c++openglglutopengl-compat
Animate cube inside an animation
Here i display a cube in different places each period, but i wanted it to be spawned with a transition and animation, for example i want it be translated from -1 to +1 as a loop (animation the cube)
#include <windows.h>
#include <GL/glut.h>
#include <math.h>
#ifdef __APPLE__
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif
#include <stdio.h>
#include <stdlib.h>
float angle_Rotation = 0;
float angle_Rotation2 = 0;
float xx=0.5;
float yy=0.5;
float zz=0.5;
int dx=0;
int dy=1;
int dz=0;
float tabPos[3] = {-4.0,0.0,4.0};
int cpt=0;
GLint rings = 50;
GLint side =50;
GLdouble inner = 0.5;
GLdouble outter = 1;
void init(){
/* choisir la couleur d'effacement */
glClearColor(0.0,0.0,0.0,0.0);
/* Projection et positionement de la camera*/
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(90,1,0.1,100);
gluLookAt(0,10,8,0,0,0,0,1,0);
}
static void Reshape(int width, int height){
glViewport(0,0,width,height);
}
void whatINeed(){
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
//glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
glRotatef(angle_Rotation, 0.0, 1.0, 0);
glRotatef(angle_Rotation2, 1.0, 0.0, 0);
}
static void cercle(float r){
float i;
float PI=3.14;
glBegin(GL_POLYGON);
for(i=0;i<2*PI;i+=PI/48){
glVertex3f(cos(i)*r,sin(i)*r,0.0);
glVertex3f(cos(i)*r,sin(i)*r,6.0);
}
glEnd();
//glFlush();
}
static void KeyPressed(unsigned char touche, int x, int y){
switch (touche)
{
case 'q': ///rotaion � gauche
angle_Rotation = angle_Rotation + 2;
break;
case 'd': ///rotaion � droite
angle_Rotation = angle_Rotation - 2;
break;
case 'z': ///rotaion � gauche
angle_Rotation2 = angle_Rotation2 + 2;
break;
case 's': ///rotaion � droite
angle_Rotation2 = angle_Rotation2 - 2;
break;
}
glutPostRedisplay();
}
void light(void){
glEnable(GL_LIGHTING);
//glEnable(GL_COLOR_MATERIAL);
GLfloat light_couleur1[] = {0.7,0.5,0.6,0.7};
GLfloat light_couleur2[] = {0.7,0.7,0.5,0.7};
//GLfloat light_couleur3[] = {0.7,0.3,1.0,1.0};
//GLfloat light_position[] = {0.0,1.0,0.5,0.5};
GLfloat light_position2[] = {0.0,1.0,0.5,0.0};
GLfloat obj_shine[] = {50.0};
glLightfv(GL_LIGHT1,GL_POSITION,light_position2);
glLightfv(GL_LIGHT1,GL_AMBIENT,light_couleur1);
glLightfv(GL_LIGHT1,GL_DIFFUSE,light_couleur2);
//glLightfv(GL_LIGHT4,GL_SPECULAR,light_couleur2);
//glMaterialfv(GL_FRONT,GL_DIFFUSE,light_couleur2);
glMaterialfv(GL_FRONT,GL_SPECULAR,light_couleur2);
//glMaterialfv(GL_FRONT,GL_SHININESS,obj_shine);
glEnable(GL_LIGHT1);
}
void table(void){
glColor3f(0.6,0.0,0.6);
glPushMatrix(); // Cube
glTranslatef(0,0,0.0);
glScalef(4,1,4); // Scale Sur X et Z (Réctangle)
glutSolidCube(3);
glPopMatrix();
glColor3f(0.3,0.0,0.8);
glPushMatrix(); // Sphere
glTranslatef(-4,1.2,-4); // Ligne Haut Gauche
glRotatef(90,1,0,0);
glutSolidTorus(inner,outter,side,rings);
glPopMatrix();
glPushMatrix();
glTranslatef(0,1.2,-4); // Ligne haut Milieu
glRotatef(90,1,0,0);
glutSolidTorus(inner,outter,side,rings);
glPopMatrix();
glPushMatrix();
glTranslatef(4,1.2,-4); // Ligne haut droite
glRotatef(90,1,0,0);
glutSolidTorus(inner,outter,side,rings);
glPopMatrix();
glPushMatrix();
glTranslatef(-4,1.2,0); // Ligne Milieu droite
glRotatef(90,1,0,0);
glutSolidTorus(inner,outter,side,rings);
glPopMatrix();
glPushMatrix();
glTranslatef(0,1.2,0); // Ligne Milieu Milieu
glRotatef(90,1,0,0);
glutSolidTorus(inner,outter,side,rings);
glPopMatrix();
glPushMatrix();
glTranslatef(4,1.2,0); // Ligne Milieu Gauche
glRotatef(90,1,0,0);
glutSolidTorus(inner,outter,side,rings);
glPopMatrix();
glPushMatrix();
glTranslatef(-4,1.2,4); // Ligne Bas droite
glRotatef(90,1,0,0);
glutSolidTorus(inner,outter,side,rings);
glPopMatrix();
glPushMatrix();
glTranslatef(0,1.2,4); // Ligne Bas milieu
glRotatef(90,1,0,0);
glutSolidTorus(inner,outter,side,rings);
glPopMatrix();
glPushMatrix();
glTranslatef(4,1.2,4); // Ligne Bas gauche
glRotatef(90,1,0,0);
glutSolidTorus(inner,outter,side,rings);
glPopMatrix();
}
void taupe(void){
glPushMatrix();
glTranslatef(tabPos[dx],dy,tabPos[dz]); // Ligne Milieu droite
glColor3f(0.8,0.3,0.5);
glutSolidCube(2);
glPopMatrix();
}
in this function spawn, i have to update dy i've to make it from -1 to 1 with 0.05 as a step the problem is when i add the code i lose my primary animation
void spawn(void){
if(cpt%500000==0){
if(cpt>500000){
cpt=0;
}
dx = rand() % 3; //generates a ra
ndom number between 0 and 2 dz = rand() % 3; //generates a random number between 0 and 3
glutPostRedisplay();
}
cpt++;
}
void display(){
whatINeed();
table();
taupe();
glutSwapBuffers();
}
int main(){
// Considérer la profondeur
glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA);
/* Initialisationd e glut et création de la fenetre */
glutInitWindowSize(720,720);
glutInitWindowPosition(100,100);
glutCreateWindow("OpenGL TP");
/*Autre Initialisation */
init();
/*enregistrement des fonction rappel*/
glutDisplayFunc(display);
glutReshapeFunc(Reshape);
glutKeyboardFunc(KeyPressed);
here i spawn the cube as animation
glutIdleFunc(spawn);
glEnable(GL_DEPTH_TEST);
//light();
/* entré dans mla boucle principal de glut*/
glutMainLoop();
return 0;
}
Solution
To make an animation, you have to continuously update the display. Remove all calls to glutPostRedisplay and do a single call in display. e.g.:
void display(){
whatINeed();
table();
taupe();
glutSwapBuffers();
glutPostRedisplay(); // <---
}
To animate between 2 positions, you have to know the previous (pdx) and new position (dx):
int pdx=0;
int dx=0;
Define a time interval for the animation. Use a timer (glutTimerFunc) instead of glutIdleFunc to start a new animation:
int interval = 1000; // 1 second
void spawntimer(int value);
int main()
{
// [...]
// glutIdleFunc(spawn); <--- DELETE
glutTimerFunc(interval, spawntimer, 0); // <--- ADD
// [...]
In spawntimer store the current position to dx and get ane random position. Store the current elapsed time to start_time. This states the start time of the animation and can be get by glutGet(GLUT_ELAPSED_TIME). Restart the timer:
int start_time = 0;
void spawntimer( int value )
{
pdx = dx;
dx = rand() % 3;
start_time = glutGet(GLUT_ELAPSED_TIME);
glutTimerFunc(interval, spawntimer, 0);
}
In taupe Calculate the relative position of the object dependent on the time in range [0.0, 1.0] and interpolate between tabPos[pdx] and tabPos[dx]. e.g:
void taupe(void){
int current_time = glutGet( GLUT_ELAPSED_TIME );
float dt = (float)(current_time - start_time) / interval;
if (dt > 1.0f)
dt = 1.0f;
float interx = tabPos[pdx] * (1.0f - dt) + tabPos[dx] * dt;
glPushMatrix();
glTranslatef(interx,dy,tabPos[dz]); // Ligne Milieu droite
glColor3f(0.8,0.3,0.5);
glutSolidCube(2);
glPopMatrix();
}
- Fast & accurate atan/arctan approximation algorithm
- What's the difference between strtok_r and strtok_s in C?
- How memory address for pointer to arrays is same as an element in 2D array?
- Which is the best way to suppress "unused variable" warning
- How to use ellipsis in c's case statement?
- How can I exclude non-numeric keys? CS50 Caesar Pset2
- Fast ceiling of an integer division in C / C++
- Is there an invalid pthread_t id?
- How does SIMD (avx) processing work? for example, if I want 10 32 bit floats how do i fit in a 256 bit avx vector?
- FDCAN problems on STM32G4
- How does the call macro enable mutual recursion between functions f and g in this Hanoi Tower implementation?
- Running test on Rocket core CPU - global variable initialized to 0 is unsuccessful, output wrong value instead
- Interacting with C arrays without knowing the size
- Combination of two strings
- Avoiding strcpy overflow destination warning
- carriage return by fgets
- How to use special characters in C?
- Why does 1.0/100.0 == 0.1/10.0 give True?
- Is it correct to compare pointers in C?
- Force free() to return malloc memory back to OS
- How can I print to standard error in C with 'printf'?
- What is the standard behavior of fread in C on Windows?
- How is strtok removing lines it shouldn't have access to?
- Using array as smart point in C
- Assigning string to malloced 2d char array not working as intended
- How to refactor repetition inside a Makefile?
- Why does an empty preprocessor command still evaluate to something?
- How to implement variable sized array within C struct
- Character array typecasting to integer
- Handling HTTP Headers in a Minimal C HTTP Server