Multiple instances of a method? - objective-c

Question

The following code renders a zombie with interchangeable coordinates. The only issue is that I have to duplicate the code and create new coordinate variables myself for each zombie. Is there any way I can create copies of the variables so I only have to have one method for multiple zombies verses three methods and three separate variables for three zombies?
int zombieyCord;
int zombiexCord;
-(void)renderZombie
{
NSBezierPath * path = [NSBezierPath bezierPath];
[path setLineWidth:4];
NSPoint center = {zombieyCord,zombiexCord};
[path moveToPoint: center];
[path appendBezierPathWithArcWithCenter:center
radius:5
startAngle:0
endAngle:360];
[[NSColor greenColor] set];
[path fill];
[[NSColor greenColor] set];
[path stroke];
}
Edit:
The spawning is great and works perfectly, but I want the zombies to move properly. Before, the code was that the method was called upon the player moving. This no longer works because I have to call an integer in the method.
+(void)entityZombie:(int)zombiexCord andY:(int)zombieyCord
{
/* Handle Zombie Movement*/
if (xcord != zombiexCord || ycord != zombieyCord)
{
if (xcord > zombiexCord){zombiexCord=zombiexCord+1;}
if (xcord < zombiexCord){zombiexCord=zombiexCord-1;}
if (ycord < zombieyCord){zombieyCord=zombieyCord-1;}
if (ycord > zombieyCord){zombieyCord=zombieyCord+1;}
/* Handle Zombie Render*/
NSBezierPath * path = [NSBezierPath bezierPath];
[path setLineWidth:4];
NSPoint center = {zombieyCord,zombiexCord};
[path moveToPoint: center];
[path appendBezierPathWithArcWithCenter:center
radius:5
startAngle:0
endAngle:360];
[[NSColor greenColor] set];
[path fill];
[[NSColor greenColor] set];
[path stroke];
}
}
Player movement handling just involves rendering the player then [Entity entityZombie];
But as said above, no longer works.

Answer 1

-(void)renderZombieWithX:(int)xCoord andY:(int)yCoord {
NSBezierPath * path = [NSBezierPath bezierPath];
[path setLineWidth:4];
NSPoint center = {xCoord,yCoord};
[path moveToPoint: center];
[path appendBezierPathWithArcWithCenter:center
radius:5
startAngle:0
endAngle:360];
[[NSColor greenColor] set];
[path fill];
[[NSColor greenColor] set];
[path stroke];
}
Call it like this:
[self renderZombieWithX:10 andY:20];
[self renderZombieWithX:13 andY:37];
//...
Further more there is a dedicated function for creating NSPoints:
NSPoint center = NSMakePoint(xCoord, yCoord);
which you might want to use in favor of:
NSPoint center = {xCoord,yCoord};
(see one of my answer's comments on why)
If performance is critical a cached approach like the following might bring performance gain:
static NSImage *sharedZombieStamp;
- (NSImage *)sharedZombie {
#synchronized(sharedZombieStamp) {
if (!sharedZombieStamp) {
CGFloat lineWidth = 4.0;
CGFloat radius = 5.0;
sharedZombieStamp = [[NSImage alloc] initWithSize:NSMakeSize((lineWidth + radius) * 2, (lineWidth + radius) * 2];
[zombieImage lockFocus];
NSBezierPath *path = [NSBezierPath bezierPath];
[path setLineWidth:4];
NSPoint center = NSMakePoint(lineWidth + radius, lineWidth + radius);
[path moveToPoint: center];
[path appendBezierPathWithArcWithCenter:center
radius:radius
startAngle:0
endAngle:360];
[[NSColor greenColor] set];
[path fill];
[[NSColor greenColor] set];
[path stroke];
[zombieImage unlockFocus];
}
}
return sharedZombieStamp;
}
-(void)renderZombieWithX:(int)xCoord andY:(int)yCoord {
NSImage *zombie = [self sharedZombie];
NSSize zombieSize = [zombie size];
[zombie drawAtPoint:NSMakePoint(xCoord - zombieSize.width / 2, yCoord - zombieSize.height / 2)
fromRect:NSMakeRect(0.0, 0.0, zombieSize.width, zombieSize.height)
operation:NSCompositeSourceOver
fraction:1.0];
}
This code is just out of my head though. Went thru no testing, whatsoever. Use with caution ;)