creating transperent button in cocos2d iphone - iphone

Question

I am developing a cocos2d game. In that game I hace a character, and according to the touch positions on the caracter different actions should be triggered,How can i Implement this in my cocos2d game.
Is there any method to implement transparent button in cocos2d.
Thanks in advance

Answer 1

When you create a CCMenuItemSprite (a button), you assign it a sprite to use for display.
You can then change the appearance of the button by changing the opacity property of the sprite, or by making it not visible at all.
CCSprite *buttonSpr = [CCSprite spriteWithSpriteFrameName:#"spr.png"];
CCMenuItem *button = [CCMenuItemSprite itemFromNormalSprite:buttonSpr selectedSprite:buttonSpr target:self selector:#selector(buttonTapped:)];
//opacity
buttonSpr.opacity = 50;
//invisible
buttonSpr.visible = false;

Answer 2

I'm not entirely sure that I understand the question and more information would be helpful, but I'll answer it the best I can.
Assuming you have a character class I would implement checkTouchesBegan and do something like this:
-(BOOL) checkTouchesBegan: (CGPoint*) location
{
//conver the touch coordinates to fit your system
int converty = location->y-160;
int convertx = location->x-240;
//determine where the touch is in relation to the center of the character
float ydif = (1.0)*(converty - character_y);
float xdif = (1.0)*(convertx - character_x);
//determine the angle of the touch
float degrees = atan2f(xdif, ydif) * 57;
//determine the distance between the character and the touch
float squared = xdif*xdif + ydif*ydif;
//if the touch is above the character and within a certain distance
if(degrees >= 45 && degrees < 135 && sqrt(squared) < 100)
{
doSomething;
return YES;
}
//if the touch is below the character and within a certain distance
else if(degrees < -45 && degrees >= -135 && sqrt(squared) < 100)
{
doSomething;
return YES;
}
//if the touch is to the right of the character and within a certain distance
else if(degrees >= -45 && degrees < 45 && sqrt(squared) < 100)
{
doSomething;
return YES;
}
//if the touch is to the left of the character and within a certain distance
else if(sqrt(squared) < 100)
{
doSomething;
return YES;
}
return NO;
}
Hope this helps some!