Class inheritance diagram in JavaScript

In this post we will show how to use the JavaScript diagram library to generate a class inheritance diagram. The complete example is available here:

InheritanceDiagram.zip

and a live version here:

http://mindfusion.eu/demos/jsdiagram/Inheritance.html

Let’s start by creating shortcuts to some classes from the diagram model:

var Diagram = MindFusion.Diagramming.Diagram;

var DiagramItem = MindFusion.Diagramming.DiagramItem;
var DiagramLink = MindFusion.Diagramming.DiagramLink;
var DiagramNode = MindFusion.Diagramming.DiagramNode;
var ShapeNode = MindFusion.Diagramming.ShapeNode;
var TableNode = MindFusion.Diagramming.TableNode;
var ContainerNode = MindFusion.Diagramming.ContainerNode;
var FreeFormNode = MindFusion.Diagramming.FreeFormNode;
var SvgNode = MindFusion.Diagramming.SvgNode;

var ScrollBar = MindFusion.Diagramming.ScrollBar;
var Rect = MindFusion.Drawing.Rect;
var Font = MindFusion.Drawing.Font;
var TreeLayout = MindFusion.Graphs.TreeLayout;

Next, create a function that takes a Diagram instance and a list of class names as parameters. It will create a TableNode for each class. Each property of the class prototype is listed in a TableNode cell. If the getBaseType function detects a class inherits another one from the list, we’ll create a link between their nodes. Finally, the diagram is arranged using the TreeLayout algorithm.

function createClassDiagram(diagram, classes)
{
    var classConstructors = [];

    // create a table node for each class
    for (var i = 0; i < classes.length; i++)
    {
        var className = classes[i];
        var node = diagram.getFactory().createTableNode(20, 20, 42, 42);
        node.redimTable(1, 0);
        node.setText(className);
        node.setBrush("white");
        node.setCaptionBackBrush("lightgray");
        node.setCaptionFont(
            new Font("sans-serif", 3, true /*bold*/, true /*italic*/));
        node.setScrollable(true);

        var ctor = eval(className);
        for (var property in ctor.prototype)
        {
            node.addRow();
            node.getCell(0, node.rows.length - 1).setText(property);
        }
        classConstructors.push(ctor);
        ctor.classNode = node;
    }
	
    // create a diagram link for each prototype inheritance
    classConstructors.forEach(function(ctor)
    {
        var base = getBaseType(ctor);
        if (base && base.classNode)
        {
            var link = diagram.factory.createDiagramLink(
                base.classNode,
                ctor.classNode);
            link.setHeadShape(null);
            link.setBaseShape("Triangle");
            link.setBaseShapeSize(3);
        }
    });

    // arrange as a tree
    var treeLayout = new TreeLayout();
    treeLayout.linkType = MindFusion.Graphs.TreeLayoutLinkType.Cascading;
    diagram.arrange(treeLayout);
}

The getBaseType implementation checks if a class was registered as a base for the argument using MindFusion.registerClass method or the common prototype inheritance pattern.

function getBaseType(ctor)
{
    // if class registered using MindFusion.registerClass
    if (ctor.__baseType)
        return ctor.__baseType;

    // if  prototypical inheritance with Child.prototype = new Parent()
    if (ctor.prototype && ctor.prototype.constructor != ctor)
        return ctor.prototype.constructor;
	
    return null;
}

The ready handler creates a Diagram instance binding it to a #diagram canvas element. It then calls createClassDiagram with a list of DiagramItem -derived classes as argument:

$(document).ready(function ()
{
    TableNode.prototype.useScrollBars = true;
    ScrollBar.prototype.background = "Lavender";
    ScrollBar.prototype.foreground = "DarkGray";

    // create a Diagram component that wraps the "diagram" canvas
    var diagram = Diagram.create($("#diagram")[0]);

    createClassDiagram(diagram,
    [
        "DiagramItem",
        "DiagramLink",
        "DiagramNode",
        "ShapeNode",
        "TableNode",
        "ContainerNode",
        "FreeFormNode",
        "SvgNode"
    ]);
});

If you run the sample now, you should see this nice visualization of MindFusion classes 🙂

JavaScript class inheritance diagram

For more information on MindFusion JavaScript diagram library, see its help reference and overview page.

Enjoy!

A Monthly Calendar in Java With Events and Recurring Appointments

This is a step-by-step guide that teaches you how to:

  • Setup the MindFusion Scheduler for Java library to display a single
    month calendar.
  • Attach and handle an event when the user clicks a calendar cell.
  • Create and setup recurrent events/appointments.
  • Perform custom drawing on a specific cell.

The sample builds a monthly calendar, which responds to a user click on a calendar cell by creating a recurrent appointment. The appointment is repeated on each subsequent day of the week for unlimited number of months.

When the user selects a given calendar cell (the 6th day of the month), a special icon appears. The icon is rendered using custom drawing.

Note: In this tutorial we use the words “appointment” and “event” interchangeably. Let’s start:

1. How to Setup the Calendar

All packages of the calendar are included in a single *.jar file – JPlanner.jar In our sample we will reference the following packages:

import com.mindfusion.common.*;
import com.mindfusion.common.Rectangle;
import com.mindfusion.drawing.*;
import com.mindfusion.drawing.awt.AwtImage;
import com.mindfusion.scheduling.*;
import com.mindfusion.scheduling.awt.*;
import com.mindfusion.scheduling.model.*;

For detailed reference about the packages and the classes of the schedule library check the online help.

Here are the first settings for our schedule:

  calendar = new AwtCalendar();
  calendar.beginInit();
  //set the current time
  calendar.setCurrentTime(DateTime.now());
  DateTime today = DateTime.today();
  //set the current date
  calendar.setDate(today);
  // Select the current date
  calendar.getSelection().set(DateTime.today());

We create a new calendar and signal that initialization starts. The time and date shown at the application start are the current date and time. We also select the cell with the current date.

Let’s make the calendar show exactly one month:

calendar.setCurrentView(CalendarView.SingleMonth);

By default each cell in a single month view has its header size set to 0, which makes the current date show in the center of the cell. As a consequence any events in the cell won’t have space to be rendered.

Java Scheduler: the header takes all the cell's height

Java Scheduler: the header takes all the cell’s height

Since we plan to create appointments on user click, we must push the header to the top and free cell space for drawing the events. This is very easy to do, just set:

calendar.getMonthSettings().getDaySettings().setHeaderSize(20);

Now the header is 20 px. and the rest will be for our appointments.

Java Scheduler: the header is 20px.

Java Scheduler: the header is 20px.

For now we are ready initializing the calendar.

calendar.endInit();

2. Handling User Clicks.

User clicks are handled with the dateClick event. We need an instance of the CalendarAdapter and there we associate the dateClick event with a method – onDateClicked. The event is fired when a date is selected.

 calendar.addCalendarListener(new CalendarAdapter(){
            public void dateClick(ResourceDateEvent e) {
                onDateClicked(e);
            }

        });

3. Create an Appointment and a Recurrence.

The first part of our event handler method is:

protected void onDateClicked(ResourceDateEvent e) {

    int dayIndex = e.getDate().getDayOfWeek();

    Appointment item = new Appointment();
    item.setStartTime(e.getDate());
    item.setEndTime(e.getDate());
    item.setHeaderText(events[dayIndex]);
    item.getStyle().setBrush(brushes[dayIndex]);

Here we create an Appointment and set its start and end date to the date which was clicked. The ResourceDateEvent keeps data about the date, the resource, if any and other useful information. The header text is the text, which will be rendered at the appointment. The style object contains appearance data for the cell and we use the setBrush
method to change the background of the appointment.

The second part of the method creates the Recurrence object:

      recurrence = new Recurrence();
      recurrence.setPattern(RecurrencePattern.Weekly);
      recurrence.setDaysOfWeek(getDayOfWeek(dayIndex));
      recurrence.setStartDate(e.getDate());
      recurrence.setRecurrenceEnd(RecurrenceEnd.Never);
      item.setRecurrence(recurrence);

The recurrence is once a week. There’s additional work to be done when we set the day of the week with setDaysOfWeek. The method accepts as an argument one of the DaysOfWeek enumeration values and we have to convert the index of the day to such value.

private int getDayOfWeek ( int i ) {

        switch (i) {
            case 1:
                return DaysOfWeek.Monday;
            case 2:
                return DaysOfWeek.Tuesday;
            case 3:
                return DaysOfWeek.Wednesday;
            case 4:
                return DaysOfWeek.Thursday;
            case 5:
                return DaysOfWeek.Friday;
            case 6:
                return DaysOfWeek.Saturday;
        }

        return DaysOfWeek.Sunday;

    }

Finally, let’s add the item with the recurrence pattern to the schedule items collection:

 calendar.getSchedule().getItems().add(item);

4. Custom Drawing a Cell’s Header

The last thing that needs to be done is to draw the icon on the special 6th day of each month. We will perform item drawing and we add to the calendar initialization code this line:

 calendar.setCustomDraw(CustomDrawElements.CalendarItem);

Now we are ready to handle the draw event:

   //add a listener for custom draw
       calendar.addCalendarListener(new CalendarAdapter()
        {
            @Override()
            public void draw(DrawEvent e) {
                onDraw(e);
            }
        });

Below is the first part of the handler method:

 private void onDraw(DrawEvent e)
    {
 if(e.getDate().getDay() == 6 )
            {
                java.awt.Image img = null;

                try {
                    // Read the image file from an input stream
                    InputStream is = new BufferedInputStream(
                            new FileInputStream("../cake.png"));
                    img = ImageIO.read(is);

                } catch (IOException ioe) {
                }

Here we read an image from an InputStream. The calendar method for drawing images requires mindfusion.scheduling.AwtImage and we must convert the java image:

AwtImage awtImage = new AwtImage(img);

Then we get the bounds of the drawing area and render the image:

   //gets the bounds of the drawing area
    Rectangle r = e.getBounds();
             
   //draw the image
   e.getGraphics().drawImage(awtImage, e.getBounds().getLeft(), e.getBounds().getTop(), 32, 32);

 }

The image is 32 x 32 pixels and gets clipped in the appointment.

Java Scheduler: the appointment's height is not enough.

Java Scheduler: the appointment’s height is not enough.

We’ll have to resize the item header to give it more space:

calendar.getItemSettings().setSize(32);

And now everything works just fine:

MindFusion Java Calendar: Month View with Events

MindFusion Java Calendar: Month View with Events

The sample is available for download from here:

Monthly Calendar in Java with Recurrent Appointments and Events

About Scheduling for Java Swing: A programming class library written entirely in Java that lets you build the most sophisticated schedules, calendars and task managers fast and easy. The component boasts a comprehensive feature set that includes custom-typed events, undo/redo functionality, scrolling, tool tips and much more. You can choose among six view styles, which are easy to change and customize. The appearance of each schedule is completely customizable and supports themes, user-assigned mouse cursors and a variety of font, pen and brush options.

A detailed list with the features of the tool is available at the Scheduling for Java Swing features page. The trial version includes a variety of samples and you have plenty of sample code to study. Online documentation with useful tutorials is also available.

The library is royalty-free, source-code is also available. You can see a list of the current prices here. Check the discount page for a list of the available discounts.

Diagramming for JavaScript, V2.5

The new release of MindFusion Diagramming library for JavaScript contains some useful new features and improvements. Below are the details:

Resize of table columns and rows

Columns and rows of a TableNode can now be resized interactively if its AllowResizeColumns or AllowResizeRows properties are enabled. In order to resize, move the mouse pointer to the border line on column’s right side or row’s bottom side until it shows resize cursor and start dragging. The control raises tableColumnResizing and tableRowResizing events to let you validate new size or prevent resizing some elements. The tableColumnResized and tableRowResized events are raised after the operation completes.

JavaScript Table Nodes: Resize

JavaScript Table Nodes: Resize

Shape libraries

The ShapeLibrary class lets you use custom geometric shapes created using MindFusion ShapeDesigner tool. Call its loadFromXml method to load a library XML file. getShapes returns an array of the loaded Shape objects. The ShapeLibraryLocation property of NodeListView creates a prototype ShapeNode object for each shape from the specified library.

Miscellaneous

  • TextStroke and TextStrokeThickness properties of DiagramItem let you set color and thickness of text outlines.
  • Items can now be deleted using Backspace key when running on Mac.
  • Caption divider line in TableNode and ContainerNode is now rendered clipped when caption height is smaller than corner radius.
  • The TooltipDelay property specifies the delay in milliseconds before showing tooltips.
  • The Orientation property of NodeListView lets you set the view’s orientation to Horizontal or Vertical .
  • MindFusion.Common.js contains code shared with other JavaScript libraries by MindFusion. It must be loaded before the MindFusion.Diagramming.js script.

Fixed bugs

  • Fixed overlaps in TreeLayout when arranging nodes of different sizes.
  • Anchor points indices were not serialized and could be reset to different values when loading from JSON.
  • Deserialization of custom item classes worked correctly only if their names contained Node or Link suffix.

Registered customers with an active upgrade subscription can download the licensed version from the clients area on our site.

A trial version is available for direct download from the following link:

Download MindFusion Diagramming Library for JavaScript, V2.5

We are glad to receive any comments, suggestions and feedback. You can write us at e-mail support@mindfusion.eu or use the help desk. You can use the JsDiagram section on MindFusion forum to post questions about the tool.

About Diagramming for JavaScript Library: Written 100% in JavaScript, this tool uses HTML5 Canvas to draw impressive diagrams, schemes, flowcharts, trees and many more. It is browser independent, easy to use and integrate into any web application. JsDiagram supports a variety of predefined node shapes, customizable links, rich event set and many appearance options.

The user interaction model includes resizing / moving / selecting and modifying any diagram element. The tool boasts an elegant API, which is documented in details as well numerous step-by-step guides and tutorials. Various samples are provided to let you learn quickly how to use the most important features of the library – check them here. JsDiagram is not only the perfect choice for creating any type of diagram in the browser – it can also arrange it the way you wish with a mouse click using one of its automatic graph layout algorithms. For more details about the features of the component, please visit the Diagram for JavaScript page.

Diagramming for Java Swing, V4.1.4 Released

MindFusion is happy to announce the new version of the Java Diagramming library. The release offers useful new features and improvements.

What’s New in Version 4.1.4

Resize table columns and rows

Columns and rows of a TableNode can now be resized interactively if its AllowResizeColumns or AllowResizeRows properties are enabled. In order to resize, move the mouse pointer to the border line on column’s right side or row’s bottom side until it shows resize cursor and start dragging. The control raises tableColumnResizing and tableRowResizing events to let you validate new size or prevent resizing some elements. The tableColumnResized and tableRowResized events are raised after the operation completes.

Java Diagram Library: Table Nodes

Java Diagram Library: Table Nodes

License keys

There is no separate trial build of the control’s JAR archive provided anymore. Instead, call the setLicenseKey method of DiagramView to disable the component’s evaluation mode and stop displaying trial messages. setLicenseKey > is static and you can call it just once before creating any views. License key strings are now listed on the Keys & Downloads page at MindFusion’s customer portal.

Miscellaneous

  • Undo/redo records for in-place edit operations are now created automatically.
  • KeepInsideDiagram constraint prevents a node from leaving diagram boundaries during user interaction (the older RestrictItemsToBounds property does not stop nodes from leaving diagram area but returns them to original position if dropped outside).
  • Dashed selection frames are now drawn in two colors and should be visible on both the default white background and custom darker backgrounds. You can change the second dash color via DashBackground property of HandlesVisualStyle.
  • Improved mouse capture for composite controls hosted inside ControlNodes.
  • StartPoint and EndPoint properties provide a shortcut to setting the first and last control points of a DiagramLink.

Fixed bugs

  • Fixed text clipping problem when magnifier is over TreeViewNode.
  • Links to contained nodes were left visibly disconnected from them after deleting a folded ContainerNode.
  • Lasso selection could not select strictly horizontal or vertical straight-line links when IncludeItemsIfIntersect is disabled.

The trial version is available for download from the following link:

Download MindFusion.Diagramming for Java Swing, V4.1.4 Trial Version

Technical support
MindFusion puts special effort in providing high quality technical support to all its clients and evaluators. You can post your questions about Diagramming for Java or any other of our components at the forum, help desk or at support@mindfusion.eu. All support inquiries are usually answered within hours of being received.

About Diagramming for Java Swing: MindFusion.Diagramming for Java Swing provides your Java application with all necessary functionality to create and customize a diagram. The library is very easy to integrate and program. There are numerous utility methods, rich event set, more than 100 predefined shapes. The tool supports a variety of ways to render or export the diagram, advanced node types like TreeView nodes, hierarchical nodes, tables, container nodes and many more. There are 15 automatic layouts, various input / output options and fully customizable appearance. A detailed list with JDiagram’s features is uploaded here. You can check the online demo to see some of the functionality implemented.

Diagramming for Java Swing is royalty free, there are no distribution fees. Licenses depend on the count of developers using the tool – check here the prices.

MindFusion Diagram Component for Xamarin Beta Version

MindFusion is pleased to announce the first release of its Diagramming component for Xamarin. The control is packed with a comprehensive set of features that allows programmers to create, modify and render various types of diagrams fast and easy.

Among its core features are table and container nodes, tree nodes, shape library with a rich choice of predefined node shapes, diagram links with various arrowhead styles and different connector types – Bezier, straight, polyline.

Each Xamarin diagram you build with the component is fully interactive – users can drag, move, resize, create and delete all types of nodes and links. The control fires events for the tiniest user gestures so your software can perform the necessary operations as a result. The event set includes every single action – from editing a link to deleting a node.

The chart’s appearance is fully customizable. Each element of the diagram exposes its complete set of style settings like brush, pen, font, which give you full control over its looks. You can apply glass and aero visual effects for glossier look.

You can organize content in layers for better visualization and use a grid for more precise location and alignment of diagram elements. Ready flowcharts can be quickly persisted into XML with the call of a single method.

We invite you to test the initial MindFusion Diagramming for Xamarin Release. Direct download is available from this link:

Download MindFusion Flowchart Component for Xamarin Beta Version

The download includes a sample project and detailed API reference.

Your questions, comments and feedback are welcomed. Use email support@mindfusion.eu or write at our discussion board. Either way we’ll be glad to receive and answer your feedback!

MindFusion Diagram control for Xamarin

MindFusion Diagram control for Xamarin