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fltk/test/fractals.cxx
Greg Ercolano 1f55bfe65c Issue #109 contd: missed fractals.cxx fixes, also fix parens issue. 
Missed mods to fractals.cxx.
Also fixed a parens issue Albrecht noticed on the Mac build.
2021-02-15 17:46:15 -08:00

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//
// Fractal drawing demo for the Fast Light Tool Kit (FLTK).
//
// This is a GLUT demo program, with modifications to
// demonstrate how to add FLTK controls to a GLUT program. The GLUT
// code is unchanged except for the end (search for FLTK to find changes).
//
// Copyright 1998-2016 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
#include <config.h>
#if !HAVE_GL || !HAVE_GL_GLU_H
#include <FL/Fl.H>
#include <FL/fl_message.H>
int main(int, char**) {
fl_alert("This demo does not work without GL and GLU");
return 1;
}
#else
/*
* To compile: cc -o fractals fractals.c -lGL -lGLU -lX11 -lglut -lXmu -lm
*
* Usage: fractals
*
* Homework 6, Part 2: fractal mountains and fractal trees
* (Pretty Late)
*
* Draws fractal mountains and trees -- and an island of mountains in water
* (I tried having trees on the island but it didn't work too well.)
*
* Two viewer modes: polar and flying (both restrained to y>0 for up vector).
* Keyboard 0->9 and +/- control speed when flying.
*
* Only keyboard commands are 0-9 and +/- for speed in flying mode.
*
* Fog would make the island look much better, but I couldn't get it to work
* correctly. Would line up on -z axis not from eye.
*
* Philip Winston - 3/4/95
* pwinston@hmc.edu
* http://www.cs.hmc.edu/people/pwinston
*
*/
#include <FL/glut.H>
#include <FL/glu.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <limits.h> /* ULONG_MAX is defined here */
#include <float.h> /* FLT_MAX is atleast defined here */
#include <time.h> /* for random seed */
#include "fracviewer.h"
#if defined(_WIN32)
# define drand48() (((float) rand())/((float) RAND_MAX))
# define srand48(x) (srand((x)))
#elif defined __APPLE__
# define drand48() (((float) rand())/((float) RAND_MAX))
# define srand48(x) (srand((x)))
#endif
typedef enum { NOTALLOWED, MOUNTAIN, TREE, ISLAND, BIGMTN, STEM, LEAF,
MOUNTAIN_MAT, WATER_MAT, LEAF_MAT, TREE_MAT, STEMANDLEAVES,
AXES } DisplayLists;
#define MAXLEVEL 8
int Rebuild = 1, /* Rebuild display list in next display? */
fractal = TREE, /* What fractal are we building */
Level = 4; /* levels of recursion for fractals */
int DrawAxes = 0;
/***************************************************************/
/************************* VECTOR JUNK *************************/
/***************************************************************/
/* print vertex to stderr */
void printvert(float v[3])
{
fprintf(stderr, "(%f, %f, %f)\n", v[0], v[1], v[2]);
}
#if 0 // removed for FL, it is in fracviewer.c
/* normalizes v */
void normalize(GLfloat v[3])
{
GLfloat d = sqrt(v[0]*v[0] + v[1]*v[1] + v[2]*v[2]);
if (d == 0)
fprintf(stderr, "Zero length vector in normalize\n");
else
v[0] /= d; v[1] /= d; v[2] /= d;
}
/* calculates a normalized crossproduct to v1, v2 */
void ncrossprod(float v1[3], float v2[3], float cp[3])
{
cp[0] = v1[1]*v2[2] - v1[2]*v2[1];
cp[1] = v1[2]*v2[0] - v1[0]*v2[2];
cp[2] = v1[0]*v2[1] - v1[1]*v2[0];
normalize(cp);
}
#endif
/* calculates normal to the triangle designated by v1, v2, v3 */
void triagnormal(float v1[3], float v2[3], float v3[3], float norm[3])
{
float vec1[3], vec2[3];
vec1[0] = v3[0] - v1[0]; vec2[0] = v2[0] - v1[0];
vec1[1] = v3[1] - v1[1]; vec2[1] = v2[1] - v1[1];
vec1[2] = v3[2] - v1[2]; vec2[2] = v2[2] - v1[2];
ncrossprod(vec2, vec1, norm);
}
float xzlength(float v1[3], float v2[3])
{
return sqrtf((v1[0] - v2[0])*(v1[0] - v2[0]) +
(v1[2] - v2[2])*(v1[2] - v2[2]));
}
float xzslope(float v1[3], float v2[3])
{
return ((v1[0] != v2[0]) ? ((v1[2] - v2[2]) / (v1[0] - v2[0]))
: FLT_MAX);
}
/***************************************************************/
/************************ MOUNTAIN STUFF ***********************/
/***************************************************************/
GLfloat DispFactor[MAXLEVEL]; /* Array of what to multiply random number
by for a given level to get midpoint
displacement */
GLfloat DispBias[MAXLEVEL]; /* Array of what to add to random number
before multiplying it by DispFactor */
#define NUMRANDS 191
float RandTable[NUMRANDS]; /* hash table of random numbers so we can
raise the same midpoints by the same amount */
/* The following are for permitting an edge of a moutain to be */
/* pegged so it won't be displaced up or down. This makes it */
/* easier to setup scenes and makes a single moutain look better */
GLfloat Verts[3][3], /* Vertices of outside edges of mountain */
Slopes[3]; /* Slopes between these outside edges */
int Pegged[3]; /* Is this edge pegged or not */
/*
* Comes up with a new table of random numbers [0,1)
*/
void InitRandTable(unsigned int seed)
{
int i;
srand48((long) seed);
for (i = 0; i < NUMRANDS; i++)
RandTable[i] = drand48() - 0.5f;
}
/* calculate midpoint and displace it if required */
void Midpoint(GLfloat mid[3], GLfloat v1[3], GLfloat v2[3],
int edge, int level)
{
unsigned hash;
mid[0] = (v1[0] + v2[0]) / 2;
mid[1] = (v1[1] + v2[1]) / 2;
mid[2] = (v1[2] + v2[2]) / 2;
if (!Pegged[edge] || (fabs(xzslope(Verts[edge], mid)
- Slopes[edge]) > 0.00001)) {
srand48((int)((v1[0]+v2[0])*23344));
hash = unsigned(drand48() * 7334334);
srand48((int)((v2[2]+v1[2])*43433));
hash = (unsigned)(drand48() * 634344 + hash) % NUMRANDS;
mid[1] += ((RandTable[hash] + DispBias[level]) * DispFactor[level]);
}
}
/*
* Recursive moutain drawing routine -- from lecture with addition of
* allowing an edge to be pegged. This function requires the above
* globals to be set, as well as the Level global for fractal level
*/
static float cutoff = -1;
void FMR(GLfloat v1[3], GLfloat v2[3], GLfloat v3[3], int level)
{
if (level == Level) {
GLfloat norm[3];
if (v1[1] <= cutoff && v2[1]<=cutoff && v3[1]<=cutoff) return;
triagnormal(v1, v2, v3, norm);
glNormal3fv(norm);
glVertex3fv(v1);
glVertex3fv(v2);
glVertex3fv(v3);
} else {
GLfloat m1[3], m2[3], m3[3];
Midpoint(m1, v1, v2, 0, level);
Midpoint(m2, v2, v3, 1, level);
Midpoint(m3, v3, v1, 2, level);
FMR(v1, m1, m3, level + 1);
FMR(m1, v2, m2, level + 1);
FMR(m3, m2, v3, level + 1);
FMR(m1, m2, m3, level + 1);
}
}
/*
* sets up lookup tables and calls recursive mountain function
*/
void FractalMountain(GLfloat v1[3], GLfloat v2[3], GLfloat v3[3],
int pegged[3])
{
GLfloat lengths[MAXLEVEL];
GLfloat fraction[8] = { 0.3f, 0.3f, 0.4f, 0.2f, 0.3f, 0.2f, 0.4f, 0.4f };
GLfloat bias[8] = { 0.1f, 0.1f, 0.1f, 0.1f, 0.1f, 0.1f, 0.1f, 0.1f };
int i;
float avglen = (xzlength(v1, v2) +
xzlength(v2, v3) +
xzlength(v3, v1) / 3);
for (i = 0; i < 3; i++) {
Verts[0][i] = v1[i]; /* set mountain vertex globals */
Verts[1][i] = v2[i];
Verts[2][i] = v3[i];
Pegged[i] = pegged[i];
}
Slopes[0] = xzslope(Verts[0], Verts[1]); /* set edge slope globals */
Slopes[1] = xzslope(Verts[1], Verts[2]);
Slopes[2] = xzslope(Verts[2], Verts[0]);
lengths[0] = avglen;
for (i = 1; i < Level; i++) {
lengths[i] = lengths[i-1]/2; /* compute edge length for each level */
}
for (i = 0; i < Level; i++) { /* DispFactor and DispBias arrays */
DispFactor[i] = (lengths[i] * ((i <= 7) ? fraction[i] : fraction[7]));
DispBias[i] = ((i <= 7) ? bias[i] : bias[7]);
}
glBegin(GL_TRIANGLES);
FMR(v1, v2, v3, 0); /* issues no GL but vertex calls */
glEnd();
}
/*
* draw a mountain and build the display list
*/
void CreateMountain(void)
{
GLfloat v1[3] = { 0, 0, -1 }, v2[3] = { -1, 0, 1 }, v3[3] = { 1, 0, 1 };
int pegged[3] = { 1, 1, 1 };
glNewList(MOUNTAIN, GL_COMPILE);
glPushAttrib(GL_LIGHTING_BIT);
glCallList(MOUNTAIN_MAT);
FractalMountain(v1, v2, v3, pegged);
glPopAttrib();
glEndList();
}
/*
* new random numbers to make a different moutain
*/
void NewMountain(void)
{
InitRandTable((unsigned int)time(NULL));
}
/***************************************************************/
/***************************** TREE ****************************/
/***************************************************************/
long TreeSeed; /* for srand48 - remember so we can build "same tree"
at a different level */
/*
* recursive tree drawing thing, fleshed out from class notes pseudocode
*/
void FractalTree(int level, long level_seed)
{
if (level == Level) {
glPushMatrix();
glRotatef(drand48()*180, 0, 1, 0);
glCallList(STEMANDLEAVES);
glPopMatrix();
} else {
glCallList(STEM);
glPushMatrix();
glRotatef(drand48()*180.0f, 0.0f, 1.0f, 0.0f);
glTranslatef(0.0f, 1.0f, 0.0f);
glScalef(0.7f, 0.7f, 0.7f);
srand48(level_seed+1);
glPushMatrix();
glRotatef(110.0f + drand48()*40.0f, 0.0f, 1.0f, 0.0f);
glRotatef( 30.0f + drand48()*20.0f, 0.0f, 0.0f, 1.0f);
FractalTree(level + 1, level_seed+4);
glPopMatrix();
srand48(level_seed+2);
glPushMatrix();
glRotatef(-130.0f + drand48()*40.0f, 0.0f, 1.0f, 0.0f);
glRotatef( 30.0f + drand48()*20.0f, 0.0f, 0.0f, 1.0f);
FractalTree(level + 1, level_seed+5);
glPopMatrix();
srand48(level_seed+3);
glPushMatrix();
glRotatef(-20.0f + drand48()*40.0f, 0.0f, 1.0f, 0.0f);
glRotatef( 30.0f + drand48()*20.0f, 0.0f, 0.0f, 1.0f);
FractalTree(level + 1, level_seed+6);
glPopMatrix();
glPopMatrix();
}
}
/*
* Create display lists for a leaf, a set of leaves, and a stem
*/
void CreateTreeLists(void)
{
GLUquadricObj *cylquad = gluNewQuadric();
int i;
glNewList(STEM, GL_COMPILE);
glPushMatrix();
glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
gluCylinder(cylquad, 0.1, 0.08, 1, 10, 2 );
glPopMatrix();
glEndList();
glNewList(LEAF, GL_COMPILE); /* I think this was jeff allen's leaf idea */
glBegin(GL_TRIANGLES);
glNormal3f(-0.1f, 0.00f, 0.25f); /* not normalized */
glVertex3f( 0.0f, 0.00f, 0.00f);
glVertex3f(0.25f, 0.25f, 0.10f);
glVertex3f(0.00f, 0.50f, 0.00f);
glNormal3f( 0.10f, 0.00f, 0.25f);
glVertex3f( 0.00f, 0.00f, 0.00f);
glVertex3f( 0.00f, 0.50f, 0.00f);
glVertex3f(-0.25f, 0.25f, 0.10f);
glEnd();
glEndList();
glNewList(STEMANDLEAVES, GL_COMPILE);
glPushMatrix();
glPushAttrib(GL_LIGHTING_BIT);
glCallList(STEM);
glCallList(LEAF_MAT);
for(i = 0; i < 3; i++) {
glTranslatef(0.0f, 0.333f, 0.0f);
glRotatef(90.0f, 0.0f, 1.0f, 0.0f);
glPushMatrix();
glRotatef( 0.0f, 0.0f, 1.0f, 0.0f);
glRotatef(50.0f, 1.0f, 0.0f, 0.0f);
glCallList(LEAF);
glPopMatrix();
glPushMatrix();
glRotatef(180.0f, 0.0f, 1.0f, 0.0f);
glRotatef( 60.0f, 1.0f, 0.0f, 0.0f);
glCallList(LEAF);
glPopMatrix();
}
glPopAttrib();
glPopMatrix();
glEndList();
gluDeleteQuadric(cylquad);
}
/*
* draw and build display list for tree
*/
void CreateTree(void)
{
srand48(TreeSeed);
glNewList(TREE, GL_COMPILE);
glPushMatrix();
glPushAttrib(GL_LIGHTING_BIT);
glCallList(TREE_MAT);
glTranslatef(0, -1, 0);
FractalTree(0, TreeSeed);
glPopAttrib();
glPopMatrix();
glEndList();
}
/*
* new seed for a new tree (groan)
*/
void NewTree(void)
{
TreeSeed = long(time(NULL)); // use time() as random seed
}
/***************************************************************/
/*********************** FRACTAL PLANET ************************/
/***************************************************************/
void CreateIsland(void)
{
cutoff = .06f;
CreateMountain();
cutoff = -1;
glNewList(ISLAND, GL_COMPILE);
glPushAttrib(GL_LIGHTING_BIT);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glCallList(WATER_MAT);
glBegin(GL_QUADS);
glNormal3f( 0.0f, 1.00f, 0.0f);
glVertex3f( 10.0f, 0.01f, 10.0f);
glVertex3f( 10.0f, 0.01f, -10.0f);
glVertex3f(-10.0f, 0.01f, -10.0f);
glVertex3f(-10.0f, 0.01f, 10.0f);
glEnd();
glPushMatrix();
glTranslatef(0.0f, -0.1f, 0.0f);
glCallList(MOUNTAIN);
glPopMatrix();
glPushMatrix();
glRotatef(135.0f, 0.0f, 1.0f, 0.0f);
glTranslatef(0.2f, -0.15f, -0.4f);
glCallList(MOUNTAIN);
glPopMatrix();
glPushMatrix();
glRotatef(-60.0f, 0.0f, 1.0f, 0.0f);
glTranslatef(0.7f, -0.07f, 0.5f);
glCallList(MOUNTAIN);
glPopMatrix();
glPushMatrix();
glRotatef(-175.0f, 0.0f, 1.0f, 0.0f);
glTranslatef(-0.7f, -0.05f, -0.5f);
glCallList(MOUNTAIN);
glPopMatrix();
glPushMatrix();
glRotatef(165.0f, 0.0f, 1.0f, 0.0f);
glTranslatef(-0.9f, -0.12f, 0.0f);
glCallList(MOUNTAIN);
glPopMatrix();
glPopMatrix();
glPopAttrib();
glEndList();
}
void NewFractals(void)
{
NewMountain();
NewTree();
}
void Create(int fract)
{
switch(fract) {
case MOUNTAIN:
CreateMountain();
break;
case TREE:
CreateTree();
break;
case ISLAND:
CreateIsland();
break;
}
}
/***************************************************************/
/**************************** OPENGL ***************************/
/***************************************************************/
void SetupMaterials(void)
{
GLfloat mtn_ambuse[] = { 0.426f, 0.256f, 0.108f, 1.0f };
GLfloat mtn_specular[] = { 0.394f, 0.272f, 0.167f, 1.0f };
GLfloat mtn_shininess[] = { 10.0f };
GLfloat water_ambuse[] = { 0.0f, 0.1f, 0.5f, 1.0f };
GLfloat water_specular[] = { 0.0f, 0.1f, 0.5f, 1.0f };
GLfloat water_shininess[] = { 10.0f };
GLfloat tree_ambuse[] = { 0.4f, 0.25f, 0.1f, 1.0f };
GLfloat tree_specular[] = { 0.0f, 0.00f, 0.0f, 1.0f };
GLfloat tree_shininess[] = { 0.0f };
GLfloat leaf_ambuse[] = { 0.0f, 0.8f, 0.0f, 1.0f };
GLfloat leaf_specular[] = { 0.0f, 0.8f, 0.0f, 1.0f };
GLfloat leaf_shininess[] = { 10.0f };
glNewList(MOUNTAIN_MAT, GL_COMPILE);
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, mtn_ambuse);
glMaterialfv(GL_FRONT, GL_SPECULAR, mtn_specular);
glMaterialfv(GL_FRONT, GL_SHININESS, mtn_shininess);
glEndList();
glNewList(WATER_MAT, GL_COMPILE);
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, water_ambuse);
glMaterialfv(GL_FRONT, GL_SPECULAR, water_specular);
glMaterialfv(GL_FRONT, GL_SHININESS, water_shininess);
glEndList();
glNewList(TREE_MAT, GL_COMPILE);
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, tree_ambuse);
glMaterialfv(GL_FRONT, GL_SPECULAR, tree_specular);
glMaterialfv(GL_FRONT, GL_SHININESS, tree_shininess);
glEndList();
glNewList(LEAF_MAT, GL_COMPILE);
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, leaf_ambuse);
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, leaf_specular);
glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, leaf_shininess);
glEndList();
}
void myGLInit(void)
{
GLfloat light_ambient[] = { 0.0f, 0.0f, 0.0f, 1.0f };
GLfloat light_diffuse[] = { 1.0f, 1.0f, 1.0f, 1.0f };
GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
GLfloat light_position[] = { 0.0f, 0.3f, 0.3f, 0.0f };
GLfloat lmodel_ambient[] = { 0.4f, 0.4f, 0.4f, 1.0f };
glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glDepthFunc(GL_LEQUAL);
glEnable(GL_DEPTH_TEST);
glEnable(GL_NORMALIZE);
#if 0
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
#endif
glShadeModel(GL_SMOOTH);
#if 0
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
#endif
SetupMaterials();
CreateTreeLists();
glFlush();
}
/***************************************************************/
/************************ GLUT STUFF ***************************/
/***************************************************************/
int winwidth = 1;
int winheight = 1;
void reshape(int w, int h)
{
glViewport(0,0,w,h);
winwidth = w;
winheight = h;
}
void display(void)
{
time_t curtime;
char buf[255];
static time_t fpstime = 0;
static int fpscount = 0;
static int fps = 0;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60.0, (GLdouble)winwidth/winheight, 0.01, 100);
agvViewTransform();
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
if (Rebuild) {
Create(fractal);
Rebuild = 0;
}
glCallList(fractal);
if (DrawAxes)
glCallList(AXES);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0.0, winwidth, 0.0, winheight);
sprintf(buf, "FPS=%d", fps);
glColor3f(1.0f, 1.0f, 1.0f);
gl_font(FL_HELVETICA, 12);
gl_draw(buf, 10, 10);
//
// Use glFinish() instead of glFlush() to avoid getting many frames
// ahead of the display (problem with some Linux OpenGL implementations...)
//
glFinish();
// Update frames-per-second
fpscount ++;
curtime = time(NULL);
if ((curtime - fpstime) >= 2)
{
fps = (fps + fpscount / int(curtime - fpstime)) / 2;
fpstime = curtime;
fpscount = 0;
}
}
void visible(int v)
{
if (v == GLUT_VISIBLE)
agvSetAllowIdle(1);
else {
glutIdleFunc(NULL);
agvSetAllowIdle(0);
}
}
void menuuse(int v)
{
if (v == GLUT_MENU_NOT_IN_USE)
agvSetAllowIdle(1);
else {
glutIdleFunc(NULL);
agvSetAllowIdle(0);
}
}
/***************************************************************/
/******************* MENU SETUP & HANDLING *********************/
/***************************************************************/
typedef enum { MENU_QUIT, MENU_RAND, MENU_MOVE, MENU_AXES } MenuChoices;
void setlevel(int value)
{
Level = value;
Rebuild = 1;
glutPostRedisplay();
}
void choosefract(int value)
{
fractal = value;
Rebuild = 1;
glutPostRedisplay();
}
void handlemenu(int value)
{
switch (value) {
case MENU_QUIT:
exit(0);
break;
case MENU_RAND:
NewFractals();
Rebuild = 1;
glutPostRedisplay();
break;
case MENU_AXES:
DrawAxes = !DrawAxes;
glutPostRedisplay();
break;
}
}
void MenuInit(void)
{
int submenu3, submenu2, submenu1;
submenu1 = glutCreateMenu(setlevel);
glutAddMenuEntry((char *)"0", 0); glutAddMenuEntry((char *)"1", 1);
glutAddMenuEntry((char *)"2", 2); glutAddMenuEntry((char *)"3", 3);
glutAddMenuEntry((char *)"4", 4); glutAddMenuEntry((char *)"5", 5);
glutAddMenuEntry((char *)"6", 6); glutAddMenuEntry((char *)"7", 7);
glutAddMenuEntry((char *)"8", 8);
submenu2 = glutCreateMenu(choosefract);
glutAddMenuEntry((char *)"Moutain", MOUNTAIN);
glutAddMenuEntry((char *)"Tree", TREE);
glutAddMenuEntry((char *)"Island", ISLAND);
submenu3 = glutCreateMenu(agvSwitchMoveMode);
glutAddMenuEntry((char *)"Flying", FLYING);
glutAddMenuEntry((char *)"Polar", POLAR);
glutCreateMenu(handlemenu);
glutAddSubMenu((char *)"Level", submenu1);
glutAddSubMenu((char *)"Fractal", submenu2);
glutAddSubMenu((char *)"Movement", submenu3);
glutAddMenuEntry((char *)"New Fractal", MENU_RAND);
glutAddMenuEntry((char *)"Toggle Axes", MENU_AXES);
glutAddMenuEntry((char *)"Quit", MENU_QUIT);
glutAttachMenu(GLUT_RIGHT_BUTTON);
}
/***************************************************************/
/**************************** MAIN *****************************/
/***************************************************************/
// FLTK-style callbacks to Glut menu callback translators:
void setlevel(Fl_Widget*, void *value) {setlevel(fl_intptr_t(value));}
void choosefract(Fl_Widget*, void *value) {choosefract(fl_intptr_t(value));}
void handlemenu(Fl_Widget*, void *value) {handlemenu(fl_intptr_t(value));}
#include <FL/Fl_Button.H>
#include <FL/Fl_Group.H>
#include <FL/Fl_Window.H>
int main(int argc, char** argv)
{
Fl::use_high_res_GL(1);
// glutInit(&argc, argv); // this line removed for FLTK
// create FLTK window:
Fl_Window window(512+20, 512+100);
window.resizable(window);
// create a bunch of buttons:
Fl_Group *g = new Fl_Group(110,50,400-110,30,"Level:");
g->align(FL_ALIGN_LEFT);
g->begin();
Fl_Button *b;
b = new Fl_Button(110,50,30,30,"0"); b->callback(setlevel,(void*)0);
b = new Fl_Button(140,50,30,30,"1"); b->callback(setlevel,(void*)1);
b = new Fl_Button(170,50,30,30,"2"); b->callback(setlevel,(void*)2);
b = new Fl_Button(200,50,30,30,"3"); b->callback(setlevel,(void*)3);
b = new Fl_Button(230,50,30,30,"4"); b->callback(setlevel,(void*)4);
b = new Fl_Button(260,50,30,30,"5"); b->callback(setlevel,(void*)5);
b = new Fl_Button(290,50,30,30,"6"); b->callback(setlevel,(void*)6);
b = new Fl_Button(320,50,30,30,"7"); b->callback(setlevel,(void*)7);
b = new Fl_Button(350,50,30,30,"8"); b->callback(setlevel,(void*)8);
g->end();
b = new Fl_Button(400,50,100,30,"New Fractal"); b->callback(handlemenu,(void*)MENU_RAND);
b = new Fl_Button( 10,10,100,30,"Mountain"); b->callback(choosefract,(void*)MOUNTAIN);
b = new Fl_Button(110,10,100,30,"Tree"); b->callback(choosefract,(void*)TREE);
b = new Fl_Button(210,10,100,30,"Island"); b->callback(choosefract,(void*)ISLAND);
b = new Fl_Button(400,10,100,30,"Quit"); b->callback(handlemenu,(void*)MENU_QUIT);
window.show(argc,argv); // glut will die unless parent window visible
window.begin(); // this will cause Glut window to be a child
glutInitWindowSize(512, 512);
glutInitWindowPosition(10,90); // place it inside parent window
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH | GLUT_MULTISAMPLE);
glutCreateWindow("Fractal Planet?");
window.end();
window.resizable(glut_window);
agvInit(1); /* 1 cause we don't have our own idle */
glutReshapeFunc(reshape);
glutDisplayFunc(display);
glutVisibilityFunc(visible);
glutMenuStateFunc(menuuse);
NewFractals();
agvMakeAxesList(AXES);
myGLInit();
MenuInit();
glutMainLoop(); // you could use Fl::run() instead
return 0;
}
#endif
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