我正在尝试在GLUT中制作一个简单的方形形状,它具有键盘功能,可以根据您按下的键在屏幕上移动。
试图这样做,但无论我尝试什么都行不通。
广场的代码
glPushMatrix();
glTranslatef(-0.9, 0.90, 0);
glBegin(GL_POLYGON);
glColor3f( 0.90, 0.91, 0.98);
glVertex2f(-0.10,-0.2);
glColor3f( 0.329412, 0.329412, 0.329412);
glVertex2f(-0.10, 0.2);
glColor3f( 0.90, 0.91, 0.98);
glVertex2f( 0.10, 0.2);
glVertex2f( 0.10,-0.2);
glEnd();
glPopMatrix();
答案 0 :(得分:0)
您需要一些键盘回调和位置更新逻辑。
尝试这样的事情:
#include <GL/glut.h>
#include <map>
std::map< int, bool > keys;
void special( int key, int x, int y )
{
keys[ key ] = true;
}
void specialUp( int key, int x, int y )
{
keys[ key ] = false;
}
void display()
{
static float xpos = 0;
static float ypos = 0;
const float speed = 0.02;
if( keys[ GLUT_KEY_LEFT ] )
{
xpos -= speed;
}
if( keys[ GLUT_KEY_RIGHT ] )
{
xpos += speed;
}
if( keys[ GLUT_KEY_UP ] )
{
ypos += speed;
}
if( keys[ GLUT_KEY_DOWN ] )
{
ypos -= speed;
}
glClearColor( 0, 0, 0, 1 );
glClear( GL_COLOR_BUFFER_BIT );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glOrtho( -2, 2, -2, 2, -1, 1 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
glTranslatef( xpos, ypos, 0 );
glTranslatef(-0.9, 0.90, 0);
glBegin(GL_POLYGON);
glColor3f( 0.90, 0.91, 0.98);
glVertex2f(-0.10,-0.2);
glColor3f( 0.329412, 0.329412, 0.329412);
glVertex2f(-0.10, 0.2);
glColor3f( 0.90, 0.91, 0.98);
glVertex2f( 0.10, 0.2);
glVertex2f( 0.10,-0.2);
glEnd();
glutSwapBuffers();
}
void timer( int value )
{
glutTimerFunc( 16, timer, 0 );
glutPostRedisplay();
}
int main( int argc, char **argv )
{
glutInit( &argc, argv );
glutInitDisplayMode( GLUT_RGBA | GLUT_DOUBLE );
glutInitWindowSize( 640, 640 );
glutCreateWindow( "GLUT" );
glutDisplayFunc( display );
glutSpecialFunc( special );
glutSpecialUpFunc( specialUp );
glutTimerFunc( 0, timer, 0 );
glutMainLoop();
return 0;
}