小编use*_*299的帖子

如何使用鼠标滚轮进行缩放,我试试这个

        if (currentMouseState.ScrollWheelValue < originalMouseState.ScrollWheelValue)
        {
            cameraPosition += new Vector3(0, -1, 0);
            UpdateViewMatrix();
            currentMouseState.ScrollWheelValue.Equals(0);
        }
        if (currentMouseState.ScrollWheelValue > originalMouseState.ScrollWheelValue)
        {
            cameraPosition += new Vector3(0, 1, 0);
            UpdateViewMatrix();
            currentMouseState.ScrollWheelValue.Equals(0);
        }

但即使我滚动一次,我仍然继续放大,我对XNA有点新意.请帮忙.