How To Make a Tower Defense Game

[rwenderlich]

This is the official thread to discuss the following blog post: How To Make a Tower Defense Game

[rrdz473]

Great tutorial. Will certainly give it a try.

[Psevertson]

Great tutorial! I have been waiting for this one!
Another great tutorial for this topic is at: http://www.iphonegametutorials.com/2011 ... he-iphone/
You can combine ideas from both of them!

[mountainmarc1972]

In the starter projects Appdelegate you forgot to enable retina display by removing the // at line 73
if( ! [director enableRetinaDisplay:YES] )
CCLOG(@"Retina Display Not supported");

Thanks for the great tutorial !

[JohnL]

Superb tutorial as always!!

One minor thing, at the end of the tutorial where it says open Enemy.M and add the lines #import "SimpleAudioEngine.h"
This is not needed as the line is already in there from earlier when you created the Enemy class.

@mountainmarc1972
For me, removing the // at line 73, then running it on an iphone 4 makes things go funny. The waypoints and tower placements are ok, but the background picture is smaller than the screen (due to retina) and the enemy heath bars are out of place...
It looks ok on the Simulator though.


Keep up the good work!

[Rabbitpuncher]

I keep getting the following error which seems to point to glColor4f in the draw method.

Implicit declaration of function 'glColor4f' is invalid in C99

I also get

OpenGL error 0x0502 in -[CCSprite draw] 532

in the console when I run it.

I'm running Cocos2d 2.0. Any ideas why I get this?

[Pabloruiz55]

@Rabbitpuncher: Oh, this is because that funcion to draw the life bars deal with Opengl 1.x calls, that is why it doesn;t work with Cocos2d 2.x (Which uses OpenglES 2.0). I am no OpenGl expert so I wouldn't know how to translate them to 2.0, can anyone help?

[Rabbitpuncher]

Pablo...I'll research that a bit and see. Thanks...I love the tutorial!

[doninox]

TowerPosition.plist have 12 Items but in loadTowerPositions method
towersBases = [[NSMutaleArray alloc] initWithCapacity:10];
why is 10 than 11 ?

[tomneo2004]

If you are using Cocos2d 2.x use "ccDrawSolidPoly" method to draw health bar.
In Enemy.m "draw" method replace code to

Code: Select all


    CGPoint healthBarBack[] = {ccp(mySprite.position.x -10,mySprite.position.y+16),ccp(mySprite.position.x+10,mySprite.position.y+16),ccp(mySprite.position.x+10,mySprite.position.y+14),ccp(mySprite.position.x-10,mySprite.position.y+14)};
 
    ccDrawSolidPoly(healthBarBack, 4, ccc4f(255, 0, 0, 255));
   

    CGPoint healthBar[] = {ccp(mySprite.position.x + HEALTH_BAR_ORIGIN,mySprite.position.y+16),ccp(mySprite.position.x+HEALTH_BAR_ORIGIN+(float)(currentHp * HEALTH_BAR_WIDTH) / maxHp,mySprite.position.y+16),ccp(mySprite.position.x+HEALTH_BAR_ORIGIN+(float)(currentHp * HEALTH_BAR_WIDTH) / maxHp,mySprite.position.y+14),ccp(mySprite.position.x+HEALTH_BAR_ORIGIN,mySprite.position.y+14)};

    ccDrawSolidPoly(healthBar, 4, ccc4f(0, 255, 0, 255));


Use ccDrawSolidPoly instead of ccFillPoly.
ccFillPoly will cause problem in coco2d 2.x.