OpenGL_mini_project/main.cpp at master · 64z/OpenGL_mini_project · GitHub

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#include<windows.h>
#include<iostream>
#include<GL/glut.h>
using namespace std;

int cx=0,cy=0,cz=0;
int cn;
struct Quads
{
    int x1,y1,z1,x2,y2,z2,x3,y3,z3,x4,y4,z4;
    float r,g,b;
    int state;
    int total;
};Quads Q[100];

void addQuad()
{
    Q[0].state++; if(Q[0].state>4){Q[0].state=1;}
    int st=Q[0].state;
    if(st==1){Q[0].total++;cn=Q[0].total;}
    if(st==1         ) {Q[cn].x1=cx;Q[cn].y1=cy;Q[cn].z1=cz;}
    if(st==1  || st==2       ) {Q[cn].x2=cx;Q[cn].y2=cy;Q[cn].z2=cz;}
    if(st==1   || st==2 || st==3       ) {Q[cn].x3=cx;Q[cn].y3=cy;Q[cn].z3=cz;}
    if(st==1   || st==2 || st==3  || st==4      ) {Q[cn].x4=cx;Q[cn].y4=cy;Q[cn].z4=cz;}
}

void drawQuads()
{
    int i;
    for(i=1;i<Q[0].total+1;i++)
    {
        glBegin(GL_QUADS);
        glColor3f(Q[i].r,Q[i].g,Q[i].b);
        glVertex3f(Q[i].x1,Q[i].y1,Q[i].z1);
         glVertex3f(Q[i].x2,Q[i].y2,Q[i].z2);
          glVertex3f(Q[i].x3,Q[i].y3,Q[i].z3);
           glVertex3f(Q[i].x4,Q[i].y4,Q[i].z4);
           glEnd();
    }
}
void drawGrid()
{
    int i;
    for(i=0;i<10;i++)
    {
        glPushMatrix();
        if(i<20) {glTranslatef(0,0,i);}
        if(i>=20) {glTranslatef(i-20,0,0);glRotatef(-90,0,1,0);}
        glBegin(GL_LINES);
        glColor3f(1,1,1);
        glLineWidth(1);
        glVertex3f(0,-0.1,0);
        glVertex3f(19,-0.1,0);
        glEnd();
        glPopMatrix();
    }
}


void keyboard(unsigned char key, int x,int y)
{
    if(key=='w') {cz-=1;} if(key=='s'){cz+=1;}
    if(key=='a') {cx-=1;} if(key=='d'){cx+=1;}
    if(key=='q') {cy+=1;} if(key=='z'){cy-=1;}
    if(key==32) {addQuad();}

    if(key=='r') {Q[cn].r=1;Q[cn].g=0,Q[cn].b=0;}
    if(key=='g') {Q[cn].r=0;Q[cn].g=1,Q[cn].b=0;}
    if(key=='b') {Q[cn].r=0;Q[cn].g=0,Q[cn].b=1;}
    if(key=='y') {Q[cn].r=1;Q[cn].g=1,Q[cn].b=0;}
    glutPostRedisplay();
}
void theCube()
{
    glPushMatrix();
    glColor3f(1,1,1);
    glTranslatef(cx,cy,cz);
    glutSolidCube(0.4);
    glPopMatrix();
}
void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glLoadIdentity();
    glTranslatef(-13,0,-45);
    glRotatef(40,1,1,0);
    drawGrid();
    drawQuads();
    theCube();
    glutSwapBuffers();
}

void init()
{

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(35,1.0f,0.1f,1000);
    glMatrixMode(GL_MODELVIEW);
    glEnable(GL_DEPTH_TEST);
    glClearColor(0.1,0.1,0.1,1);
}

int main(int argc,char **argv)
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_DOUBLE);
    glutInitWindowSize(800,600);
    glutCreateWindow("");
    glutDisplayFunc(display);
    glutMainLoop();
    return 0;

}