// MeCanvas clas // part of the set of documents known as Java no sugar. // Copyright (c) 1996,1997 Sunil Gupta, sunil@magnetic.demon.co.uk // placed into the public domain by the author // import java.awt.*; import java.net.*; import java.io.*; import Context; public class MeCanvas extends ThreadedCanvas { //******************************************************************* // globals //******************************************************************* static final int MAX_DURATION =5; static final int DOING_NOTHING = -1; static final int LOADING_IMAGES = 0; static final int IMAGES_OK = 2; static final int LOOK_LEFT =0; static final int LOOK_RIGHT =1; static final int TONGUE =2; static final int HIT =3; static final int AAGH =4; static final int SMUG1 =5; static final int SMUG2 =6; static final int N = 0; static final int NE = 1; static final int E = 2; static final int SE = 3; static final int S = 4; static final int SW = 5; static final int W = 6; static final int NW = 7; static final int STOP = 8; static final int IMAGE_WIDTH = 118; static final int IMAGE_HEIGHT = 186; static boolean images_loaded = false; static String status = ""; static int doing_what = DOING_NOTHING; static Image img_look_left, img_look_right, img_tongue; static Image img_hit, img_aagh, img_smug1, img_smug2; static Image img_ne_aagh, img_nw_aagh, img_sw_aagh, img_se_aagh; static Image img_eyebrowse_aagh, img_hair_aagh, img_specs_aagh, img_mouth_aagh; static Image normal_images[] = null; static int current_id = 1; //******************************************************************* // instance variables //******************************************************************* int which_image = LOOK_LEFT; int x,y, direction, duration, time_spent; int explode_x, explode_y; boolean exploding = false, imploding = false; int explode_counter = 0; //################################################################### // Paint stuff //################################################################### public void addNotify() { Thread image_loader; super.addNotify(); // -------load images asynchronously----------- if (doing_what == DOING_NOTHING) { image_loader = new Thread(this); image_loader.start(); } } //******************************************************************* public Dimension minimumSize() { return ( new Dimension(200,200)); } //******************************************************************* public boolean mouseDown( Event ev, int mouse_x, int mouse_y) { Rectangle rect; if (exploding) set_status ("Can't you see I'm breaking apart?"); else { rect = new Rectangle(x,y,IMAGE_WIDTH, IMAGE_HEIGHT); if ( rect.inside(mouse_x, mouse_y)) { set_status ("Hit"); exploding = true; imploding = false; explode_counter = 0; explode_x = x + IMAGE_WIDTH/2; explode_y = y + IMAGE_HEIGHT/2; } else set_status ("You missed"); } return true; } //################################################################### // THREADS //################################################################### public void onRun( Graphics g) { x = (int) (Math.random() * size().width); y = (int) (Math.random() * size().height); choose_direction(); } //******************************************************************* public void run() { if (doing_what == DOING_NOTHING) { doing_what = LOADING_IMAGES; try { load_images(); } catch (Exception e) {} } else super.run(); } //******************************************************************* public void onLoop( Graphics g) { Image img; int image_num, random; int font_width, font_height, font_x, font_y; FontMetrics metrics; if (doing_what != IMAGES_OK) { metrics = g.getFontMetrics(); font_width = metrics.stringWidth(status); font_height = metrics.getHeight(); random = (int) Math.round(Math.random() * 4.0); switch (random) { case 1: g.setColor(Color.red); break; case 2: g.setColor(Color.blue); break; case 3: g.setColor(Color.green); break; default: g.setColor(Color.black); } font_x = size().width - font_width; font_y = (size().height - font_height)/2; g.drawString(status, font_x, font_y); } else if (exploding || imploding) { onExplodeLoop(g); } else { //----------------choose the image------------- image_num = choose_image(direction); //------------draw it------------------------- img = normal_images[image_num]; g.drawImage( img,x,y,null); //---------get ready for next image----------- move_image(); time_spent ++; duration --; if (duration <= 0) choose_direction(); } //----------------sleep------------------------------- try { Thread.sleep(50); } catch (Exception e){} } //******************************************************************* public void onExplodeLoop( Graphics g) { int delta; //-------------------draw the peices in place------------------ if (explode_counter < 2) { g.drawImage( img_hit,x,y,null); } else if (explode_counter < 6) { g.drawImage( img_aagh,x,y,null); } else { delta = (explode_counter-5) * (explode_counter-5) * 2; g.drawImage(img_ne_aagh, explode_x-delta, explode_y+delta, null); g.drawImage(img_nw_aagh, explode_x+delta, explode_y+delta, null); g.drawImage(img_sw_aagh, explode_x-delta, explode_y+delta, null); g.drawImage(img_se_aagh, explode_x-delta, explode_y-delta, null); g.drawImage(img_eyebrowse_aagh, explode_x+delta, explode_y, null); g.drawImage(img_hair_aagh, explode_x, explode_y-delta, null); g.drawImage(img_specs_aagh, explode_x-delta, explode_y, null); g.drawImage(img_mouth_aagh, explode_x, explode_y+delta, null); } //-------------------get ready for next step------------------- if (exploding) { explode_counter ++; if (explode_counter >= 15) { exploding = false; imploding = true; x = (int) (Math.random() * size().width); y = (int) (Math.random() * size().height); explode_x = x; explode_y = y; } } else { explode_counter --; if (explode_counter <= 0) { imploding = false; choose_direction(); } } } //################################################################### // stuff //################################################################### void load_images() throws Exception { URL dir_url, img_url; MediaTracker tracker = new MediaTracker(this); System.out.println("Called load_images"); //------------load main pictures--------------- if (!images_loaded) { dir_url = new URL(Context.code_base, "pics/" ); img_url = new URL(dir_url, "looklef.gif"); img_look_left = getImage(img_url, tracker); img_url = new URL(dir_url, "lookrit.gif"); img_look_right = getImage(img_url, tracker); img_url = new URL(dir_url, "tongue.gif"); img_tongue = getImage(img_url, tracker); img_url = new URL(dir_url, "hit.gif"); img_hit = getImage(img_url, tracker); img_url = new URL(dir_url, "aagh.gif"); img_aagh = getImage(img_url, tracker); img_url = new URL(dir_url, "smug.gif"); img_smug1 = getImage(img_url, tracker); img_url = new URL(dir_url, "smug2.gif"); img_smug2 = getImage(img_url, tracker); //------------------populate array-------------------- normal_images = new Image[7]; normal_images[0] = img_look_left; normal_images[1] = img_look_right; normal_images[2] = img_tongue; normal_images[3] = img_hit; normal_images[4] = img_aagh; normal_images[5] = img_smug1; normal_images[6] = img_smug2; //------------load aargh pictures--------------- dir_url = new URL(Context.code_base,"aaghpart/" ); img_url = new URL(dir_url, "aagh_ne.gif"); img_ne_aagh = getImage(img_url, tracker); img_url = new URL(dir_url, "aagh_nw.gif"); img_nw_aagh = getImage(img_url, tracker); img_url = new URL(dir_url, "aagh_sw.gif"); img_sw_aagh = getImage(img_url, tracker); img_url = new URL(dir_url, "aagh_se.gif"); img_se_aagh = getImage(img_url, tracker); img_url = new URL(dir_url, "eyebrows.gif"); img_eyebrowse_aagh = getImage(img_url, tracker); img_url = new URL(dir_url, "hair.gif"); img_hair_aagh = getImage(img_url, tracker); img_url = new URL(dir_url, "specs.gif"); img_specs_aagh = getImage(img_url, tracker); img_url = new URL(dir_url, "mouth.gif"); img_mouth_aagh = getImage(img_url, tracker); images_loaded = true; doing_what = IMAGES_OK; set_status("Images were fine"); } } //******************************************************************* synchronized int get_id() { int old_id; old_id = current_id; current_id ++; return old_id; } //******************************************************************* synchronized Image getImage( URL url, MediaTracker tracker) throws Exception { int ID; Image image; Thread.yield(); // ----------------------------------------------- // tell the toolkit to load an image, no point checking for // null as the images are loaded asynchronously image = getToolkit().getImage(url); // ----------------------------------------------- // you have to use a media tracker to find out whether // the image was loaded ID = get_id(); tracker.addImage(image, ID); tracker.waitForID(ID); if ( tracker.isErrorID(ID) ) { set_status("Unable to or couldnt find image:\n '" + url +"'"); throw new IOException("Unable to or couldnt find image: '" + url +"'") ; } // ----------------------------------------------- set_status( url); return image; } //******************************************************************* int choose_image( int the_direction) { int image_num, mutate_image; double normality_level; //------------------current image-------------------- switch (the_direction) { case N: case S: image_num = SMUG1; break; case NE: case SE: case E: image_num = LOOK_LEFT; break; case NW: case W: case SW: image_num = LOOK_RIGHT; break; default: image_num = SMUG2; break; } //----------------random one ------------- normality_level = Math.random() * 5.0; if (normality_level <= 1.0) { mutate_image = (int) Math.round(Math.random() * 2.0); switch (mutate_image) { case 0: image_num = LOOK_LEFT; break; case 1: image_num = LOOK_RIGHT; break; case 2: image_num = TONGUE; break; } } //----------------and the jury says-------- return image_num; } //******************************************************************* void move_image() { int delta; delta = 4 * time_spent; switch (direction) { case N: y+=delta; break; case NE: x+=delta; y+=delta; break; case E: x+=delta; break; case SE: x+=delta; y-=delta; break; case S: y-=delta; break; case SW: x-=delta; y-=delta; break; case W: x-=delta; break; case NW: x-=delta; y+=delta; break; } if ( (x <= 0) || ( (x+IMAGE_WIDTH) >= size().width)) x = (int) Math.round(Math.random() * (size().width - IMAGE_WIDTH) ); if ( (y <= 0) || ( (y+IMAGE_HEIGHT) >= size().height)) y = (int) Math.round(Math.random() * (size().height - IMAGE_HEIGHT)); } //******************************************************************* void choose_direction() { direction = (int) Math.round((Math.random() * STOP)); duration = (int) (Math.random() * MAX_DURATION); time_spent = 1; } //******************************************************************* void set_status(String message) { status = message; System.out.println(message); } }
file: /Techref/language/java/nosugar/graphics/me/code/MeCanvas.java, 12KB, , updated: 1997/8/25 13:29, local time: 2024/8/26 09:21,
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