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DEVELOPING COLDFUSION 9 APPLICATIONS
Working with Documents, Charts, and Reports
<!--- This example shows how to create a watermark from an existing image. --->
<!--- Create two ColdFusion images from existing JPEG files. --->
<cfimage source="../cfdocs/images/artgallery/raquel05.jpg" name="myImage">
<cfimage source="http://www.google.com/images/logo_sm.gif" name="myImage2">
<cfimage source="#myImage#" action="write" destination="logo.jpg" overwrite="yes">
<cfset ImageSetDrawingTransparency(myImage,50)>
<!--- Paste myImage2 on myImage at the coordinates (0,0). --->
<cfset ImagePaste(myImage,myImage2,0,0)>
<!--- Write the result to a file. --->
<cfimage source="#myImage#" destination="watermark.jpg" action="write" overwrite="yes">
<!--- Display the result. --->
<img src="watermark.jpg"/>
Creating a watermark from a text image
The following example shows how to create a text image in ColdFusion and use it as a watermark:
<!--- Create a ColdFusion image from an existing JPG file. --->
<cfset myImage=ImageNew("../cfdocs/images/artgallery/raquel05.jpg")>
<!--- Scale the image to fit in a 200-pixel square, maintaining the aspect ratio of the
source image. --->
<cfset ImageScaleToFit(myImage,200,200)>
<!--- Set the drawing transparency to 75%. --->
<cfset ImageSetDrawingTransparency(myImage,75)>
<!--- Create a ColdFusion image from scratch. --->
<cfset textImage=ImageNew("",150,140)>
<!--- Set the drawing color to white. --->
<cfset ImageSetDrawingColor(textImage,"white")>
<!--- Create a collection of text attributes. --->
<cfset attr=StructNew()>
<cfset attr.size=40>
<cfset attr.style="bold">
<cfset attr.font="Arial">
<!--- Turn on antialiasing. --->
<cfset ImageSetAntialiasing(textImage)>
<!--- Draw the text string "PROOF" on the ColdFusion image. Apply the text attributes that
you specified. --->
<cfset ImageDrawText(textImage,"PROOF",1,75,attr)>
<!--- Rotate the text image by 30 degrees. --->
<cfset ImageRotate(textImage,30)>
<!--- Scale the image to fit in a 200-pixel square, maintaining the aspect ratio of the
source image. --->
<cfset ImageScaleToFit(textImage,200,200)>
<!--- Paste the text image onto myImage. --->
<cfset ImagePaste(myImage,textImage,0,0)>
<!--- Write the combined image to a file. --->
<cfimage source="#myImage#" action="write" destination="test_watermark.jpg" overwrite="yes">
<!--- Display the image. --->
<img src="test_watermark.jpg"/>
Creating a watermark from a ColdFusion drawing
The following example shows how to draw an image in ColdFusion and use it as a watermark. You use the
function to define the attributes of lines and shapes you create with drawing functions and
ImageSetDrawingStroke
the
ImageSetDrawingColor
function to define the color.
Last updated 8/5/2010
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