TFormImage

TFormImage

Command Index · BlitzBasic · Images

TFormImage:Void image:Int32, a:Float32, b:Float32, c:Float32, d:Float32

Parameter	Mode	Type	Default	Description
image	In	Int32	required	The image.
a	In	Float32	required	Horizontal part of the first column of the matrix.
b	In	Float32	required	Vertical part of the first column of the matrix.
c	In	Float32	required	Horizontal part of the second column of the matrix.
d	In	Float32	required	Vertical part of the second column of the matrix.

Description

Transforms every frame of an image with a 2x2 matrix. With the values a, b, c, d a point (x, y) of the picture, measured from the handle, goes to (a*x + c*y, b*x + d*y). The matrix a=1, b=0, c=0.6, d=1 tilts the picture to the right, and ScaleImage and RotateImage are special cases. The image becomes as large as the result needs.

Differences

• A matrix that cannot be inverted (for example a=0, b=0) stops the program with an error message.

Examples

Graphics 320, 240, 0, 2
SetBuffer BackBuffer()
Local img = CreateImage(60, 60)
SetBuffer ImageBuffer(img)
Color 255, 160, 0
Rect 0, 0, 60, 60, 1
Color 0, 0, 0
Oval 15, 15, 30, 30, 1
SetBuffer BackBuffer()
Local tilted = CopyImage(img)
MidHandle tilted
TFormImage tilted, 1, 0, 0.6, 1
Cls
DrawImage img, 40, 90
DrawImage tilted, 200, 120
Flip
WaitKey

Media

Related Commands

CopyImage, CreateImage, DrawImage, FreeImage, GrabImage, HandleImage, LoadAnimImage, TFormFilter

Command Index · BlitzBasic · Images