所以我在android地图中使用下面的代码在我的绘图方法中绘制这个三角形:
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,但内部人员是空的,因此我可以看到地图。有办法以某种方式填补它吗?
答案 0 :(得分:73)
好的我已经完成了。我正在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;
感谢尼古拉斯的暗示!
答案 1 :(得分:40)
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);
并将此颜色用于您的路径,而不是您的ARGB。确保路径的最后一点在第一点结束,这也是有道理的。
告诉我它是否有效!
答案 2 :(得分:11)
你也可以使用vertice:
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());
答案 3 :(得分:6)
此函数显示如何从位图创建三角形。也就是说,创建三角形裁剪图像。请尝试以下代码或download demo example
public static Bitmap getTriangleBitmap(Bitmap bitmap, int radius) {
Bitmap finalBitmap;
if (bitmap.getWidth() != radius || bitmap.getHeight() != radius)
finalBitmap = Bitmap.createScaledBitmap(bitmap, radius, radius,
false);
else
finalBitmap = bitmap;
Bitmap output = Bitmap.createBitmap(finalBitmap.getWidth(),
finalBitmap.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output);
Paint paint = new Paint();
final Rect rect = new Rect(0, 0, finalBitmap.getWidth(),
finalBitmap.getHeight());
Point point1_draw = new Point(75, 0);
Point point2_draw = new Point(0, 180);
Point point3_draw = new Point(180, 180);
Path path = new Path();
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.drawARGB(0, 0, 0, 0);
paint.setColor(Color.parseColor("#BAB399"));
canvas.drawPath(path, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(finalBitmap, rect, rect, paint);
return output;
}
上面的函数返回在画布上绘制的三角形图像。 Read more
答案 4 :(得分:5)
使用@ Pavel的答案作为指导,如果你没有这些点但是有x,y和高度和宽度,那么这是一个辅助方法。也可以倒置/倒置 - 这对我来说很有用,因为它被用作垂直条形图的结尾。
private void drawTriangle(int x, int y, int width, int height, boolean inverted, Paint paint, Canvas canvas){
Point p1 = new Point(x,y);
int pointX = x + width/2;
int pointY = inverted? y + height : y - height;
Point p2 = new Point(pointX,pointY);
Point p3 = new Point(x+width,y);
Path path = new Path();
path.setFillType(Path.FillType.EVEN_ODD);
path.moveTo(p1.x,p1.y);
path.lineTo(p2.x,p2.y);
path.lineTo(p3.x,p3.y);
path.close();
canvas.drawPath(path, paint);
}
答案 5 :(得分:4)
private void drawArrows(Point[] point, Canvas canvas, Paint paint) {
float [] points = new float[8];
points[0] = point[0].x;
points[1] = point[0].y;
points[2] = point[1].x;
points[3] = point[1].y;
points[4] = point[2].x;
points[5] = point[2].y;
points[6] = point[0].x;
points[7] = point[0].y;
canvas.drawVertices(VertexMode.TRIANGLES, 8, points, 0, null, 0, null, 0, null, 0, 0, paint);
Path path = new Path();
path.moveTo(point[0].x , point[0].y);
path.lineTo(point[1].x,point[1].y);
path.lineTo(point[2].x,point[2].y);
canvas.drawPath(path,paint);
}
答案 6 :(得分:3)
首次初始化后,您需要删除path.moveTo。
Path path = new Path();
path.moveTo(point1_returned.x, point1_returned.y);
path.lineTo(point2_returned.x, point2_returned.y);
path.lineTo(point3_returned.x, point3_returned.y);
path.lineTo(point1_returned.x, point1_returned.y);
path.close();
答案 7 :(得分:1)
在每个InitializeComponent
moveTo()
换句话说,删除除第一个之外的每个lineTo()
。
说真的,如果我只是复制粘贴OP的代码并删除不必要的moveTo()
来电,那就可以了。
没有其他事情需要做。
编辑:我知道OP已经发布了他的“最终工作解决方案”,但他没有声明为什么它的工作原理。实际的原因让我非常惊讶,所以我觉得有必要添加一个答案。