containment

What is containment?
Containment in uiz is making sure that objects don't draw outside the locations they are supposed to draw.

For example, you might have an object with a size of 500x500, inside a frame that is only 100x100.
Uiz will then detect that there is a bigger object inside another smaller object.
It will then make sure that the big object won't draw outside the canvas of the frame.

How does containment work?
First uiz checks if an object exceeds any boundaries. This check is partly done in the uiz_fix functions.
If the object is completely outside of boundaries and shouldn't be visible, the drawing of the object is disabled.
If the object is partly within boundaries, and partly outside of them, a containment method will be used.
There are 2 ways of containing something in uiz: shaders and surfaces.
Shaders are the default way to handle containment as it is faster and doesn't use any extra ram.
However, some systems don't support shaders or you are using code that isn't compatible with shaders.
In such cases uiz will use surfaces instead of shaders to contain objects.
For containment to work, the code "if uiz_cntn() then{" at the beginning, and "uiz_containend()}" at the end of the draw event of an uiz object is needed.
Please don't put any if statements higher up, as there is still some important code within the uiz_cntn() that could conflict with other objects if not called.

Manipulating containment.
Sometimes you are using shaders yourself and you don't want a certain object to use shaders.
In that case you can set the variable uiz_shader to 0. This variable must be set on an object and will only apply to that object, not it's children.
You can also force containment using the variable forcecontain on any uiz object.