ingo@535: package de.intevation.flys.client.shared;
ingo@535: 
ingo@535: import java.io.Serializable;
ingo@535: 
ingo@610: import com.google.gwt.core.client.GWT;
ingo@610: 
ingo@535: 
ingo@535: /**
ingo@535:  * This object supports a linear transformation to transform xy coordinates into
ingo@535:  * an other coordinate system based on scale and translation values.
ingo@535:  *
ingo@535:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
ingo@535:  */
ingo@535: public class Transform2D implements Serializable {
ingo@535: 
ingo@535:     protected double sx;
ingo@535:     protected double sy;
ingo@535: 
ingo@535:     protected double tx;
ingo@535:     protected double ty;
ingo@535: 
ingo@535: 
ingo@535:     public Transform2D() {
ingo@535:     }
ingo@535: 
ingo@535: 
ingo@535:     /**
ingo@535:      * Creates a new transformation with scale and translation factors.
ingo@535:      *
ingo@535:      * @param sx The scale factor for the x axis.
ingo@535:      * @param sy The scale factor for the y axis.
ingo@535:      * @param tx The translation factor for the x axis.
ingo@535:      * @param ty The translation factor for the y axis.
ingo@535:      */
ingo@535:     public Transform2D(double sx, double sy, double tx, double ty) {
ingo@535:         this.sx  = sx;
ingo@535:         this.sy  = sy;
ingo@535:         this.tx  = tx;
ingo@535:         this.ty  = ty;
ingo@535:     }
ingo@535: 
ingo@535: 
ingo@535:     /**
ingo@535:      * Transforms the pixel x and y into a new coordinate system based on the
ingo@535:      * scale and translation values specified in the constructor.
ingo@535:      */
ingo@535:     public double[] transform(double x, double y) {
ingo@535:         double resX = sx * x + tx;
ingo@535:         double resY = sy * y + ty;
ingo@535: 
ingo@535:         return new double[] { resX, resY };
ingo@535:     }
ingo@610: 
ingo@610: 
ingo@610:     public void dumpGWT() {
ingo@610:         GWT.log("SX = " + sx);
ingo@610:         GWT.log("SY = " + sy);
ingo@610:         GWT.log("TX = " + tx);
ingo@610:         GWT.log("TY = " + ty);
ingo@610:     }
ingo@535: }
ingo@535: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :