how can i turn and rotate sprites in VB?

: how can i turn and rotate sprites in VB?<br>
: <br>
<br>
To turn sprites in vb, you must exchange the image box coordinates properties. For example: you have the coordinates (x1,y1)-(x2, y2), you only change the values of x1 to x2 and x2 to x1, to flip it horizontally, and change y1 to y2 and y2 to y1 to flip vertically. To rotate the bitmap, you needed to resize the bitmap, and make sine and cossine calcs. This is VERY COMPLICATED AND STUPID TO DO in VB.<br>
If, with this, you are planning to make a game, QUIT IT NOW!!!! Visual Basic is not a gaming-purpose language. It is not made to allow game making. Learn C and Assembly. They are not hard languages and they are very useful since games like WarCraft II and Diablo are made off..<br>
<br>
- LordAsm -<br>

: how can i turn and rotate sprites in VB?<br>
: <br>
And this is difficult question if you want to rotate on 1,2,3,...etc degrees. Rotating on 90 degrees is the easiest you can do, but how to solve this problem?<br>
<br>
Of course use cos, sin and other math things, but the problem is that if you rotate on 15 degrees there exist some black holes in your sprite!<br>
<br>
how to solve this?<br>
Oleg<br>
<br>
<br>



URL:www.hot.ee/olegus

I think you can get rid of the holes by rotating from target to source instead of the other way,<br>
<br>
s = source, t = target, c = center<br>
<br>
xt = xc + xs * cos ==> xs = ( xt - xc ) / cos<br>
yt = yc - ys * sin ==> ys = -( yt - yc ) / sin<br>
<br>
so first find the 4 boundary points<br>
<br>
x1 = xc + ( -width/2 ) * cos<br>
x2 = xc + ( +width/2 ) * cos<br>
y1 = yc - ( -height/2 ) * sin<br>
y2 = yc - ( +height/2 ) * sin<br>
<br>
and now you do:<br>
for( yt = y1; yt <= y2; yt++ )<br>
for( xt = x1; xt <= x2; xt++ )<br>
{<br>
xs = ( xt - xc ) / cos<br>
ys = -(yt - yc ) / sin<br>
<br>
// need to check if pixel is in sprite, remember, we are testing the big box of the rotated image<br>
if( xs >= 0 && xs < width && ys >= 0 && ys < height )<br>
{<br>
color = color_from_sprite( xs, ys );<br>
draw( xt, yt, color );<br>
}<br>
}<br>
<br>
Hope this was helpful<br>
<br>
: : how can i turn and rotate sprites in VB?<br>
: : <br>
: And this is difficult question if you want to rotate on 1,2,3,...etc degrees. Rotating on 90 degrees is the easiest you can do, but how to solve this problem?<br>
: <br>
: Of course use cos, sin and other math things, but the problem is that if you rotate on 15 degrees there exist some black holes in your sprite!<br>
: <br>
: how to solve this?<br>
: Oleg<br>
: <br>
: <br>
: <br>
: <br>
<br>

look bros i was actually asking for help with VB. i'm not sure if i mentioned this but if i haven't then i'm sorry. and do you think you could tell me how to do that in VB and not VC or C whichever you told me in???<br>
<br>
: I think you can get rid of the holes by rotating from target to source instead of the other way,<br>
: <br>
: s = source, t = target, c = center<br>
: <br>
: xt = xc + xs * cos ==> xs = ( xt - xc ) / cos<br>
: yt = yc - ys * sin ==> ys = -( yt - yc ) / sin<br>
: <br>
: so first find the 4 boundary points<br>
: <br>
: x1 = xc + ( -width/2 ) * cos<br>
: x2 = xc + ( +width/2 ) * cos<br>
: y1 = yc - ( -height/2 ) * sin<br>
: y2 = yc - ( +height/2 ) * sin<br>
: <br>
: and now you do:<br>
: for( yt = y1; yt <= y2; yt++ )<br>
: for( xt = x1; xt <= x2; xt++ )<br>
: {<br>
: xs = ( xt - xc ) / cos<br>
: ys = -(yt - yc ) / sin<br>
: <br>
: // need to check if pixel is in sprite, remember, we are testing the big box of the rotated image<br>
: if( xs >= 0 && xs < width && ys >= 0 && ys < height )<br>
: {<br>
: color = color_from_sprite( xs, ys );<br>
: draw( xt, yt, color );<br>
: }<br>
: }<br>
: <br>
: Hope this was helpful<br>
: <br>
: : : how can i turn and rotate sprites in VB?<br>
: : : <br>
: : And this is difficult question if you want to rotate on 1,2,3,...etc degrees. Rotating on 90 degrees is the easiest you can do, but how to solve this problem?<br>
: : <br>
: : Of course use cos, sin and other math things, but the problem is that if you rotate on 15 degrees there exist some black holes in your sprite!<br>
: : <br>
: : how to solve this?<br>
: : Oleg<br>
: : <br>
: : <br>
: : <br>
: : <br>
: <br>
: <br>
: <br>
<br>

Try to understand!<br>
it can't be done with VB!<br>
VB is way too slow, and crappy.<br>
<br>
: look bros i was actually asking for help with VB. i'm not sure if i mentioned this but if i haven't then i'm sorry. and do you think you could tell me how to do that in VB and not VC or C whichever you told me in???<br>
: <br>
: : I think you can get rid of the holes by rotating from target to source instead of the other way,<br>
: : <br>
: : s = source, t = target, c = center<br>
: : <br>
: : xt = xc + xs * cos ==> xs = ( xt - xc ) / cos<br>
: : yt = yc - ys * sin ==> ys = -( yt - yc ) / sin<br>
: : <br>
: : so first find the 4 boundary points<br>
: : <br>
: : x1 = xc + ( -width/2 ) * cos<br>
: : x2 = xc + ( +width/2 ) * cos<br>
: : y1 = yc - ( -height/2 ) * sin<br>
: : y2 = yc - ( +height/2 ) * sin<br>
: : <br>
: : and now you do:<br>
: : for( yt = y1; yt <= y2; yt++ )<br>
: : for( xt = x1; xt <= x2; xt++ )<br>
: : {<br>
: : xs = ( xt - xc ) / cos<br>
: : ys = -(yt - yc ) / sin<br>
: : <br>
: : // need to check if pixel is in sprite, remember, we are testing the big box of the rotated image<br>
: : if( xs >= 0 && xs < width && ys >= 0 && ys < height )<br>
: : {<br>
: : color = color_from_sprite( xs, ys );<br>
: : draw( xt, yt, color );<br>
: : }<br>
: : }<br>
: : <br>
: : Hope this was helpful<br>
: : <br>
: : : : how can i turn and rotate sprites in VB?<br>
: : : : <br>
: : : And this is difficult question if you want to rotate on 1,2,3,...etc degrees. Rotating on 90 degrees is the easiest you can do, but how to solve this problem?<br>
: : : <br>
: : : Of course use cos, sin and other math things, but the problem is that if you rotate on 15 degrees there exist some black holes in your sprite!<br>
: : : <br>
: : : how to solve this?<br>
: : : Oleg<br>
: : : <br>
: : : <br>
: : : <br>
: : : <br>
: : <br>
: : <br>
: : <br>
: <br>
: <br>
: <br>
<br>