Steering Behaviors written for Angelscript?

Johm Whiskers · 2019-01-30T03:10:11

Hello All, I am new to Angelscript and I am wanting to create steering behaviors for enemy AI. I haven't found any Angelscript examples on the web for Seek, Flee, Follow, Arrive, Collision avoidance, etc so far. I have successfully written an A* routine, but that's about it. Does anyone know of any steering behaviors written in Angelscript ? Can you post a link? Since I wasn't able to find any steering behaviors written in Angelscript, I decided to try to convert a "Flee" behavior written in C. Unfortunately there is a command I can't seem to find in Angelscript that the C code uses. Specifically, the "Limit" command. I think it is equivalent to a "SCALAR" command? I am not sure. Anyone know? Thanks in advance for any help. This is the code for the "Flee" behavior below: class Vehicle { PVector location; PVector velocity; PVector acceleration; Additional variable for size float r; float maxforce; float maxspeed; Vehicle(float x, float y) { acceleration = new PVector(0,0); velocity = new PVector(0,0); location = new PVector(x,y); r = 3.0; Arbitrary values for maxspeed and force; try varying these! maxspeed = 4; maxforce = 0.1; } Our standard “Euler integration” motion model void update() { velocity.add(acceleration); velocity.limit(maxspeed); <<<------------ THIS LINE USES THE COMMAND "LIMIT" location.add(velocity); acceleration.mult(0); } Newton’s second law; we could divide by mass if we wanted. void applyForce(PVector force) { acceleration.add(force); } Our seek steering force algorithm void seek(PVector target) { PVector desired = PVector.sub(target,location); desired.normalize(); desired.mult(maxspeed); PVector steer = PVector.sub(desired,velocity); steer.limit(maxforce); applyForce(steer); } void display() { Vehicle is a triangle pointing in the direction of velocity; since it is drawn pointing up, we rotate it an additional 90 degrees. float theta = velocity.heading() + PI/2; fill(175); stroke(0); pushMatrix(); translate(location.x,location.y); rotate(theta); beginShape(); vertex(0, -r*2); vertex(-r, r*2); vertex(r, r*2); endShape(CLOSE); popMatrix(); }

AngelCode Affiliates Scripting Pathfinding 2D

Started by DrMeowEyes January 27, 2019 02:35 AM

10 comments, last by DekuTree64 5 years, 9 months ago

DekuTree64

1,170

January 30, 2019 03:10 AM

It's probably working correctly. If max velocity is 1.5 pixels per frame, and the objects are several hundred pixels apart, then it will indeed take several hundred frames to get there. And since the target will have moved several hundred pixels during that time, you should aim several hundred pixels ahead of its current position.

Looking at that seek function in your original post, it should be fine if the target position passed to it is far away from the current position. And the line velocity.limit(maxspeed) in the update function should prevent velocity from ever going too high.

Steering Behaviors written for Angelscript?

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Steering Behaviors written for Angelscript?

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