以opengl制作2D贪吃蛇（一）

1) 搭建好基本的窗口环境 要确定窗口大小, 通过确定子的大小(TILE_WIDTH, TILE_HEIGHT), 子的数量(TILE_COLUMN, TILE_ROW) 2) 画子 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(TIL

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>
#include <gl>

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 3.1415f
int   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 zero
	if(h == 0)
		h = 1;

	// Set Viewport to window dimensions
    glViewport(0, 0, w, h);

	// Reset coordinate system
	glMatrixMode(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 color
		glClearColor(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 color
	glClear(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


<p>编译得到</p>
<p>演示结果：</p>
<p><img  src="/static/imghw/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Fimg.blog.csdn.net%2F20131119171758109%3Fwatermark%2F2%2Ftext%2FaHR0cDovL2Jsb2cuY3Nkbi5uZXQvc3R1NzQx%2Ffont%2F5a6L5L2T%2Ffontsize%2F400%2Ffill%2FI0JBQkFCMA%3D%3D%2Fdissolve%2F70%2Fgravity%2FSouthEast&amp;refer=http%3A%2F%2Fblog.csdn.net%2Fstu741%2Farticle%2Fdetails%2F16826925" class="lazy" alt="以opengl制作2D贪吃蛇（一）" ><br>
</p>
<br>


</gl></gl></stdio.h>