phys.js

function phys_player(){
	
	// If player dies
	if(player.health.state < 1){
		player_dead();
	}
	
	// If an axis is coliding
	var xHit, yHit;
	
	/* BULLET COLLISION */
	for(var i = 0; i < projectile.length; i++){

		// Check if it's their own projectile
		if(projectile[i].id === player.id){
			continue; // The the next projectile
		}
		
		// Sum boools
		xHit = false;
		yHit = false;
		
		// Collision check
		if(player.x <= projectile[i].x){
			if(player.x + player.width >= projectile[i].x){
				xHit = true;
			}
		}
		if(player.y <= projectile[i].y){
			if(player.y + player.height >= projectile[i].y){
				yHit = true;
			}
		}
		
		// Check if both axis hit
		if(xHit && yHit){
			
			// Deal dmg
			player.health.state -= projectile[i].damage;
			
			// Remove the bullet
			projectile.splice(i, 1);
			i--; // Go back an index since this index got spliced
			
		}
	}
	
	
	/* MOVEMENT */
	var incX = true, incY = true;
	
	// Calc the player velocity based on input
	if(client.key.left && player.velocity.x > -player.velocity.max)       player.velocity.x -= player.velocity.inc;
	if(client.key.right && player.velocity.x < player.velocity.max)  player.velocity.x += player.velocity.inc;
	if(client.key.up && player.velocity.y > -player.velocity.max)         player.velocity.y -= player.velocity.inc;
	if(client.key.down && player.velocity.y < player.velocity.max)   player.velocity.y += player.velocity.inc;
	
	// Calculate player velocity based on friction
	if(player.velocity.x >= 0)  player.velocity.x -= player.velocity.friction;
	else                        player.velocity.x += player.velocity.friction;
	if(player.velocity.y >= 0)  player.velocity.y -= player.velocity.friction;
	else                        player.velocity.y += player.velocity.friction;
	
	// Make the player stand still if velocity too low
	if(Math.abs(player.velocity.x) < player.velocity.min) incX = false;
	if(Math.abs(player.velocity.y) < player.velocity.min) incY = false;
	
	
	// Apply the player velocity to the player position
	if(incX) player.x += player.velocity.x;
	if(incY) player.y += player.velocity.y;
	
	
	/*-- - Set the offset for the screen! - --*/
	client.offset.x = player.x - (client.width / 2) + (player.width / 2);
	client.offset.y = player.y - (client.height / 2) + (player.height / 2);
	

}


function phys_enemy(){
	
	// every enemy
	for(var i = 0; i < enemy.length; i++){
		
	    // If enemy dies
	    if(enemy[i].health.state < 1){
			
			// Got a kill
			client.stat.currentKills++;
			
	    	enemy.splice(i, 1);
			continue;
	    }
	    
	    
	    // If an axis is coliding
	    var xHit, yHit;
	    
	    /* BULLET COLLISION */
	    for(var b = 0; b < projectile.length; b++){
        
	    	// Check if it's their own projectile
	    	if(projectile[b].id === enemy[i].id){
	    		continue; // The the next projectile
	    	}
	    	
	    	// Sum boools
	    	xHit = false;
	    	yHit = false;
	    	
	    	// Collision check
	    	if(enemy[i].x <= projectile[b].x){
	    		if(enemy[i].x + enemy[i].width >= projectile[b].x){
	    			xHit = true;
	    		}
	    	}
	    	if(enemy[i].y <= projectile[b].y){
	    		if(enemy[i].y + enemy[i].height >= projectile[b].y){
	    			yHit = true;
	    		}
	    	}
	    	
	    	// Check if both axis hit
	    	if(xHit && yHit){
	    		
	    		// Deal dmg
	    		enemy[i].health.state -= projectile[b].damage;
	    		
	    		// Remove the bullet
	    		projectile.splice(b, 1);
				continue;
	    	}
	    }
		
		
		/* Shoot the projectile */
	    
		// calculate the distance between the player and itself
	    var d = dist(enemy[i].x, enemy[i].y, player.x, player.y);
	    
	    // Try to shoot a shoot towards the player
	    if(d <= enemy[i].instruction.attackDist){
	    	create_enemy_projectile(i);
	    }
	    
		
		
		/* Movement */
		const MIN_DIST = 2;
		var dx = enemy[i].x - player.x;
		var dy = enemy[i].y - player.y;
		var distance = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));

		if(distance > MIN_DIST){
			// Accelerate the enemy towards player
			if(Math.abs(enemy[i].velocity.x) < enemy[i].velocity.max){
				// Accelerate
				if(dx < 0){
					enemy[i].velocity.x += enemy[i].velocity.inc;
				}
				else{
					enemy[i].velocity.x -= enemy[i].velocity.inc;
				}
			}
			if(Math.abs(enemy[i].velocity.y) < enemy[i].velocity.max){
				// Accelerate
				if(dy < 0){
					enemy[i].velocity.y += enemy[i].velocity.inc;
				}
				else{
					enemy[i].velocity.y -= enemy[i].velocity.inc;
				}
			}
		}
		else{
			// Accelerate the enemy slowly away from the player
			
			
			
		}
	
		
		
	    // Apply the friction
	    if(enemy[i].velocity.x >= 0)  enemy[i].velocity.x -= enemy[i].velocity.friction;
	    else                          enemy[i].velocity.x += enemy[i].velocity.friction;
	    if(enemy[i].velocity.y >= 0)  enemy[i].velocity.y -= enemy[i].velocity.friction;
	    else                          enemy[i].velocity.y += enemy[i].velocity.friction;
	    
	    // Make the enemy stand still if velocity too low
		var incX = true, incY = true;
	    if(Math.abs(enemy[i].velocity.x) < enemy[i].velocity.min) incX = false;
	    if(Math.abs(enemy[i].velocity.y) < enemy[i].velocity.min) incY = false;
	    
	    // Apply the enemy velocity to the enemy position
	    if(incX) enemy[i].x += enemy[i].velocity.x;
	    if(incY) enemy[i].y += enemy[i].velocity.y;
		
		
		
		// Apply the acceleration to the movement
		enemy[i].x += enemy[i].velocity.x;
		enemy[i].y += enemy[i].velocity.y;
	    
	}	
}


function phys_projectile(){
	
	// Get the time
	var d = new Date();
    var t = d.getTime();
	
	// Remove indexes
	var removeIndex = []
	
	// Loop through all the projectiles
	for(var i = 0; i < projectile.length; i++){
		
		// Check if it should be removed now
		if(projectile[i].ending <= t){
			// It's past the removal time
			
			removeIndex.push(i); // Add the index to an array
			continue; // Next obj
		}
		
	}
	
	// Loop through the removeIndex and remove all the unwanted projectiles
	for(var i = 0; i < removeIndex.length; i++){
		
		// Remove the projectile
		projectile.splice(removeIndex[i] - i, 1);
		
	}
	
	
	
	/* Move the projectile acording to it's coordinate */
	for(var i = 0; i < projectile.length; i++){

		// Increment the bullet position
		projectile[i].x += projectile[i].xInc;
		projectile[i].y += projectile[i].yInc;
	
	}
	
}


function phys(){
	
	// The players physics
    phys_player();
	
	// Physics for the emeys (bot)
	phys_enemy();
	
	// Physics for the projectiles
	phys_projectile();
	
	// Check if it should create projectile
	if(client.mouse.down){ create_player_projectile() }
}