Question

我在python中使用OpenGl的代码有问题，我需要控制球在y轴上的移动。球在重力作用下但是当按下按钮时球会跳起来，但是当没有按下球落下这就像颜色改变/颜色切换游戏。问题是当我按下按钮一旦球继续向上并按下任何其他按钮它就会下降。

from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GLUT import *

def KB(Key, x, y):
    global pressed
    if Key == b"u":
        pressed = True
    else:
        pressed = False
    if Key == b"q":
        sys.exit()

yy = -0.07
dt = 0.0005
v_velocity = 3
xx = 0
max = False
pressed = False

def drw():
    global xx, max, v_velocity, dt, yy, pressed
    glClearColor(0, 0, 0, 1)
    glClear(GL_COLOR_BUFFER_BIT)
    glColor(1, 0, 0)
    glMatrixMode(GL_MODELVIEW)
    glLoadIdentity()
    glTranslate(xx, 0.4, 0)
    glBegin(GL_POLYGON)  # The Line
    glVertex2d(-0.8, 0.1)
    glVertex2d(-0.8, -0.1)
    glVertex2d(-0.2, -0.1)
    glVertex2d(-0.2, 0.1)
    glEnd()
    glColor(0, 1, 0)
    glBegin(GL_POLYGON)  # The Line
    glVertex2d(-0.2, 0.1)
    glVertex2d(-0.2, -0.1)
    glVertex2d(0.4, -0.1)
    glVertex2d(0.4, 0.1)
    glEnd()
    glColor(0, 0, 1)
    glBegin(GL_POLYGON)
    glVertex2d(0.4, 0.1)  # The Line
    glVertex2d(0.4, -0.1)
    glVertex2d(0.8, -0.1)
    glVertex2d(0.8, 0.1)
    glEnd()

    glLoadIdentity()
    glTranslate(0, yy, 0)
    glColor(0, 1, 0)
    glutSolidSphere(0.07, 25, 25)  # The ball

    # movement of the Line

    if xx > 1.5:
        max = True
    if xx < -1.5:
        max = False
    if max:
        xx -= 0.0005
    else:
        xx += 0.0005
    # ????? movement of the Ball  ???????
    if pressed:
        yy += 0.0007
    else:
        v_velocity = v_velocity - 9.8 * dt
        yy += v_velocity * dt

    glutSwapBuffers()

glutInit()
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE)
glutInitWindowSize(400, 400)
glutCreateWindow(b"Title")
glutDisplayFunc(drw)
glutKeyboardFunc(KB)
glutIdleFunc(drw)
glutMainLoop()

Answer 1

它被认为是因为你只是在没有按下键时设置重力：

if pressed:
    yy += 0.0007
else:
    v_velocity = v_velocity - 9.8 * dt
    yy += v_velocity * dt

所以按下按钮时，它只会上升，如果没有，它会下降是正常的。

Answer 2

您必须使用glutKeyboardFunc功能和glutKeyboardUpFunc功能。

虽然glutKeyboardFunc会发出按键被通知的通知，但glutKeyboardUpFunc会通知已释放密钥。
按下键时设置pressed = True，释放键时设置pressed = False。

此外，您应该初始化v_velocity = 0而不是v_velocity = 3。

 def KBPressed(Key, x, y):
    global pressed
    if Key == b"p":
        pressed = True
    if Key == b"q":
        sys.exit()

def KBUp(Key, x, y):
    global pressed
    if Key == b"p":
        pressed = False

glutKeyboardFunc(KBPressed)
glutKeyboardUpFunc(KBUp)

注意，您还可以使用特殊键glutSpecialFunc和glutSpecialUpFunc

的回调函数

e.g。＆＃34;向上＆＃34;键：

def SKUp(Key, x, y):
    global pressed
    if Key == GLUT_KEY_UP:
        pressed = False

def SKPressed(Key, x, y):
    global pressed
    if Key == GLUT_KEY_UP:
        pressed = True

glutSpecialFunc(SKPressed)
glutSpecialUpFunc(SKUp)

Python OpenGL控制球在重力效应下

2 个答案: