Simple image manipulation is done through the Pixmap class. A Pixmap
object allows pixel-level access to an image. Pixmaps allow for saving
to a file and may be displayed using an Image object.
- Pixmap(filename)
- Constructs a Pixmap from the
image file, filename. See Image for supported file types.
- Pixmap(width, height)
- Constructs a Pixmap of the given
height and width. Initially, all pixels will be transparent.
- getWidth()
- Returns the width of the image in pixels.
- getHeight()
- Returns the height of the image in pixels.
- getPixel(x,y)
- Returns a triple (r,g,b) of the red,
green, and blue intensities of the pixel at (x,y). Intensity values
are in range(256).
- setPixel(x,y,color)
- Color is a triple (r,g,b)
representing a color for the pixel. Sets pixel at (x,y) to the given
color.
- save(filename)
- Saves the image in a file having the
given name. The format for the file is determined by the extension
on the filename (e.g. .ppm or .gif).
- clone()
- Returns a copy of the Pixmap.
John Zelle
2005-06-04
