Forums → Programming Forum → TUTORIAL: Your Second Forum game (Learn the not so basic)

Inspired by DaddydaNinja's Tutorial.

This is a simple top-to-bottom stealth game in which you will avoid nasty guards

Make a movieclip, design it as a ball.
Make another, Design it as little boxes, something like a map.

Assign the ball this movieclip

onClipEvent (load) {
power = 3;
radius = 6;
}
onClipEvent (enterFrame) {
if (Key.isDown(Key.LEFT)) {
_x -= power;
}
if (Key.isDown(Key.RIGHT)) {
_x += power;
}
if (Key.isDown(Key.UP)) {
_y -= power;
}
if (Key.isDown(Key.DOWN)) {
_y += power;
}
while (_root.wall.hitTest(_x, _y+radius, true)) {
_y--;
}
while (_root.wall.hitTest(_x, _y-radius, true)) {
_y++;
}
while (_root.wall.hitTest(_x-radius, _y, true)) {
_x++;
}
while (_root.wall.hitTest(_x+radius, _y, true)) {
_x--;
}
}

If you know actionscript 2.0, then you will probably know what I instanced the little boxes.

Make another movieclip, instance as COP
Make another one again, instance as line

Assign the cop this:
onClipEvent (enterFrame) {
dist_x = _root.hero._x-_x;
dist_y = _root.hero._y-_y;
dist = Math.sqrt(dist_x*dist_x+dist_y*dist_y);
angle = Math.atan(dist_y/dist_x)/(Math.PI/180);
if (dist_x<0) {
angle += 180;
}
if (dist_x>=0 && dist_y<0) {
angle += 360;
}
wall_collision = 0;
for (x=1; x<=dist; x++) {
point_x = _x+x*Math.cos(angle*Math.PI/180);
point_y = _y+x*Math.sin(angle*Math.PI/180);
if (_root.wall.hitTest(point_x, point_y, true)) {
wall_collision = 100;
break;
}
}
_root.line._x = _x;
_root.line._y = _y;
_root.line._rotation = angle;
_root.line._alpha = 100-wall_collision;
}

I didn't use hit.test because you might code other stuff like a mirror or something.

Now try it.

Of course you would need more things to make it exciting. This is just a tutorial