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Thread: Math help
 03042012, 11:50 AM #1Member
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Math help
I'm new to JAVA, porting a processing sketch over for improvement. I recently decided to change my enemy AI, and make the enemies veer away from the player if they get close. I figured I could accomplish this by moving the enemies targetX and targetY over, depending on their angle to the player. Since I'm not yet familiar with the more advanced trigonometry, I need help with this. Attached is an image visualizing my problem. I need an algorithm to change point A to pint B.
If this helps, here is the current AI code:
Java Code:// distance from mouse to player double distX = Main.myPlayer.getX()  x; double distY = Main.myPlayer.getY()  y; // get total distance as one number double distTotal = Math.sqrt(distX * distX + distY * distY) + 1; // add // 1 to fix / by 0 problem // calculate how much to move double moveDistanceX = turnRadius * distX / distTotal; double moveDistanceY = turnRadius * distY / distTotal; // increase current speed velocityX += moveDistanceX; velocityY += moveDistanceY; // get total move distance double totalMove = Math.sqrt(velocityX * velocityX + velocityY * velocityY); // apply easing velocityX = speed * velocityX / totalMove; velocityY = speed * velocityY / totalMove; // apply velocity x += velocityX; y += velocityY; // apple angle angle = Math.atan2(velocityX, velocityY);
 03042012, 12:02 PM #2
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Re: Math help
Where does the clear blue dotted line come from?
kind regards,
Joscenosillicaphobia: the fear for an empty beer glass
 03042012, 12:17 PM #3Member
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Re: Math help
Only the Player and Enemy actually appear on screen. Everything else is just for visualization.
Blue line: Current Enemy path
Purple Line: Desired Enemy Path
 03042012, 12:59 PM #4
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 03052012, 12:48 AM #5Member
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Re: Math help
The enemy attempts to chase the player, and its angle will always be the direction it is moving in. I just need a way to direct the Enemy to a point beside the player, instead of on it. The Main.myPlayer.getX/Y() in the first few lines would be replaced, but I don't know with what.
 03092012, 01:00 AM #6Member
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