import objectdraw.*;
import java.awt.*;

public class Tree extends ActiveObject {
    // # of leaves to generate
    private static final int NUM_LEAVES = 150;
    
    // the canvas
    private DrawingCanvas aCanvas;     
    
    // pictures of a leaf
    private Image leafPic; 
    
    // Dimensions of screen
    private int aScreenWidth, aScreenHeight;
    
    // used to generate random speeds and positions for leaves
    private RandomIntGenerator leafLocGen;
    
    // used to generate random speeds and positions for leaves
    private RandomDoubleGenerator leafSpeedGen;
    
    // Remember parameters and create random number generators
    // in order to create leaves 
    public Tree( Image aLeafPic,
            int screenWidth, int screenHeight,
            DrawingCanvas canvas) {
        
        aCanvas = canvas;
        leafPic = aLeafPic;
        aScreenWidth = screenWidth;
        aScreenHeight = screenHeight;
        
        leafLocGen = new RandomIntGenerator( 0, screenWidth);
        leafSpeedGen = new RandomDoubleGenerator( 2, 5);
        
        start();
    }
    
    // Successively create leaves which will fall 
    // to ground
    public void run() {
        RandomIntGenerator picker = new RandomIntGenerator(0,1);
        for (int treeCount = 0;        
        treeCount < NUM_LEAVES;
        treeCount++) {
            // create a leaf
            int next = picker.nextValue();
            if (next == 0) {
                new FallingLeaf( aCanvas, leafPic,
                                 leafLocGen.nextValue(),   // x coordinate
                                 leafSpeedGen.nextValue(), // y speed
                                 aScreenHeight);
            } else {
                new FallingSleet(aCanvas,
                                 leafLocGen.nextValue(),   
                                 leafSpeedGen.nextValue() * 2, 
                                 aScreenHeight);
            }
            pause( 900);
            
        }
    }
    
}