001    package railo.runtime.functions.image;
002    
003    import railo.runtime.PageContext;
004    import railo.runtime.exp.FunctionException;
005    import railo.runtime.exp.PageException;
006    import railo.runtime.img.Image;
007    import railo.runtime.op.Caster;
008    
009    public class ImageSetDrawingAlpha {
010    
011            public static String call(PageContext pc, Object name, double alpha) throws PageException {
012                    if(name instanceof String) name=pc.getVariable(Caster.toString(name));
013                    Image img = Image.toImage(name);
014                    
015                    if(alpha<0 || alpha>1)
016                            throw new FunctionException(pc,"ImageSetDrawingAlpha",2,"alpha","alpha must be a value between 0 and 1");
017                            
018                    
019                    img.setAlpha((float)alpha);
020                    return null;
021            }
022    }