/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* *
* AndroidWorld Library, Copyright 2011 Bryan Chadwick *
* *
* FILE: ./android/image/OverlayXY.java *
* *
* This file is part of AndroidWorld. *
* *
* AndroidWorld is free software: you can redistribute it and/or *
* modify it under the terms of the GNU General Public License *
* as published by the Free Software Foundation, either version *
* 3 of the License, or (at your option) any later version. *
* *
* AndroidWorld is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with AndroidWorld. If not, see . *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
package android.image;
import android.world.Posn;
import android.graphics.Canvas;
/**
*
*
* Represents the Overlaying of two images with the given offset.
*
*
* new OverlayXY(new Rectangle(20, 20, "outline", "black"),
* 20, 0, new Rectangle(20, 20, "outline", "black"))
* 
*
*
*
* new OverlayXY(new Rectangle(20, 20, "solid", "red"),
* 20, 20,
* new Rectangle(20, 20, "solid", "black"))
* 
*
*
*
* new OverlayXY(new Rectangle(20, 20, "solid", "red"),
* -20, -20,
* new Rectangle(20, 20, "solid", "black"))
* 
*
*
*
* new OverlayXY(
* new OverlayXY(new Ellipse(40, 40, "outline", "black"),
* 10, 15, new Ellipse(10, 10, "solid", "forestgreen")),
* 20, 15, new Ellipse(10, 10, "solid", "forestgreen"))
* 
*
*
*
* Image overlays are also available as a method on Images.
*
*
* new Rectangle(20, 20, "outline", "black")
* .overlayxy(new Rectangle(20, 20, "outline", "black"), 20, 0)
* 
*
*
*
* new Rectangle(20, 20, "solid", "black")
* .overlayxy(new Rectangle(20, 20, "solid", "red"), 20, 20)
* 
*
*
*
* new Rectangle(20, 20, "solid", "black")
* .overlayxy(new Rectangle(20, 20, "solid", "red"), -20, -20)
* 
*
*
*
* new Ellipse(10, 10, "solid", "forestgreen")
* .overlayxy(20, 15, new Ellipse(10, 10, "solid", "forestgreen")
* .overlayxy(10, 15, new Ellipse(40, 40, "outline", "black"))
* 
*
*
*/
public class OverlayXY extends Overlay{
private double dx, dy;
private double tx, ty;
/** Construct an OverlayXY from the two images and the offset (X,Y) */
public OverlayXY(Image top, int x, int y, Image bot){
this(top,(double)x,y,bot);
}
/** Construct an OverlayXY from the two images and the Posn offset */
public OverlayXY(Image top, Posn p, Image bot){
this(top,p.x,p.y,bot);
}
/** Construct an OverlayXY from the two images and the offset (X,Y) */
public OverlayXY(Image top, double x, double y, Image bot){
super(top,bot,
calcwidth(top,bot,x),
calcheight(top,bot,y));
this.dx = x;
this.dy = y;
// Where to draw the Top image...
this.tx = -pinholeX+top.pinholeX;
if(top.width() > bot.width()+dx)
this.tx = pinholeX-top.pinholeX;
this.ty = -pinholeY+top.pinholeY;
if(top.height() > bot.height()+dy)
this.ty = pinholeY-top.pinholeY;
}
private static double calcwidth(Image t, Image b, double dx){
return Math.max(t.width(), b.width()+dx)-((dx < 0)?dx:0);
}
private static double calcheight(Image t, Image b, double dy){
return Math.max(t.height(), b.height()+dy)-((dy < 0)?dy:0);
}
/** Draw this OverlayXY image into a Graphics */
public void paint(Canvas c, int xx, int yy){
bot.paint(c, round(xx+tx+dx+bot.pinholeX-top.pinholeX),
round(yy+ty+dy+bot.pinholeY-top.pinholeY));
top.paint(c, round(xx+tx), round(yy+ty));
}
}