/* Transform body normals, draw front */
void drawbody(Matrix Rot)
{
double bodyScale = 1.0/theBodyRadius;
register int i, j, k, n;
pushmatrix();
scale(bodyScale, bodyScale, bodyScale);
for (j=0; j<bodyNFaces; j++) {
double dot = Rot[X][Z]*theFaceNormals[j][X]
+Rot[Y][Z]*theFaceNormals[j][Y]
+Rot[Z][Z]*theFaceNormals[j][Z];
if (dot>0.0) { /* Front-facing polygon, so draw it */
short shadedColor[3];
dot += 0.4;
if (dot>1.0) dot = 1.0;
shadedColor[0] = dot*theFaceColors[j][0];
shadedColor[1] = dot*theFaceColors[j][1];
shadedColor[2] = dot*theFaceColors[j][2];
n = theFaceVertices[j][0];
RGBcolor(shadedColor[0], shadedColor[1], shadedColor[2]);
bgnpolygon();
for (k=1; k<=n; k++) {
i = theFaceVertices[j][k];
v4f(thePoints[i]);
}
endpolygon();
}
}
popmatrix();
}
/*
* drawpoly
*
* draw some polygons
*/
void
drawpoly()
{
float vec[3];
short val;
color(YELLOW);
/*
* Draw a polygon using poly, parray is our array of
* points and 4 is the number of points in it.
*/
poly(4L, parray);
color(GREEN);
/*
* Draw a 5 sided figure by using bgnpolygon, v3d, and endpolygon
*/
polymode(PYM_LINE);
bgnpolygon();
vec[0] = 0.0;
vec[1] = 0.0;
vec[2] = 0.0;
v3f(vec);
vec[0] = 3.0;
vec[1] = 0.0;
vec[2] = 0.0;
v3f(vec);
vec[0] = 3.0;
vec[1] = 4.0;
vec[2] = 0.0;
v3f(vec);
vec[0] = -1.0;
vec[1] = 5.0;
vec[2] = 0.0;
v3f(vec);
vec[0] = -2.0;
vec[1] = 2.0;
vec[2] = 0.0;
v3f(vec);
endpolygon();
color(MAGENTA);
/*
* draw a sector representing a 1/4 circle
*/
arc(1.5, -7.0, 3.0, 0, 900);
move2(1.5, -7.0);
draw2(1.5, -4.0);
move2(1.5, -7.0);
draw2(4.5, -7.0);
qread(&val);
}
void drawsegment(filter *f)
{
float delx, dely;
float wid, *fptr;
float px, py, nx, ny;
wid = 0.04-f->vel;
wid = wid*width;
if(wid<0.00001)
wid = 0.00001;
delx = f->angx*wid;
dely = f->angy*wid;
color(0);
px = f->lastx;
py = f->lasty;
nx = f->curx;
ny = f->cury;
fptr = polyverts+8*npolys;
bgnpolygon();
fptr[0] = px+odelx;
fptr[1] = py+odely;
v2f(fptr);
fptr += 2;
fptr[0] = px-odelx;
fptr[1] = py-odely;
v2f(fptr);
fptr += 2;
fptr[0] = nx-delx;
fptr[1] = ny-dely;
v2f(fptr);
fptr += 2;
fptr[0] = nx+delx;
fptr[1] = ny+dely;
v2f(fptr);
fptr += 2;
endpolygon();
npolys++;
if(npolys>=MAXPOLYS) {
fprintf(stderr,"out of polys - increase the define MAXPOLYS\n");
npolys--;
}
fptr -= 8;
bgnclosedline();
v2f(fptr);
fptr += 2;
v2f(fptr);
fptr += 2;
v2f(fptr);
fptr += 2;
v2f(fptr);
fptr += 2;
endclosedline();
odelx = delx;
odely = dely;
}
static void triangle(
float x1, float y1, float z1,
float x2, float y2, float z2,
float x3, float y3, float z3
) {
bgnpolygon();
vertex(x1, y1, z1);
vertex(x2, y2, z2);
vertex(x3, y3, z3);
endpolygon();
}
