/*
* Copyright 2012 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 "SkRandom.h"
#include "SkRRect.h"
#include "SkColorPriv.h"
static void rotateAbout(SkCanvas* canvas, SkScalar degrees,
SkScalar cx, SkScalar cy) {
canvas->translate(cx, cy);
canvas->rotate(degrees);
canvas->translate(-cx, -cy);
}
class RotateCirclesView : public SampleView {
public:
RotateCirclesView() {
this->setBGColor(SK_ColorLTGRAY);
fAngle = 0;
}
protected:
// overrides from SkEventSink
virtual bool onQuery(SkEvent* evt) {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "RotateCircles");
return true;
}
return this->INHERITED::onQuery(evt);
}
virtual void onDrawContent(SkCanvas* canvas) {
SkRandom rand;
SkPaint paint;
paint.setAntiAlias(true);
paint.setStrokeWidth(20);
SkScalar cx = 240;
SkScalar cy = 240;
SkScalar DX = 240 * 2;
SkColor color = 0;
float scale = 1;
float sign = 0.3f;
for (SkScalar rad = 200; rad >= 20; rad -= 15) {
sign = -sign;
scale += 0.2f;
paint.setColor(rand.nextU());
paint.setAlpha(0xFF);
color = ~color;
paint.setStyle(SkPaint::kFill_Style);
canvas->save();
rotateAbout(canvas, fAngle * scale * sign, cx, cy);
canvas->drawCircle(cx, cy, rad, paint);
canvas->restore();
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(rad*2);
canvas->save();
rotateAbout(canvas, fAngle * scale * sign, cx + DX, cy);
canvas->drawCircle(cx + DX, cy, 10, paint);
canvas->restore();
canvas->save();
rotateAbout(canvas, fAngle * scale * sign, cx + DX, cy + DX);
canvas->drawCircle(cx + DX, cy + DX, 10, paint);
canvas->restore();
}
fAngle = (fAngle + 1) % 360;
this->inval(NULL);
}
private:
int fAngle;
typedef SkView INHERITED;
};
class TestCirclesView : public SampleView {
public:
TestCirclesView() {
}
protected:
virtual bool onQuery(SkEvent* evt) SK_OVERRIDE {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "RotateCircles2");
return true;
}
return this->INHERITED::onQuery(evt);
}
void draw_real_circle(SkCanvas* canvas, SkScalar radius) {
int w = SkScalarCeilToInt(radius * 2);
int h = w;
SkBitmap bm;
bm.allocN32Pixels(w, h);
bm.eraseColor(0);
SkAutoLockPixels alp(bm);
SkScalar cx = radius;
SkScalar cy = radius;
for (int y = 0; y < h; y += 1) {
for (int x = 0; x < w; x += 1) {
float d = sqrtf((x - cx)*(x - cx) + (y - cy)*(y - cy));
if (d <= radius) {
*bm.getAddr32(x, y) = SkPackARGB32(0xFF, 0, 0, 0);
}
}
}
canvas->drawBitmap(bm, 0, 0, NULL);
}
virtual void onDrawContent(SkCanvas* canvas) {
SkScalar radius = 256;
canvas->translate(10, 10);
draw_real_circle(canvas, radius);
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(0x80FF0000);
canvas->drawCircle(radius, radius, radius, paint);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(radius);
paint.setColor(0x8000FF00);
canvas->drawCircle(radius, radius, radius/2, paint);
}
private:
typedef SkView INHERITED;
};
static bool hittest(const SkPoint& target, SkScalar x, SkScalar y) {
const SkScalar TOL = 7;
return SkPoint::Distance(target, SkPoint::Make(x, y)) <= TOL;
}
static int getOnCurvePoints(const SkPath& path, SkPoint storage[]) {
SkPath::RawIter iter(path);
SkPoint pts[4];
SkPath::Verb verb;
int count = 0;
while ((verb = iter.next(pts)) != SkPath::kDone_Verb) {
switch (verb) {
case SkPath::kMove_Verb:
case SkPath::kLine_Verb:
case SkPath::kQuad_Verb:
case SkPath::kCubic_Verb:
storage[count++] = pts[0];
break;
default:
break;
}
}
return count;
}
#include "SkPathMeasure.h"
class TestStrokeView : public SampleView {
enum {
SKELETON_COLOR = 0xFF0000FF,
WIREFRAME_COLOR = 0x80FF0000
};
enum {
kCount = 9
};
SkPoint fPts[kCount];
SkScalar fWidth, fDWidth;
public:
TestStrokeView() {
this->setBGColor(SK_ColorLTGRAY);
fPts[0].set(50, 200);
fPts[1].set(50, 100);
fPts[2].set(150, 50);
fPts[3].set(300, 50);
fPts[4].set(350, 200);
fPts[5].set(350, 100);
fPts[6].set(450, 50);
fPts[7].set(200, 200);
fPts[8].set(400, 400);
fWidth = 50;
fDWidth = 0.25f;
}
protected:
virtual bool onQuery(SkEvent* evt) SK_OVERRIDE {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "RotateCircles3");
return true;
}
return this->INHERITED::onQuery(evt);
}
void draw_points(SkCanvas* canvas, const SkPath& path, SkColor color,
bool show_lines) {
SkPaint paint;
paint.setColor(color);
paint.setAlpha(0x80);
int n = path.countPoints();
SkAutoSTArray<32, SkPoint> pts(n);
if (show_lines) {
path.getPoints(pts.get(), n);
canvas->drawPoints(SkCanvas::kPolygon_PointMode, n, pts.get(), paint);
} else {
n = getOnCurvePoints(path, pts.get());
}
paint.setStrokeWidth(5);
canvas->drawPoints(SkCanvas::kPoints_PointMode, n, pts.get(), paint);
}
void draw_ribs(SkCanvas* canvas, const SkPath& path, SkScalar width,
SkColor color) {
const SkScalar radius = width / 2;
SkPathMeasure meas(path, false);
SkScalar total = meas.getLength();
SkScalar delta = 8;
SkPaint paint;
paint.setColor(color);
SkPoint pos, tan;
for (SkScalar dist = 0; dist <= total; dist += delta) {
if (meas.getPosTan(dist, &pos, &tan)) {
tan.scale(radius);
tan.rotateCCW();
canvas->drawLine(pos.x() + tan.x(), pos.y() + tan.y(),
pos.x() - tan.x(), pos.y() - tan.y(), paint);
}
}
}
void draw_stroke(SkCanvas* canvas, const SkPath& path, SkScalar width) {
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
paint.setColor(SKELETON_COLOR);
canvas->drawPath(path, paint);
draw_points(canvas, path, SKELETON_COLOR, true);
draw_ribs(canvas, path, width, 0xFF00FF00);
SkPath fill;
SkPaint p;
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(width);
p.getFillPath(path, &fill);
paint.setColor(WIREFRAME_COLOR);
canvas->drawPath(fill, paint);
draw_points(canvas, fill, WIREFRAME_COLOR, false);
}
virtual void onDrawContent(SkCanvas* canvas) {
SkPath path;
SkScalar width = fWidth;
path.moveTo(fPts[0]);
path.cubicTo(fPts[1], fPts[2], fPts[3]);
draw_stroke(canvas, path, width);
path.reset();
path.moveTo(fPts[4]);
path.quadTo(fPts[5], fPts[6]);
draw_stroke(canvas, path, width);
SkScalar rad = 32;
SkRect r;
r.set(&fPts[7], 2);
path.reset();
SkRRect rr;
rr.setRectXY(r, rad, rad);
path.addRRect(rr);
draw_stroke(canvas, path, width);
path.reset();
SkRRect rr2;
rr.inset(width/2, width/2, &rr2);
path.addRRect(rr2, SkPath::kCCW_Direction);
rr.inset(-width/2, -width/2, &rr2);
path.addRRect(rr2, SkPath::kCW_Direction);
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(0x40FF8844);
canvas->drawPath(path, paint);
fWidth += fDWidth;
if (fDWidth > 0 && fWidth > 100) {
fDWidth = -fDWidth;
} else if (fDWidth < 0 && fWidth < 10) {
fDWidth = -fDWidth;
}
this->inval(NULL);
}
class MyClick : public Click {
public:
int fIndex;
MyClick(SkView* target, int index) : Click(target), fIndex(index) {}
};
virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y,
unsigned modi) SK_OVERRIDE {
for (size_t i = 0; i < SK_ARRAY_COUNT(fPts); ++i) {
if (hittest(fPts[i], x, y)) {
return new MyClick(this, (int)i);
}
}
return this->INHERITED::onFindClickHandler(x, y, modi);
}
virtual bool onClick(Click* click) {
int index = ((MyClick*)click)->fIndex;
fPts[index].offset(SkIntToScalar(click->fICurr.fX - click->fIPrev.fX),
SkIntToScalar(click->fICurr.fY - click->fIPrev.fY));
this->inval(NULL);
return true;
}
private:
typedef SkView INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
static SkView* F0() { return new RotateCirclesView; }
static SkViewRegister gR0(F0);
static SkView* F1() { return new TestCirclesView; }
static SkViewRegister gR1(F1);
static SkView* F2() { return new TestStrokeView; }
static SkViewRegister gR2(F2);