Getting part of an image to blit to the upper right corner.

Author

100

July 22, 2004 10:42 PM

So I've been trying to properly blit the rest of my image to the upper right hand corner (as you can see from the code below that I've put it in the upper left, lower left, and lower right corners already). I just can't seem to get it to blit to the upper right corner, I've been trying for quite some time. Any help would be much appreciated.

#include <allegro.h>

int main(int argc, char *argv[])
{
	allegro_init();
	install_keyboard();
	set_color_depth(32);
	set_gfx_mode(GFX_AUTODETECT, 800, 600, 0, 0);
	
	BITMAP *my_pic;
	my_pic = load_bitmap("tuxx.bmp", NULL);
	
	acquire_screen();
	blit(my_pic, screen, 0, 0, 0, 0, 50, 50); // draw from 0,0 to 50,50 on postion 0,0
	blit(my_pic, screen, 50, 50, 722, 498, 128, 152); // draw from 50,50 to 128, 152 on position 722,498
	blit(my_pic, screen, 0, 50, 0, 498, 50, 152); // draws on the bottum left
	blit(my_pic, screen, 128, 0, 722, 0, 78, 102); // want to draw on the upper right
	readkey();
	
	destroy_bitmap(my_pic);
	return(0);
}
END_OF_MAIN();

Thanks in advance. [smile]

_________________Politics is the ability to foretell what is going to happen tomorrow, next week, next month and next year. And to have the ability afterwards to explain why it didn't happen. -- Winston ChurchillGDNet-0.2 - rate users the easy way with this nifty Firefox extension. Updated with new features.

Alpha_ProgDes

6,963

July 22, 2004 11:06 PM

how wide is the screen?
maybe you are blitting off screen?

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23yrold3yrold

941

July 22, 2004 11:29 PM

More important would be how big is tuxx.bmp?

Jesus saves ... the rest of you take 2d4 fire damage.

Drevay

Author

100

July 22, 2004 11:39 PM

Quote: Original post by 23yrold3yrold
More important would be how big is tuxx.bmp?

128x152

Of course the resolution is set to 800x600.

_________________Politics is the ability to foretell what is going to happen tomorrow, next week, next month and next year. And to have the ability afterwards to explain why it didn't happen. -- Winston ChurchillGDNet-0.2 - rate users the easy way with this nifty Firefox extension. Updated with new features.

23yrold3yrold

941

July 22, 2004 11:51 PM

Quote: Original post by Drevay
Quote: Original post by 23yrold3yrold
More important would be how big is tuxx.bmp?

128x152

Of course the resolution is set to 800x600.

I knew it. :) Drevay, why is the third parameter to blit() 128? That's the upper-left coordinate of where you're blitting from the source bitmap. Which is its right edge. Not good. ;)

Change it to 64 (to start from the middle) or something.

Jesus saves ... the rest of you take 2d4 fire damage.

Drevay

Author

100

July 23, 2004 12:02 AM

Ugh, I've tried so many combinations it's not funny. 0, 152 for the 3rd and 4th params should work by your logic, 23, but I've also tried various other routes.

Argh.

EDIT - I'm not trying to split it into 4 equal peices, just to let you know.

_________________Politics is the ability to foretell what is going to happen tomorrow, next week, next month and next year. And to have the ability afterwards to explain why it didn't happen. -- Winston ChurchillGDNet-0.2 - rate users the easy way with this nifty Firefox extension. Updated with new features.

Drevay

Author

100

July 23, 2004 12:09 AM

Welp, looks like a figured it out. [smile]

I just had to take the third blit and semi-reverse it.

Observe:

	blit(my_pic, screen, 0, 50, 0, 498, 50, 152); // draws on the bottum left	blit(my_pic, screen, 50, 0, 722, 0, 152, 50); // want to draw on the upper right

I feel great now that I've figured it out. [smile]

_________________Politics is the ability to foretell what is going to happen tomorrow, next week, next month and next year. And to have the ability afterwards to explain why it didn't happen. -- Winston ChurchillGDNet-0.2 - rate users the easy way with this nifty Firefox extension. Updated with new features.

Drevay

Author

100

July 23, 2004 12:22 AM

Well, I've made it split itself evenly (although it doesn't LOOK entirely even). Here's the source, and the end of this little test (unless somebody has some input):

#include <allegro.h>int main(int argc, char *argv[]){	allegro_init();	install_keyboard();	set_color_depth(32);	set_gfx_mode(GFX_AUTODETECT, 800, 600, 0, 0);		BITMAP *my_pic;	my_pic = load_bitmap("tuxx.bmp", NULL);		acquire_screen();	blit(my_pic, screen, 0, 0, 0, 0, 64, 76); // draw from 0,0 to 50,50 on postion 0,0	blit(my_pic, screen, 64, 76, 736, 524, 128, 152); // draw from 50,50 to 128, 152 on position 722,498	blit(my_pic, screen, 0, 76, 0, 524, 64, 152); // draws on the bottum left	blit(my_pic, screen, 64, 0, 736, 0, 128, 76); // want to draw on the upper right	readkey();		destroy_bitmap(my_pic);	return(0);}END_OF_MAIN();

Thanks for the help. [smile]

_________________Politics is the ability to foretell what is going to happen tomorrow, next week, next month and next year. And to have the ability afterwards to explain why it didn't happen. -- Winston ChurchillGDNet-0.2 - rate users the easy way with this nifty Firefox extension. Updated with new features.

Getting part of an image to blit to the upper right corner.

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