如何使用画图给圆加上边框
如何使用画图给圆加上边框
提问于 2016-01-23 14:39:30
嗨，我已经实现了进度栏，它工作得很好，但我的问题是，我需要给一个唯一的边界，以圆使用油漆。我在上面工作过，但它占用了所有的圆圈面积，我只需要边界。
我的画图代码：
mCirclePaint = new Paint();
mCirclePaint.setAntiAlias(true);
mCirclePaint.setDither(true);
mCirclePaint.setColor(mCircleColor);
mCirclePaint.setStrokeWidth(mCircleStrokeWidth);
mCirclePaint.setStyle(Paint.Style.STROKE);
mCirclePaint.setStrokeJoin(Paint.Join.MITER);
// mCirclePaint.setShadowLayer(4.0f, 0.0f, 2.0f, Color.BLACK);
mCirclePaint.setStrokeCap(Paint.Cap.SQUARE);
canvas.drawPath(mCirclePath, mCirclePaint)回答 2
Stack Overflow用户
回答已采纳
发布于 2016-01-23 16:59:57
试试这个，
paint = new Paint();
paint.setColor(Color.GREEN);
paint.setStrokeWidth(2);
paint.setStyle(Paint.Style.STROKE);
canvas.drawCircle(0, 0, (float) (width1/(1.4)), paint); 并参考这篇文章，可能会对你有所帮助。Android : canvas.drawBitmap() method not working properly
Stack Overflow用户
发布于 2016-01-23 17:38:34
这是我为您的解决方案编写的代码。只需复制这个类，并试着理解你做错了什么。此视图将在视图中心绘制进度条。
/**
* Created by GIGAMOLE on 23.01.2016.
*/
public class StrokeProgressBar extends View {
private final static float BAR_STROKE = 10.0f;
private final static float BAR_HEIGHT = 60.0f;
private final static float BAR_PADDING = 100.0f;
private final Paint mProgressPaint = new Paint(Paint.ANTI_ALIAS_FLAG) {
{
setDither(true);
setAntiAlias(true);
setColor(Color.BLUE);
setStyle(Style.FILL);
}
};
// private final Paint mBgPaint = new Paint(Paint.ANTI_ALIAS_FLAG) {
// {
// setDither(true);
// setAntiAlias(true);
// setColor(Color.GRAY);
// setStyle(Style.FILL);
// }
// };
private final Paint mBgStrokePaint = new Paint(Paint.ANTI_ALIAS_FLAG) {
{
setDither(true);
setAntiAlias(true);
setColor(Color.BLUE);
setStyle(Style.STROKE);
setStrokeWidth(BAR_STROKE);
setStrokeCap(Cap.SQUARE);
}
};
public StrokeProgressBar(final Context context) {
this(context, null);
}
public StrokeProgressBar(final Context context, final AttributeSet attrs) {
this(context, attrs, 0);
}
public StrokeProgressBar(final Context context, final AttributeSet attrs, final int defStyleAttr) {
super(context, attrs, defStyleAttr);
// Draw always
setWillNotDraw(false);
}
@Override
protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
protected void onDraw(final Canvas canvas) {
super.onDraw(canvas);
final float height = canvas.getClipBounds().height();
final float width = canvas.getClipBounds().width();
// Background rect
final Rect bgRect = new Rect(
(int) BAR_PADDING,
(int) (height / 2.0f - BAR_HEIGHT / 2.0f),
(int) (width - BAR_PADDING),
(int) (height / 2.0f + BAR_HEIGHT / 2.0f)
);
// Progress bar rect
final Rect progressRect = new Rect(
(int) BAR_PADDING,
(int) (height / 2.0f - BAR_HEIGHT / 2.0f),
(int) ((width - BAR_PADDING) * 0.7f), // 0.7f is the fraction of progress == 70%
(int) (height / 2.0f + BAR_HEIGHT / 2.0f)
);
// At first draw stroke
canvas.drawRect(
bgRect,
mBgStrokePaint
);
// // At second draw bg
// canvas.drawRect(
// bgRect,
// mBgPaint
// );
// At third draw progress
canvas.drawRect(
progressRect,
mProgressPaint
);
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/34960465
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