Drivable Car
Description: This car moves forwards, backwards, turns, and has angling wheels.
Author: John Bezanis
Added: January 28th 2007
Version: Flash 8
Total Views: 5940
Views in the Past 7 Days: 82
The car is drivable on the press of the direction keys. The car moves forward, backwards, turns, and has moving front wheels.
- //www.swfspot.com
- //movement speed of the car
- var speed=7;
- //Compute pi/180. The value is used twice for each frame, so storing it as a variable saves CPU
- var piOver180=Math.PI/180;
- onEnterFrame=function(){
- //If the left or right keys are down, rotate the wheels
- if(Key.isDown(Key.LEFT)){
- car.leftwheel._rotation=Math.min(24,Math.max(-24,car.leftwheel._rotation-5));
- car.rightwheel._rotation=Math.min(24,Math.max(-24,car.rightwheel._rotation-5));
- }
- if(Key.isDown(Key.RIGHT)){
- car.leftwheel._rotation=Math.min(24,Math.max(-24,car.leftwheel._rotation+4));
- car.rightwheel._rotation=Math.min(24,Math.max(-24,car.rightwheel._rotation+4));
- }
- //check if the up or down keys are pressed
- if(Key.isDown(Key.UP)||Key.isDown(Key.DOWN)){
- //if the up key is down, the car moves forward
- if(Key.isDown(Key.UP)){
- carDirection=1;
- //otherwise move the car backwards
- }else{carDirection=-1;}
- //default turning to false
- turning=0;
- //if the left or right keys are pressed, set turning to true and rotate the car
- if(Key.isDown(Key.LEFT)){
- turning=1;
- car._rotation-=5*carDirection;
- }
- else if(Key.isDown(Key.RIGHT)){
- turning=1;
- car._rotation+=5*carDirection;
- }
- //if the car isn't turning, reset the rotation of the tires
- if(!turning){
- car.leftwheel._rotation=0;
- car.rightwheel._rotation=0;
- }
- //move the car. The y coordinate plane is flipped in flash, so we use - instead of +
- car._x+=Math.sin(car._rotation*piOver180)*speed*carDirection;
- car._y-=Math.cos(car._rotation*piOver180)*(speed)*carDirection;
- }
- }
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Questions and Suggestions
Good tut, but you could add physics, like friction, drag, etc. This would cause the car to behave more realistically. It would coast, slide, and other good stuff.
June 2nd 2007 11:06AM - Egan
can utell how thr car was made
October 11th 2007 22:10PM - altaf
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