BlitzPlus Docs -> ScaleImage

ScaleImage image,xscale#,yscale#

Parameters:

image = file handle variable to a previously loaded image
xscale# = the amount to scale the image horizontally
yscale# = the amount to scale the image vertically

Description:

Use this command to rescale an image to a new size using a floating point percentage (1.0 = 100%, 2.0 = 200%, etc). Using a negative value perform image flipping. You must've previously loaded the image with LoadImage or LoadAnimImage.

This is NOT intended for REAL TIME scaling of images! Precalculate your images before running your program, or you will likely see massively slow renderings of graphics.

Example:

; ScaleImage example

; Set Graphics Mode
Graphics 800,600,16

; Randomize the random seed
SeedRnd MilliSecs()

; Load an image to tile (your location might vary)
gfxBall=LoadImage("C:Program FilesBlitz Basicsamplesall.bmp")

; Scale it randomly from 50% to 150% both x and y
ScaleImage gfxBall,Rnd(-2.0,2.0),Rnd(-2.0,2.0)

; Wait for ESC to hit
While Not KeyHit(1)
DrawImage gfxball,Rnd(800),Rnd(600)
VWait 
Wend 

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