpath, fillp);
}
}
private:
typedef SampleView INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new OverstrokeView; }
static SkViewRegister reg(MyFactory);
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