问题
Given this code to draw a line:
Paint p;
p = new Paint(Paint.ANTI_ALIAS_FLAG);
p.setColor(android.graphics.Color.WHITE);
p.setStyle(Paint.Style.FILL);
p.setStrokeWidth(21);
canvas.drawLine(0,50,100,50,p);
there are 3 possible stroke-drawing strategies:
- Inside: The line is painted in the rectangle (0,50,100,70)
- Center: The line is painted in the rectangle (0,40,100,60)
- Outside: The line is painted in the rectangle (0,30,100,50)
In practice it appears that default behavior follows the Center strategy. Is it possible to modify a paint to produce results corresponding to one of the other strategies?
回答1:
No you can't; the stroke is always centered. The only things you can control are:
- stroke miter
- stroke cap
- stroke join
- stroke width
You must manually account for the stroke width when defining your drawing paths.
来源：https://stackoverflow.com/questions/15309029/android-paint-stroke-width-positioning