lineobj.java

基于jxta的局域网P2P文件共享,可以实现局域网中的文件p2p共享,实现文件快速传输及交流

package connex.plugins.whiteboard;

import java.awt.RenderingHints;
import java.awt.Graphics2D;
import java.awt.Color;
import java.awt.geom.Line2D;

import java.awt.Point;
import java.awt.Rectangle;
import java.awt.BasicStroke;

/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2006</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */
class LineObj
    extends ShapeObj {

  public void draw() {
    if (start == null || end == null) {
      return;
    }

    draw(start, end);
  }

  public void draw(Point start, Point end) {
    this.start = start;
    this.end = end;

    g2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                         RenderingHints.VALUE_ANTIALIAS_ON);

    if (select != 0) {
      drawSelection();
    }
    else {

      g2D.setColor(drawColor);
      g2D.drawLine(start.x, start.y, end.x, end.y);

    }
    lastS= new Point (start);
    lastE= new Point (end);
  }

  public void fill(Color fillColor) {
    drawColor = fillColor;
    g2D.setColor(fillColor);
    draw();
  }

  protected void drawSelection() {
    BasicStroke stroke = new BasicStroke(1.0f);
    float dash1[] = {
        2.0f};
    BasicStroke dashed = new BasicStroke(1.0f,
                                         BasicStroke.CAP_BUTT,
                                         BasicStroke.JOIN_MITER,
                                         10.0f, dash1, 0.0f);
    g2D.setStroke(dashed);
    if(lastS!=null){
      if (!lastE.equals(end) || !lastS.equals(start)) {
        g2D.setColor(Color.MAGENTA);
        g2D.setXORMode(Color.white);
        g2D.drawLine(lastS.x, lastS.y, lastE.x, lastE.y);
        g2D.fillRect(lastS.x - 2, lastS.y - 2, 5, 5);
        g2D.fillRect(lastE.x - 2, lastE.y - 2, 5, 5);
      }
    }
    g2D.setColor(Color.MAGENTA);
    g2D.drawLine(start.x, start.y, end.x, end.y);
    g2D.fillRect(start.x - 2, start.y - 2, 5, 5);
    g2D.fillRect(end.x - 2, end.y - 2, 5, 5);

  }

  public boolean SelectShape(Point pt) {
    double px = pt.x;
    double py = pt.y;

    if (px - start.x < 5 && px - start.x > -5 && py - start.y < 5 &&
        py - start.y > -5) {
      this.select = 1;

      return true;
    }
    if (px - end.x < 5 && px - end.x > -5 && py - end.y < 5 && py - end.y > -5) {
      select = 2;

      return true;
    }

    if (new Line2D.Double(start, end).ptLineDist(pt) <= 2) {
      select = 3;
      return true;
    }
    return false;
  }

  public void move(Point pt, Point pt2) {
    int tmpx = pt.x - pt2.x;
    int tmpy = pt.y - pt2.y;

    if (select == 1) {
      start.setLocation(pt);
    }
    if (select == 2) {
      end.setLocation(pt);
    }

    if (select == 3) {
      start.x += tmpx;
      start.y += tmpy;
      end.x += tmpx;
      end.y += tmpy;
    }

    draw(start, end);

  }

}