imageShearDrawingAxis

Description

Shears the drawing canvas.

History

ColdFusion 8: Added this function.

Syntax

ImageShearDrawingAxis(name, shx, shy)

Attributes

Attribute	Description	Required	Default
name	Required. The ColdFusion image on which this operation is performed.
shx	Required. The multiplier by which coordinates are shifted in the positive x axis direction as a function of the y coordinate.
shy	Required. the multiplier by which coordinates are shifted in the positive y axis direction as a function of the x coordinate.

Returns

Nothing.

Usage

For each pixel (x,y) of the destination, the source value at the fractional subpixel position (x',y') is constructed with an interpolation object and written to the destination.
If the direction parameter is equal to horizontal,x' = (x - y*shear) and y' = y.
If the direction parameter is equal to vertical,x' = x and y' = (y - x*shear).
Use the ImageSetAntialiasing function to improve the quality of the rendered image.

Example

<!--- Create a ColdFusion image from an existing JPEG file. ---> 
<cfimage source="../cfdocs/images/artgallery/paul03.jpg" name="myImage"> 
<!--- Turn on antialiasing to improve image quality. ---> 
<cfset ImageSetAntialiasing(myImage,"on")> 
<!--- Set the shear drawing axis. ---> 
<cfset ImageShearDrawingAxis(myImage,0.5,0.5)> 
<!--- Draw a rectangle on the image with the shear settings. ---> 
<cfset ImageDrawRect(myImage,50,50,50,50)> 
<!--- Display the image in a browser. ---> 
<cfimage source="#myImage#" action="writeToBrowser">

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