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我正在擺弄圖形,並試圖找到一種方法來繪製我正在繪製的形狀(在這種情況下爲三角形)的窗口大小。但是,我只希望寬度更新,高度保持不變。我試過用glutGet(GLUT_SCREEN_WIDTH)作爲乘數或類似的(例如(GLUT_SCREEN_WIDTH/100) - 250)到我的形狀的頂點,但我覺得我可能會錯過一個關鍵的想法。我應該將縮放操作應用於視口,而不是形狀的點?每當我調整積分時,他們似乎都不會與窗口成比例。下面的代碼。試圖縮放OpenGL程序的寬度(但不是高度)?
#define GLUT_DISABLE_ATEXIT_HACK
#include <GL/glut.h>
#include <GL/gl.h>
//#include <assert.h>
void init (void)
{
glClearColor (1.0, 1.0, 0.0, 0.0); /* Set background to yellow */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
}
void display(void)
{
glClear (GL_COLOR_BUFFER_BIT);
glColor3f (0.0, 0.0, 1.0);
glBegin(GL_TRIANGLES);
glVertex2d (0.0, 0.0);
glVertex2d(1.0, 0.0);
glVertex2d (0.5, 0.866);
glEnd();
glFlush(); //Display immediately
}
void keyEscape(unsigned char key, int x, int y)
{
switch (key)
{
case 113: // 'Q' key for escape
int windowID = glutCreateWindow ("triangle");
glutDestroyWindow (windowID);
exit (0);
break;
}
glutPostRedisplay();
}
void mouseEscape(int button, int state, int x, int y)
{
if (button == GLUT_RIGHT_BUTTON && state == GLUT_DOWN)
{
int windowID = glutCreateWindow ("triangle");
glutDestroyWindow (windowID);
exit (0);
glutPostRedisplay();
}
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize (250, 250);
glutInitWindowPosition ((glutGet(GLUT_SCREEN_WIDTH)-250)/2, (glutGet(GLUT_SCREEN_HEIGHT)-250)/2);
glutCreateWindow ("triangle");
init();
glutKeyboardFunc(keyEscape);
glutMouseFunc(mouseEscape);
glutDisplayFunc(display);
glutMainLoop();
return 0;
}
哇!感謝所有有用的,實用的建議 - 將它用作正交變量的標量做到了!會做出調整,謝謝! :) – 2014-09-22 11:35:16