如何绘制Arrowline在android.graphics.Path与正确configerations [英] How to Draw Arrowline in android.graphics.Path with correct configerations

问题描述

我曾尝试：

我试图显示与以下code中的箭头线

I'm trying to display the arrow line with following code

Path mArrowPath=new Paint();;
mArrowPath.rewind();
mArrowPath.moveTo(0, mHeight / 2);
mArrowPath.lineTo(mWidth / 2, 0);
mArrowPath.lineTo(mWidth, mHeight / 2);
mArrowPath.lineTo(mWidth * 3 / 4, mHeight / 2);
mArrowPath.lineTo(mWidth * 3 / 4, mHeight);
mArrowPath.lineTo(mWidth / 4, mHeight);
mArrowPath.lineTo(mWidth / 4, mHeight / 2);
mArrowPath.lineTo(0, mHeight / 2);

Shape pathshap = new PathShape(mArrowP,maxWidth,maxHeight);

ShapeDrawable shapeD = new ShapeDrawable(pathshap);

shapeD.draw(canvas); //display it in onDraw(Canvas canvas)

我已经得到了以下结果。

I have got the following result

问题：

我不能画出所需预期的结果，我不明白/查找路径配置参数，显示下面的结果！
我没有增加在长度 宽度的箭头线的大小。

I'm not able draw the required expected result, I'm failed to understand/find path configuration parameters for displaying following result! I'm failed to increase the length, width size of the arrow line.

预期结果：

任何帮助将不胜感激！

any help will be grateful !

推荐答案

您可以使用canvas.rotate（）方法来旋转箭头

you can use canvas.rotate() method to rotate arrow

或

Path mArrowPath=new Paint();;
mArrowPath.rewind();
mArrowPath.moveTo(mWidth , mHeight / 2);
mArrowPath.lineTo(mWidth / 2, mHeight );
mArrowPath.lineTo(mWidth / 2, mHeight* 3 / 4);
mArrowPath.lineTo(0, mHeight* 3 / 4);
mArrowPath.lineTo(0, mHeight/ 4);
mArrowPath.lineTo(mWidth / 2, mHeight/ 4);
mArrowPath.lineTo(mWidth / 2,0);
mArrowPath.lineTo(mWidth , mHeight / 2);
Shape pathshap = new PathShape(mArrowP,maxWidth,maxHeight);

ShapeDrawable shapeD = new ShapeDrawable(pathshap);

shapeD.draw(canvas);

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