lgcanvas.java

applet 绘图板 applet 绘图板 applet 绘图板 applet 绘图板 applet 绘图板

import java.applet.Applet;
import java.awt.*;
import java.io.PrintStream;

class lgcanvas extends Canvas {

	public lgcanvas(int i, int j, lgpaint lgpaint1, Choice choice,
			Choice choice1) {
		offImage = null;
		firstTime = true;
		x = 0;
		y = 0;
		lastX = 0;
		lastY = 0;
		xCenter = 0;
		yCenter = 0;
		w = 0;
		h = 0;
		moveX = 0;
		moveY = 0;
		resize(i, j);
		parent = lgpaint1;
		mode = 1;
	}

	public void clear() {
		firstTime = true;
		lastX = -1;
		lastY = -1;
	}

	public void draw(int i, int j) {
		if (i > d.width)
			i = d.width;
		if (i < -w)
			i = -1;
		if (j > d.height)
			j = d.height;
		if (j < -h)
			j = -1;
		if (mode == 1)
			offGraphics.drawLine(lastX, lastY, i, j);
		lastX = i;
		lastY = j;
		repaint();
	}

	public void erase() {
		Color color = offGraphics.getColor();
		offGraphics.setColor(Color.gray);
		offGraphics.fillRect(0, 0, d.width, d.height);
		repaint();
		offGraphics.setColor(color);
	}

	public void mode(int i) {
		mode = i;
	}

	public boolean mouseDown(Event event, int i, int j) {
		set(i, j);
		return true;
	}

	public boolean mouseDrag(Event event, int i, int j) {
		draw(i, j);
		return true;
	}

	public boolean mouseMove(Event event, int i, int j) {
		move(i, j);
		return true;
	}

	public boolean mouseUp(Event event, int i, int j) {
		clear();
		return true;
	}

	public void move(int i, int j) {
		moveX = i;
		moveY = j;
		repaint();
	}

	public void paint(Graphics g) {
		offGraphics.fill3DRect(0, 0, d.width, 5, true);
		if (offImage != null)
			g.drawImage(offImage, 0, 0, this);
		if (mode == 2 && image != null)
			g.drawImage(image, moveX - image.getWidth(this) / 2, moveY
					- image.getHeight(this) / 2, this);
	}

	public void set(int i, int j) {
		if (mode == 2 && image != null)
			offGraphics.drawImage(image, i - image.getWidth(this) / 2, j
					- image.getHeight(this) / 2, this);
		lastX = i;
		lastY = j;
		draw(i, j);
	}

	public void setBackground(int i) {
		background = parent.getImage(parent.getDocumentBase(), "back" + i
				+ ".jpg");
		MediaTracker mediatracker = new MediaTracker(this);
		mediatracker.addImage(background, 0);
		try {
			mediatracker.waitForID(0);
		} catch (InterruptedException _ex) {
		}
		if (background != null) {
			offGraphics.drawImage(background, 0, 0, d.width, d.height, this);
			repaint();
		}
	}

	public void setMyColor(Color color) {
		offGraphics.setColor(color);
	}

	public void setStamp(int i) {
		image = parent.getImage(parent.getDocumentBase(), "stamp" + i + ".gif");
		MediaTracker mediatracker = new MediaTracker(this);
		mediatracker.addImage(image, 0);
		try {
			mediatracker.waitForID(0);
		} catch (InterruptedException _ex) {
		}
	}

	public void setup() {
		d = getSize();
		setBackground(Color.white);
		System.err.println("Larry's Paint canvas size: " + d.width + " x "
				+ d.height);
		if (offImage == null) {
			offImage = createImage(d.width, d.height);
			offGraphics = offImage.getGraphics();
		}
		offGraphics.setColor(Color.gray);
		offGraphics.fillRect(0, 0, d.width, d.height);
		offGraphics.setColor(Color.black);
	}

	public void update(Graphics g) {
		paint(g);
	}

	public final int COLOR = 1;

	public final int STAMP = 2;

	public final int BACKGROUND = 3;

	private Dimension d;

	private Image offImage;

	private Graphics offGraphics;

	private Image image;

	private Image background;

	private lgpaint parent;

	private boolean firstTime;

	private int x;

	private int y;

	private int lastX;

	private int lastY;

	private int xCenter;

	private int yCenter;

	private int w;

	private int h;

	private int moveX;

	private int moveY;

	private int mode;

	private Choice choices;

	private Choice selections;
}