c# - Graphics.RotateTransform()在绘制图像后仍然存在

编写包含某些图形的WinForms应用。要旋转图像，请使用e.Graphics.RotateTransform（angle）方法，然后绘制图像。几行后，我调用e.Graphics.RotateTransform（0），这样我旋转的其他图像就不会出现，应该看起来是正常的。但是，情况并非如此，看来我以后绘制的所有内容都受相同的Transforms的影响。为什么RotateTransform（0）不能将页面的“转换”重置为正常状态？

注意：这是我的代码中_Paint事件产生的作用，但这是问题所在。我尝试包括任何可能相关的内容

e.Graphics.TranslateTransform(Chute1Rect.Width / 2 + Chute1Rect.X, Chute1Rect.Height / 2 + Chute1Rect.Y);

            if (increasing) //Chute is rotating out of the way
            {
                e.Graphics.RotateTransform(chuteAngle);

                e.Graphics.TranslateTransform(-1 * (Chute1Rect.Width / 2 + Chute1Rect.X), -1 * (Chute1Rect.Height / 2 + Chute1Rect.Y));
                e.Graphics.DrawImage(ChuteRotating, Chute1Rect);

                //These statements do not seem to be resetting the graphics drawing by the time we do the trains
                e.Graphics.TranslateTransform(Chute1Rect.Width / 2 + Chute1Rect.X, Chute1Rect.Height / 2 + Chute1Rect.Y);
                e.Graphics.RotateTransform(0);
            }
            else    //Chute is rotating into load position
            {
                if (chuteAngle == 0)    //Chute has rotated into load position
                {
                    e.Graphics.TranslateTransform(-1 * (Chute1Rect.Width / 2 + Chute1Rect.X), -1 * (Chute1Rect.Height / 2 + Chute1Rect.Y));

                    //Getting here means that the chute can be lifted & lowered because we are rotated down
                    if (lifting) //Chute is lifting out of the way
                    {
                        Chute1SlideRect.Y -= chuteDistance;
                        Chute2SlideRect.Y -= chuteDistance;

                        e.Graphics.DrawImage(ChuteSlide, Chute1SlideRect);
                        e.Graphics.DrawImage(ChuteSlide, Chute2SlideRect);
                    }
                    else    //Chute is lifting into load position
                    {
                        Chute1SlideRect.Y -= chuteDistance;
                        Chute2SlideRect.Y -= chuteDistance;

                        e.Graphics.DrawImage(ChuteSlide, Chute1SlideRect);
                        e.Graphics.DrawImage(ChuteSlide, Chute2SlideRect);
                    }

                    e.Graphics.DrawImage(ChuteJoint, Chute1JointRect);
                    e.Graphics.DrawImage(ChuteJoint, Chute2JointRect);
                }
                else
                {
                    e.Graphics.RotateTransform(chuteAngle);

                    e.Graphics.TranslateTransform(-1 * (Chute1Rect.Width / 2 + Chute1Rect.X), -1 * (Chute1Rect.Height / 2 + Chute1Rect.Y));
                    e.Graphics.DrawImage(ChuteRotating, Chute1Rect);

                    //These statements do not seem to be resetting the graphics drawing by the time we do the trains
                    e.Graphics.TranslateTransform(Chute1Rect.Width / 2 + Chute1Rect.X, Chute1Rect.Height / 2 + Chute1Rect.Y);
                    e.Graphics.RotateTransform(0);
                }
            }
//Down below here is where the trains get drawn

最佳答案

MSDN docs对此没有明确说明，但似乎RotateTransform总是修改现有的转换矩阵，在这种情况下，RotateTransform(0)表示“不执行任何操作”，而不是“将旋转设为0”。尝试将其旋转到初始角度的相反方向。

编辑：或使用ResetTransform()（docs）使事情回到您开始的地方并从那里开始。