GP32 Blitting Only Part Of An Image...

[nerd of nerds]

hello, i am just now starting to get "serious" about gp32 programming...doing more things with gfx and such...

how do blit just part of a bitmap to the screen? so i can make a sprite engine and whatnot...i will be blitting from C files FYI

thanks!

edit: mega gp mania w00t!!! :lol:

 

[woogal]

GpBitBlt(NULL,&gpDraw[backbuf], spritex, spritey, spritewidth, spriteheight, (unsigned char*)image_with_sprites, spritexoffset, spriteyoffset, spriteimagewidth, spriteimageheight);

spriteimagewidth and spriteimageheight are the width and height of your image containing all the sprites, not the width and height of the individual sprite.

 

[nerd of nerds]

sooo, if i had a, say, 30x60 size image and it had 2 parts of a sprite (each part being 30x30) and i told it spriteimagewidth and spriteimageheight were 30 and 30 it would blit the first part, then what would i do for the other half? (an example would be perfect )

 

[don]

I'm pretty sure that's what spritexoffset and spriteyoffset are for.

 

[nerd of nerds]

ok, let me explain...i am not an experienced coder...i have just done pretty simple things... drawing a perfect circle of dots, hello world...stuff like that, so i really need an example of code...

 

[Daz_Genetic]

If you really can't understand it, you don't need to keep all your sprites in the same image. You could just load each one seperately.

 

[woogal]

sooo, if i had a, say, 30x60 size image and it had 2 parts of a sprite (each part being 30x30) and i told it spriteimagewidth and spriteimageheight were 30 and 30 it would blit the first part, then what would i do for the other half? (an example would be perfect )

No, spriteimagewidth and height are the width and height of your original image with both sprites in it (in this case 30 and 60). To blt the first sprite to a position of xpos and ypos you'd do this -

GpBitBlt(NULL,&gpDraw[backbuf], xpos, ypos, 30, 30, (unsigned char*)image_with_sprites, 0, 0, 30, 60);

or to blt the second sprite to the same position -

GpBitBlt(NULL,&gpDraw[backbuf], xpos, ypos, 30, 30, (unsigned char*)image_with_sprites, 0, 30, 30, 60);

 

[gp32rich]

Try this file.
The images are in c files, as far as I remember

http://www.gp32x.de/gp32download.php?do_w...fileinfo&id=123


It worked for me