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SvgaLib/threeDKit/3dtext.c

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/*
Copyright (C) 1996, 1997 Paul Sheer
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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* 3dtext */
#include <config.h>
#include <stdlib.h>
#include <math.h>
#include <my_string.h>
#include <stdio.h>
#include <stdarg.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xresource.h>
#include "app_glob.c"
#include "coolwidget.h"
#include "widget3d.h"
#include "quickmath.h"
#include "dialog.h"
/*
this processes a text file into a 3d world
the text file contains the following commands seperated
by zero or more newlines. Charaacters after a # at the
beginning of a line are ignored.
# x, y, z, a, b, h, w, and c are floats. (x,y,z) is a vector.
scale a
# specifies the absolute value of the maximum extent of the scene in 3D space
# (after offset has been subtracted (see next)). This must come first.
offset x y z
# specifies the a vector that is to be subtracted from the given position of
# forthcoming object. Must also come before any drawing commands.
cylinder x y z a b c r
# draws a cylinder beginning at (a,b,c) ending at (a,b,c)+(x,y,z) of radius r
cappedcylinder x y z a b c r
# draws a cylinder beginning at (a,b,c) ending at (a,b,c)+(x,y,z) of radius r
# with closed ends.
surface a b x y z x y z x y z ... x y z
# draws a surface of grid size a by b there must be a*b (x, y, z) points.
trapezium x y z a b c u v w p q r
# draws a trapezium with one corner at (x,y,z) and the other three at (x,y,z)+(a,b,c) etc.
pipe r a x y z x y z x y z x y z ... x y z
# draw a pipe with corners at (x,y,z) the pipe diameter is r and the corner radii are a
* the first (x,y,z) is the start the last is the finish. Points mus be more than 2a appart
cappedpipe r a x y z x y z x y z x y z ... x y z
# same with closed ends
rectangle a b c x y z
# rectangle with (height,width,depth) = (x,y,z), corner at (a,b,c)
ellipse a b c x y z
# an ellipse with (height,width,depth) = (x,y,z), centre at (a,b,c)
density a
# will set the density of the grid making up any of the specific surfaces above.
# can be called before each surface command.
*/
/* globals: */
int GridDensity = 6;
double DimensionScale = 1;
Vec DimensionOffset = {0, 0, 0};
static inline void assignTD (TD_Point *p, Vec v)
{
p->x = (double) (v.x + DimensionOffset.x) * DimensionScale;
p->y = (double) (v.y + DimensionOffset.y) * DimensionScale;
p->z = (double) (v.z + DimensionOffset.z) * DimensionScale;
}
static void third_cyl (double t, TD_Point * p, Vec A, Vec X, Vec r1, Vec r2, int g, double f)
{
int i = 0;
double h;
double alpha = t;
Vec rv;
while (alpha < (2 * PI / 3 + t + 0.001)) {
for (h = 0; h <= 1; h += 0.5) {
rv = plus (plus (plus (times (r1, cos (alpha) * (1 + h * (f - 1))), times (r2, sin (alpha) * (1 + h * (f - 1)))), A), times (X, h));
assignTD(&(p[i]), rv);
i++;
}
alpha += (2 * PI / 3) / g;
}
}
void Cdraw3d_cone (const char *ident, double x, double y, double z, double a, double b, double c, double ra, double rb)
{
int g = 4 * GridDensity / 3;
TD_Point *p = Cmalloc ((g + 1) * 3 * sizeof (TD_Point));
Vec r1;
Vec r2;
Vec A, X;
double f = rb / ra;
A.x = a;
A.y = b;
A.z = c;
X.x = x;
X.y = y;
X.z = z;
orth_vectors (X, &r1, &r2, ra);
third_cyl (0, p, A, X, r1, r2, g, f);
Cinit_surf_points (ident, 3, g + 1, p);
third_cyl (2 * PI / 3, p, A, X, r1, r2, g, f);
Cinit_surf_points (ident, 3, g + 1, p);
third_cyl (4 * PI / 3, p, A, X, r1, r2, g, f);
Cinit_surf_points (ident, 3, g + 1, p);
free (p);
}
void Cdraw3d_cylinder (const char *ident, double x, double y, double z, double a, double b, double c, double r)
{
Cdraw3d_cone (ident, x, y, z, a, b, c, r, r);
}
void Cdraw3d_roundplate (const char *ident, double x, double y, double z, double a, double b, double c, double r)
{
TD_Point *p = Cmalloc ((GridDensity * 4 + 1) * 2 * sizeof (TD_Point));
double alpha = 0;
Vec r1;
Vec r2;
Vec rv;
Vec A;
Vec X;
int i = 0;
A.x = a;
A.y = b;
A.z = c;
X.x = x;
X.y = y;
X.z = z;
orth_vectors (X, &r1, &r2, r);
while (alpha < (2 * PI + 0.001)) {
rv = plus (plus (times (r1, cos (alpha)), times (r2, sin (alpha))), A);
assignTD (&p[i], rv);
i++;
assignTD (&p[i], A);
i++;
alpha += (2 * PI) / (GridDensity * 4);
}
Cinit_surf_points (ident, 2, GridDensity * 4 + 1, p);
free (p);
}
void Cdraw3d_cappedcylinder (const char *ident, double x, double y, double z, double a, double b, double c, double r)
{
Cdraw3d_cylinder (ident, x, y, z, a, b, c, r);
Cdraw3d_roundplate (ident, -x, -y, -z, a, b, c, r);
Cdraw3d_roundplate (ident, x, y, z, x + a, y + b, z + c, r);
}
void textformaterror (int line, const char *ident)
{
Cerrordialog (CMain, 20, 20, " Compile text to 3D ", " A text format error was encounted at line %d,\nwhile trying to draw 3d item to widget %s.\n ", line, ident);
}
void Cdraw3d_scale (const char *ident, double a)
{
DimensionScale = 32767 / a;
}
void Cdraw3d_offset (const char *ident, double x, double y, double z)
{
DimensionOffset.x = x;
DimensionOffset.y = y;
DimensionOffset.z = z;
}
void Cdraw3d_density (const char *ident, double a)
{
GridDensity = a;
}
void draw3d_surface(const char *ident, int w, int h, Vec *v)
{
int i;
TD_Point *p = Cmalloc (w * h * sizeof (TD_Point));
for(i=0;i<w*h;i++)
assignTD(&p[i], v[i]);
Cinit_surf_points (ident, w, h, p);
free (p);
}
void Cdraw3d_surface(const char *ident, int w, int h,...)
{
va_list pa;
int i;
TD_Point *p = Cmalloc (w * h * sizeof (TD_Point));
va_start(pa, h);
for(i = 0; i < w * h; i++) {
p[i].x = va_arg(pa, double);
p[i].y = va_arg(pa, double);
p[i].z = va_arg(pa, double);
p[i].dirx = 0;
p[i].diry = 0;
p[i].dirz = 0;
}
va_end(pa);
Cinit_surf_points (ident, w, h, p);
free (p);
}
static void fxchg (double *a, double *b)
{
double t = *a;
*a = *b;
*b = t;
}
void initellipsoidpart (TD_Point *p, double x, double y, double z,
double a, double b, double c, int w, int dir, double f)
{
int i, j;
Vec v;
double r;
int d = 2 * w + 1;
Vec X;
X.x = x;
X.y = y;
X.z = z;
for (i = -w; i <= w; i++)
for (j = -w; j <= w; j++) {
v.x = (double) j / w;
v.y = (double) i / w;
v.z = 1;
switch (dir) {
case 0:
v.z = -v.z;
fxchg (&v.x, &v.y);
break;
case 1:
v.y = -v.y;
fxchg (&v.x, &v.z);
break;
case 2:
v.z = -v.z;
fxchg (&v.x, &v.z);
break;
case 3:
v.y = -v.y;
fxchg (&v.y, &v.z);
break;
case 4:
v.z = -v.z;
fxchg (&v.y, &v.z);
break;
}
r = norm (v);
v.x *= (f + (1 - f) / r) * a;
v.y *= (f + (1 - f) / r) * b;
v.z *= (f + (1 - f) / r) * c;
assignTD(&p[i + w + (j + w) * d], plus(v, X));
}
}
void Cdraw3d_ellipsoid (const char *ident, double x, double y, double z, double a, double b, double c, double f)
{
int w = GridDensity / 2;
int g = 2 * w + 1;
TD_Point *p = Cmalloc (g * g * sizeof (TD_Point));
initellipsoidpart (p, x, y, z, a, b, c, w, 0, f);
Cinit_surf_points (ident, g, g, p);
initellipsoidpart (p, x, y, z, a, b, c, w, 1, f);
Cinit_surf_points (ident, g, g, p);
initellipsoidpart (p, x, y, z, a, b, c, w, 2, f);
Cinit_surf_points (ident, g, g, p);
initellipsoidpart (p, x, y, z, a, b, c, w, 3, f);
Cinit_surf_points (ident, g, g, p);
initellipsoidpart (p, x, y, z, a, b, c, w, 4, f);
Cinit_surf_points (ident, g, g, p);
initellipsoidpart (p, x, y, z, a, b, c, w, 5, f);
Cinit_surf_points (ident, g, g, p);
free (p);
}
void Cdraw3d_cappedcone (const char *ident, double x, double y, double z, double a, double b, double c, double ra, double rb)
{
Cdraw3d_cone (ident, x, y, z, a, b, c, ra, rb);
Cdraw3d_roundplate (ident, -x, -y, -z, a, b, c, ra);
Cdraw3d_roundplate (ident, x, y, z, x + a, y + b, z + c, rb);
}
void Cdraw3d_rectangle (const char *ident, double x, double y, double z, double a, double b, double c)
{
Cdraw3d_ellipsoid (ident, x, y, z, a, b, c, 1);
}
void Cdraw3d_sphere (const char *ident, double x, double y, double z, double r)
{
Cdraw3d_ellipsoid (ident, x, y, z, r, r, r, 0);
}
/* returns -1 on error, zero on success */
int Cdraw3d_from_text (const char *ident, const char *text)
{
char *p = (char *) text;
int line = 1;
double x, y, z, a, b, c, r, r2;
Vec *v;
int w, h, i, k;
do {
p += strspn(p, " \t\r");
if(!*p)
break;
if (*p == '#' || *p == '\n') {
/* comment, do nothing */ ;
} else if (!strncmp (p, "scale ", 6)) {
if (sscanf (p, "scale %lf", &x) == 1)
Cdraw3d_scale (ident, x);
else {
textformaterror (line, ident);
return -1;
}
} else if (!strncmp (p, "offset ", 7)) {
if (sscanf (p, "offset %lf %lf %lf", &x, &y, &z) == 3)
Cdraw3d_offset (ident, x, y, z);
else {
textformaterror (line, ident);
return -1;
}
} else if (!strncmp (p, "density ", 7)) {
if (sscanf (p, "density %lf", &x) == 1)
Cdraw3d_density (ident, x);
else {
textformaterror (line, ident);
return -1;
}
} else if (!strncmp (p, "cylinder ", 8)) {
if (sscanf (p, "cylinder %lf %lf %lf %lf %lf %lf %lf", &x, &y, &z, &a, &b, &c, &r) == 7)
Cdraw3d_cylinder (ident, x, y, z, a, b, c, r);
else {
textformaterror (line, ident);
return -1;
}
} else if (!strncmp (p, "roundplate ", 11)) {
if (sscanf (p, "roundplate %lf %lf %lf %lf %lf %lf %lf", &x, &y, &z, &a, &b, &c, &r) == 7) {
Cdraw3d_roundplate (ident, x, y, z, a, b, c, r);
Cdraw3d_roundplate (ident, -x, -y, -z, a, b, c, r);
} else {
textformaterror (line, ident);
return -1;
}
} else if (!strncmp (p, "cone ", 5)) {
if (sscanf (p, "cone %lf %lf %lf %lf %lf %lf %lf %lf", &x, &y, &z, &a, &b, &c, &r, &r2) == 8)
Cdraw3d_cone (ident, x, y, z, a, b, c, r, r2);
else {
textformaterror (line, ident);
return -1;
}
} else if (!strncmp (p, "cappedcone ", 11)) {
if (sscanf (p, "cappedcone %lf %lf %lf %lf %lf %lf %lf %lf", &x, &y, &z, &a, &b, &c, &r, &r2) == 8)
Cdraw3d_cappedcone (ident, x, y, z, a, b, c, r, r2);
else {
textformaterror (line, ident);
return -1;
}
} else if (!strncmp (p, "cappedcylinder ", 15)) {
if (sscanf (p, "cappedcylinder %lf %lf %lf %lf %lf %lf %lf", &x, &y, &z, &a, &b, &c, &r) == 7) {
Cdraw3d_cappedcylinder (ident, x, y, z, a, b, c, r);
} else {
textformaterror (line, ident);
return -1;
}
} else if (!strncmp (p, "ellipsoid ", 10)) {
if (sscanf (p, "ellipsoid %lf %lf %lf %lf %lf %lf %lf", &x, &y, &z, &a, &b, &c, &r) == 7) {
Cdraw3d_ellipsoid (ident, x, y, z, a, b, c, r);
} else {
textformaterror (line, ident);
return -1;
}
} else if (!strncmp (p, "rectangle ", 10)) {
if (sscanf (p, "rectangle %lf %lf %lf %lf %lf %lf", &x, &y, &z, &a, &b, &c) == 6) {
Cdraw3d_rectangle (ident, x, y, z, a, b, c);
} else {
textformaterror (line, ident);
return -1;
}
} else if (!strncmp (p, "sphere ", 7)) {
if (sscanf (p, "sphere %lf %lf %lf %lf ", &x, &y, &z, &r) == 4) {
Cdraw3d_sphere (ident, x, y, z, r);
} else {
textformaterror (line, ident);
return -1;
}
} else if (!strncmp (p, "surface ", 8)) {
if (sscanf (p, "surface %d %d %n", &w, &h, &i) == 2) {
v = Cmalloc(w * h * sizeof(Vec));
for(k = 0; k < w * h; k++) {
p += i;
if(sscanf(p, "%lf %lf %lf %n", &(v[k].x), &(v[k].y), &(v[k].z), &i) != 3) {
textformaterror (line, ident);
free(v);
return -1;
}
}
draw3d_surface(ident, w, h, v);
free(v);
} else {
textformaterror (line, ident);
return -1;
}
} else {
textformaterror (line, ident);
return -1;
}
while (*p != '\n' && *p)
p++;
line++;
} while (*(p++));
Credraw3dobject(ident, 1);
return 0;
}
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