adding solution of problem5 of exercies 1

Author: eslam

Exercise/Problem5.c

@@ -0,0 +1,72 @@
+#include <GL/glut.h>
+
+//Setting Camera
+float eye[] = {0.0, 0.0, 5.0};
+float center[] = {0.0, 0.0, 0.0};
+float up[] = {0.0, 1.0, 0.0};
+float alpha = 60;
+float theta = 60;
+void DB()
+{
+    glPushMatrix();
+    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+    glBegin(GL_POLYGON);
+    glVertex3f(0.0, 0.0, 0.0);
+    glVertex3f(1.0, 0.0, 0.0);
+    glVertex3f(1.0, 1.0, 0.0);
+    glVertex3f(0.0, 1.0, 0.0);
+    glEnd();
+    glPopMatrix();
+}
+void draw_block(float xs, float ys)
+{
+    glPushMatrix();
+    glScalef(xs, ys, 1.0);
+    glTranslatef(0.0, -0.5, 0.0);
+    DB();
+    glPopMatrix(); 
+}
+
+void draw_scene()
+{
+    glPushMatrix();
+    glTranslatef(1.0, 3.5, 0.0);
+    draw_block(2, 5);
+    glTranslatef(1.0, 1.5, 0.0);
+    glRotatef(alpha-90, 0.0, 0.0, 1.0); 
+    draw_block(3, 1);
+    glTranslatef(3.0, 0.0, 0.0);
+    glRotatef(theta, 0.0, 0.0, 1.0); 
+    draw_block(3, 1);
+    glPopMatrix();
+}
+void display()
+{
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glLoadIdentity();
+    draw_scene();
+    glutSwapBuffers();
+}
+
+void init()
+{
+    glEnable(GL_DEPTH_TEST);
+    glMatrixMode(GL_PROJECTION);
+    glOrtho(0, 10, 0, 10, 1, 10);
+    // gluPerspective(120.0, 1.0, 1.0, 10.0);
+    gluLookAt(eye[0], eye[1], eye[2],
+              center[0], center[1], center[2],
+              up[0], up[1], up[2]);
+    glMatrixMode(GL_MODELVIEW);
+}
+
+int main(int argc, char **argv)
+{
+    glutInit(&argc, argv);
+    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
+    glutCreateWindow("red 3D lighted sphere");
+    glutDisplayFunc(display);
+    init();
+    glutMainLoop();
+    return 0;
+}