Computergraphik_Hopp/Code/template_meshVisualisierung_projektion_depthBuffer_aa.c

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2018-11-14 15:54:26 +01:00
#include <GL/glut.h>
#include <math.h>
#include <stdio.h>
#define ORTHO 1
#define PERSPECTIVE 2
#pragma warning(disable : 4996)
void mouse(int button, int state, int x, int y);
void key(unsigned char key, int x, int y);
void init(void);
void reshape(int, int);
void display(void);
void define_menu(void);
void idle(void);
void timer(int value);
void readcloud(char* filename);
void mouseactive(int x, int y);
void mouse(int button, int state, int x, int y);
void setProjection(int projType);
void setAntiAliasing(int state);
float cpoints[3 * 60000];
float ccolors[3 * 60000];
int ccoord[10 * 3 * 60000];
int maxcoords = 0;
float cpointsmax[3];
float cpointsmin[3];
int cpoints_n = 0;
static float xoff = 0.0f;
static float yoff = 0.0f;
static double zoff = 0.0;
static float zoom;
static int angle1;
static int angle2;
const float stepsize = 0.05;
const float anglestepsize = 0.01;
int displaymodus = 1;
int pressedbutton = 0;
int startx, starty, startz;
int startangle1;
int startangle2;
float startxoff;
float startyoff;
float startzoff;
int projType = PERSPECTIVE; // default: perspective projection
int antiAliasing = 0;
int main(int argc, char** argv)
{
readcloud("/home/andre/shares/Bachelor/DHBW_AI_16/4303_Computergraphik_Hopp/Code/bones.txt"); // change this in case the point cloud is saved somewhere else.
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); // Doublebuffer for animation
glutInitWindowSize(800, 800);
glutInitWindowPosition(400, 100);
glutCreateWindow("Mesh Visualization");
init();
glutMouseFunc(mouse);
glutMotionFunc(mouseactive);
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutKeyboardFunc(key);
printf("\n\nSTEUERUNG\nAnzeigemodi:\n");
printf("'0' nur Box\n'1' Points, Farbwerte nach Koordinate\n'2' Wireframe, Farbwerte nach Koordinate\n'3' Filled, Farbwerte nach Koordinate\n");
printf("'4' Points, Farbwerte aus Datei\n'5' Wireframe, Farbwerte aus Datei\n'6' Filled, Farbwerte aus Datei\n\n\n");
printf("Transformationen:\n linke Maustaste und x-y-Bewegung -> Rotation\n mittlere Maustaste und y-Richtung -> Zoom (entspricht einer Skalierung)\n");
printf(" rechte Maustaste und x-y-Bewegung -> Translation\n\n");
printf("Projektionsart aendern:\n");
printf("'o' orthographische Projektion, 'p' perspektivische Projektion \n\n");
glutMainLoop();
return 0;
}
void displaycloud(int modus)
{
int i = 0;
float range[3];
for (i = 0; i < 3; i++)
range[i] = cpointsmax[i] - cpointsmin[i];
if (modus > 0) {
if (modus == 1 || modus == 4) { // Display only the vertices
glPolygonMode(GL_FRONT_AND_BACK, GL_POINT);
}
if (modus == 2 || modus == 5) { // Display the outlines of the polygons
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
}
if (modus == 3 || modus == 6) { // Display filled polygons
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
}
glBegin(GL_TRIANGLES); // using the polygone mode "GL_TRIANGLES"
for (i = 0; i < maxcoords + 1; i++) {
if (modus > 3) { // Displaying colors saved in the mesh file (node wise definition!)
glColor3f(ccolors[ccoord[i] * 3], ccolors[ccoord[i] * 3 + 1], ccolors[ccoord[i] * 3 + 2]);
} else { // Displaying interpolated colors according to the x-/y-/z-value of the point coordinates (node wise definition!)
glColor3f((cpoints[ccoord[i] * 3] - cpointsmin[0]) / range[0], (cpoints[ccoord[i] * 3 + 1] - cpointsmin[1]) / range[1], (cpoints[ccoord[i] * 3 + 2] - cpointsmin[2]) / range[2]);
}
glVertex3f(cpoints[ccoord[i] * 3], cpoints[ccoord[i] * 3 + 1], cpoints[ccoord[i] * 3 + 2]);
}
glEnd();
}
}
void display(void)
{
glPushMatrix();
switch (projType) {
case ORTHO:
/////////////////////////////////////////////////////////////////////////
// note: - vertices are initially all in the range between [-1 1].
// - vertices are rotated as given by the user input.
// - use zoff to define the zoom with glOrtho
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-2.0 - zoff, 2.0 + zoff, -2.0 - zoff, 2.0 + zoff, -2.0 - zoff, 2.0 + zoff);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0, 0, 0.01, 0, 0, 0, 0, 1, 0);
/////////////////////////////////////////////////////////////////////////
break;
case PERSPECTIVE:
/////////////////////////////////////////////////////////////////////////
// note: - use gluPerspective here.
// - use zoff to define the zoom with gluLookAt
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0, 1.0, 3, 7); // TODO
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0, 0, 5.0 + zoff, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
/////////////////////////////////////////////////////////////////////////
break;
}
glPushMatrix();
// UEBUNG KAPITEL 6: Depth Buffer
////////////////////////////////////////////////////////////////////////////////////////////////
// TODO:
// - set the default clear value for the depth buffer
// - clear color and depth buffer
// - enable depth testing
// - set depth func
glClearDepth(1);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
//////////////////////////////////////////////////////////////////////////////////////////////
glColor3f(0.0, 0.0, 0.0);
// center and rotate
glTranslatef(xoff, yoff, 0);
glRotatef(angle2, 1.0, 0.0, 0.0);
glRotatef(angle1, 0.0, 1.0, 0.0);
//display
displaycloud(displaymodus);
// draw box
glColor3f(0.0, 0.0, 0.0);
glBegin(GL_LINE_LOOP);
glVertex3f(cpointsmax[0], cpointsmax[1], cpointsmax[2]);
glVertex3f(cpointsmin[0], cpointsmax[1], cpointsmax[2]);
glVertex3f(cpointsmin[0], cpointsmin[1], cpointsmax[2]);
glVertex3f(cpointsmax[0], cpointsmin[1], cpointsmax[2]);
glEnd();
glBegin(GL_LINE_LOOP);
glVertex3f(cpointsmax[0], cpointsmax[1], cpointsmin[2]);
glVertex3f(cpointsmin[0], cpointsmax[1], cpointsmin[2]);
glVertex3f(cpointsmin[0], cpointsmin[1], cpointsmin[2]);
glVertex3f(cpointsmax[0], cpointsmin[1], cpointsmin[2]);
glEnd();
glBegin(GL_LINES);
glVertex3f(cpointsmax[0], cpointsmax[1], cpointsmax[2]);
glVertex3f(cpointsmax[0], cpointsmax[1], cpointsmin[2]);
glVertex3f(cpointsmin[0], cpointsmax[1], cpointsmax[2]);
glVertex3f(cpointsmin[0], cpointsmax[1], cpointsmin[2]);
glVertex3f(cpointsmin[0], cpointsmin[1], cpointsmax[2]);
glVertex3f(cpointsmin[0], cpointsmin[1], cpointsmin[2]);
glVertex3f(cpointsmax[0], cpointsmin[1], cpointsmax[2]);
glVertex3f(cpointsmax[0], cpointsmin[1], cpointsmin[2]);
glEnd();
glPopMatrix();
glPopMatrix();
glutSwapBuffers(); // Buffer for animation needs to be swapped
}
void init(void)
{
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
glHint(GL_POINT_SMOOTH_HINT, GL_NICEST);
glHint(GL_POLYGON_SMOOTH_HINT, GL_NICEST);
glClearColor(0.99f, 0.99f, 0.99f, 0.0);
glLoadIdentity();
xoff = 0.0;
yoff = 0.0;
zoff = 0.0;
zoom = 1;
angle1 = 45;
angle2 = 45;
}
void setAntiAliasing(int state)
{
antiAliasing = state;
/////////////////////////// ENABLE / DISABLE Line/Point/Polygon Antialiasing
//////////////////////////////////////////////////////////////////////////////
}
void reshape(int w, int h)
{
glViewport(0, 0, w, h);
glClear(GL_COLOR_BUFFER_BIT);
}
void idle()
{
}
void timer(int value)
{
}
void readcloud(char* filename)
{
int i = 0;
int j = 0;
FILE* f;
int abbruch = 0;
char str[200] = "";
float temp;
printf("Lese '%s' ein\n", filename);
f = fopen(filename, "r");
if (!f) {
return;
}
printf("Ueberspringe Kopf...\n");
// Kopf Überspringen
int k = 0;
while (!feof(f) && str[0] != '[' && k <= 200){
fscanf(f, "%s", str);
++k;
}
printf("Lese Punkte ein...\n");
//Punkte einlesen
while (!feof(f) && abbruch == 0) {
//einlesen
if (((i + 1) % 3) == 0)
fscanf(f, "%f %c", &cpoints[i], str);
else
fscanf(f, "%f", &cpoints[i]);
// Extremalwerte initialisieren
if (i < 3) {
cpointsmax[i % 3] = cpoints[i];
cpointsmin[i % 3] = cpoints[i];
}
//Abbruch, wenn alle Punkte 0 sind, (nicht ganz sauber, aber funktioniert, wenn nicht zufällig der Urspung ein gültiger Punkt ist)
if (i > 3 && cpoints[i - 2] == 0 && cpoints[i - 1] == 0 && cpoints[i] == 0)
abbruch = 1;
//Extremalwerte gegebenenfalls erneuern
if (cpoints[i] > cpointsmax[i % 3] && cpoints[i] != 0)
cpointsmax[i % 3] = cpoints[i];
if (cpoints[i] < cpointsmin[i % 3] && cpoints[i] != 0)
cpointsmin[i % 3] = cpoints[i];
i++;
}
cpoints_n = i - 1;
printf("Es wurden %i Vertices gelesen\n", cpoints_n / 3);
printf("Koordinaten sind in den Intervallen [%f,%f] [%f,%f] [%f,%f]\n\n", cpointsmin[0], cpointsmax[0], cpointsmin[1], cpointsmax[1], cpointsmin[2], cpointsmax[2]);
abbruch = 0;
i = 0;
//warten, bis es zu den colors geht
while (!feof(f) && str[0] != '[')
fscanf(f, "%s", str);
printf("Lese Farben ein...\n");
// Farben einlesen
while (!feof(f) && abbruch == 0) {
//einlesen
if (((i + 1) % 3) == 0)
fscanf(f, "%f %c", &ccolors[i], str);
else
fscanf(f, "%f", &ccolors[i]);
//Abbruch, wenn alle farben 0 sind, (nicht ganz sauber, aber funktioniert, wenn nicht zufällig schwarz eine gültige Farbe ist)
if (i > 3 && ccolors[i - 2] == 0 && ccolors[i - 1] == 0 && ccolors[i] == 0)
abbruch = 1;
i++;
}
printf("Es wurden %i Farben eingelesen\n\n", (i - 1) / 3);
abbruch = 0;
i = 0;
//warten, bis es zu den koordinaten geht
while (!feof(f) && str[0] != '[')
fscanf(f, "%s", str);
printf("Lese Koordinaten fuer die Dreiecke ein...\n");
// Koordinaten einlesen
while (!feof(f) && abbruch < 2) {
//einlesen
fscanf(f, "%i %c", &ccoord[i], str);
//printf("%i\n",ccoord[i]);
//Abbruch, wenn alle Dreiecke 0 sind, (nicht ganz sauber, aber funktioniert, wenn nicht zufällig der Urspung ein gültiger Punkt ist)
if (ccoord[i] == -1) {
i--;
abbruch++;
} else
abbruch = 0;
i++;
}
maxcoords = i - 1;
printf("Es wurden %i Dreiecke eingelesen\n", (maxcoords + 1) / 3); // drei Punkte bilden ein Dreieck
fclose(f);
printf("Einlesen beendet\n\n");
for (j = 0; j < cpoints_n; j++) {
// normalize
cpoints[j] = cpoints[j] - cpointsmin[j % 3];
cpoints[j] = 2 * cpoints[j] / (cpointsmax[j % 3] - cpointsmin[j % 3]);
cpoints[j] = cpoints[j] - 1;
}
cpointsmin[0] = -1;
cpointsmin[1] = -1;
cpointsmin[2] = -1;
cpointsmax[0] = 1;
cpointsmax[1] = 1;
cpointsmax[2] = 1;
for (j = 0; j < cpoints_n; j++) {
if (j % 3 == 1) { // y-coordinate change with z-coordinate
temp = cpoints[j];
cpoints[j] = cpoints[j + 1];
cpoints[j + 1] = temp;
}
}
}
void key(unsigned char k, int x, int y);
void mouseactive(int x, int y)
{
if (pressedbutton == GLUT_LEFT_BUTTON) {
angle1 = startangle1 + (x - startx) / 10;
angle2 = startangle2 + (y - starty) / 10;
}
if (pressedbutton == GLUT_RIGHT_BUTTON) {
xoff = startxoff + (float)(x - startx) / 100;
yoff = startyoff + (float)(y - starty) / 100;
}
if (pressedbutton == GLUT_MIDDLE_BUTTON) {
zoff = startzoff + ((float)(y - startz) / 100);
}
glutPostRedisplay();
}
void mouse(int button, int state, int x, int y)
{
if (state == GLUT_DOWN) {
pressedbutton = button;
startx = x;
starty = y;
startz = y;
startangle1 = angle1;
startangle2 = angle2;
startxoff = xoff;
startyoff = yoff;
startzoff = zoff;
} else
pressedbutton = 0;
}
void MainMenu(int value)
{
switch (value) {
case 2:
key('q', 0, 0);
break;
}
}
void submenu1(int value)
{
}
void define_menu()
{
}
void key(unsigned char k, int x, int y)
{
switch (k) {
case 8: //BACKSPACE
init();
break;
case 27:
case 'q':
case 'Q':
exit(0);
case 'o':
projType = ORTHO;
printf("Projektion: ORTHOGRAPHIC\n");
glutPostRedisplay();
break;
case 'p':
projType = PERSPECTIVE;
printf("Projektion: PERSPECTIVE\n");
glutPostRedisplay();
break;
case 'a':
if (antiAliasing == 1) {
setAntiAliasing(0);
printf("Antialiasing disabled\n");
} else {
setAntiAliasing(1);
printf("Antialiasing enabled\n");
}
break;
default:
if (k > '0' - 1 && k < '7') {
displaymodus = k - '0';
printf("Display-Modus: %i\n", displaymodus);
} else {
printf("Taste %c mit Steuerzeichen %i nicht belegt\n", k, k);
}
break;
}
glutPostRedisplay();
}