上一篇中我們繪制了一個彩色的三角型
這次我們讓它動起來

#include <GL/gl.h>
#include <SDL/SDL.h>
bool running=true;
float y=0.0;

void initGL()
{
?? ?SDL_Init(SDL_INIT_VIDEO);
?? ?SDL_SetVideoMode(600,300,16,SDL_OPENGL);
?? ?
}
void destroyGL()
{
?? ?SDL_Quit();
}
void draw()
{
?? ?glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
?? ?glRotatef(y,0,1,0);
?? ?glBegin(GL_TRIANGLES);
?? ??? ?glColor3f(1,0,0);
?? ??? ?glVertex3f(0,0,0);
?? ??? ?glColor3f(0,1,0);
?? ??? ?glVertex3f(1,0,0);
?? ??? ?glColor3f(0,0,1);
?? ??? ?glVertex3f(0,1,0);
?? ?glEnd();

?? ?SDL_GL_SwapBuffers();

}
void quit()
{
?? ?running=false;
}
void onKeyDown(const SDL_Event& event)
{
?? ?switch(event.key.keysym.sym)
?? ?{
?? ?case SDLK_ESCAPE:
?? ?quit();
?? ?break;
?? ?case SDLK_LEFT:
?? ?y+=0.1;
?? ?break;
?? ?case SDLK_RIGHT:
?? ?y-=0.1;
?? ?break;

?? ?
?? ?}
}
void loop()
{
?? ?SDL_Event event;
?? ?while(running)
?? ?{
?? ??? ?while(SDL_PollEvent(&event))
?? ??? ?{
?? ??? ??? ?switch(event.type)
?? ??? ??? ?{
?? ??? ??? ?case SDL_QUIT:
?? ??? ??? ??? ?quit();
?? ??? ??? ?break;
?? ??? ??? ?case SDL_KEYDOWN:
?? ??? ??? ??? ?onKeyDown(event);
?? ??? ??? ?break;
?? ??? ??? ?}
?? ??? ?}
?? ??? ?draw();
?? ??? ?SDL_Delay(50);
?? ?}

}
int main(int argc,char* argv[])
{
?? ?initGL();
?? ?loop();
?? ?destroyGL();?? ?
?? ?return 0;
}
#include <GL/gl.h>
#include <SDL/SDL.h>
bool running=true;
float y=0.0;

void initGL()
{
??? SDL_Init(SDL_INIT_VIDEO);
??? SDL_SetVideoMode(600,300,16,SDL_OPENGL);
???
}
void destroyGL()
{
??? SDL_Quit();
}
void draw()
{
??? glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
??? glRotatef(y,0,1,0);
??? glBegin(GL_TRIANGLES);
??? ??? glColor3f(1,0,0);
??? ??? glVertex3f(0,0,0);
??? ??? glColor3f(0,1,0);
??? ??? glVertex3f(1,0,0);
??? ??? glColor3f(0,0,1);
??? ??? glVertex3f(0,1,0);
??? glEnd();

??? SDL_GL_SwapBuffers();

}
void quit()
{
??? running=false;
}
void onKeyDown(const SDL_Event& event)
{
??? switch(event.key.keysym.sym)
??? {
??? case SDLK_ESCAPE:
??? quit();
??? break;
??? case SDLK_LEFT:
??? y+=0.1;
??? break;
??? case SDLK_RIGHT:
??? y-=0.1;
??? break;

???
??? }
}
void loop()
{
??? SDL_Event event;
??? while(running)
??? {
??? ??? while(SDL_PollEvent(&event))
??? ??? {
??? ??? ??? switch(event.type)
??? ??? ??? {
??? ??? ??? case SDL_QUIT:
??? ??? ??? ??? quit();
??? ??? ??? break;
??? ??? ??? case SDL_KEYDOWN:
??? ??? ??? ??? onKeyDown(event);
??? ??? ??? break;
??? ??? ??? }
??? ??? }
??? ??? draw();
??? ??? SDL_Delay(50);
??? }

}
int main(int argc,char* argv[])
{
??? initGL();
??? loop();
??? destroyGL();???
??? return 0;
}