void text(string str)
{
for (int i = 0; i < str.length(); i++)
{
glColor3f(0.0f, 0.0f, 0.0f);
glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, str[i]);
}
}
void render(void)
{
int width = glutGet(GLUT_WINDOW_WIDTH);
int height = glutGet(GLUT_WINDOW_HEIGHT);
if (height == 0) height = 1;
GLfloat aspect = (GLfloat)width / (GLfloat)height;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_SCISSOR_TEST);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f, aspect, 0.1f, 100.0f);
// Top view - top left
glViewport(0, 0, width/2, height/2);
glScissor(0, 0, width/2, height/2);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
PilotView(0.0f, 0.0f, -5.0f, 0.0f, 0.0f, 0.0f, 1.0f);
glRasterPos3f(-0.1f, -0.1f, 4.0f);
text("Front");
diode();
// Corner view - top right
glViewport(width/2, 0, width/2, height/2);
glScissor(width/2, 0, width/2, height/2);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
PilotView(0.0f, 0.0f, -5.0f, 0.0f, -90.0f, 0.0f, 1.0f);
glRasterPos3f(4.0f, -0.1f, 0.1f);
text("Right");
diode();
// Front view - bottom left
glViewport(0, height/2, width/2, height/2);
glScissor(0, height/2, width/2, height/2);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
PilotView(0.0f, 0.0f, -5.0f, 90.0f, 0.0f, 0.0f, 1.0f);
glRasterPos3f(-0.1f, 4.0f, 0.0f);
text("Top");
diode();
// Right view - bottom right
glViewport(width/2, height/2, width/2, height/2);
glScissor(width/2, height/2, width/2, height/2);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
PilotView(0.0f, 0.0f, -5.0f, 20.0f, 0.0f, 0.0f, 1.0f);
glRasterPos3f(-0.1f, 4.0f, 0.0f);
text("Fro4nt");
diode();
glDisable(GL_SCISSOR_TEST);
glutSwapBuffers();
}
我不确定白色“前”和黄色“上” /“右”的来源(就颜色而言)。他们都应该是黑色的。有人知道这个问题是什么吗?
输出如下所示:
最佳答案
令人怀疑,这可能会令人震惊,但是当您调用该函数时,glRasterPos (...)
实际上会跟踪“当前”颜色。也就是说,在调用glRasterPos (...)
之前设置的任何颜色都将用作该位置上绘制操作的“当前颜色”。我将在下面解释,将其几乎视为光栅化器与glVertex (...)
的类似物。
为此,您需要先设置当前颜色,然后再调用glRasterPos (...)
,为此,您应该从glColor3f (...)
函数中完全删除text (...)
调用,或者修改该函数以同时执行这两种操作-设置颜色,然后设置栅格pos,然后绘制文本。
glRasterPos — specify the raster position for pixel operations:
关于c++ - 文字颜色不正确,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/20365304/