Using Graphics.DrawLine with List<Point>

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Hvid Hat - 14 Feb 2008 22:00 GMT

Hi

Is it somehow possible to call Graphics.DrawLine with List<Point>? Does it
only take Point arrays? If so, how can I (easily) convert my List<Point>
to a Point array[]

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Peter Duniho - 14 Feb 2008 22:22 GMT

> Is it somehow possible to call Graphics.DrawLine with List<Point>? Does
> it only take Point arrays? If so, how can I (easily) convert my
> List<Point> to a Point array[]?

Have you tried calling the List<>.ToArray() method?

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Hvid Hat - 14 Feb 2008 22:43 GMT

Hello Peter,

>> Is it somehow possible to call Graphics.DrawLine with List<Point>?
>> Does it only take Point arrays? If so, how can I (easily) convert my
>> List<Point> to a Point array[]?
>>
> Have you tried calling the List<>.ToArray() method?

Hah! I'm new to generic lists so didn't expect it to be so easy. Thanks

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Peter Duniho - 14 Feb 2008 22:58 GMT

>>> Is it somehow possible to call Graphics.DrawLine with List<Point>?
>>> Does it only take Point arrays? If so, how can I (easily) convert my
[quoted text clipped - 3 lines]
>
> Hah! I'm new to generic lists so didn't expect it to be so easy. Thanks!

You're welcome.

That said, if you are surprised that they haven't added a DrawLines()
overload that takes an IList<Point>, or IEnumerable<Point> or something
like that, I wouldn't blame you. :) Seems like a silly oversight to me.
You _should_ be able to just pass a List<> instance to some version of
DrawLines(), rather than having to convert to an array.

Pete

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Ignacio Machin ( .NET/ C# MVP ) - 15 Feb 2008 12:56 GMT

Hi,

>>>> Is it somehow possible to call Graphics.DrawLine with List<Point>?
>>>> Does it only take Point arrays? If so, how can I (easily) convert my
[quoted text clipped - 11 lines]
> You _should_ be able to just pass a List<> instance to some version of
> DrawLines(), rather than having to convert to an array.

I do not think this will every happen :(.
Cause how many methods there are in the framework that expect an Array , all
of those methods would be candidates to get a overload with List<T> , as
long as you can convert a List<> to Array it's good enough.

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Peter Duniho - 15 Feb 2008 23:35 GMT

>> That said, if you are surprised that they haven't added a DrawLines()
>> overload that takes an IList<Point>, or IEnumerable<Point> or something
[quoted text clipped - 6 lines]
> all of those methods would be candidates to get a overload with List<T>
> , as long as you can convert a List<> to Array it's good enough.

Well, except for the fact that it could in fact be a performance burden.

You may be right that it's too sweeping a change for Microsoft to feel
it's worth doing. But they _do_ have a variety of other things that they
do that require sweeping changes. If anything, that's one of the things a
company with their resources can be very good at. :)

Pete

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Using Graphics.DrawLine with List<Point>

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