Game Development Reference
In-Depth Information
the
GameScene
. Then if the touch
tapCount
is
0
, that is, the user is dragging
the code to move, the player is executed. In this code the
tankStat-
sForLocal
is updated on the basis of the position of the touch on screen. The
destination is set as the touch location, the direction is calculated by using vector
mathematics using the touch point and the current position of tank. To keep the
direction angle of the tank between 0 to 359 degrees, extra checks should be put
in place once the direction is calculated. After all this, to update the actual posi-
tion and rotation of the tank, a method called
updateLocalTank
, which we
will be discussing soon, will be implemented.
4. Implement the two other touch methods as well,
touchMoved
and
touchEn-
ded
, in
GameScene
.
5. In
touchesMoved
, if the game state is
kGameStatePlaying
then execute
the same code as in
touchesBegan
method, explained in the preceding point.
- (void)touchesMoved:(NSSet *)touches
withEvent:(UIEvent *)event
{
if (self.gameState == kGameStatePlaying)
{
if([touches count] == 1)
{
UITouch *thumb = [[event allTouches]
anyObject];
CGPoint thumbPoint = [thumb
locationInNode:self];
tankStatsForLocal.tankDestination =
thumbPoint;
tankStatsForLocal.tankDirection = atan2(
thumbPoint.y - tankStatsForLocal.tankPosition.y,
thumbPoint.x -
tankStatsForLocal.tankPosition.x ) - (M_PI/2.0);
// keep us 0-359
if(tankStatsForLocal.tankDirection < 0)
tankStatsForLocal.tankDirection +=
(2.0*M_PI);
else if(tankStatsForLocal.tankDirection >
