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/*  Copyright 1999 Vince Via [email protected]
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/
package com.viaoa.image;

import java.awt.*;
import java.awt.image.*;

import javax.swing.*;

/**
    Resizes an image so that it meets a max Width or Height.
*/
public class ScaledImageIcon implements Icon {
    Icon icon;
    int w,h, maxW, maxH;
    double scale = 0.0;
    Image imgScaled;

    /**
     * @param icon
     * @param maxW if 0 then it is ignored
     * @param maxH if 0 then it is ignored
     */
    public ScaledImageIcon(Icon icon, int maxW, int maxH) {
    	this.icon = icon;
    	this.maxW = maxW;
    	this.maxH = maxH;
    	if (icon != null) {
    		h = icon.getIconHeight();
    		w = icon.getIconWidth();
    	}
    	if (w == 0) w = 1;
    	if (h == 0) h = 1;
    	if (maxW == 0) this.maxW = w;
    	if (maxH == 0) this.maxH = h;
    	
		double d1=1, d2=1;
		if (maxW != 0) {
			d1 = (double) ((double)this.maxW)/((double)w); 
			this.scale = d1;
		}
		if (maxH != 0) {
			d2 = (double) ((double)this.maxH)/((double)h);
			this.scale = d2;
		}
		if (maxH > 0 && maxW > 0) {
			this.scale = Math.min(d1, d2);
		}
    }
        
    public int getIconHeight() {
        int x = (int) ((double)((double)h)*scale);
        return x;
    }
    public int getIconWidth() {
        int x = (int) ((double)((double)w)*scale);
        return x;
    }
    
    private BufferedImage bi;
    public Image getImage() {
    	if (bi == null) {
    		int h = getIconHeight();
    		int w = getIconWidth();
    		
    		bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
    	
	        Graphics g2 = bi.getGraphics();
	        g2.setColor(new Color(0,0,0,0));  // make sure transparency works
	        g2.fillRect(0, 0, w, h);
	        ((Graphics2D)g2).scale(scale, scale);
	        
	        if (icon != null) icon.paintIcon(null, g2, 0, 0);
    	}
    	return bi;
    }
    
    public void paintIcon(Component c, Graphics g, int x, int y) {
        g.drawImage(getImage(), x, y, null);
    }
}