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我正在摆弄图形,并试图找到一种方法来绘制我正在绘制的形状(在这种情况下为三角形)的窗口大小。但是,我只希望宽度更新,高度保持不变。我试过用glutGet(GLUT_SCREEN_WIDTH)作为乘数或类似的(例如(GLUT_SCREEN_WIDTH/100) - 250)到我的形状的顶点,但我觉得我可能会错过一个关键的想法。我应该将缩放操作应用于视口,而不是形状的点?每当我调整积分时,他们似乎都不会与窗口成比例。下面的代码。试图缩放OpenGL程序的宽度(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!感谢所有有用的,实用的建议 - 将它用作正交变量的标量做到了!会做出调整,谢谢! :) – 2014-09-22 11:35:16