74 lines
1.6 KiB
C++
74 lines
1.6 KiB
C++
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#include <iostream>
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#include <cstdlib>
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#include <GL/glut.h>
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GLfloat light_diffuse[] = {1.0, 0.0, 0.0, 1.0}; /* Red diffuse light. */
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GLfloat light_position[] = {1.0, 1.0, 1.0, 0.0}; /* Infinite light location. */
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void draw()
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{
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glLineWidth(2.0f);
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glColor3d(0,0,0);
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float line[21];
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for(auto i = 0; i < 21; ++i)
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line[i] = 0;
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for(auto y = 0; y < 100; ++y)
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{
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glBegin(GL_LINE_STRIP);
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for(auto x = 0; x < 21; ++x)
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{
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line[x] += (rand() % 5 - 2) / 4.0f;
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glVertex3f(x - 10, line[x], 25.0 - y);
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}
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glEnd();
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}
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}
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void display()
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{
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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draw();
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glutSwapBuffers();
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}
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void init()
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{
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// dvereb:
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srand(time(NULL));
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/* Enable a single OpenGL light. */
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glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
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glLightfv(GL_LIGHT0, GL_POSITION, light_position);
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glEnable(GL_LIGHT0);
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glEnable(GL_LIGHTING);
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/* Use depth buffering for hidden surface elimination. */
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glEnable(GL_DEPTH_TEST);
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/* Setup the view of the cube. */
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glMatrixMode(GL_PROJECTION);
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gluPerspective( /* field of view in degree */ 40.0,
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/* aspect ratio */ 1.0,
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/* Z near */ 1.0, /* Z far */ 1000.0);
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glMatrixMode(GL_MODELVIEW);
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gluLookAt(0.0, 7.0, 25.0, /* eye is at (0,0,5) */
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0.0, 0.0, 0.0, /* center is at (0,0,0) */
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0.0, 1.0, 0.); /* up is in positive Y direction */
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}
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int main(int argc, char *argv[])
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{
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glutInit(&argc, argv);
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glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
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glutCreateWindow("test opengl program");
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glutDisplayFunc(display);
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init();
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glutMainLoop();
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return 0;
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}
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