SDL减慢动画速度

Question

如何减慢动画的速度，以便当精灵向右移动时，它看起来不像是在跳过？例如，当我按下右边时，我希望精灵看起来像是走到下一个瓷砖，而不是跳过。这是单击右键一次。目前这是我的功能，显示精灵。它处于while循环中，仅在用户退出时退出，因此不断被调用。

if( velocity < 0 )
{
    //Set the animation to left
    status = FOO_LEFT;

    //Move to the next frame in the animation
    frame++;
}
//If Foo is moving right
else if( velocity > 0 )
{
    //Set the animation to right
    status = FOO_RIGHT;


        frame++;


}
    //If Foo is moving up
    else if(yvelocity<0)
    {
         //Set the animation to up
        status = FOO_UP;
        //Move to the next frame in the animation
        frame++;
    }
    //If Foo is moving down
    else if (yvelocity>0)
    {
        //Set the animation to down
        status=FOO_DOWN;
        //Move to the next frame in the animation
        frame++;


    }
//If Foo standing
else
{
    //Restart the animation
    frame = 0;
}

//Loop the animation
if( frame >= 4 )
{
    frame = 0;
}

//Show the stick figure
if( status == FOO_RIGHT )
{

    apply_surface( offSet, yoffset, foo, screen, &clipsRight[ frame ] );
}
else if( status == FOO_LEFT )
{
    apply_surface( offSet, yoffset, foo, screen, &clipsLeft[ frame ] );
}
    else if(status== FOO_UP)
    {
         apply_surface( offSet, yoffset, foo, screen, &clipsUp[ frame ] );
    }
    else if (status == FOO_DOWN)
    {
        apply_surface( offSet, yoffset, foo, screen, &clipsDown[ frame ] );
    }