使用draw()而不是eventloop时的pyglet

我正在尝试用 pyglet 画一个圆。但当我使用 draw() 函数而不是 app.run() 循环时，它是不可见的。有什么建议我可以做什么吗？谢谢

from math import *
from pyglet.gl import *

window = pyglet.window.Window()

def makeCircle(x_pos, y_pos, radius, numPoints):
    verts = []
    glClear(pyglet.gl.GL_COLOR_BUFFER_BIT)
    glColor3f(1,1,0)
    for i in range(numPoints):
        angle = radians(float(i)/numPoints * 360.0)
        x = radius *cos(angle) + x_pos
        y = radius *sin(angle) + y_pos
        verts += [x,y]
    circle = pyglet.graphics.vertex_list(numPoints, ('v2f', verts))
    circle.draw(GL_LINE_LOOP)
    input()

makeCircle(5,5, 100, 10)

你必须打电话window.flip() https://stackoverflow.com/questions/56748580/pyglet-when-using-draw-instead-of-eventloop更新窗口。

由于您没有设置投影矩阵，因此必须在标准化设备坐标中绘制几何图形，所有 3 个分量 (x, y, z) 的范围都在 [-1, 1] 内。注意，当应用程序启动时，pyglet 默认设置一个投影矩阵pyglet.app.run().

Call window.flip()并改变几何形状：

from math import *
from pyglet.gl import *

window = pyglet.window.Window()

def makeCircle(x_pos, y_pos, radius, numPoints):
    verts = []
    glClear(pyglet.gl.GL_COLOR_BUFFER_BIT)
    glColor3f(1,1,0)
    for i in range(numPoints):
        angle = radians(float(i)/numPoints * 360.0)
        x = radius *cos(angle) + x_pos
        y = radius *sin(angle) + y_pos
        verts += [x,y]
    circle = pyglet.graphics.vertex_list(numPoints, ('v2f', verts))
    circle.draw(GL_LINE_LOOP)

    window.flip()           # <--------

    input()

makeCircle(0, 0, 0.5, 10)   # <--------

或者，您可以自己设置正交投影，方法是glOrtho https://www.khronos.org/registry/OpenGL-Refpages/gl2.1/xhtml/glOrtho.xml. e.g.:

from math import *
from pyglet.gl import *

window = pyglet.window.Window()

def makeCircle(x_pos, y_pos, radius, numPoints):
    verts = []

    glMatrixMode(GL_PROJECTION)
    glOrtho(0, 640, 0, 480, -1, 1)
    glMatrixMode(GL_MODELVIEW)

    glClear(pyglet.gl.GL_COLOR_BUFFER_BIT)
    glColor3f(1,1,0)
    for i in range(numPoints):
        angle = radians(float(i)/numPoints * 360.0)
        x = radius *cos(angle) + x_pos
        y = radius *sin(angle) + y_pos
        verts += [x,y]
    circle = pyglet.graphics.vertex_list(numPoints, ('v2f', verts))
    circle.draw(GL_LINE_LOOP)

    text = 'This is a test but it is not visible'
    label = pyglet.text.Label(text, font_size=36,
                          x=10, y=10, anchor_x='left', anchor_y='bottom',
                          color=(255, 123, 255, 255))
    label.draw()

    window.flip()
    input()

makeCircle(5,5, 100, 10)