LQCanvas Library Method
Short Description: Select 3D Canvas Size for Low Quality Mode
Signature: taccgl.LQCanvas (x,y,w,h)
Class: taccgl Class
Sets position and size of the low quality 3D canvas.
If taccgl™ detects that the animation is running slowly, it tries
to reduce the size of the 3D canvas. Reducing the size of the canvas will speed
up animations because less pixels need to be calculated and displayed.
This usually works quite well, but on the other hand the animation will
play only on a part of the screen / window.
If there are no performance problems taccgl™ will always
run full screen / window. If performance gets worse, it
first tries to use the portion selected
with NQCanvas or NQCanvas and if that
is not sufficent the portion selected
with LQCanvas or LQCanvas is used.
Using LQCanvas a rectangular portion of the screen/window can be seleted on
that a slow animation will play.
x,y give the pixel coordinates and w,h width and height.
All coordinates refer to pixel coordinates within the complete displayed
document. If (due to scrolling) the selected portion is not completely
visible it is moved to the visible part.
LQCanvas can be called while an animation is running, e.g. in an onscroll
event handler, to adapt the visible portion to the scroll position.
WebGL™ is a trademark of the Khronos Group Inc.
- Transformation Matrix
Previous Page: taccgl.NQCanvas
- Select 3D Canvas Size for Normal Quality Mode