以opengl制作2D贪吃蛇（一）

来源：互联网发布：python命令大全编辑：程序博客网时间：2024/04/30 12:30

1) 搭建好基本的窗口环境
要确定窗口大小, 通过确定格子的大小(TILE_WIDTH, TILE_HEIGHT),

格子的数量(TILE_COLUMN, TILE_ROW)

2) 画格子
两个循环

/* * 1) 搭建好基本的窗口环境 *    要确定窗口大小, 通过确定格子的大小(TILE_WIDTH, TILE_HEIGHT), *                            格子的数量(TILE_COLUMN, TILE_ROW) */ //2) 画格子 //*    两个循环//3) 画方块来表示蛇的身体// *    glPointSize(..)#include <stdio.h>#include <GL/glew.h>#include <GL/freeglut.h>int TILE_WIDTH = 32;int TILE_HEIGHT = 32;const int TILE_COLUMN = 20;const int TILE_ROW = 11;const int dt = 33;  /* 毫秒数 */#define DIR_UP      0#define DIR_DOWN    1#define DIR_LEFT    2#define DIR_RIGHT   3#define GL_PI 3.1415fint   dir = DIR_RIGHT;float snake_x = 0;float snake_y = 0;float snake_v = 3;float food_x = 10;float food_y = 5; void ChangeSize(int w,int h) { GLfloat nRange = 100.0f; // Prevent a divide by zeroif(h == 0)h = 1;// Set Viewport to window dimensions    glViewport(0, 0, w, h);// Reset coordinate systemglMatrixMode(GL_PROJECTION);glLoadIdentity();// Establish clipping volume (left, right, bottom, top, near, far)    glOrtho (0.0f,TILE_COLUMN*TILE_WIDTH,TILE_ROW*TILE_HEIGHT,0,-1, 1);   glMatrixMode(GL_MODELVIEW);glLoadIdentity(); } void SetupRC()//在循环之前，为程序做一些一次性的设置{//  background colorglClearColor(0.0f, 0.0f, 0.0f, 1.0f );glColor3f(0.0f,1.0f,0.0f);    }void RenderScene(void){GLfloat x,y,z,angle;// Clear the window with current clearing colorglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);glPointSize(TILE_HEIGHT);glBegin(GL_POINTS);glVertex3f(snake_x+TILE_WIDTH/2,snake_y+TILE_HEIGHT/2,0.0f);glEnd();   for(float line_y=0;line_y<=TILE_ROW*TILE_HEIGHT;line_y += TILE_HEIGHT)   {   glBegin(GL_LINES);   glVertex2f(0.0f,line_y);   glVertex2f(TILE_COLUMN*TILE_WIDTH,line_y);   glEnd();   }   for(float line_x=0;line_x<=TILE_COLUMN*TILE_WIDTH;line_x+=TILE_WIDTH){glBegin(GL_LINES);glVertex2f(line_x,0.0f);glVertex2f(line_x,TILE_COLUMN*TILE_WIDTH);glEnd();}glPopMatrix();glutSwapBuffers();} int main(int argc,char* argv[]) {//基于GLUT的标准设置glutInit(&argc, argv);glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH | GLUT_STENCIL); glutInitWindowSize(TILE_WIDTH*TILE_COLUMN,TILE_HEIGHT*TILE_ROW);glutCreateWindow("Snake");glutReshapeFunc(ChangeSize);glutDisplayFunc(RenderScene);GLenum err = glewInit();if (GLEW_OK != err) {fprintf(stderr, "GLEW Error: %s\n", glewGetErrorString(err));return 1;}SetupRC();   glutMainLoop();} g++ -g nima.cpp -o nima -lGL -lglut -lGLEW

编译得到

演示结果：