/*
   draw10: user interface for selecting images
*/

import java.net.*;
import java.awt.*;
import java.util.*;

public class Draw10 extends Draw9
{
   // IMPLEMENT JUST THE USER INTERFACE FOR LOADING AND SELECTING IMAGES

   Item newItem() { return (Item)new Item10(); }

   Item10 item10(int i) { return (Item10)item[i]; }

   Color whiteScrim = new Color(255, 255, 255, 160);
   int nImgs = 0, imgAtMouse = 0;
   Image img[] = new Image[100];
   String imgName[] = new String[100];
   int rr, wr, nr, npy = 0, ipy = 0;
   ImageList imgList = new ImageList();

   public void renderInit() {
      super.renderInit();

      nImgs = imgList.data.length;
      for (int i = 0 ; i < nImgs ; i++) {
         String name = imgList.data[i];
         //img[i] = readImage("imgs/" + name);
         img[i] = readImage("http://mrl.nyu.edu/~perlin/drawing/imgs/" + name);
      }

      rr = 40;
      wr = w / rr * rr;
      nr = wr / rr;
      npy = nImgs / nr * rr;
      ipy = npy;
   }

   // DRAW AN IMAGE PALETTE OVER THE BACKGROUND.

   // AS MOUSE GOES IN OR OUT OF POSITIONAL RANGE FOR SELECTION FROM PALETTE,
   // GRADUALLY ROLL THE IMAGE PALETTE ON OR OFF THE SCREEN.

   public void renderBg() {
      super.renderBg();

      if (ipy < npy)
         for (int i = 0 ; i < nImgs ; i++) {
            int x = (i * rr) % wr + (w - wr)/2;
            int y = h - rr * (i / nr + 1) + ipy - 1;
            int b = i == imgAtMouse ? -1 : 3;
            g.drawImage(img[i], x + b, y + b, rr - b - b, rr - b - b, this);
            if (i == imgAtMouse) {
               setShadow(i);
               g.drawRect(x + b, y + b, rr - b - b - 1, rr - b - b - 1);
            }
            else {
               g.setColor(whiteScrim);
               g.fillRect(x + b, y + b, rr - b - b, rr - b - b);
            }
         }

      if (my >= h - (npy + rr)) {
         animating = ipy > 0;
         ipy = Math.max(0, ipy - (h-npy)/20);
      }
      else {
         animating = ipy < 3 * rr;
         ipy = Math.min(npy, ipy + (h-npy)/20);
      }
   }

   // COMPUTE WHICH IMAGE (IF ANY) IN IMAGE PALETTE IS AT THIS X,Y

   int imageAt(int x, int y) {
      if (rr == 0)
         return -1;
      x = Math.min(x, wr);
      x -= (w - wr) / 2;
      int n = x / rr + (h - y) / rr * nr;
      if (n < 0 || n >= nImgs)
         return -1;
      return n;
   }

   // MOUSE MOVEMENT HIGHLIGHTS THE IMAGE IN PALETTE AT THE CURSOR, IF ANY.

   public boolean mouseMove(Event e, int x, int y) {
      if (imageAt(x, y) != imgAtMouse) {
         imgAtMouse = imageAt(x, y);
         damage = true;
         return true;
      }
      return super.mouseMove(e, x, y);
   }

   // READ AN IMAGE FROM A URL OR FROM A LOCAL FILE

   Image readImage(String file) {
      try {
         if (file.length() >= 4 && file.substring(0,4).equals("http"))
            return getImage(new URL(file));
         return Toolkit.getDefaultToolkit().getImage(new URL(getCodeBase(), file));
      } catch (Exception e) { System.err.println(e); }
      return null;
   }
}