我从another SO question获得了此代码。我想知道如何修改它，以便连接圆圈和内圈周边的线条具有与外部颜色peremiter不同的颜色。说外圈的黑色和其他每个笔划都是灰色的。
private static final float CIRCLE_LIMIT = 359.9999f;
/**
* Draws a thick arc between the defined angles, see {@link Canvas#drawArc} for more.
* This method is equivalent to
* <pre><code>
* float rMid = (rInn + rOut) / 2;
* paint.setStyle(Style.STROKE); // there's nothing to fill
* paint.setStrokeWidth(rOut - rInn); // thickness
* canvas.drawArc(new RectF(cx - rMid, cy - rMid, cx + rMid, cy + rMid), startAngle, sweepAngle, false, paint);
* </code></pre>
* but supports different fill and stroke paints.
*
* @param canvas
* @param cx horizontal middle point of the oval
* @param cy vertical middle point of the oval
* @param rInn inner radius of the arc segment
* @param rOut outer radius of the arc segment
* @param startAngle see {@link Canvas#drawArc}
* @param sweepAngle see {@link Canvas#drawArc}, capped at ±360
* @param fill filling paint, can be <code>null</code>
* @param stroke stroke paint, can be <code>null</code>
* @see Canvas#drawArc
*/
public static void drawArcSegment(Canvas canvas, float cx, float cy, float rInn, float rOut, float startAngle,
float sweepAngle, Paint fill, Paint stroke) {
if (sweepAngle > CIRCLE_LIMIT) {
sweepAngle = CIRCLE_LIMIT;
}
if (sweepAngle < -CIRCLE_LIMIT) {
sweepAngle = -CIRCLE_LIMIT;
}
RectF outerRect = new RectF(cx - rOut, cy - rOut, cx + rOut, cy + rOut);
RectF innerRect = new RectF(cx - rInn, cy - rInn, cx + rInn, cy + rInn);
Path segmentPath = new Path();
double start = toRadians(startAngle);
segmentPath.moveTo((float)(cx + rInn * cos(start)), (float)(cy + rInn * sin(start)));
segmentPath.lineTo((float)(cx + rOut * cos(start)), (float)(cy + rOut * sin(start)));
segmentPath.arcTo(outerRect, startAngle, sweepAngle);
double end = toRadians(startAngle + sweepAngle);
segmentPath.lineTo((float)(cx + rInn * cos(end)), (float)(cy + rInn * sin(end)));
segmentPath.arcTo(innerRect, startAngle + sweepAngle, -sweepAngle);
if (fill != null) {
canvas.drawPath(segmentPath, fill);
}
if (stroke != null) {
canvas.drawPath(segmentPath, stroke);
}
}
基本上，函数参数最好是：
public static void drawArcSegment(Canvas canvas, float cx, float cy, float rInn, float rOut, float startAngle, float sweepAngle, Paint fill, Paint strokeOutCircle, Paint StrokeAll)
答案 0 :(得分：0)
在绘制前设置颜色（例如在canvas.drawPath（segmentPath，fill）之前;）
离。
fill.setColor(Color.RED)
stroke.setColor(Color.GREEN)
你可以解析颜色
Color.parseColor("#FFFFFF")
// -> fill.setColor(Color.parseColor("#FFFFFF"));
或从资源导入
getResources().getColor(R.color.mycolor);
// -> fill.setColor(getResources().getColor(R.color.mycolor));
答案 1 :(得分：0)
您需要使用与填充范围相同的计算端点的draw*方法直接使用不同的颜料绘制环段的各个部分。虽然填充它仍然需要Path。我更进了一步，将您的strokeAll拆分为strokeSides + strokeOuter，以便更轻松地重复使用。考虑以下几行：
/**
* Draws a thick arc between the defined angles, see {@link Canvas#drawArc} for more.
* This method is equivalent to
* <pre><code>
* float rMid = (rInn + rOut) / 2;
* paint.setStyle(Style.STROKE); // there's nothing to fill
* paint.setStrokeWidth(rOut - rInn); // thickness
* canvas.drawArc(new RectF(cx - rMid, cy - rMid, cx + rMid, cy + rMid), startAngle, sweepAngle, false, paint);
* </code></pre>
* but supports different fill and stroke paints.
*
* @param cx horizontal middle point of the oval
* @param cy vertical middle point of the oval
* @param rInn inner radius of the arc segment
* @param rOut outer radius of the arc segment
* @param startAngle see {@link Canvas#drawArc}
* @param sweepAngle see {@link Canvas#drawArc}, capped at ±360
* @param fill filling paint, can be <code>null</code>
* @param strokeInner stroke paint for inner ring segment, can be <code>null</code>
* @param strokeOuter stroke paint for outer ring segment, can be <code>null</code>
* @param strokeSides stroke paint for lines connecting the ends of the ring segments, can be <code>null</code>
* @see Canvas#drawArc
*/
public static void drawArcSegment(Canvas canvas, float cx, float cy, float rInn, float rOut, float startAngle,
float sweepAngle, Paint fill, Paint strokeInner, Paint strokeOuter, Paint strokeSides) {
if (sweepAngle > CIRCLE_LIMIT) {
sweepAngle = CIRCLE_LIMIT;
}
if (sweepAngle < -CIRCLE_LIMIT) {
sweepAngle = -CIRCLE_LIMIT;
}
RectF outerRect = new RectF(cx - rOut, cy - rOut, cx + rOut, cy + rOut);
RectF innerRect = new RectF(cx - rInn, cy - rInn, cx + rInn, cy + rInn);
if (fill != null || strokeSides != null) { // to prevent calculating this lot of floats
double start = toRadians(startAngle);
double end = toRadians(startAngle + sweepAngle);
float innerStartX = (float)(cx + rInn * cos(start));
float innerStartY = (float)(cy + rInn * sin(start));
float innerEndX = (float)(cx + rInn * cos(end));
float innerEndY = (float)(cy + rInn * sin(end));
float outerStartX = (float)(cx + rOut * cos(start));
float outerStartY = (float)(cy + rOut * sin(start));
float outerEndX = (float)(cx + rOut * cos(end));
float outerEndY = (float)(cy + rOut * sin(end));
if (fill != null) {
Path segmentPath = new Path();
segmentPath.moveTo(innerStartX, innerStartY);
segmentPath.lineTo(outerStartX, outerStartY);
segmentPath.arcTo(outerRect, startAngle, sweepAngle);
// Path currently at outerEndX,outerEndY
segmentPath.lineTo(innerEndX, innerEndY);
segmentPath.arcTo(innerRect, startAngle + sweepAngle, -sweepAngle); // drawn backwards
canvas.drawPath(segmentPath, fill);
}
if (strokeSides != null) {
canvas.drawLine(innerStartX, innerStartY, outerStartX, outerStartY, strokeSides);
canvas.drawLine(innerEndX, innerEndY, outerEndX, outerEndY, strokeSides);
}
}
if (strokeInner != null) {
canvas.drawArc(innerRect, startAngle, sweepAngle, false, strokeInner);
}
if (strokeOuter != null) {
canvas.drawArc(outerRect, startAngle, sweepAngle, false, strokeOuter);
}
}