imagepanel.java

用JAVA写的一个拍照程序

package org.p3p.net.common;

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.image.BufferedImage;

import javax.swing.JPanel;
import javax.swing.SwingUtilities;

/**
 * 带背景面板
 */
public class ImagePanel extends JPanel implements MouseMotionListener,
		MouseListener {

	private Image bg;

	private boolean paintBG = true;

	private boolean paintSelectFlag = false;

	private Rectangle rect = null, rectL_T, rectR_B, rectR_T, rectL_B;// 选择范围

	private int lineSize = 10;

	private int dragTarget = -1;// 左上角

	private Point pyPoint = new Point(0, 0), txpyPoint = new Point(0, 0);

	/**
	 * Create the panel
	 */
	public ImagePanel() {
		super();
		//
	}

	public ImagePanel(String img) {
		super();
		setOpaque(true);
		MediaTracker mt = new MediaTracker(this);
		bg = UIHelper.getImage(img);
		mt.addImage(bg, 1);
		try {
			mt.waitForAll();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		addMouseMotionListener(this);
		addMouseListener(this);

	}

	public void paintComponent(Graphics g) {
		Graphics2D g2 = (Graphics2D) g;
		super.paintComponent(g2);
		// 执行一些初始化
		if (rect == null) {
			rect = new Rectangle(0, 0, 80, 80);
			rect.x = (getWidth() - 80) / 2;
			rect.y = (getHeight() - 80) / 2;

			// 当选择框变化时，需要及时更新此两个框的X，Y
			rectL_T = new Rectangle(rect.x, rect.y, lineSize, lineSize);

			rectR_B = new Rectangle(rect.x + rect.width - lineSize, rect.y
					+ rect.height - lineSize, lineSize, lineSize);

			rectR_T = new Rectangle(rect.x + rect.width - lineSize, rect.y,
					lineSize, lineSize);

			rectL_B = new Rectangle(rect.x, rect.y + rect.height - lineSize,
					lineSize, lineSize);

		}

		if (paintBG) {
			// 只绘制部分图像
			g2.drawImage(bg, 0, 0, getWidth(), getHeight(), txpyPoint.x / 10,
					txpyPoint.y / 10, txpyPoint.x / 10 + getWidth(),
					txpyPoint.y / 10 + getHeight(), null);

			if (paintSelectFlag) {
				// 画选择范围
				// g2.setColor(new Color(0x336699));
				g2.setStroke(new BasicStroke(4));
				// 左上
				g2.drawLine(rect.x, rect.y, rect.x, rect.y + lineSize);
				g2.drawLine(rect.x, rect.y, rect.x + lineSize, rect.y);
				// 右上
				g2.drawLine(rectR_T.x, rectR_T.y, rectR_T.x + rectR_T.width,
						rectR_T.y);
				g2.drawLine(rectR_T.x + rectR_T.width, rectR_T.y, rectR_T.x
						+ rectR_T.width, rectR_T.y + rectR_T.height);
				// 左下
				g2.drawLine(rectL_B.x, rectL_B.y, rectL_B.x, rectL_B.y
						+ rectL_B.height);
				g2.drawLine(rectL_B.x, rectL_B.y + rectL_B.height, rectL_B.x
						+ rectL_B.width, rectL_B.y + rectL_B.height);

				// 右下
				g2.drawLine(rect.x + rect.width - lineSize, rect.y
						+ rect.height, rect.x + rect.width, rect.y
						+ rect.height);
				g2.drawLine(rect.x + rect.width, rect.y + rect.height
						- lineSize, rect.x + rect.width, rect.y + rect.height);
			}
		}

	}

	/**
	 * 
	 * @param x
	 * @param y
	 * @param r
	 * @return
	 */
	private boolean inRectangle(int x, int y, Rectangle r) {
		return x > r.x && x < r.x + r.width && y > r.y && y < r.y + r.height;
	}

	/**
	 * 
	 * @param bg
	 */
	public void setBackground(Image bg) {
		this.bg = null;
		this.bg = bg;
	}

	public boolean isPaintBG() {
		return paintBG;
	}

	public void setPaintBG(boolean paintBG) {
		this.paintBG = paintBG;
	}

	public boolean isPaintSelectFlag() {
		return paintSelectFlag;
	}

	public void setPaintSelectFlag(boolean paintSelectFlag) {
		this.paintSelectFlag = paintSelectFlag;
	}

	public Rectangle getRect() {
		return rect;
	}

	public void setRect(Rectangle rect) {
		this.rect = rect;
	}

	public void mouseDragged(MouseEvent e) {
		// TODO 自动生成方法存根
		if (dragTarget < 0) {
			return;
		} else if (dragTarget == 0) {
			rectL_T.x = e.getX() - pyPoint.x;
			rectL_T.y = e.getY() - pyPoint.y;
			// 调整相关节点位置
			rectR_T.y = rectL_T.y;
			rectL_B.x = rectL_T.x;

			rect.width += rect.x - rectL_T.x;
			rect.height += rect.y - rectL_T.y;

			rect.x = rectL_T.x;
			rect.y = rectL_T.y;

		} else if (dragTarget == 3) {
			rectR_B.x = e.getX() - pyPoint.x;
			rectR_B.y = e.getY() - pyPoint.y;

			// 调整相关节点位置
			rectR_T.x = rectR_B.x;
			rectL_B.y = rectR_B.y;

			rect.width += rectR_B.x + rectR_B.width - rect.x - rect.width;
			rect.height += rectR_B.y + rectR_B.height - rect.y - rect.height;
		} else if (dragTarget == 4) {
			rect.x = e.getX() - pyPoint.x;
			rect.y = e.getY() - pyPoint.y;

			// 需要修改四个
			rectL_T.x = rect.x;
			rectL_T.y = rect.y;

			rectR_T.x = rect.x + rect.width - lineSize;
			rectR_T.y = rect.y;

			rectL_B.x = rect.x;
			rectL_B.y = rect.y + rect.height - lineSize;

			rectR_B.x = rect.x + rect.width - lineSize;
			rectR_B.y = rect.y + rect.height - lineSize;
		} else if (dragTarget == 9) {
			txpyPoint.x -= e.getX() - pyPoint.x;
			txpyPoint.y -= e.getY() - pyPoint.y;
		}
	}

	public void mouseMoved(MouseEvent e) {
		// TODO 自动生成方法存根

	}

	public void mouseClicked(MouseEvent e) {
		// TODO 自动生成方法存根

	}

	public void mouseEntered(MouseEvent e) {
		// TODO 自动生成方法存根

	}

	public void mouseExited(MouseEvent e) {
		// TODO 自动生成方法存根

	}

	public void mousePressed(MouseEvent e) {
		// TODO 自动生成方法存根
		dragTarget = -1;
		if (!paintSelectFlag) {
			dragTarget = 9;
			pyPoint.x = e.getX();
			pyPoint.y = e.getY();
			return;
		}

		if (inRectangle(e.getX(), e.getY(), rectL_T)) {
			dragTarget = 0;
			pyPoint.x = e.getX() - rectL_T.x;
			pyPoint.y = e.getY() - rectL_T.y;
		} else if (inRectangle(e.getX(), e.getY(), rectR_T)) {
			dragTarget = 1;
			pyPoint.x = e.getX() - rectR_T.x;
			pyPoint.y = e.getY() - rectR_T.y;
		} else if (inRectangle(e.getX(), e.getY(), rectL_B)) {
			dragTarget = 2;
			pyPoint.x = e.getX() - rectL_B.x;
			pyPoint.y = e.getY() - rectL_B.y;
		} else if (inRectangle(e.getX(), e.getY(), rectR_B)) {
			dragTarget = 3;
			pyPoint.x = e.getX() - rectR_B.x;
			pyPoint.y = e.getY() - rectR_B.y;
		} else if (inRectangle(e.getX(), e.getY(), rect)) {
			dragTarget = 4;
			pyPoint.x = e.getX() - rect.x;
			pyPoint.y = e.getY() - rect.y;
		} else {
			dragTarget = 9;
			pyPoint.x = e.getX();
			pyPoint.y = e.getY();
		}

	}

	public void mouseReleased(MouseEvent e) {
		// TODO 自动生成方法存根
		if (dragTarget > -1) {
			SwingUtilities.updateComponentTreeUI(this);
			pyPoint.x = 0;
			pyPoint.y = 0;
			dragTarget = -1;
		}
	}

	private Object obj = new Object();

	public void changeBGSize(int flag) {
		float zl = 1 + flag * 0.1f;
		int w = (int) (bg.getWidth(this) * zl), h = (int) (bg.getHeight(this) * zl);
		if (w <= 0 || h <= 0) {
			return;
		}
		synchronized (obj) {
			Image __bg = bg.getScaledInstance(w, h, Image.SCALE_SMOOTH);
			setBackground(__bg);
			repaint();
		}

	}

	/**
	 * 返回选择图像
	 * 
	 * @return
	 */
	public BufferedImage getSelectedImage() {
		// 取得选择的图像
		Rectangle selectedRect = null;
		if (!paintSelectFlag) {
			selectedRect = new Rectangle(0, 0, getWidth(), getHeight());
		} else {
			selectedRect = rect;
		}
		BufferedImage img = new BufferedImage(selectedRect.width,
				selectedRect.height, BufferedImage.TYPE_3BYTE_BGR);
		Graphics2D g = (Graphics2D) img.getGraphics();

		// 只画局部 需要添加偏移量
		g.drawImage(bg, 0, 0, selectedRect.width, selectedRect.height,
				selectedRect.x + txpyPoint.x / 10, selectedRect.y + txpyPoint.y
						/ 10, selectedRect.x + selectedRect.width + txpyPoint.x
						/ 10, selectedRect.y + selectedRect.height
						+ txpyPoint.y / 10, null);

		g = null;
		return img;
	}
}