Texture functions used for displaying images

mglCreateTexture: Create a texture from a matrix

purpose: Create a texture for display on the screen with mglBltTexture image can either be grayscale nxm, color nxmx3 or color+alpha nxmx4
usage: texture = mglCreateTexture(image,axis)

argument value
image nxm matrix of grayscale values from 0 to 255, or nxmx3 matrix of RGB values or nxmx4 of RGBA values
axis 'xy' rows are x and columns are y dimension (default–matlab oriented matrix, i.e. will give you the same results as using imagesc), 'yx' rows are y and columns are x dimension
OUTPUT: texture a texture structure that can be drawn to the screen using mglBltTexture
mglOpen;
mglClearScreen
mglScreenCoordinates
texture = mglCreateTexture(round(rand(100,100)*255));
mglBltTexture(texture,[0 0]);
mglFlush;

mglBltTexture: Draw the texture to the screen

purpose: Draw a texture to the screen in desired position.
usage: mglBltTexture(texture,position,<hAlignment>,<vAlignment>,<rotation>)

argument value
texture A texture structure created by mglCreateTexture or mglText.
position Either a 2-vector [xpos ypos] or 4-vector [xpos ypos width height]. units are degrees.
hAlignment -1 = left, 0 = center, 1 = right (defaults to center)
vAlignment -1 = top, 0 = center, 1 = bottom (defaults to center)
rotation rotation in degrees, defaults to 0

To display several textures at once, texture can be an array of n textures, position is nx2, or nx4 and hAlignment, vAlignment and rotation are either a single value or an array of n.

multiple textures:

 mglOpen;
 mglVisualAngleCoordinates(57,[16 12]);
 image = rand(200,200)*255;
 imageTex = mglCreateTexture(image);
 mglBltTexture([imageTex imageTex],[-3 0;3 0],0,0,[-15 15]);
 mglFlush;

single textures

 mglOpen;
 mglVisualAngleCoordinates(57,[16 12]);
 image = rand(200,200)*255;
 imageTex = mglCreateTexture(image);
 mglBltTexture(imageTex,[0 0]);
 mglFlush;

mglDeleteTexture: Delete a texture

purpose: Deletes a texture. This will free up memory for textures that will not be drawn again. Note that when you call mglClose texture memory is freed up. You only need to call this if you are running out of memory and have textures that you do not need to use anymore.
usage: mglDeleteTexture(tex)

argument value
tex The texture created by mglCreateTexture that you want to delete
 mglOpen;
 mglClearScreen
 mglScreenCoordinates
 texture = mglCreateTexture(round(rand(100,100)*255));
 mglBltTexture(texture,[0 0]);
 mglFlush;
 mglDeleteTexture(texture);
software/mgl/functionreferenceimages.txt · Last modified: 2009/05/01 13:32 (external edit)
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