I also have a particular dislike for decorating my classes with serialization and designer attributes. A slightly different screenshot as compared to the one at the top of the article -. Do I care? FlowSharp basically took several full weekend days and most weekday evenings to write. Find more information on finding resources at the Bodleian Libraries. There's a few rough edges to be worked out (having nothing to do with the excellent DockPanelSuite), however, things like persisting the layout configuration and saving (and loading!) So, say 120 hours. Secondly, you'll notice that groups can be nested. updating the shape's path (implemented by connector shapes), redrawing the affected shapes on the bitmap. Child shapes should not be selected. (BaseController.cs, CanvasController.cs, ToolboxController.cs). It's exactly what I was looking for to learn. FlowSharpMenuService - Handles actions related to menu selection. For more information, visit www.bodleian.ox.ac.uk. Refactor it now rather than later. It is natural to expect that all the mouse moves, starting from when the user clicks the shape, to when the user, after dragging the shape, releases the button -- all those mouse moves are actually accumulated into a single move action. Grouped children should not be selectable. Hovering over a grouped shape does not show anchors -- you cannot resize a shape once it's been grouped. This means we need to create new GUID's for the pasted shapes and remap the GUID's of the connectors so that they reference the newly pasted shapes, not their "source" shapes. I figured someone must have written a small, usable, documented package. Cool feature, works great, but how do you disconnect an anchor? The one example looks great, but there's a behind-the-scenes architecture that isn't documented and looks complex. ‘Run for your Light’ – the making of quantum technology, Prospective Continuing Education students, Prospective online/distance learning students. How to fix this defensively but without resulting in excessive sorting? Here, once the mouse moves into the rectangle defined by the diagonal connector, an additional test of how close the mouse is to the line is made to qualify whether the connector can be selected. we also have to ensure that any child groups are preserved. Bodleian Libraries. Not very complete, no virtual surface, I couldn't get connectors to work. FlowSharpCanvasService - Handles all canvas related operations. Custom line caps are a PITA. This required simulating mouse selection and mouse movement on the canvas' panel: Once you start dragging, the mouse cursor is moved over to the canvas and the shape appears: Notice in the above image that the selected shape in the toolbox is now indicated. After the 10/15 release, I discovered several bugs: At the moment, these have been corrected in the GitHub repo, I'll update the code download here soon. Keep a log or journal of must have additional requirements that evolve from the starting requirements. Back to the point--the way .NET draws endcaps for lines in the "negative" orientation appears to bugged (I don't discount the possibility that my tests had a bug though!) Hi Marc, is there an EXE available somewhere? Also notice how closures are used to preserve the state of the action. It offers a one-stop search and delivery solution for quickly accessing Oxford’s main library information resources regardless of type, format or location. The complexity increase in all the other parts of the code (including working around .NET exceptions) in order to simplify dynamic connector drawing doesn't seem justified. Sudden Sun Death Syndrome (SSDS) is a very real concern which we should be raising awareness of. I thought my PNG writer was not anti-aliasing until I realized that my viewer was auto-zooming the image to fit the display window! Because I kept adding it to the "selected" list. This is most likely because, instead of erasing all the selected shapes, moving them, then redrawing them, the code is currently moving each shape one at a time, resulting in a lot of unnecessary erase/redraws. As a result, this broke some code (which is good!) If not, connect the connector to the shape. If I draw these shapes from a clean slate, rather than loading them from a file, notice the dynamic connector has the right references: Oddly, this bug does not usually manifest as problem. Should base classes be put in a separate folder? And because the outer group contains the inner group, the outer group is last in the z-order (at least at this point.) Code organization:  Built in shapes should probably be organized in sub-folder to keep things clean, but then where do you put base classes? Best C# Article of October 2016 : First Prize. Once you start dragging, you can release the Shift or Ctrl key. Should the sub-folder only contain the concrete shape implementation? The initial set of elements is empty (there's some commented out code for starting with some elements which was helpful for testing.) Implementing grouping touched on just about every aspect of the FlowSharpLib code. FlowSharpCodeCompilerService - Provides compiler services for shape code-behind and code generation. that needed to now call the public FindAllIntersections method, revealing other areas (the paste code) where this bug was potentially affecting the rendering. This presented a minor technical challenge because I wanted the selection box (which is Box element) to work regardless of whether the user drew the selection region from the top-left down and right, or "inverted" in the X, Y, or both axis (for example, starting at the bottom-right and moving to the top-left.) Hier kannst Du Dich mit anderen Eltern und werdenden Müttern und Vätern über Vornamen und Elternthemen austauschen. Online-Einkauf mit großartigem Angebot im Software Shop. This requires refactoring the FindAllIntersections into two functions, since the process is recursive: Notice the recursive function is marked as private, so we don't accidentally use it outside of the controller class or in a derived controller class. The user should still be able to attach connectors to grouped shapes (as shown in the screenshot above). Fussing with endcap properties, I did figure out how to draw diamond endcaps: That particular discovery allowed me to add diamonds to the list of possible endcaps. Only one custom line cap (arrow) is provided by .NET. The only thing the GroupBox needs to be responsible for is moving the shapes contained within it. Here, the default canvas behavior is overridden: The controller is very simple -- click on a shape in the toolbox and it appears on the canvas as a selected shape. Personally, I think think this points to a "mild" design/implementation flaw, but the workaround in the code above is simple enough to get the job done for now. Most of these have to do with how connectors handle some UI behaviors. Thus FlowSharp was born. The complexity is a direct result of the fact that I chose not to implement a hierarchical list of elements, as discussed at the beginning. How Do The Steelers Clinch Playoff Berth: Jan 3, 2021 Cleveland Browns Beat Pittsburgh Steelers, Clinch Playoff Berth All Cleveland needed to do to win the game and head to the playoffs was Another useful feature, especially with FlowSharpCode, is the ability to navigate the selection history using Ctrl-Tab. This means you cannot invert a shape by moving the top-left corner of a shape below or to the right of the bottom or right edge. Because I use an absolute coordinate system, drawing components like the anchors is really easy: Now, granted, the use of extension methods, Linq, and anonymous methods potentially degrade performance -- it's an interesting tradeoff: code readability vs. performance. The most interesting part of this code is handling the question "is the mouse near the diagonal connector?". Does it need to be fully optimized? This is the code for when the mouse is hovering: I should have tested for a selected shape to begin with. No - I mean snapping anchors automatically to a nearby shape's connection point. In the above screenshot, the actions "Attach" and "ShapeMove" are a group (as well as "Attach" and "AnchorMove") -- the movement of a shape or anchor that resulted in a connector attaching to a shape. Above (earlier) we have the wrong order (left-up). Plug-ins are implemented very "cheaply" at the moment. If you just click on a toolbox shape, instead of dragging it onto the canvas, the shapes are now positioned next to each other instead of on top of each other: The above screenshot shows what the canvas looks like after clicking on the square, circle, and triangle. The user cannot move a grouped shape once it has been grouped. Keep a log of "would be nice to have" features, and prioritize them. The problem is that the controller is still using the wrong method, from which the private scope doesn't protect us: It's better to rename the recursive method: Now the compiler identifies the use cases (only one) where the wrong method is being called, and we can fix the problem: The erasure of the up-triangle, being in front of the left-triangle, is now correct. I've been wanting a Visio-like diagramming tool for a long time (for some interesting ideas I have, but that's another story.) My original "move everything" code, which occurs when you drag the canvas itself, looked like this: Not bad, but notice what MoveElement does: This is great for moving a single element -- it finds all the intersecting shapes, erases them, moves the desired shape, and then redraws them all. Besides creating hidden side-effects which are difficult to debug, it also makes implementing certain behaviors like undo/redo a nightmare which will force you, if you want to do it right, rewriting potentially vast sections of the code. How do quantum physicists affect industry? Because those are the same as a connector's endpoints, we use the connector's connection points rather than going through hoops to figure out the actual point on the anchor that represents the "tip" of the connector. The reason for these minimums is to still show (as the left shape illustrates) the anchor points. Turtles??? Diagonal connectors are now supported. Notice the trail left on the triangle "3". Heck no, and the optimized version is probably less readable. Contributions are welcome, and if you want to contribute, please fork the GitHub repo here and submit pull requests. Introduction. I started noticing some strange behaviors, so I implemented a tree view of the shapes and their connections. Docking is implement using DockPanelSuite and is managed by the Clifton.DockingFormService asembly (the source code for which is found in the Clifton GitHub repo.) This of course required modifying a bunch of methods to iterate through the selection list for the drag operations. that passing unit tests do not guarantee a bug free application. In the code, I call things "elements", but in the article, I call them "shapes." The Snap method updates this value when a snap occurs. Annoyingly, there are a handful of methods in a couple base classes that are just stubs for the sole purpose of "inversion of control" - allowing the derived class to do something special. The undo/redo stack operates on the principle of passing in an actions for the do (and redo) operation as well as the undo operation. Intersected shapes, which are not moving, have a default "grow" factor of 0. This is a useful feature for when you know you want to work with several shapes - you just click on what you want repeatedly in the toolbox, then move them around on the canvas. Thanks for detailed article, works like a charm. XXX movies in full length 1080p for each category. Here's why. When implementing undo/redo, it is critical that actions are not entangled -- they need to be discrete activities that are managed by the top level user event handlers -- in this case, keyboard and mouse events, which is why the code examples above show how the UndoStack is utilized in the MouseController class. Got some code smell? Because more than one shape had the same ID! Bewerte Namen. In the SnapCheck method, the element is either moved based on the user's mouse movement or by the amount the Snap method determined is necessary to actually make the connection: (GraphicElement.cs, DynamicConnector.cs, Line.cs), (The UpdateSelectedElement event is fired so that the property grid can be updated with the new position information.). Not having a virtual surface was a major show stopper for me. SOLO (Search Oxford Libraries Online) is the main search engine for library collections across Oxford, providing access to information in over 100 Oxford libraries including circa eight million bibliographic records and more than 13 million item records. ), The state, that dragging shapes has been enabled (which is set by the mouse down route on the condition that a shape is selected. If you don't believe in magic, use the base class (or derive from it for your own special magic): In other words, the toolbox is itself a canvas: So, obviously you can copy and paste between instances of FlowSharp as well as copy&paste within the same instance. Credit: Rob Judges. You can't serialize these things directly, so each shape has an ID and everything has to be wired back up on deserialization. I didn't really want to go there, so I'm paying the "penalty" for that in how the dynamic connector works. The problem was created when I changed the deserializer (see Copy & Paste below) to assign new GUID's. VS2015 is required, but the code can also be built referencing .NET 4.5. Regions for the connectors are bigger than necessary. Font size changes that exceed the boundaries of the shape (not handled), Font size changes that make the text shape grow beyond it's original background (handled), Border line width (probably handled, not sure). Further information on all University libraries can be found using the 'Libraries A-Z' or ‘Subjects A-Z’ indexes. When creating a groupbox, it should be inserted in the z-order right after the bottomost child being grouped. The user experience with grouped shapes requires some consideration: This required some minor modifications of the mouse controller, for example, preventing anchors from showing over grouped shapes: And preventing grouped shapes from being selected: Z-ordering, particularly moving a grouped shape up/down the z-order, took a lot of thinking as to how to do it. Try to remember that all those graphic objects need to be disposed! Why does a mouse click also fire a mouse move event with 0 change in location??? Let's see what happens when we adjust the endcap: Notice we still have the same problem, but now there's artifact in the endcap -- a white line! The code could still be further cleaned up for this bad habit. Ideally, I'd like to drag the toolbox shape to the canvas, as that is the typical process after selecting the shape: dragging it somewhere. In this case, there is no "Do" action because all the actions have already been performed. The world’s large rivers have been intensely studied to better understand the impact of climate change and direct human interventions on river water quality and quantity. We would like to show you a description here but the site won’t allow us. Is that a bug? The various code pieces to support FlowSharpCode are now implemented as services (see above diagram): To "activate" the FlowSharpCode features, the module FlowSharpCodeModules.xml is specified as a parameter to FlowSharp.exe. We value excellent academic writing and strive to provide outstanding essay writing service each and every time you place an order. This is by far the most complicated code in the CanvasController. and copying the bitmap regions to the screen. This code: fixes the problem -- when dragging the canvas, the user now experiences a beautifully smooth operation! Members of the public can explore the collections via the Bodleian’s online image portal at digital.bodleian.ox.ac.uk or by visiting the exhibition galleries in the Bodleian’s Weston Library. You cannot create a diagonal line. ): Enabling the group select feature resulted in the discovery of how interesting the user experience needs to be. An excellent tool and a great writeup. As we respond to a changing climate, how humanity will cope and thrive in this uncertain future has never been more important. The salient point is #5 - the shape does not deselect unless you haven't initiated dragging. This error in mixing "can I do this" with "and if I can, do it" was ultimately the source of much gnashing of teeth. FlowSharp was built with Visual Studio 2015 and references .NET 4.6.1. I've looked but haven't found one. The primary reason for refactoring the code is so that FlowSharp becomes extensible without touching the code base. Use meaningful names for everything. ), (In writing this, I improved the object model and removed some custom toolbox handling that was no longer necessary, eliminating 80 lines of code, and adding some code for additional shapes, so the above is just a snapshot of a particular point in time.). Why? Every College has its own library, often consisting of a modern, working library and older collections. FlowSharpDebugWindowService - Handles the debug window notifications and user actions. Using the keyboard's "down" to move a connector: Not in snap range             In snap range                   closer....                   snapped! By dragging the toolbox shape, additional mouse movement and a mouse click would be avoided, however I haven't implemented that yet. By default, all it does is this: In order to optimize the drawing of a shape, any time it's moved, any intersecting elements also have to be erased. This affects the persistence code. Notice the z-order of the shapes: The "left" triangle is underneath the "up" triangle. Bug (fixed): Copy and paste of a groupbox faults. Tune in and listen to the sounds of Oxford's most famous libraries. FlowSharpToolboxService - Handles the toolbox. The canvas handles its background grid and calls the CanvasPaintComplete Action<> method that the controller must set for the canvas. Deserialization is more complicated because the connection points need to be wired up to their actual objects: Connectors implement serialization/deserialization for the data that they manage: and lastly, when the connection objects are all deserialized, a final fixup is required to wire up the actual shape object from the shape ID: Because there's no actual input control, keyboard operations in the FlowSharp UI project have to be intercepted by overriding ProcessCmdKey: is initialized with keyboard actions that can be performed on a selected shape: Note that DragSelectedElement also does a snap check. A bookmarked shape is indicated by a small green square at the top left of the shape's display rectangle. Note how CopyToScreen copies only the region of our internal bitmap to the affected region on the screen. Why? The current implementation was becoming a kludge of "if" statements. In fact, drawing the lines for a dynamic connector is complicated. Connector "snap" behavior needs to drill into groups. This is important because I want to prototype some other concepts where a diagramming tool is important, and I don't want to integrate Visio and the other open source diagramming tools I looked at didn't meet my needs. This image comes from Oxford University Images, the sounds of Oxford's most famous libraries, finding resources at the Bodleian Libraries, Bodleian Libraries strategy, policies and reports. I don't have to touch the connector "snap" behavior, as I don't need to drill into grouped shapes to see if a connector should snap to an inner shape. The connection points (little blue X's that don't show up well on diamonds) appear when a connector's anchor gets close to a shape. A very common thing to do is to get the active canvas controller: Refer to the assembly FlowSharpServiceInterfaces, specifically interfaces.cs, to see what methods are exposed in each service. Bug (fixed): Connector from outside of group to a grouped child does not preserve connection to child when group moves. I found these three: NShape - .Net Diagramming Framework for Industrial Applications. Oxford University is at the forefront of the UK’s efforts to build the first generation of quantum computers with world-leading performance. The Bodleian Libraries at the University of Oxford is the largest university library system in the United Kingdom. Connection points not hiding after mouse is release after connecting a connector and moving away from connector's anchor. In one instance, the Text shape, I completely override the rendering of the default shape: The difference is that in the toolbox, the element is drawn with a big letter "A", but the actual element defaults to a smaller font and the text "[enter text]". of the entire shape. Also it is throwing some exceptions. Recall that in the single element deserializer, the GUID was reassigned: Easy-peasy. A line is drawn based on the DisplayRectangle of the shape, for example: The movement of an anchor is constrained by the type of anchor that you select: As the above code shows, corner anchors and dynamic connector Start and End grip types are not constrained. In the screenshot at the start of this section, while it looks hierarchical, that is purely something the debug tree setup does -- it only looks that way, you'll still see the child shapes as top-level items in the list. [05/06/2020] Les cas confirmés sont désormais cumulés avec les cas ehpad confirmés. The light grey rectangles are a fun "switch" you can turn on in the code that shows the region being updated. So why is the "left" triangle being seen as above the "up" triangle? You'll notice I changed the toolbox layout a bit and added some triangle shapes from the previous screenshots. Implementing this led me to rework the whole way that mouse events (down, up, motion) are handled. It is the second largest in the UK after the British Library. At least that's what I thought. This doesn't happen why I move either of the two triangles individually: Here we have the correct order: up-left. If a hierarchical collection of shapes is implemented: Moving the groupbox in the z-order is trivial, I really don't have to touch the implementation there. Writing this really helped me identify what I consider to be good development practices: Yes, IEnumerable.ToList() does have a performance impact, it is an O(n) operation though it will likely only require attention in performance critical operations.