Zh

#include <windows.h>
#include <GL/glut.h>
#include <math.h>

GLint width=800;
GLint height=800;
GLint scale=20;
GLint centox=400;
GLint centroy=400;

void display(){
    glClear(GL_COLOR_BUFFER_BIT);
    glLineWidth(1);
    for(int i=0;i<width;i+=scale){
    glColor3ub(192,192,192);
        glBegin(GL_LINES);
        glVertex2f(i,0);
        glVertex2f(i,800);
        glVertex2f(0,i);
        glVertex2f(800,i);
        glEnd();
    }
    glLineWidth(2);
    glBegin(GL_LINES);
        glColor3f(0,0,0);
        glVertex2f(centox,0);
        glVertex2f(centox,800);
        glVertex2f(0,centroy);
        glVertex2f(800,centroy);
    if(centroy<800){
        glVertex2f(centox,800);
        glVertex2f(centox-10,785);
        glVertex2f(centox,800);
        glVertex2f(centox+10,785);
    }
    if(centox<800){
        glVertex2f(785,centroy+10);
        glVertex2f(800,centroy);
        glVertex2f(785,centroy-10);
        glVertex2f(800,centroy);
    }
    glEnd();

    for(int i=0;i<width;i+=scale){
        glLineWidth(1);
        glBegin(GL_LINES);
        glColor3f(0.0,0.0,0.0);
        glVertex2f(i,centroy-10);
        glVertex2f(i,centroy+10);
        glVertex2f(centox-10,i);
        glVertex2f(centox+10,i);
        glEnd();
    }
    double x,y;
    glLineWidth(3);
    glBegin(GL_LINE_STRIP);
    glColor3ub(233,100,52);
    for(x=-30;x<2;x+=0.0001){
        y=-log10(x+2);
        glVertex2f(x*scale+centox,y*scale+centroy);
    }
    for(x=2;x<30;x+=0.0001){
        y=-log10(x+2);
        glVertex2f(x*scale+centox,y*scale+centroy);
    }
    glEnd();
    glColor3f(0.0,0.0,0.0);
    glPushMatrix();
    glTranslated(centox+15,790,0);
    glScaled(0.2,0.2,0);
    glutStrokeCharacter(GLUT_STROKE_ROMAN,'y');
    glPopMatrix();
    glPushMatrix();
    glTranslated(780,centroy-35,0);
    glScaled(0.2,0.2,0);
    glutStrokeCharacter(GLUT_STROKE_ROMAN,'x');
    glPopMatrix();
    char k[11]="0123456789";
    int j=0,s=1,s1=1,s2=1;

    for(int i=centox-2;i<800;i+=scale){
        glPushMatrix();
        glTranslated(i,centroy-30,0);
        glScaled(0.08,0.1,0);
        if(j<10){
            glutStrokeCharacter(GLUT_STROKE_ROMAN,k[j]);
        }
        else{
            glutStrokeCharacter(GLUT_STROKE_ROMAN,k[j/10]);
            glutStrokeCharacter(GLUT_STROKE_ROMAN,k[j%10]);
        }
        j++;
        glPopMatrix();
    }
    for(int i=centox-scale;i>0;i-=scale){
        glPushMatrix();
        glTranslated(i,centroy-30,0);
        glScaled(0.08,0.1,0);
        glutStrokeCharacter(GLUT_STROKE_ROMAN,'-');
        if(s1<10){
            glutStrokeCharacter(GLUT_STROKE_ROMAN,k[s1]);
        }
        else{
            glutStrokeCharacter(GLUT_STROKE_ROMAN,k[s1/10]);
            glutStrokeCharacter(GLUT_STROKE_ROMAN,k[s1%10]);
        }
        s1++;
        glPopMatrix();
    }
    for(int i=centroy+scale-5;i<800;i+=scale){
        glPushMatrix();
        glTranslated(centox+10,i,0);
        glScaled(0.08,0.1,0);
        if(s<10){
            glutStrokeCharacter(GLUT_STROKE_ROMAN,k[s]);
        }
        else{
            glutStrokeCharacter(GLUT_STROKE_ROMAN,k[s/10]);
            glutStrokeCharacter(GLUT_STROKE_ROMAN,k[s%10]);
        }
        s++;
        glPopMatrix();
    }
    for(int i=centroy-scale-5;i>0;i-=scale){
        glPushMatrix();
        glTranslated(centox+10,i,0);
        glScaled(0.08,0.1,0);
        glutStrokeCharacter(GLUT_STROKE_ROMAN,'-');
        if(s2<10){
            glutStrokeCharacter(GLUT_STROKE_ROMAN,k[s2]);
        }
        else{
            glutStrokeCharacter(GLUT_STROKE_ROMAN,k[s2/10]);
            glutStrokeCharacter(GLUT_STROKE_ROMAN,k[s2%10]);
        }
        s2++;
        glPopMatrix();}
        glPushMatrix();
        glColor3ub(0.0,0.0,0.0);
        glTranslated(20,750,0);
        glScaled(0.2,0.2,0);
        char f[20]="-lg(x+2)";
        for(int i=0;i<13;i++){
            glutStrokeCharacter(GLUT_STROKE_ROMAN,f[i]);
        }
        glPopMatrix();
        glFlush();
    glutSwapBuffers();
}
void Keyboard(unsigned char key, int x, int y){
        if(key=='+'){
            scale=scale*2;
        }
        if(key=='-'){
            if (scale>20){
                scale=scale/2;
            }
        }
        if(key=='a'){
            centox+=scale;
        }
        if(key=='d'){
            centox-=scale;
        }
        if(key=='w'){
            centroy-=scale;
        }
        if(key=='s'){
            centroy+=scale;
        }
        if(key=='r'){
            centox=400;
            centroy=400;
        }
        glutPostRedisplay();
}


int main(int argc,char **argv){
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA);
    glutInitWindowSize(800,800);
    glutCreateWindow("Tretyakov");
    glClearColor(1,1,1,0);
    glMatrixMode(GL_PROJECTION);
    gluOrtho2D(0.0,800.0,0.0,800.0);
    glutDisplayFunc(display);
    glutKeyboardFunc(Keyboard);
    glutMainLoop();
    return 0;
}