var tile_size                      =  50;
var tile_z_offset                  =   0;
var editControlMouseWheelSpeed     =   0.8;  //Empfindlichkeit/Speed für Mausraddrehung
var editControlScrollSpeedRMB      =  50;    //Speed für rechtsklick scroll
var editControlScrollSpeedBorder   =  25;    //Speed für randscroll
var editControlScrollMarginPercent =   0.15; // %
var check_mouseclick               =   0;

void clamp_all(ENTITY* obj)
{
	tile_position.x = integer(tile_position.x);
	tile_position.y = integer(tile_position.y);
	tile_position.z = integer(tile_position.z);
	tile_position.x = clamp(tile_position.x, -200,200);
	tile_position.y = clamp(tile_position.y, -200,200);
	tile_position.z = clamp(tile_position.z,    0,200);
	
	obj.x = tile_position.x * tile_size;
	obj.y = tile_position.y * tile_size;
	obj.z = tile_position.z * tile_size;
}

void draw_cursor(ENTITY* obj)
{
	// some mouse buttons are pressed
	if (mouse_right || mouse_left)
	{
		// right button is pressed
		if (mouse_right)
		{
			// adjust editor view for direct scrolling
			mouse_mode = 4;
			camera->x -= mouse_force.x * editControlScrollSpeedRMB * time_step;
			camera->y -= mouse_force.y * editControlScrollSpeedRMB * time_step;					
		}
	}
	else
	{
		// do 3d cursor placement with the mouse
		// CB: the following code calculates the tile_position for the mouse cursor
		// get 3d points and direction of line, which pierces the screen at mouse position in camera
		VECTOR v1, v2, dir;
		{
			vec_set(&v1, vector(mouse_pos.x, mouse_pos.y, 0));
			vec_set(&v2, vector(mouse_pos.x, mouse_pos.y, 99999));
			
			vec_for_screen(&v1, camera);
			vec_for_screen(&v2, camera);
			
			vec_diff(&dir, &v2, &v1);
		}
		
		var d = vec_dot(vector(0,1,0), &dir);			
		
		if (abs(d) != 0) // not parallel to plane
		{
			// get intersection point with plane
			
			VECTOR dirPlaneFrom;
			vec_diff(&dirPlaneFrom, &v1, obj.x);					
			
			var n = vec_dot(vector(0,1,0), &dirPlaneFrom);
			
			VECTOR ip;
			vec_set(&ip, &dir);
			vec_scale(&ip, -n / d);
			vec_add(&ip, &v1);
			
			// transform into tile space
			
			tile_position.x = integer((ip.x + tile_size/2) / tile_size);
			tile_position.y = integer((ip.y + tile_size/2) / tile_size);
			tile_position.z = obj->z / tile_size;					
		}
		
		// CB: the following code changes the tile_position.z (height) with the mouse wheel!
		tile_position.z += sign((int)(mickey.z * editControlMouseWheelSpeed * time_step));
		
		check_mouseclick = 0;
	}
	clamp_all(obj);
}