An actionscript exercise. Trying to get a movie clip to go to the closest dynamically created target. Click the button to make more targets. Dragable targets. Move the targets around to see the ball’s target change.
Example
actionscript
Here’s the actioscript for the little ball:
[cc lang=”actionscript” tab_size=”2″ lines=”40″]
onClipEvent (load) {
//random placement
_x = Math.random()* 450;
_y = Math.random()* 450;
//speed is speed, higher number is slower movement
speed = (Math.random()*5)+7;
//x and y distance from target
xdist = 0;
ydist = 0;
}
onClipEvent (enterFrame) {
//determine which target is closer a^2+b^2=c^2
//use a for loop to cycle through all targets,
//and assign the closest to be THE target
for (j=0; j <= _root.i; j++) {
//for the first automatically assign it as the closest
if (j == 0) {
xdist = _root.target0._x – _x;
ydist = _root.target0._y – _y;
}
//find the distance to next target
else {
//temporary distance variables
xdistT = _root[“target”+j]._x – _x;
ydistT = _root[“target”+j]._y – _y;
//if it is closer assign it to the closest, if not do nothing
if(Math.sqrt((xdist*xdist) + (ydist*ydist)) > Math.sqrt((xdistT*xdistT) + (ydistT*ydistT))) {
xdist = xdistT;
ydist = ydistT;
}
}
}
//move toward the selected target
_x += xdist/speed;
_y += ydist/speed;
//if target reached go to another random place
//if xdist is less than 2 and ydist is less than 2 and xdist is greater than 2 and ydist is greater than 2
if(xdist < 2 && ydist < 2 && xdist > -2 && ydist > -2) {
_x = Math.random() * 450;
_y = Math.random() * 450;
}
}
[/cc]
Source Flash File
download multipleTargets.fla