Вот у меня созданный мною код для рисование функции Улитки Паскаля в OpenGL--Почему то график функции не отображается--если даже заменить содержание формули на параболу? В чем дело? Ибо линии рисуются.
| Код |
#include <stdio.h>
#include "math.h"
#include <tchar.h>
#include "windows.h"
#include <GL/glut.h>
int j=0;
int a=5;
int b=7;
//int a[3]={1, 0.5, 0.9};
//int b[3]={7, 0.4, 0.2};
float rav (float te) {
return a*cos(te)+b;
}
void display()
{
int n = 300;
glClear( GL_COLOR_BUFFER_BIT );
glBegin( GL_LINES );
glColor3d( 0.0, 0.0, 0.0 ); //1.Malyuyemo coordynatni osi chornym kolyorom
glVertex2d( 0, -11 );
glVertex2d( 0, 11 );
glVertex2d( -11, 0 );
glVertex2d( 11, 0 );
glColor3d( 0.5, 0.5, 0.5 ); //2.Malyuyemo coordynatnu sitku chornym kolyorom
glVertex2d( 0.5, -11 );
glVertex2d( 0.5, 11 );
glVertex2d( 0.5, -11 );
glVertex2d( 0.5, 11 );
glVertex2d( 1, -11 );
glVertex2d( 1, 11 );
glVertex2d( 1.5, -11 );
glVertex2d( 1.5, 11 );
glVertex2d( 2, -11 );
glVertex2d( 2, 11 );
glVertex2d( 2.5, -11 );
glVertex2d( 2.5, 11 );
glVertex2d( 3, -11 );
glVertex2d( 3, 11 );
glVertex2d( 3.5, -11 );
glVertex2d( 3.5, 11 );
glVertex2d( 4, -11 );
glVertex2d( 4, 11 );
glVertex2d( 4.5, -11 );
glVertex2d( 4.5, 11 );
glVertex2d( 5, -11 );
glVertex2d( 5, 11 );
glVertex2d( 5.5, -11 );
glVertex2d( 5.5, 11 );
glVertex2d( 6, -11 );
glVertex2d( 6, 11 );
glVertex2d( 6.5, -11 );
glVertex2d( 6.5, 11 );
glEnd();
glBegin(GL_LINE_STRIP);
glColor3d( 0.0, 0.0, 0.0 );
for(int i=0; i <= n; i++)
{
float x = (8/300)*i-4;
float y = rav (x);
glVertex2f( x, y );
}
glEnd();
glutSwapBuffers();
}
void resize( int width, int height )
{
glViewport( 0, 0, width, height );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
static double invRatio = 5.0;
gluOrtho2D( -invRatio, invRatio, -invRatio, invRatio );
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGB );
glutInitWindowSize(600,600);
glutInitWindowPosition(100, 100);
glutCreateWindow("Point");
glClearColor( 1.0, 1.0, 1.0, 1.0);
glutDisplayFunc( display );
glutReshapeFunc( resize );
glutMainLoop();
return 0;
}
void display()
{
int n = 300;
glClear( GL_COLOR_BUFFER_BIT );
glBegin( GL_LINES );
glColor3d( 0.0, 0.0, 0.0 ); //1.Malyuyemo coordynatni osi chornym kolyorom
glVertex2d( 0, -11 );
glVertex2d( 0, 11 );
glVertex2d( -11, 0 );
glVertex2d( 11, 0 );
glColor3d( 0.5, 0.5, 0.5 ); //2.Malyuyemo coordynatnu sitku chornym kolyorom
glVertex2d( 0.5, -11 );
glVertex2d( 0.5, 11 );
glVertex2d( 0.5, -11 );
glVertex2d( 0.5, 11 );
glVertex2d( 1, -11 );
glVertex2d( 1, 11 );
glVertex2d( 1.5, -11 );
glVertex2d( 1.5, 11 );
glVertex2d( 2, -11 );
glVertex2d( 2, 11 );
glVertex2d( 2.5, -11 );
glVertex2d( 2.5, 11 );
glVertex2d( 3, -11 );
glVertex2d( 3, 11 );
glVertex2d( 3.5, -11 );
glVertex2d( 3.5, 11 );
glVertex2d( 4, -11 );
glVertex2d( 4, 11 );
glVertex2d( 4.5, -11 );
glVertex2d( 4.5, 11 );
glVertex2d( 5, -11 );
glVertex2d( 5, 11 );
glVertex2d( 5.5, -11 );
glVertex2d( 5.5, 11 );
glVertex2d( 6, -11 );
glVertex2d( 6, 11 );
glVertex2d( 6.5, -11 );
glVertex2d( 6.5, 11 );
glEnd();
glBegin(GL_LINE_STRIP);
glColor3d( 0.0, 0.0, 0.0 );
for(int i=0; i <= n; i++)
{
float x = (8/300)*i-4;
float y = rav (x);
glVertex2f( x, y );
}
glEnd();
glutSwapBuffers();
}
void resize( int width, int height )
{
glViewport( 0, 0, width, height );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
static double invRatio = 5.0;
gluOrtho2D( -invRatio, invRatio, -invRatio, invRatio );
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGB );
glutInitWindowSize(600,600);
glutInitWindowPosition(100, 100);
glutCreateWindow("Point");
glClearColor( 1.0, 1.0, 1.0, 1.0);
glutDisplayFunc( display );
glutReshapeFunc( resize );
glutMainLoop();
return 0;
}
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Модератор: используйте подсветку кода |
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