Moveable Graphic Object? tutorials
in [VB.NET]
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From: Tom Shelton on 19 Mar 2010 13:47 On 2010-03-18, Bob S <BobS(a)discussions.microsoft.com> wrote: > I am looking at a project which will require me to venture into some > new territory. I have been searching the net and appear to have not > hit on the correct keywords to find what I am looking for. > > I need to write an application which draws objects on a canvas, but I need > the objects to remain objects so they could be moved around. Basically the > same sort of functionality found in Visual Studio Design mode where I can > pull a button out of the toolbox and after it has been placed, move it to > somewhere else. > > Looking at the generated code, I see how buttons are created and positioned > and I suppose that trapping mouse down on the button and then looking at > motion events could allow me to move the object around. I suspect that there > is > support for doing that somewhere, but I have not found the correct set of > keywords to hit on it. Most of the stuff I have found on GDI objects and > graphics objects have dealt which drawing things on a canvas and then > "there they are there they stay". > > Any pointers on where to look would be appreciated. > > If I have not provided enough detail on what I am attempting to accomplish, > this application will be simliar to a gant chart program. The data objects > will > be generated from data with size being related to duration and coloration > being > related to the type of activity. These objects will be moved to one or more > timelines. Assorted cross checking will be done when the object is placed. > Snap to grid type granularity would also be nice. > > Thank you for your time. > Chris pointed you to an article that explained a bit about creating your own retained mode graphics system around GDI/GDI+. Might I point out though, that WPF already is a retained mode graphics system? Hittesting, etc, etc, already built in... Just another alternative. -- Tom Shelton |