StageXL
StageXL copied to clipboard
bp74
getBounds method
getBounds method always adding 2px to width and hight. More details: https://plus.google.com/u/0/109524935899218597554/posts/4u9gU5JMHjD I'm using ToolkitForDart v0.5 and still see the issue.
The bug is related to StageXL measurement; it's not related to the toolkit.
Currently i don't have a good idea how to solve this issue. The reason behind this issue is the way how the HTML5 Canvas element draws vector shapes.
Here is a related question on StackOverflow talking about the same problem. http://stackoverflow.com/questions/9311428/draw-single-pixel-line-in-html5-canvas
Here is the stolen picture from the first answer:
When you draw a rectangle from 0, 0 to 100,100 then the line is actually drawn on the edge of coordinate system. Which means that the line (with width 1) is actually drawn outside of the rectangle.
You would get a better result if you draw the line from 0.5, 0.5 to 99.5, 99.5. With a line width of 1 you would pretty much get the same result as in Flash. It would be easy to change the coordinates for a rectangle in the library, but it is much harder for other generic lines and shapes.
We will keep on thinking about this .....
Let me add one more thing: The "getBounds" method actually returns the "correct" value considering the behavior of the Canvas element. I know this doesn't help much.
That make sense. But so far I tested only shapes without outlines. I have a sprite that contains a simple rectangle or bitmap image 100x200 px. Then I'm getting the sprite size 102x202. In that scenario you include a line even it does not exist?
Hi Bernhard, Did you have a change to have a look it again. How hard it would be to set bounds to e.g. (x=150, y=250, w=200, h=100) not (x=149, y=249, w=202, h=102) if Sprite has only a basic shape or a bitmap. I don't mind keep current measurement if clip contains outlines. Do you think it's achievable?
Yes i thought about this every time i looked at the open issues. It is really a hard problem and there is no easy solution without drawbacks.
Thanks for looking at it. I'm sure it's not easy task. I'll try to understand better how stagexl works and maybe I find the solution myself.