OpenGL绘制几个基本初等函数图像

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1.x三次方和x三分之一次方

#include <GL/glut.h> #include <math.h> void myDisplay(void) { 
    int i; glClear(GL_COLOR_BUFFER_BIT); glClearColor(1.0f, 1.0f, 0.5f, 1.0f); glColor3f(0.5f, 0.1f, 1.0f); glBegin(GL_LINE_STRIP); for (i = 0; i < 1000; i++) // 画 x 三分之一次方 glVertex2f(i * 0.001, pow(i * 0.001, 0.)); glEnd(); glBegin(GL_LINE_STRIP); // 画x三次方的 for (i = -1000; i < 0; i++) glVertex2f(i * 0.001, pow(i * 0.001, 3)); glEnd(); glFlush(); } int main(int argc, char* argv[]) { 
    glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE); glutInitWindowPosition(100, 100); glutInitWindowSize(400, 400); glutCreateWindow("复合函数"); glutDisplayFunc(&myDisplay); glutMainLoop(); return 0; } 

运行结果

2半立方抛物线

#include <GL/glut.h> #include <math.h> void myDisplay(void) { 
    int i; glClear(GL_COLOR_BUFFER_BIT); glClearColor(0.1f, 0.7f, 0.2f, 0.5f); glColor3f(0.0f, 0.0f, 1.0f); glBegin(GL_LINE_STRIP); for (i = 0; i < 1000; i++) glVertex2f(i * 0.001, sqrt(pow(0.9 * i * 0.001, 3))); glEnd(); glBegin(GL_LINE_STRIP); for (i = 0; i < 1000; i++) glVertex2f(i * 0.001, -sqrt(pow(0.9 * i * 0.001, 3))); glEnd(); glFlush(); } int main(int argc, char* argv[]) { 
    glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE); glutInitWindowPosition(100, 100); glutInitWindowSize(400, 400); glutCreateWindow("半立方抛物线"); glutDisplayFunc(&myDisplay); glutMainLoop(); return 0; } 

3.概率曲线

#include <GL/glut.h> #include <math.h> void myDisplay(void) { 
    int i; glClear(GL_COLOR_BUFFER_BIT); glClearColor(0.0f, 1.0f, 0.5f, 1.0f); glColor3f(0.5f, 0.0f, 1.0f); glBegin(GL_LINE_STRIP); for (i = -1000; i < 1000; i++) glVertex2f(i * 0.001, pow(2.9, -pow(i * 0.001, 2)) - 0.2); glEnd(); glFlush(); } int main(int argc, char* argv[]) { 
    glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE); glutInitWindowPosition(100, 100); glutInitWindowSize(400, 400); glutCreateWindow("概率曲线y=e^-(x^2)"); glutDisplayFunc(&myDisplay); glutMainLoop(); return 0; } 

4.ln(|x|)

 ```cpp #include <GL/glut.h> #include <math.h> void myDisplay(void) { 
    int i; glClear(GL_COLOR_BUFFER_BIT); glClearColor(0.0f, 0.5f, 0.7f, 0.5f); glColor3f(0.9f, 0.7f, 1.0f); gluOrtho2D(-3, 3, -3, 3); glBegin(GL_LINE_STRIP); for (i = -30000; i < 30000; i++){ 
    if (i == 0) continue; glVertex2f(i * 0.001, log(fabs(i * 0.001))); } glEnd(); glFlush(); } int main(int argc, char* argv[]) { 
    glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE); glutInitWindowPosition(100, 100); glutInitWindowSize(400, 400); glutCreateWindow("ln(|x|)"); glutDisplayFunc(&myDisplay); glutMainLoop(); return 0; }