vb.net - How do I get my Windows Forms drawn user control to resize larger without clipping? -


i in process of creating own user control in windows forms application using vb.net, , having change in size along form containing it. looks okay long window size stays constant , control stays within original bounds. however, if resize window make larger, control's contents resize end getting clipped @ original size. unsure coming , have not found way far fix it.

below quick sample code user control can reproduce problem i'm having:

thecircle.vb:

public class thecircle     private _graphics graphics      public sub new()         ' call required designer.         initializecomponent()         ' add initialization after initializecomponent() call.         _graphics = creategraphics()         setstyle(controlstyles.resizeredraw, true)         backcolor = color.red     end sub      private sub thecircle_paint(sender object, e painteventargs) handles me.paint         _graphics.fillrectangle(brushes.blue, clientrectangle)         _graphics.fillellipse(brushes.limegreen, clientrectangle)     end sub end class

i place user control after rebuilding project in main form , either dock or anchor (same result, latter helps better show clipping issues are). , below screenshot of result when attempt resize control beyond "default" size:

imgur

the green ellipse , blue "background" rectangle should occupy entire control area, aren't (it's clipped , see red backcolor instead). looks behaves intended though when control @ original size or smaller. how can fix this? i'm pretty new gdi+, i'm sure must right under nose...

this unnecessary, , bad idea: _graphics = creategraphics()

it's bad because it's volatile. one-time graphics object, draw it, , next refresh cycle, it's lost unless keep doing it.

the proper approach use paint event, supplies graphics object in painteventargs , called every time re-paint required. can ask re-paint @ point in code calling thecircle.invalidate() (or refresh() more immediate redraw).

public class thecircle      public sub new()         ' call required designer.         initializecomponent()         ' add initialization after initializecomponent() call.         setstyle(controlstyles.resizeredraw, true)         backcolor = color.red     end sub      private sub thecircle_paint(sender object, e painteventargs) handles me.paint         e.graphics.fillrectangle(brushes.blue, clientrectangle)         e.graphics.fillellipse(brushes.limegreen, clientrectangle)     end sub end class

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