Terraria.Player.SlopingCollision C# (CSharp) Method

        public void SlopingCollision(bool fallThrough)
        {
            if (this.controlDown || this.grappling[0] >= 0 || (double)this.gravDir == -1.0)
                this.stairFall = true;
            Vector4 vector4 = Collision.SlopeCollision(this.position, this.velocity, this.width, this.height, this.gravity, this.stairFall);
            if (Collision.stairFall)
                this.stairFall = true;
            else if (!fallThrough)
                this.stairFall = false;
            if (Collision.stair && (double)Math.Abs(vector4.Y - this.position.Y) > 8.0 + (double)Math.Abs(this.velocity.X))
            {
                this.gfxOffY -= vector4.Y - this.position.Y;
                this.stepSpeed = 4f;
            }
            double num = (double)this.velocity.Y;
            this.position.X = vector4.X;
            this.position.Y = vector4.Y;
            this.velocity.X = vector4.Z;
            this.velocity.Y = vector4.W;
            if ((double)this.gravDir != -1.0 || (double)this.velocity.Y != 0.0100999996066093)
                return;
            this.velocity.Y = 0.0f;
        }