/** Melissa Hao 6.837 Project 1 9/98 * This is my SpriteTest class. This is the class to run when viewing my * my project 1. In this applet, I simulate flying through a field of * flowers. At first, you see the flowers off in the horizon; and then * they come closer to you, increasing in size during the process. * Each flower is displayed as an animation sequence that I achieved through * my AnimationSprite class. This class is based on the notion of Sprites * and states. Note - my class differs from the outline given in lecture... * I created my class tailored to my own needs. * Here is how my applet meets the five requirements: * * - I display two kinds of images, a short-stemmed flower and a long- * stemmed one. * - the short-stemmed flowers obviously move around on the "field" * (although it's supposed to look like they're stationary and you, as * you, as the observer, is moving) * - my sprites obviously are properly clipped (see Sprite.Draw()) * - my sprites obviously implement transparent pixels (see Sprite.Draw()) * - you can click anywhere on the sprite and my applets prints out * where you clicked, and also whether the pixel was transparent or not. * (This is where the long-stemmed flower comes in handy... you can use * that to test this procedure since it's stationary.) * Enjoy! */ import java.applet.*; import java.awt.*; import java.awt.event.*; import java.lang.*; import java.util.*; import java.math.*; import AnimatedSprite; public class SpriteTest extends Applet implements MouseListener, Runnable { static final int NUM_SPRITES = 50; int HIGHEST_ABOVE_GROUND = 10; int ground = 216; int SLEEP_TIME = 100; Image output; Raster bg, temp; Thread animate; Sprite longstem; AnimatedSprite s; int current_states[] = new int[ NUM_SPRITES]; Point points[] = new Point[ NUM_SPRITES]; boolean BEHIND_HORIZON[] = new boolean[ NUM_SPRITES]; int sprite_visible_height[] = new int[ NUM_SPRITES]; int num_states; int center; int bg_w, bg_h; int s_w, s_h[] = {34, 51, 84, 84, 103, 199}; int lastX, lastY; Random rand = new Random(); public void init() { Image[] images = { getImage( getDocumentBase(), "shortstem0.gif"), getImage( getDocumentBase(), "shortstem1.gif"), getImage( getDocumentBase(), "shortstem2.gif"), getImage( getDocumentBase(), "shortstem3.gif"), getImage( getDocumentBase(), "shortstem4.gif"), getImage( getDocumentBase(), "shortstem5.gif"), }; num_states = images.length; longstem = new Sprite(getImage( getDocumentBase(), "longstem.gif")); s = new AnimatedSprite( images); showStatus( "Using " + getParameter("image")); bg_w = getSize().width; bg_h = getSize().height; s_w = s.getWidth(); // s_h = s.getHeight(); center = bg_w/2 - s_w/2; //System.out.println("s_w = " + s_w + "; s_h = " + s_h + "; bg_w = " + bg_w + "; bg_h = " + bg_h); for (int i = 0; i < points.length; i++) { points[i] = new Point(); reset( i); //System.out.println("random() = " + random() + "; new point is " + points[i]); } bg = new Raster( getImage( getDocumentBase(), getParameter("bg"))); this.addMouseListener( this); render(); //for (int i=0; i<6; i++) s.Draw(bg,i*50,200,s.sprites[i].getHeight(),i); } public void start() { animate = new Thread( this); animate.start(); } public void stop() { animate = null; } public void run() { while (true) { try { animate.sleep( SLEEP_TIME); } catch (InterruptedException e) { } render(); } } public void render() { temp = new Raster( bg.toImage()); //s.Draw(temp,-100,213); //s.Draw(temp,400,213); for (int i = 0; i < points.length; i++) { int x = points[i].x, y = points[i].y; if (BEHIND_HORIZON[i]) s.Draw( temp, x, y, sprite_visible_height[i], current_states[i]); else s.Draw( temp, x, y, current_states[i]); //System.out.println("IN RENDER: current state is " + current_states[i]); //System.out.print("(" + x + ", " + y + ") "); //getGraphics().drawLine( 0, y, bg_w, y); points[i].x += translateX( x, i); points[i].y += translateY( y, i); sprite_visible_height[i] = update_visible_height( sprite_visible_height[i], i); if (points[i].x + s_w < 0 || points[i].x > bg_w || points[i].y - s_h[current_states[i]] > bg_h) reset( i); } //System.out.println(); output = temp.toImage(); longstem.Draw( temp, 0, 300); // longstem.Draw( temp, 100, 400); // longstem.Draw( temp, 300, 250); repaint(); } public void paint( Graphics g) { g.drawImage( output, 0, 0, this); } public void update( Graphics g) { paint(g); } public void mousePressed( MouseEvent e) { System.out.print( "mouse clicked at (" + e.getX() + ", " + e.getY() + ")"); System.out.println( "; transparent pixel? : " + transparent(e.getX(),e.getY())); lastX = e.getX(); lastY = e.getY(); // s.Draw( bg, lastX, lastY); // output = bg.toImage(); // update( getGraphics()); } public boolean transparent( int x, int y) { return (temp.getPixel(x,y) == bg.getPixel(x,y)); } public void mouseReleased(MouseEvent e) {} public void mouseClicked( MouseEvent e) {} public void mouseEntered( MouseEvent e) {} public void mouseExited( MouseEvent e) {} public void reset( int i) { // p[i].setLocation( Math.abs( rand.nextInt()) % (bg_w + s_w) - s_w, ground-5); points[i].setLocation( random(), ground); BEHIND_HORIZON[i] = true; sprite_visible_height[i] = 1; current_states[i] = 0; } public int translateX( int x, int i) { if (BEHIND_HORIZON[i]) return (x < center) ? -1 : 1; else return new Float(Math.abs( x-center) * .001 * (x-center)).intValue(); } public int translateY( int y, int i) { if (y == ground - HIGHEST_ABOVE_GROUND) { BEHIND_HORIZON[i] = false; //System.out.println("BEHIND_HORIZON set to false"); return -1; } else if (BEHIND_HORIZON[i]) return -1; else { if (current_states[i] < (num_states-1)) { current_states[i] = current_states[i] + 1; //System.out.println("current state of sprite " + i + " is " + current_states[i]); } return 25; } } public int update_visible_height( int current, int i) { if (BEHIND_HORIZON[i]) return (ground - points[i].y + 2); else return (current + 15); } public int random() { int temp = -s_w - 1; while (temp < -s_w || temp > bg_w) temp = (int) Math.round(300.0*rand.nextGaussian() + (double) (bg_w + s_w)/2); return temp; } }