This assignment is given in Computer Graphics Lecture in Ankara University. This is assignment #2. To complete this assignment, a little bit OpenGL knowledge is required. Task is to model and animate a 3D ball-and-stick man according to the sketch given on the right:
- The body, neck, upper/lower arms and legs should be constructed from scaled cylinders.
- The head should be constructed from a sphere.
- Spheres of appropriate size should be placed to joints (marked with red on the sketch) so that there won’t be any gaps when these joints are animated.
- The arms should comprise two parts (upper and lower arms) but legs should be a single part (i.e. without knees).
You do not have to make your stick man particularly realistic; however, you should shade and light it suitably. After you produce the model, you should implement the following user interaction features:
- Left and right arrow keys should move the camera long the horizontal axis.
- Up and down arrow keys should move the camera along the vertical axis.
- Left mouse click should initiate a waving animation sing either one or two arms. The animation should continue until a second left click.
- Right Mouse click should make the model walk along any axis of your choice. The animation should stop if the user clicks on the right mouse button again. During walk animation, the arms may remain steady but the legs should move properly while the model is being translated. This means that the model can wave while walking or the camera can be move while the model is being animated.
Here is the code with comments. But there is no light or shadow effect. If you have any problem, please feel free to write comment.
#include <stdio.h> #include <stdlib.h> #include <math.h> #include <glut.h>
int rightHandAngle = 180; // Angle of lower right hand bool mouseLeftState = false; // Is left mouse clicked? bool mouseRightState = false; // Is right mouse clicked? int rightHandMove = 2; // If left mouse clicked, right hand will rotate 2 degrees. int leftLegMove = 1; // If right mouse clicked, left leg will move by 1. int rightLegMove = -1; // If right mouse clicked, right leg will move by 1. int leftLegAngle = 90; // If right mouse clicked, this variable will be used to rotate left leg and it initialized to 90 degrees for first position of leg. int rightLegAngle = 90; // If right mouse clicked, this variable will be used to rotate right leg and it initialized to 90 degrees for first position of leg. float zMove = 0.0; // If right mouse clicked, this variable will be used to change position of object. Object will move on z-axis.
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void display() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix(); //BODY glColor3f(1.0, 0.647, 0.0); glTranslatef(0.0, 221, zMove); glRotatef(90, 1.0, 0.0, 0.0); GLUquadricObj* body = gluNewQuadric(); gluQuadricDrawStyle(body, GLU_FILL); gluCylinder(body, 120, 120, 300, 30, 30); glPopMatrix();
glPushMatrix(); //LEFT UPPER ARM glColor3f(0.180f, 0.545f, 0.341f); glTranslatef(-80, 160, zMove); glRotatef(-45, 0.0, 0.0, 1.0); glRotatef(90, 1.0, 0.0, 0.0); GLUquadricObj* leftUpperArm = gluNewQuadric(); gluQuadricDrawStyle(leftUpperArm, GLU_FILL); gluCylinder(leftUpperArm, 16, 16, 200, 30, 30); glPopMatrix();
glPushMatrix(); // LEFT UPPER ARM AND BODY CONNECTION glColor3f(1.0, 0.0, 0.0); glPushMatrix(); glTranslatef(-80.0, 160, zMove); glutSolidSphere(16, 30, 30); glPopMatrix();
glPushMatrix(); //LEFT LOWER ARM glColor3f(1.0, 1.0, 0.0); glTranslatef(-221.5, 19.5, zMove); glRotatef(225, 0.0, 0.0, 1.0); glRotatef(90, 1.0, 0.0, 0.0); GLUquadricObj* leftLowerArm = gluNewQuadric(); gluQuadricDrawStyle(leftLowerArm, GLU_FILL); gluCylinder(leftLowerArm, 16, 16, 200, 30, 30); glPopMatrix();
glPushMatrix(); // LEFT LOWER ARM AND LEFT UPPER ARM CONNECTION glColor3f(1.0, 0.0, 0.0); glPushMatrix(); glTranslatef(-221.5, 19.5, zMove); glutSolidSphere(16, 30, 30); glPopMatrix();
glPushMatrix(); //RIGHT UPPER ARM glColor3f(0.180f, 0.545f, 0.341f); glTranslatef(80, 160, zMove); glRotatef(90, 0.0, 0.0, 1.0); glRotatef(90, 1.0, 0.0, 0.0); GLUquadricObj* rightUpperArm = gluNewQuadric(); gluQuadricDrawStyle(rightUpperArm, GLU_FILL); gluCylinder(rightUpperArm, 16, 16, 200, 30, 30); glPopMatrix();
glPushMatrix(); // RIGHT UPPER ARM AND BODY CONNECTION glColor3f(1.0, 0.0, 0.0); glPushMatrix(); glTranslatef(80, 160, zMove); glutSolidSphere(16, 30, 30); glPopMatrix();
glPushMatrix(); //RIGHT LOWER ARM glColor3f(1.0, 1.0, 0.0); glTranslatef(280, 160, zMove); glRotatef((GLfloat)rightHandAngle, 0.0, 0.0, 1.0); glRotatef(90, 1.0, 0.0, 0.0); GLUquadricObj* rightLowerArm = gluNewQuadric(); gluQuadricDrawStyle(rightLowerArm, GLU_FILL); gluCylinder(rightLowerArm, 16, 16, 200, 30, 30); glPopMatrix();
glPushMatrix(); // RIGHT LOWER ARM AND RIGHT UPPER ARM CONNECTION glColor3f(1.0, 0.0, 0.0); glPushMatrix(); glTranslatef(280, 160, zMove); glutSolidSphere(16, 30, 30); glPopMatrix();
glPushMatrix(); //LEFT LEG glColor3f(0.180f, 0.545f, 0.341f); glTranslatef(-35, -20, zMove); glRotatef(-15, 0.0, 0.0, 1.0); glRotatef((GLfloat)leftLegAngle, 1.0, 0.0, 0.0); GLUquadricObj* leftLeg = gluNewQuadric(); gluQuadricDrawStyle(leftLeg, GLU_FILL); gluCylinder(leftLeg, 16, 16, 400, 30, 30); glPopMatrix();
glPushMatrix(); // LEFT LEG AND BODY CONNECTION glColor3f(1.0, 0.0, 0.0); glPushMatrix(); glTranslatef(-35, -20, zMove); glutSolidSphere(16, 30, 30); glPopMatrix();
glPushMatrix(); //RIGHT LEG glColor3f(0.180f, 0.545f, 0.341f); glTranslatef(35, -20, zMove); glRotatef(15, 0.0, 0.0, 1.0); glRotatef((GLfloat)rightLegAngle, 1.0, 0.0, 0.0); GLUquadricObj* rightLeg = gluNewQuadric(); gluQuadricDrawStyle(rightLeg, GLU_FILL); gluCylinder(rightLeg, 16, 16, 400, 30, 30); glPopMatrix();
glPushMatrix(); // RIGHT LEG AND BODY CONNECTION glColor3f(1.0, 0.0, 0.0); glPushMatrix(); glTranslatef(35, -20, zMove); glutSolidSphere(16, 30, 30); glPopMatrix();
glPushMatrix(); //NECK glColor3f(0.0, 0.0, 0.545); glTranslatef(0.0, 251, zMove); glRotatef(90, 1.0, 0.0, 0.0); GLUquadricObj* neck = gluNewQuadric(); gluQuadricDrawStyle(neck, GLU_FILL); gluCylinder(neck, 20, 20, 30, 30, 30); glPopMatrix();
glPushMatrix(); // HEAD glColor3f(1.0, 0.647, 0.0); glPushMatrix(); glTranslatef(0.0, 350, zMove); glutSolidSphere(100, 30, 30); glPopMatrix();
if (mouseLeftState == true) { // If left mouse clicked right hand of object will shake its lower arm if (rightHandAngle >= 225) { // If angle is greater than 225 incrementing degree will become decrement rightHandMove = -rightHandMove; } else if (rightHandAngle <= 135){ // If angle is lower than 135 decrementing degree will become increment rightHandMove = -rightHandMove; } rightHandAngle = (rightHandAngle + rightHandMove) % 360; // changing angle of right hand. } if (mouseRightState == true) { // If right mouse clicked the object will ve moved and legs' angles will be changed. if (leftLegAngle > 110){ leftLegMove = -leftLegMove; } else if (leftLegAngle < 70){ leftLegMove = -leftLegMove; } leftLegAngle = (leftLegAngle + leftLegMove) % 360; // Changing angle of left leg
if (rightLegAngle > 110) { rightLegMove = -rightLegMove; } else if (rightLegAngle < 70){ rightLegMove = -rightLegMove; } rightLegAngle = (rightLegAngle + rightLegMove) % 360; // Changing angle of right leg zMove += 1.5f; // Moving object on the z-axis } glutSwapBuffers(); } void keyboard(unsigned char key, int x, int y) { if (key == 27) // exit when user hits <esc> exit(EXIT_SUCCESS); }
void rotate(int key, int x, int y) { if (key == GLUT_KEY_LEFT){ glRotatef(-1, 0.0, 1.0, 0.0); // Rotates left by 1 degree glutPostRedisplay(); } if (key == GLUT_KEY_RIGHT){
glRotatef(1, 0.0, 1.0, 0.0); // Rotates right by 1 degree glutPostRedisplay(); } if (key == GLUT_KEY_UP){ glRotatef(1, 1.0, 0.0, 0.0); // Rotates up by 1 degree glutPostRedisplay(); } if (key == GLUT_KEY_DOWN){ glRotatef(-1, 1.0, 0.0, 0.0); // Rotates down by 1 degree glutPostRedisplay(); } }
void mouse(int button, int state, int x, int y){ if (GLUT_LEFT_BUTTON == button && state == GLUT_DOWN && mouseLeftState == false){ // If left button is clicked, left state will be true for shaking lower arm mouseLeftState = true; } else if (GLUT_LEFT_BUTTON == button && state == GLUT_DOWN && mouseLeftState == true){ // If left button is clicked again, left state will be false and shaking will stop. mouseLeftState = false; } else if (GLUT_RIGHT_BUTTON == button && state == GLUT_DOWN && mouseRightState == false){ // If right button is clicked again, moving of object and rotation of legs will stop. mouseRightState = true; } else if (GLUT_RIGHT_BUTTON == button && state == GLUT_DOWN && mouseRightState == true){ // If right button is clicked, right state will be true and moving object and rotation of legs will start mouseRightState = false; } }
void timer(int notUsed) { // Timer is for animation. This function provides us to redisplay all objects by every 100 miliseconds glutPostRedisplay(); glutTimerFunc(100, timer, 0); }
int main(int argc, char *argv[]) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); glEnable(GL_DEPTH_TEST); // Hidden surface removal glutInitWindowSize(1200, 700); glutCreateWindow(argv[0]); glClearColor(0.0, 1.0, 1.0, 0.0); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(-750.0, 750.0, -500.0, 500.0, -500.0, 500.0); // Changing the coordinate system. glutDisplayFunc(display); glutSpecialFunc(rotate); glutKeyboardFunc(keyboard); glutMouseFunc(mouse); timer(0); glutMainLoop(); return EXIT_SUCCESS; }
