// mas964 ps4
// .5 second animation connecting two mouseclicks

import java.applet.*;
import java.awt.*;
import java.lang.Math;
import java.lang.String;
import TwoPointAnimator;

public class TwoPointShort extends TwoPointAnimator {
  protected int pointDistance, maxDimension, minBlockSize, maxNumBlocks;
  
  public void drawFrame(int ms) {
    Graphics g = imageBuffer.getGraphics();
    this.clearImageBuffer();
    g.setColor(this.getForeground());

    // draw blocks at either end
    int numBlocks = maxNumBlocks * ms / animationLength;
    int size = minBlockSize * 3 - 2 * minBlockSize * ms / animationLength;
    g.fillRect(x1 - size/2, y1 - size/2, size, size);
    g.fillRect(x2 - size/2, y2 - size/2, size, size);

    int i;
    for (i = 1; i < numBlocks; i++) {
      int x, y;
      x = x1 + (x2 - x1) * i / numBlocks;
      y = y1 + (y2 - y1) * i / numBlocks;
      g.fillRect(x - size/2, y - size/2, size, size);
    }
    
    repaint(); 
  }

  // precalculate the distance between the two dots
  public void start() {
    if (numButtonsPressed == 2) {
      maxDimension= Math.max(imageBufferSize.width, imageBufferSize.height);
      pointDistance = (int)Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));
      minBlockSize = maxDimension / 75;
      maxNumBlocks = pointDistance / (minBlockSize * 2);
    }
    super.start();
  }
  
  public void init() {
    this.setBackground(Color.white);
    this.setForeground(Color.black);
    super.init();
    if (frameDelay == 0 || animationLength == 0) {
      frameDelay = 30;
      animationLength = 500;
    }
  }
}