如何在android画布中绘制一个实心三角形？
如何在android画布中绘制一个实心三角形？
提问于 2010-08-17 17:37:35
所以我在我的draw方法中使用下面的代码在android地图中绘制这个三角形：
paint.setARGB(255, 153, 29, 29);
paint.setStyle(Paint.Style.FILL_AND_STROKE);
paint.setAntiAlias(true);
Path path = new Path();
path.moveTo(point1_returned.x, point1_returned.y);
path.lineTo(point2_returned.x, point2_returned.y);
path.moveTo(point2_returned.x, point2_returned.y);
path.lineTo(point3_returned.x, point3_returned.y);
path.moveTo(point3_returned.x, point3_returned.y);
path.lineTo(point1_returned.x, point1_returned.y);
path.close();
canvas.drawPath(path, paint);pointX_returned是我从字段中获得的坐标。它们基本上是纬度和经度。结果是一个漂亮的三角形，但内部是空的，因此我可以看到地图。有没有办法把它填满呢？
回答 6
Stack Overflow用户
回答已采纳
发布于 2010-08-17 17:50:36
您可能需要执行以下操作：
Paint red = new Paint();
red.setColor(android.graphics.Color.RED);
red.setStyle(Paint.Style.FILL);并使用此颜色的路径，而不是您的ARGB。确保你路径的最后一个点在第一个点结束，这也是有意义的。
请告诉我它能不能用！
Stack Overflow用户
发布于 2010-08-17 18:58:31
好的，我已经做到了。我分享这段代码，以防其他人需要它：
super.draw(canvas, mapView, true);
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setStrokeWidth(2);
paint.setColor(android.graphics.Color.RED);
paint.setStyle(Paint.Style.FILL_AND_STROKE);
paint.setAntiAlias(true);
Point point1_draw = new Point();
Point point2_draw = new Point();
Point point3_draw = new Point();
mapView.getProjection().toPixels(point1, point1_draw);
mapView.getProjection().toPixels(point2, point2_draw);
mapView.getProjection().toPixels(point3, point3_draw);
Path path = new Path();
path.setFillType(Path.FillType.EVEN_ODD);
path.moveTo(point1_draw.x,point1_draw.y);
path.lineTo(point2_draw.x,point2_draw.y);
path.lineTo(point3_draw.x,point3_draw.y);
path.lineTo(point1_draw.x,point1_draw.y);
path.close();
canvas.drawPath(path, paint);
//canvas.drawLine(point1_draw.x,point1_draw.y,point2_draw.x,point2_draw.y, paint);
return true;谢谢你的提示，Nicolas！
Stack Overflow用户
发布于 2010-08-18 15:51:08
您还可以使用顶点：
private static final int verticesColors[] = {
Color.LTGRAY, Color.LTGRAY, Color.LTGRAY, 0xFF000000, 0xFF000000, 0xFF000000
};
float verts[] = {
point1.x, point1.y, point2.x, point2.y, point3.x, point3.y
};
canvas.drawVertices(Canvas.VertexMode.TRIANGLES, verts.length, verts, 0, null, 0, verticesColors, 0, null, 0, 0, new Paint());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/3501126
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