jvideocomponent.java

FMJ（freedom media for java)是java视频开发的新选择

package net.sf.fmj.media.renderer.video;

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;

import javax.swing.JComponent;

/**
 * JComponent used for rendering video images.
 * 
 * TODO keep the aspect ratio provided by video format
 * TODO provide controls for scaling interpolation quality
 */
public final class JVideoComponent extends JComponent {
	
	private Image image;
	//private VideoFormat inputFormat;
	
	//private Object interpolationHint = RenderingHints.VALUE_INTERPOLATION_BICUBIC;

	public JVideoComponent() {
		setDoubleBuffered(false);
		setOpaque(false);
	}

	/*
	public void setInputformat(VideoFormat format) {
		this.inputFormat = format;
	}
	*/
	
	public void setImage(Image image) {
		this.image = image;
		repaint();
	}
	
	/*
	public Dimension getPreferredSize() {
		if (inputFormat == null) {
			return super.getPreferredSize();
		}
		VideoFormat videoFormat = (VideoFormat) inputFormat;
		return videoFormat.getSize();
	}
	*/

	protected void paintComponent(Graphics g) {
		//super.paintComponent(g);
		
		Graphics2D g2d = (Graphics2D) g;
		
		if (image != null) {
			int x, y;
			int w, h;
			Dimension preferredSize = getPreferredSize();
			Dimension size = getSize();
			if ((float)size.width  / preferredSize.width < (float)size.height / preferredSize.height) {
				w = size.width;
				h = size.width * preferredSize.height  / preferredSize.width;
				x = 0;
				y = (size.height-h)/2;
			}
			else {
				w = size.height * preferredSize.width / preferredSize.height;
				h = size.height;					
				x = (size.width-w)/2;
				y = 0;
			}
			//g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
			//g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
			//g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, interpolationHint);
			g.drawImage(image, x, y, w, h, null);
		}
	}		
}