如何更改 PyOpenGL 中位图字符的字体大小？

Question

我正在 PyOpenGL 中制作游戏，我正在使用一些重叠的文本。如何更改 OpenGL.GLUT 中包含的字体的字体大小？

这是我现在拥有的：

def blit_text(x,y,font,text,r,g,b):
    blending = False 
    if glIsEnabled(GL_BLEND):
        blending = True
    glColor3f(r,g,b)
    glWindowPos2f(x,y)
    for ch in text:
        glutBitmapCharacter(font,ctypes.c_int(ord(ch)))
    if not blending:
        glDisable(GL_BLEND)

blit_text(displayCenter[0] - 5,displayCenter[1] - 5,GLUT_BITMAP_TIMES_ROMAN_24,"*",0,1,0)

Answer 1

遗憾的是你不能。

glutBitmapCharacter uses glBitmap to raster (and "blit") the bitmap to the framebuffer, in 1:1 pixel ratio. Thus the bitmap can't be scaled and the position is set by glWindowPos respectively glRasterPos.

如果要绘制不同大小的文本，则必须选择不同的字体，请参阅 glutBitmapCharacter。

当您使用 glutStrokeCharacter 时，文本由线基元绘制。文字的粗细可以通过glLineWidth. The position and size of the text can depends on the current model view matrix a nd projection matrix. So the position of the text can be set by glTranslate and the size can be changed by glScale. The text can even be rotated by glRotate.

设置

例如：

def blit_text(x,y,font,text,r,g,b):

    glColor3f(r,g,b)
    glLineWidth(5)
    glTranslatef(x, y, 0)
    glScalef(1, 1, 1)
    for ch in text:
        glutStrokeCharacter(font,ctypes.c_int(ord(ch)))

glMatrixMode(GL_PROJECTION)
glLoadIdentity()
glOrtho(0, windowWidth, 0, windowHeight, -1, 1)
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()

blit_text(10, 10, GLUT_STROKE_ROMAN, "**", 0, 1, 0)

另请参阅 freeglut - 14. Font Rendering Functions 分别了解 glutBitmapString 的用法 glutStrokeString。

另见 Immediate mode and legacy OpenGL

如何更改 PyOpenGL 中位图字符的字体大小？

How to change font size of bitmap characters in PyOpenGL?

python

opengl

pygame

pyopengl

opengl-compat