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Hello, I am building an Oceanic game and need to utilize the water surface. I am swimming fish through the sea however at angle '0' I want to fish to be pointing up and not left. I do this by creating the angle 90 degrees: this.xSpeed = Math.cos((this.fishBody.angle+90)/180*Math.PI) * -this.pSpeed; this.ySpeed = Math.sin((this.fishBody.angle+90)/180*Math.PI) * - this.pSpeed; However, I run into problems down the road with AI Fish.prototype.avoid = function(fishBodx, FishBodY, xsp,ysp){ var targetAngle = this.game.math.angleBetween( xsp, ysp, fishBodx, FishBodY ); if (this.fishBody.rotation !== targetAngle) { var delta = (targetAngle) - (this.fishBody.rotation); this.TURN_RATE = 3; // Keep it in range from -180 to 180 to make the most efficient turns. if (delta > Math.PI) delta -= Math.PI * 2; if (delta < -Math.PI) delta += Math.PI * 2; if (delta > 0) { // Turn clockwise this.fishBody.angle += this.TURN_RATE; } else { // Turn counter-clockwise this.fishBody.angle -= this.TURN_RATE; } // Just set angle to target angle if they are close if (Math.abs(delta) < this.game.math.degToRad(this.TURN_RATE)) { this.fishBody.rotation = targetAngle; } } } What is a good solution to this?