jump simple game

jumpingavatar

function Avatar(scene){

    var JUMP_FORCE = 14;
    var sprite = new Sprite(scene, "./img/image.png", 150, 150);
    var jumping = false;

    sprite.init = function(){
       this.setSpeed(0);
    };

    sprite.checkGravity = function(){

        //the math looks a little funky but that's only
        //because the x y of the sprite is on the center of the sprite
        //so you have to do a little math to insure that the avater does
        //fall off the screen
        if(this.y > 500){
            this.setPosition(this.x, 500 );

            //reset jumping so it can only jump when on the ground
            jumping = false;
            this.dy = 0;   //must clear the dy for some reason
        }
        else if(this.y < 500){
            this.addVector(180,.8);
        }
    };

    sprite.checkKeys = function(){
        if(keysDown[K_UP] && jumping == false){
            jumping = true;
            this.addVector(0, JUMP_FORCE);
        }
    };

    return sprite;
}