Application: gvSIG desktop

package org.gvsig.expressionevaluator.impl.function.image;

import java.awt.geom.AffineTransform;

import org.apache.commons.lang3.Range;

import org.gvsig.expressionevaluator.ExpressionRuntimeException;

import org.gvsig.expressionevaluator.Interpreter;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

public class ImageTransformFunction extends AbstractFunction {

    public ImageTransformFunction() {

        super(

                "Image", "IMAGETRANSFORM", Range.between(2, 4),

                "",

                "IMAGETRANSFORM({{image}})",

                new String[]{

                    "image",

                    "transform",

                    "width - Optional.",

                    "height - Optional."

                },

                "SimpleImage",

                false

        );

    }

    @Override

    public boolean allowConstantFolding() {

        return true;

    }

    @Override

    public Object call(Interpreter interpreter, Object[] args) {

        Object source = this.getObject(args, 0);

        AffineTransform transform = (AffineTransform) this.getObject(args, 1);

        SimpleImage image = ImageReadFunction.createSimpleImage(source);

        if( image.isEmpty() ) {

            return null;

        }

        switch(args.length) {

            case 2:

                image = image.transform(transform);

                break;

            case 4:

                int width = this.getInt(args, 2);

                int height = this.getInt(args, 3);

                image = image.transform(transform, width, height);

                break;

            default:

                throw new ExpressionRuntimeException(

                        null, 

                        "Incorrect number of arguments", 

                        "The IMAGETRANSFORM function has 2 arguments, image and transform, or 4 arguments, image, transform, width and height."

                );

        }

        return image;

    }

}