汽车opengl转换的旋转轮胎轮辋 [英] rotating tire rims of car opengl transformations

问题描述

这里是绘制功能，可绘制汽车零件，在此功能中，检查了汽车轮辋并检查了标志，并且在移动汽车时我需要旋转轮胎轮辋.由于轮辋已旋转但从汽车模型中取出，所以当我按向上箭头键，但汽车确实移动时，某事无法正常工作.

Here is the draw function which draws the parts of the car, in this function car rims is checked and flag is checked, and i need to rotate the tire rim as i move the car. Something is not working since the rims are rotated but taken out from the car model, when i press up arrow key, but the car does move.

我还在初始化函数中初始化了self.fFlag ="false":

I also initialized self.fFlag = "false" in initialize function:

def on_draw(self):
    # Clears the screen and draws the car
    # If needed, extra transformations may be set-up here
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)


    for name in self.parts:
        colors = self.colors
        color = colors.get(name, colors["default"])
        glColor3f(*color)

        if (name == 'Front Driver tire rim') & (self.fFlag == "true"):
            bodyFace = self.mini.group(name)
            glPushMatrix()
            glRotatef(45,1,0,0)

            # Drawing the rim
            for face in bodyFace:
                if len(face) == 3:
                    glBegin(GL_TRIANGLES) 
                elif len(face) == 4:
                    glBegin(GL_QUADS) 
                else: 
                    glBegin(GL_POLYGON)
                for i in face:
                    glNormal3f(*self.mini.normal(i))
                    glVertex3f(*self.mini.vertex(i))
                glEnd()



            glPopMatrix()
            self.fFlag == "false"

        else:
            bodyFace = self.mini.group(name)
            for face in bodyFace:
                if len(face) == 3:
                    glBegin(GL_TRIANGLES) 
                elif len(face) == 4:
                    glBegin(GL_QUADS) 
                else: 
                    glBegin(GL_POLYGON)
                for i in face:
                    glNormal3f(*self.mini.normal(i))
                    glVertex3f(*self.mini.vertex(i))
                glEnd()



def on_key_release(self, symbol, modifiers):
    """Process a key pressed event.
    """

    if symbol == key.UP:
        # Move car forward
        # TODO

        glTranslatef(0,-1,0)
        self.fFlag = "true"
        self.on_draw()

        pass

当我按下向上箭头键时，我试图使汽车轮辋旋转，从而使汽车向前移动.

Edited: I am trying to make the car rims to rotate when i press the up arrow key, which moves the car forward.

推荐答案

要将零件绕其中心旋转，您需要将其平移到原点，然后旋转，然后再平移回去.

In order to rotate a part about its own center, you need to translate it to the origin, rotate it, and translate it back.

所以你的

        glRotatef(45,1,0,0) # rotate 45 deg about x axis (thru the world origin)

需要在翻译之前和之后进行翻译.

needs to be preceded and followed by translations.

请参见接受的答案这个问题.

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