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glfem.c
executable file
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glfem.c
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/*
* glfem.c
* Library for MECA1120 : Finite Elements for dummies
*
* Copyright (C) 2012 UCL-IMMC : Vincent Legat
* All rights reserved.
*
*/
#include "glfem.h"
void glMakeRasterFont(void);
void getColor(double value, int numberOfColors, float* R, float* G, float* B);
double glScale(double minimum, double maximum, double value);
static int gRasterH = 800;
static int gRasterV = 600;
static int numberColors = 50;
GLubyte space[] =
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
GLubyte letters[][13] = {
{0x00, 0x00, 0xc3, 0xc3, 0xc3, 0xc3, 0xff, 0xc3, 0xc3, 0xc3, 0x66, 0x3c, 0x18}, // A
{0x00, 0x00, 0xfe, 0xc7, 0xc3, 0xc3, 0xc7, 0xfe, 0xc7, 0xc3, 0xc3, 0xc7, 0xfe}, // B
{0x00, 0x00, 0x7e, 0xe7, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xe7, 0x7e}, // C
{0x00, 0x00, 0xfc, 0xce, 0xc7, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc7, 0xce, 0xfc}, // D
{0x00, 0x00, 0xff, 0xc0, 0xc0, 0xc0, 0xc0, 0xfc, 0xc0, 0xc0, 0xc0, 0xc0, 0xff}, // E
{0x00, 0x00, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xfc, 0xc0, 0xc0, 0xc0, 0xff}, // F
{0x00, 0x00, 0x7e, 0xe7, 0xc3, 0xc3, 0xcf, 0xc0, 0xc0, 0xc0, 0xc0, 0xe7, 0x7e}, // G
{0x00, 0x00, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xff, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3}, // H
{0x00, 0x00, 0x7e, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x7e}, // I
{0x00, 0x00, 0x7c, 0xee, 0xc6, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06}, // J
{0x00, 0x00, 0xc3, 0xc6, 0xcc, 0xd8, 0xf0, 0xe0, 0xf0, 0xd8, 0xcc, 0xc6, 0xc3}, // K
{0x00, 0x00, 0xff, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0}, // L
{0x00, 0x00, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xdb, 0xff, 0xff, 0xe7, 0xc3}, // M
{0x00, 0x00, 0xc7, 0xc7, 0xcf, 0xcf, 0xdf, 0xdb, 0xfb, 0xf3, 0xf3, 0xe3, 0xe3}, // N
{0x00, 0x00, 0x7e, 0xe7, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xe7, 0x7e}, // O
{0x00, 0x00, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xfe, 0xc7, 0xc3, 0xc3, 0xc7, 0xfe}, // P
{0x00, 0x00, 0x3f, 0x6e, 0xdf, 0xdb, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0x66, 0x3c}, // Q
{0x00, 0x00, 0xc3, 0xc6, 0xcc, 0xd8, 0xf0, 0xfe, 0xc7, 0xc3, 0xc3, 0xc7, 0xfe}, // R
{0x00, 0x00, 0x7e, 0xe7, 0x03, 0x03, 0x07, 0x7e, 0xe0, 0xc0, 0xc0, 0xe7, 0x7e}, // S
{0x00, 0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0xff}, // T
{0x00, 0x00, 0x7e, 0xe7, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3}, // U
{0x00, 0x00, 0x18, 0x3c, 0x3c, 0x66, 0x66, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3}, // V
{0x00, 0x00, 0xc3, 0xe7, 0xff, 0xff, 0xdb, 0xdb, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3}, // W
{0x00, 0x00, 0xc3, 0x66, 0x66, 0x3c, 0x3c, 0x18, 0x3c, 0x3c, 0x66, 0x66, 0xc3}, // X
{0x00, 0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3c, 0x3c, 0x66, 0x66, 0xc3}, // Y
{0x00, 0x00, 0xff, 0xc0, 0xc0, 0x60, 0x30, 0x7e, 0x0c, 0x06, 0x03, 0x03, 0xff} // Z
};
GLubyte lowletters[][13] = {
{0x00, 0x00, 0x7d, 0xc3, 0xc3, 0xc3, 0x7f, 0x03, 0x7e, 0x00, 0x00, 0x00, 0x00}, // a
{0x00, 0x00, 0xfe, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xfe, 0xc0, 0xc0, 0xc0, 0xc0}, // b
{0x00, 0x00, 0x7f, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0x7f, 0x00, 0x00, 0x00, 0x00}, // c
{0x00, 0x00, 0x7f, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0x7f, 0x03, 0x03, 0x03, 0x03}, // d
{0x00, 0x00, 0x7e, 0xc0, 0xc0, 0xfe, 0xc3, 0xc3, 0x7e, 0x00, 0x00, 0x00, 0x00}, // e
{0x00, 0x00, 0x3c, 0x18, 0x18, 0x18, 0x18, 0x18, 0x7e, 0x18, 0x18, 0x18, 0x0e}, // f
{0x7f, 0x03, 0x7f, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0x7e, 0x00, 0x00, 0x00, 0x00}, // g
{0x00, 0x00, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xfe, 0xc0, 0xc0, 0xc0, 0xc0}, // h
{0x00, 0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x00}, // i
{0x70, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x00}, // j
{0x00, 0x00, 0xc3, 0xc7, 0xce, 0xfc, 0xfe, 0xc7, 0xc3, 0xc0, 0xc0, 0xc0, 0xc0}, // k
{0x00, 0x00, 0x0c, 0x1c, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18}, // l
{0x00, 0x00, 0xdb, 0xdb, 0xdb, 0xdb, 0xdb, 0xdb, 0xfe, 0x00, 0x00, 0x00, 0x00}, // m
{0x00, 0x00, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xfe, 0x00, 0x00, 0x00, 0x00}, // n
{0x00, 0x00, 0x7e, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0x7e, 0x00, 0x00, 0x00, 0x00}, // o
{0xc0, 0xc0, 0xfe, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xfe, 0x00, 0x00, 0x00, 0x00}, // p
{0x03, 0x03, 0x7f, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0x7f, 0x00, 0x00, 0x00, 0x00}, // q
{0x00, 0x00, 0xc0, 0xc0, 0xc0, 0xc0, 0xe0, 0xf0, 0xdf, 0x00, 0x00, 0x00, 0x00}, // r
{0x00, 0x00, 0xfe, 0x03, 0x03, 0x7e, 0xc0, 0xc0, 0x7f, 0x00, 0x00, 0x00, 0x00}, // s
{0x00, 0x00, 0x0e, 0x18, 0x18, 0x18, 0x18, 0x18, 0x7e, 0x18, 0x18, 0x18, 0x18}, // t
{0x00, 0x00, 0x7f, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0x00, 0x00, 0x00, 0x00}, // u
{0x00, 0x00, 0x18, 0x3c, 0x66, 0x66, 0xc3, 0xc3, 0xc3, 0x00, 0x00, 0x00, 0x00}, // v
{0x00, 0x00, 0x66, 0x7e, 0xdb, 0xdb, 0xdb, 0xdb, 0xdb, 0x00, 0x00, 0x00, 0x00}, // w
{0x00, 0x00, 0xc3, 0xe7, 0x3c, 0x18, 0x3c, 0xe7, 0xc3, 0x00, 0x00, 0x00, 0x00}, // x
{0x7f, 0x03, 0x7f, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0x00, 0x00, 0x00, 0x00}, // y
{0x00, 0x00, 0xff, 0xc0, 0x70, 0x1c, 0x06, 0x03, 0xff, 0x00, 0x00, 0x00, 0x00}, // z
};
GLubyte numletters[][13] = {
{0x00, 0x00, 0x3c, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x3c}, // 0
{0x00, 0x00, 0x3c, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x78, 0x38, 0x18}, // 1
{0x00, 0x00, 0x7e, 0x60, 0x60, 0x60, 0x60, 0x3c, 0x06, 0x06, 0x66, 0x66, 0x3c}, // 2
{0x00, 0x00, 0x3c, 0x66, 0x06, 0x06, 0x06, 0x1c, 0x06, 0x06, 0x06, 0x66, 0x3c}, // 3
{0x00, 0x00, 0x06, 0x06, 0x06, 0x06, 0x06, 0x7f, 0x66, 0x36, 0x1e, 0x0e, 0x06}, // 4
{0x00, 0x00, 0x3c, 0x66, 0x06, 0x06, 0x06, 0x7c, 0x60, 0x60, 0x60, 0x60, 0x7e}, // 5
{0x00, 0x00, 0x3c, 0x66, 0x66, 0x66, 0x66, 0x66, 0x7c, 0x60, 0x60, 0x66, 0x3c}, // 6
{0x00, 0x00, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x1f, 0x06, 0x06, 0x06, 0x06, 0x7e}, // 7
{0x00, 0x00, 0x3c, 0x66, 0x66, 0x66, 0x66, 0x3c, 0x66, 0x66, 0x66, 0x66, 0x3c}, // 8
{0x00, 0x00, 0x3c, 0x66, 0x06, 0x06, 0x06, 0x3e, 0x66, 0x66, 0x66, 0x66, 0x3c}, // 9
{0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00}, // :
{0x00, 0x00, 0x30, 0x18, 0x18, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00}, // ;
{0x00, 0x00, 0x06, 0x1c, 0x30, 0x60, 0x30, 0x1c, 0x06, 0x00, 0x00, 0x00, 0x00}, // <
{0x00, 0x00, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x00}, // =
{0x00, 0x00, 0x60, 0x38, 0x0c, 0x06, 0x0c, 0x38, 0x60, 0x00, 0x00, 0x00, 0x00}, // >
{0x00, 0x00, 0x18, 0x18, 0x00, 0x18, 0x18, 0x18, 0x0c, 0x06, 0x06, 0x66, 0x3c}, // ?
};
GLubyte specialletters[][13] = {
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // space
{0x00, 0x00, 0x18, 0x18, 0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18}, // !
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x24, 0x24, 0x00, 0x00}, // "
{0x00, 0x00, 0x24, 0x24, 0x7e, 0x7e, 0x24, 0x7e, 0x7e, 0x24, 0x24, 0x00, 0x00}, // #
{0x00, 0x00, 0x18, 0x3c, 0x5a, 0x5a, 0x1a, 0x3c, 0x58, 0x58, 0x5a, 0x3c, 0x18}, // $
{0x00, 0x00, 0x44, 0x4a, 0x6a, 0x24, 0x30, 0x18, 0x0c, 0x24, 0x56, 0x52, 0x22}, // %
{0x00, 0x00, 0x79, 0xcf, 0xc6, 0xcf, 0x79, 0x70, 0x78, 0xcc, 0xcc, 0xcc, 0x78}, // &
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x08, 0x18, 0x00, 0x00}, // '
{0x00, 0x00, 0x0c, 0x18, 0x18, 0x30, 0x30, 0x30, 0x30, 0x30, 0x18, 0x18, 0x0c}, // (
{0x00, 0x00, 0x30, 0x18, 0x18, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x18, 0x18, 0x30}, // )
{0x00, 0x00, 0x00, 0x00, 0x10, 0x54, 0x38, 0x54, 0x10, 0x00, 0x00, 0x00, 0x00}, // *
{0x00, 0x00, 0x00, 0x00, 0x10, 0x10, 0x7c, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00}, // +
{0x00, 0x30, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // ,
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // -
{0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // .
{0x00, 0x00, 0x60, 0x60, 0x30, 0x30, 0x18, 0x18, 0x18, 0x0c, 0x0c, 0x06, 0x06}, // /
};
GLuint fontOffset;
void glMakeRasterFont(void)
{
GLuint i, j;
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glShadeModel (GL_FLAT);
fontOffset = glGenLists (128);
for (i = 0,j = 'A'; i < 26; i++,j++) {
glNewList(fontOffset + j, GL_COMPILE);
glBitmap(8, 13, 0.0, 2.0, 10.0, 0.0, letters[i]);
glEndList(); }
for (i = 0,j = 'a'; i < 26; i++,j++) {
glNewList(fontOffset + j, GL_COMPILE);
glBitmap(8, 13, 0.0, 2.0, 10.0, 0.0, lowletters[i]);
glEndList(); }
for (i = 0,j = '0'; i < 16; i++,j++) {
glNewList(fontOffset + j, GL_COMPILE);
glBitmap(8, 13, 0.0, 2.0, 10.0, 0.0, numletters[i]);
glEndList(); }
for (i = 0,j = ' '; i < 16; i++,j++) {
glNewList(fontOffset + j, GL_COMPILE);
glBitmap(8, 13, 0.0, 2.0, 10.0, 0.0, specialletters[i]);
glEndList(); }
glShadeModel (GL_SMOOTH);
}
void glfemSetRasterSize(int h, int v)
{
gRasterH = h;
gRasterV = v;
}
void glfemDrawMessage(int h, int v, char *s)
{
// Les coordonnées négatives sont normalement admises :-)
// On conserve le strint entier même si le début est off-screen
int off;
glPushAttrib(GL_ALL_ATTRIB_BITS);
glDisable(GL_TEXTURE_2D);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glOrtho (0.0, gRasterH, gRasterV, 0.0, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
if (h < 0) h = gRasterH + h - strlen(s)*10;
if (v < 0) v = gRasterV + v;
glRasterPos2i(h, v);
glListBase(fontOffset);
if (h >= 0) {
glRasterPos2i(h, v);
glCallLists((GLsizei) strlen(s), GL_UNSIGNED_BYTE, (GLubyte *) s); }
else {
off = (h-9)/10;
glRasterPos2i(h - off*10, v);
if (strlen(s)+off > 0) glCallLists((GLsizei) strlen(s)+off, GL_UNSIGNED_BYTE, (GLubyte *) &s[-off]); }
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopAttrib ();
}
void getColor(double value, int numberOfColors, float* r, float* g, float* b)
{
if (value > 1) value = 1;
value = value * (numberOfColors);
value = (int)(value - 0.00000001);
value = value / (numberOfColors - 1);
value = 1 - value;
if (value < 0) value=0;
if (value > 1) value=1;
*r = 3.5*(1-value)*(1-value);
*g = (1-value)*(value)*3.5;
*b = value*value;
}
double glScale(double minimum, double maximum, double value)
{
if (value < minimum) return 0;
if (minimum == maximum) return minimum;
return (value - minimum) / fabs(maximum - minimum);
}
void glfemDrawNodes(double* x, double* y,int n)
{
int i;
glEnable(GL_POINT_SMOOTH);
glPointSize(10.0);
glBegin(GL_POINTS);
for (i = 0; i < n; i++) {
glVertex2f(x[i],y[i]); }
glEnd();
}
void glfemDrawColorElement(float *x, float *y, double *u, int n)
{
GLfloat r,g,b;
int j;
glBegin(GL_POLYGON);
for (j=0; j < n; ++j) {
getColor(u[j],numberColors,&r,&g,&b);
glColor3f(r,g,b);
glVertex2f(x[j],y[j]);}
glEnd();
}
void glfemDrawElement(float *x, float *y, int n)
{
int j;
glBegin(GL_LINE_STRIP);
for (j = 0; j < n; j++) {
glVertex2f(x[j],y[j]); }
glVertex2f(x[0],y[0]);
glEnd();
}
void glfemMatrix(double **A, int n, int w, int h)
{
double sizeX = (n-1)*40/1.7;
double meanX = (n-1)*20;
double sizeY = (n-1)*40/1.7;
double meanY = (n-1)*20;
double ratio = (GLfloat) h / (GLfloat) w;
double size = fmax(sizeX,sizeY);
double left,right,top,bottom;
if (ratio > 1.0) {
left = meanX - size;
right = meanX + size;
bottom = meanY - size*ratio;
top = meanY + size*ratio; }
else {
left = meanX - size/ratio;
right = meanX + size/ratio;
bottom = meanY - size;
top = meanY + size; }
glViewport(0,0,w,h);
glClearColor( 0.9f, 0.9f, 0.8f, 0.0f );
// glClearColor( 1.0f, 1.0f, 1.0f, 0.0f ); // for white plot
glClear(GL_COLOR_BUFFER_BIT);
glViewport(0, 0, (GLsizei) w, (GLsizei) h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(left, right, bottom, top, -5.0, 5.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
int i,j;
glEnable(GL_POINT_SMOOTH);
double pointSize = fmin(w,h)/(n-1) * 0.5;
glPointSize(pointSize);
glBegin(GL_POINTS);
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
if (fabs(A[i][j]) >= 1e-6) glVertex2f(i*40.0,(n-j-1)*40.0); }}
glEnd();
}
void glfemPlotSolver(femSolver *mySolver, int n, int w, int h)
{
double sizeX = (n-1)*40/1.7;
double meanX = (n-1)*20;
double sizeY = (n-1)*40/1.7;
double meanY = (n-1)*20;
double ratio = (GLfloat) h / (GLfloat) w;
double size = fmax(sizeX,sizeY);
double left,right,top,bottom;
if (ratio > 1.0) {
left = meanX - size;
right = meanX + size;
bottom = meanY - size*ratio;
top = meanY + size*ratio; }
else {
left = meanX - size/ratio;
right = meanX + size/ratio;
bottom = meanY - size;
top = meanY + size; }
glViewport(0,0,w,h);
glClearColor( 0.9f, 0.9f, 0.8f, 0.0f );
// glClearColor( 1.0f, 1.0f, 1.0f, 0.0f ); // for white plot
glClear(GL_COLOR_BUFFER_BIT);
glViewport(0, 0, (GLsizei) w, (GLsizei) h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(left, right, bottom, top, -5.0, 5.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
int i,j;
glEnable(GL_POINT_SMOOTH);
double pointSize = fmin(w,h)/(n-1) * 0.5;
glPointSize(pointSize);
glBegin(GL_POINTS);
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
double value = femSolverGet(mySolver,j,i);
if (fabs(value) >= 1e-6) glVertex2f(i*40.0,(n-j-1)*40.0); }}
glEnd();
}
void glfemReshapeWindows(femMesh *theMesh, int w, int h)
{
double minX = femMin(theMesh->X,theMesh->nNode);
double maxX = femMax(theMesh->X,theMesh->nNode);
double minY = femMin(theMesh->Y,theMesh->nNode);
double maxY = femMax(theMesh->Y,theMesh->nNode);
double sizeX = (maxX-minX)/1.65;
double meanX = (maxX+minX)/2.0;
double sizeY = (maxY-minY)/1.65;
double meanY = (maxY+minY)/2.0;
double ratio = (GLfloat) h / (GLfloat) w;
double size = fmax(sizeX,sizeY);
double left,right,top,bottom;
if (ratio > 1.0) {
left = meanX - size;
right = meanX + size;
bottom = meanY - size*ratio;
top = meanY + size*ratio; }
else {
left = meanX - size/ratio;
right = meanX + size/ratio;
bottom = meanY - size;
top = meanY + size; }
glViewport(0,0,w,h);
glClearColor( 0.9f, 0.9f, 0.8f, 0.0f );
// glClearColor( 1.0f, 1.0f, 1.0f, 0.0f ); // for white plot
glClear(GL_COLOR_BUFFER_BIT);
glViewport(0, 0, (GLsizei) w, (GLsizei) h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(left, right, bottom, top, -5.0, 5.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void glfemPlotField(femMesh *theMesh, double *u)
{
int i,j,*nodes;
float xLoc[4];
float yLoc[4];
double uLoc[4];
double uMax = femMax(u,theMesh->nNode);
double uMin = femMin(u,theMesh->nNode);
int nLocalNode = theMesh->nLocalNode;
for (i = 0; i < theMesh->nElem; ++i) {
nodes = &(theMesh->elem[i*nLocalNode]);
for (j=0; j < nLocalNode; ++j) {
xLoc[j] = theMesh->X[nodes[j]];
yLoc[j] = theMesh->Y[nodes[j]];
uLoc[j] = glScale(uMin,uMax,u[nodes[j]]); }
glfemDrawColorElement(xLoc,yLoc,uLoc,nLocalNode); }
glColor3f(0.0, 0.0, 0.0);
glfemPlotMesh(theMesh);
}
void glfemPlotMesh(femMesh *theMesh)
{
int i,j,*nodes;
float xLoc[4];
float yLoc[4];
int nLocalNode = theMesh->nLocalNode;
for (i = 0; i < theMesh->nElem; ++i) {
nodes = &(theMesh->elem[i*nLocalNode]);
for (j=0; j < nLocalNode; ++j) {
xLoc[j] = theMesh->X[nodes[j]];
yLoc[j] = theMesh->Y[nodes[j]]; }
glfemDrawElement(xLoc,yLoc,nLocalNode); }
}
void glfemMessage(char *message)
{
glColor3f (0.0, 0.0, 0.0);
glfemDrawMessage(20,460,message);
}
GLFWwindow* glfemInit(char *theWindowName)
{
glfwInit();
GLFWwindow* window = glfwCreateWindow(480,480,"Simple example with graphics",NULL,NULL);
glfwMakeContextCurrent(window);
glfemSetRasterSize(480,480);
glfwSetWindowTitle(window,theWindowName);
glShadeModel(GL_SMOOTH);
glMakeRasterFont();
return(window);
}
void glfemPlotEdges(femEdges *theEdges)
{
int i;
femMesh* theMesh = theEdges->mesh;
glBegin(GL_LINES);
for (i = 0; i < theEdges->nEdge; i++) {
glVertex2d(theMesh->X[theEdges->edges[i].node[0]], theMesh->Y[theEdges->edges[i].node[0]]);
glVertex2d(theMesh->X[theEdges->edges[i].node[1]], theMesh->Y[theEdges->edges[i].node[1]]); }
glEnd();
}
void glfemPlotBnd(femEdges *theEdges)
{
int i;
femMesh* theMesh = theEdges->mesh;
glBegin(GL_LINES);
for (i = 0; i < theEdges->nEdge; i++) {
if (theEdges->edges[i].elem[1] < 0) {
glVertex2d(theMesh->X[theEdges->edges[i].node[0]], theMesh->Y[theEdges->edges[i].node[0]]);
glVertex2d(theMesh->X[theEdges->edges[i].node[1]], theMesh->Y[theEdges->edges[i].node[1]]); }}
glEnd();
}