xmantaray2 Wiki

X11 3D and 3D hacks engine (the proceeding of xmantaray)

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examples

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Examples

0 Introduction

These can be found in the examples directory, they replace your main.cc file.

1 Drawing a cube with normal mapping that moves to the right and rotates


// See main.orig.cc

{

 double thetax = 1.2;

 double thetay = 1.2;

 double thetaz = 1.2;
/ make cube model instance, width = 3 /
ray3d::CubeModel cm(dpyb.get_display(),&w,&gc,3);
/ make a matrix (e.g. for rotating) engine /
ray3d::Engine engine(thetax,0,0,0.9,100,10,1.2); 
/ fill it up with a color (given to draw_offset) /
cm.fill(dpyb.get_display(), &w,200,200); 
/ start a window event loop (also processes X11 events) /
XEvent e;
for (;;) { 
/ rotate cube with angles /
 cm.rotate(engine, thetax, thetay, thetaz);


/ draw it at x == 200 , y == 200 pixels in the orange red color /
 cm.draw_offset(dpyb.get_display(), &w,200,200,200,const_cast<char*>("orange red"));


/ translate to z == -60 /
 cm.translate(engine, 0, 0, -60);


/ process window management e.g. moving via the titlebar /
 xmantaray.eventloop(xmantaray,&e);


/ update rotating angles /
thetax += 0.1;
thetay += 0.1;
thetaz += 0.1;


}

}

2 Drawing a plane grid in a 3D world

// See main.planegrid.cc
{
double thetax = 1.2;
double thetay = 1.2;
double thetaz = 1.2;

/ make planegrid model /

ray3d::game::PlaneGrid planegrid(dpyb.get_display(),&w,100,100);

/ make a matrix (e.g. for rotating) engine /

ray3d::Engine engine(thetax,0,0,0.9,100,10,1.2);

/ give the plane a depth perspective, 2 far points and 2 near points /

planegrid.depth_f(0.55,0.55);

/ put the planegrid further away in the 3D world /

planegrid.perspective(-20,20,PI/180*270);

/ start a window event loop (also processes X11 events) /

XEvent e;

for (;;) {

/ rotate cube with angles /

planegrid.rotate(engine, thetax, thetay, thetaz);

/ draw it /

 planegrid.draw(dpyb.get_display(),&w, 100,100);

/ process window management e.g. moving via the titlebar /

 xmantaray.eventloop(xmantaray,&e);

/ update rotating angles in radians /

thetax += 0.1;
thetay += 0.1;
thetaz += 0.1;

}
}

3 Drawing a grid which rotates

//See main.cc in top directory.


    ray3d::game::PlaneGrid planegrid(dpyb.get_display(),&w,100,100);
    planegrid.depth_f(0.55,0.55);
    double perspectiveangle = PI/180*90;
    planegrid.perspective(-2,2,perspectiveangle);
    planegrid.map(&dpy,&w,"./pics/texturetest1.xpm",600,375);

    double thetax = 0.2;
    double thetay = 0.2;
    double thetaz = 0.2;

    ray3d::Engine engine(thetax,0,0,0.9,100,10,1.2);
    const char *colorname = "chartreuse";
    XEvent e;

    for (int k = 0; k < 100000; k++) {

    /* blank screen */

    XFillRectangle(dpy, titlebarw, gc,0,0,800,20);
    XFillRectangle(dpy, w, gc,0,0,800,600);

    /* draw 3d world */
    planegrid.draw(dpyb.get_display(),&w, 100,100);
    planegrid.perspective(-2,2,perspectiveangle);
    planegrid.map(&dpy,&w,"./pics/texturetest1.xpm",600,375);
    //planegrid.rotate(engine, thetax, thetay, thetaz);


    xmantaray.eventloop(xmantaray,&e);

    /* update movement of world */

    perspectiveangle += 0.1;
    thetax += 0.01;
    thetay += 0.01;
    thetaz += 0.01;

    struct timespec ts;
    ts.tv_sec = 0;        /* seconds */
    ts.tv_nsec = 500000000;       /* nanoseconds */

    nanosleep(&ts,NULL);
    XFlush(dpy);

} }

License of the code on this page : GPL version 2

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses/.
*/

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