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GL3.2 for AIX: Graphics Library (GL) Technical Reference
setshade.c Example C Language Program
/*
Example setshade.c:
Moves a smooth-shaded polygon in and out of the graphics port.
Press LEFTMOUSE to exit.
*/
#include <gl/gl.h>
#include <gl/device.h>
main()
{
unsigned short i;
Coord x;
prefposition(XMAXSCREEN/4,XMAXSCREEN*3/4,YMAXSCREEN/4,YMAXSCREEN*3/4);
winopen("setshade/clip test");
doublebuffer();
gconfig();
get_cmap();
for (i=0; i<128; i++)
mapcolor(128+i, 2*i, 0, 2*i);
makeobj(1);
color(128+127);
pmv2i(100,-100);
color(128+0);
pdr2i(100,100);
color(128+127);
pdr2i(-100,100);
color(128+0);
pdr2i(-100,-100);
pclos();
closeobj();
while (!getbutton(LEFTMOUSE)) {
for (x = -150.0; x < 150.0; x++) {
color(CYAN);
clear();
pushmatrix();
translate(x,150.0,0.0);
rotate(300,'z');
callobj(1);
popmatrix();
swapbuffers();
if (getbutton(LEFTMOUSE))
break;
}
for (x=150.0; x>-150.0; x--) {
color(CYAN);
clear();
pushmatrix();
translate(x,150.0,0.0);
rotate(300,'z');
callobj(1);
popmatrix();
swapbuffers();
if (getbutton(LEFTMOUSE))
break;
}
}
restore_cmap();
gexit();
}
#define lo_end 128
#define hi_end 255
static Int16 CarrayR[hi_end+1], CarrayG[hi_end+1], CarrayB[hi_end+1];
get_cmap()
{
getmcolors ((Int16)lo_end,(Int16)hi_end, CarrayR, CarrayG, CarrayB);
}
restore_cmap()
{
mapcolors ((Int16)lo_end,(Int16)hi_end, CarrayR, CarrayG, CarrayB);
}
/*
Changes:
- This needed the pclos() call after defining the polygon
- The mapcolor were changed to mapcolors
- The getmcolor were changed to getmcolors
- The mapcolors needs casting to an integer
- loop constructs removed from restore_cmap and get_cmap
- the index variable was removed
*/
Related Information
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