C# GDI+设置地图模式
我似乎在 C# 中实现 SetMapMode 时遇到一些问题。我不是 C# 专家，所以我看到错误并不感到太惊讶。即使认为编译没问题，DrawLine 也会抛出 InvalidOperationException。有什么想法吗？
[DllImport("gdi32.dll")]
static extern int SetMapMode(IntPtr hdc, int fnMapMode);
myPen = new Pen(Color.Black, 1);
formGraphics = envMap.CreateGraphics();
IntPtr hdc = formGraphics.GetHdc();
SetMapMode(hdc, 3); // MM_LOMETRIC
formGraphics.DrawLine(myPen, (2 * rect.Right - 60) - 15, 8, (2 * rect.Right - 60), 0);
formGraphics.DrawLine(myPen, (2 * rect.Right - 60), 0, (2 * rect.Right - 60) - 15, -8);
提前致谢
I seem to be having some problems with implementing SetMapMode in C#. Not an expert in C# so Im not too surprised that im seeing errors. Even thought the compilation is fine DrawLine throws InvalidOperationException. Any ideas ?
[DllImport("gdi32.dll")]
static extern int SetMapMode(IntPtr hdc, int fnMapMode);
myPen = new Pen(Color.Black, 1);
formGraphics = envMap.CreateGraphics();
IntPtr hdc = formGraphics.GetHdc();
SetMapMode(hdc, 3); // MM_LOMETRIC
formGraphics.DrawLine(myPen, (2 * rect.Right - 60) - 15, 8, (2 * rect.Right - 60), 0);
formGraphics.DrawLine(myPen, (2 * rect.Right - 60), 0, (2 * rect.Right - 60) - 15, -8);
Thanks in advance
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最接近的是在
Graphics对象上设置PageUnit。据我所知，没有与MM_LOMETRIC等效的东西，但有Millimeter。您可以将其与 ScaleTransform 结合起来以获得所需的效果。
The closest thing to that is setting the
PageUniton theGraphicsobject. From what I can see there is no equivalent toMM_LOMETRIC, but there isMillimeter.You could probably combine that with
ScaleTransformto get the desired effect.