Lets say the program I’m trying to write loads an image(a pattern with couple of colors). Then it’ll play a sounds if the user’s finger is inside image and will not do anything otherwise. Also it’ll change the sound (when finger is inside the image) depending on the color of the image at finger’s location.

I was successful in having an image loaded and accessing the finger location coordinates, playing sounds by wav files etc… Yet I couldn’t figure out following two issues,

1) How to detect whether the finger was in or out the image?
2) How to access the color value of a given pixel in a an image. (let say the loaded image is an bitmap to make things simple)

I tried to do this for couple of months but had no progress. I went through almost all apple tutorials and some of yours too…but still cldn’t resolve. I’d be very greateful to you if you cld guide me on this.

Thanks

Pubudu

But i just download your tutor 4 coding,
and using simulator-3.0|Debug to run it.

Only replace the one line at EAGLView.m
but it give me the same problem, the app. close itself with no error message.

//message = @”This is a longer message to see if this is going to work….”;

message = [NSString stringWithFormat:@"%i", random];

I’m not sure how you are defining your message ivar, but the way you are assigning it is incorrect. The getWidthForString method requires a parameter of type NSString. If you are defining the message ivar as an NSString, then just pointing it to a random will not work, you would need to use something like

message = [NSString stringWithFormat:@"%i", random];

I have use the exact code above with the correction in place and it works fine.

See if that helps.

Mike

thanks
keith

- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {

Int random_number1=random()%100;
message= random_number1;
messageX = 320; messageY=200;
messageWidth = [font1 getWidthForString:message];

}

Thanks for reply, sorry have not give the details.
There is no error message when build the project, i place this function into a Starttouch screen event.
When I run the similator the program run ok, but it close the app. automaticlly when I click the similator screen .
When i replace the code
message= [NSString stringWithFormat:@"%d", random_number1]; ->
message = @”99″;
the app. work good.
I believed i make something wrong about pass a value into a point, not passing a address??

thanks
keith

What are the errors you are getting. Without the error it is hard to identify the problem.

Mike

Your tutors is great.

when I try to use BitMap front to display a random number , it give me some error, can you tell what i should change my code?
thank you very much
keith Chan
int random_number;
random_number1 = 100;
message= [NSString stringWithFormat:@"%d", random_number1];
messageX = 320; messageY=200;
messageWidth = [font1 getWidthForString:message];

I am tied up getting the final edits for the book finished at the moment, but as soon as that is done I am going to look to get the tutorials updated to the latest SDK. I’ll also look at creating an abstract bitmap font class. If you want to have a go an see how you get on, I’d be happy to look at any problems you come across.

Mike

Also, would it be possible to have an abstract Bitmap font framework posted?