Android Paint stroke width positioning

 

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?

    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.

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