// 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: 2024/6/26 07:44,
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