android 最优绘制圆图方法
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public class OvalImageView extends ImageView {
public OvalImageView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public OvalImageView(Context context) {
super(context);
init();
}
private final RectF roundRect = new RectF();
private float rect_adius = 50;
private final Paint maskPaint = new Paint();
private final Paint zonePaint = new Paint();
private void init() {
maskPaint.setAntiAlias(true);
maskPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
zonePaint.setAntiAlias(true);
zonePaint.setColor(Color.WHITE);
float density = getResources().getDisplayMetrics().density;
rect_adius = rect_adius * density;
}
public void setRectAdius(float adius) {
rect_adius = adius;
invalidate();
}
@Override
protected void onLayout(boolean changed, int left, int top, int right,
int bottom) {
super.onLayout(changed, left, top, right, bottom);
int w = getWidth();
int h = getHeight();
roundRect.set(0, 0, w, h);
}
@Override
public void draw(Canvas canvas) {
int src=canvas.saveLayer(roundRect, zonePaint, Canvas.ALL_SAVE_FLAG);
canvas.drawArc(roundRect, 0f, 360f, false, zonePaint);
canvas.saveLayer(roundRect, maskPaint, Canvas.ALL_SAVE_FLAG);
super.draw(canvas);
canvas.restoreToCount(src);
}
}
public OvalImageView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public OvalImageView(Context context) {
super(context);
init();
}
private final RectF roundRect = new RectF();
private float rect_adius = 50;
private final Paint maskPaint = new Paint();
private final Paint zonePaint = new Paint();
private void init() {
maskPaint.setAntiAlias(true);
maskPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
zonePaint.setAntiAlias(true);
zonePaint.setColor(Color.WHITE);
float density = getResources().getDisplayMetrics().density;
rect_adius = rect_adius * density;
}
public void setRectAdius(float adius) {
rect_adius = adius;
invalidate();
}
@Override
protected void onLayout(boolean changed, int left, int top, int right,
int bottom) {
super.onLayout(changed, left, top, right, bottom);
int w = getWidth();
int h = getHeight();
roundRect.set(0, 0, w, h);
}
@Override
public void draw(Canvas canvas) {
int src=canvas.saveLayer(roundRect, zonePaint, Canvas.ALL_SAVE_FLAG);
canvas.drawArc(roundRect, 0f, 360f, false, zonePaint);
canvas.saveLayer(roundRect, maskPaint, Canvas.ALL_SAVE_FLAG);
super.draw(canvas);
canvas.restoreToCount(src);
}
}
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