Format
Crop(x1,y1,x2,y2)
Args
x1,y1: Coordinates of one corner of the rectangle (1,1 is the lower left)x2,y2: Coordinates of the other corner
A portion of the current icon is cropped (cut). If the crop region extends outside the icon, it will be padded with transparent pixels.
If using the TILED_ICON_MAP value for map_format, all icons must be even multiples of world.tile_size, so the icon will be padded with transparent pixels to the top and right as needed.
// start with a simple icon
var/icon/I = new('circle.dmi')
// take the upper right 16x16 chunk
I.Crop(17,17,32,32)
// that chunk now appears in the lower left corner
icon = I