GoDiagram for .NET 官方用户指南

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"GoDiagram UserGuide 是一份官方的使用指南，主要针对 GoDiagram for .NET、GoDiagram for .NET Compact Framework 和 GoDiagram for ASP.NET Web Forms。这份指南详细介绍了如何使用 GoDiagram 控件和类来构建交互式的图形图表，适用于 Windows Forms 和 ASP.NET 平台。" GoDiagram 是 Northwoods Software Corporation 开发的一款强大的图形引擎，主要用于创建和操作流程图和其他类型的图形界面。此用户指南详细阐述了在 .NET 环境下利用 GoDiagram 进行图形编程的各种技术和方法，包括以下几个核心知识点： 1. **GoDiagram 控件**：这是用于 Windows Forms 和 ASP.NET 的核心组件，它提供了一个可以绘制和交互的图形界面。开发者可以通过这个控件添加、移动、删除图形元素，以及处理用户的交互事件。 2. **互动式图形类**：GoDiagram 包含一系列类，这些类可以帮助开发者创建复杂的图形模型。这些类包括图形节点、连接线、布局算法等，允许用户自定义图形的外观和行为。 3. **Windows Forms 支持**：GoDiagramWin 提供了在 Windows 应用程序中创建图形界面的能力，使得开发者可以构建具有拖放、缩放、旋转等功能的流程图应用。 4. **.NET Compact Framework 集成**：GoDiagramPocket 版本专为嵌入式设备和移动平台设计，使得开发者可以在资源有限的环境下创建图形界面。 5. **ASP.NET Web Forms 整合**：GoDiagramWeb 支持在 Web 应用中实现图形界面的交互，让开发者可以构建在线的流程图编辑器或可视化工具。 6. **图形元素操作**：指南详细说明了如何创建、修改和管理图形元素，如节点（Node）、连接线（Link）、群组（Group）等，以及如何应用各种图形样式和属性。 7. **布局算法**：GoDiagram 提供了多种内置布局算法，如树形布局、力导向布局等，帮助自动调整图形元素的位置和布局，以达到理想的效果。 8. **事件处理和用户交互**：通过事件处理机制，开发者可以响应用户的点击、拖动等操作，实现图形元素的动态更新和数据绑定。 9. **图形序列化和持久化**：GoDiagram 支持将图形状态保存和加载，使得用户可以保存工作进度并在以后恢复。 10. **版权与许可**：虽然 GoDiagram 用户指南提供了丰富的示例和信息，但需要注意的是，其内容受版权保护，未经许可不得复制或分发。同时，指南中的描述并不意味着授予任何专利使用权或软件销售权。 GoDiagram UserGuide 是一个详尽的学习资源，无论是对初学者还是经验丰富的开发者，都能从中获取构建交互式图形界面所需的深入知识和实践指导。通过学习和应用这些知识，开发者可以高效地创建出功能强大的图形应用程序。

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GoDiagram User Guide

GoView has some useful methods for manipulating the selection: adding objects

to the selection and moving or copying or deleting the selected objects.

Collections

Go provides two principal kinds of collections of graphical objects: groups and

layers. Groups provide a way of making a single “object” out of other objects.

Layers are a way of viewing multiple collections of objects in a document.

GoGroup inherits from GoObject and implements IGoCollection, a collection

of. GoObjects. Since GoGroup itself inherits from GoObject, groups can

contain other groups, to any depth. An object that does not have a parent group

is called a “top-level” object. The objects in a group are often called its children.

IGoCollection, and thus GoGroup, includes methods or properties such as Add,

Remove, Contains, Clear, IsEmpty, ArrayCopy, Count, GetEnumerator, and

Backwards so that you can manipulate the contents of the group. You can use

the foreach construct to perform the iteration. Remember that when you are

iterating over the objects in a collection you cannot modify the collection. This

is true for all .NET collections.

GoGroup also provides default implementations of several GoObject methods

such as Paint, Pick, ComputeBounds, and OnBoundsChanged. These default

implementations typically iterate over all of the items in the collection, calling

the appropriate methods on each object.

Since GoGroup is a GoObject, each group has a Bounds property. The bounds

calculated by ComputeBounds are just the union of all of the child objects,

whose coordinates are independent of the group. Moving a group will normally

move all of the children; resizing a group will normally resize all of the children

proportionately.

Removing a group from a document effectively causes the group’s children to

disappear also.

GoLayer is a collection of top-level GoObjects held by a GoDocument. Layers

are just a way to organize the collection of objects owned by a document. Each

document starts off with one layer. You can add and remove layers from a

document. You can also change the order of the layers in a document, thereby

making potentially many objects all over the document appear in front of or

behind other collections of objects. Furthermore you can affect the visibility of

all of those objects in a layer all at once. Unlike GoGroup, GoLayer does not

extend GoObject, so one cannot have layers within layers. But GoLayer does

implement IGoCollection, so you can use those methods and properties for

manipulating the collection of objects in a layer.

Layers also support limiting user actions on the objects in the layer. Such

properties include AllowSelect

, AllowMove, and AllowDelete. For example,

you can organize a document so that one layer contains all of the objects that you

do not want the user to delete; this layer would have its AllowDelete property set

to false.

There is also a standard implementation of the IGoCollection interface: the

GoCollection class. You may find this useful when you need a collection of

GoObjects but don’t want to use GoSelection, GoGroup, or GoLayer.

Diagrams

One of the principal uses of Go is to make it easy to build applications where

users can see and manipulate diagrams (a.k.a graphs) of nodes (a.k.a. vertices)

connected by links (a.k.a. arcs or edges). Go provides this functionality with the

GoNode, GoPort and GoLink classes. Nodes are groups containing one or

more ports. Links are strokes that connect two ports. Most of the predefined

classes that you will use to represent your graphs or networks are subclasses of

these classes.

The following picture identifies the parts of two nodes connected by a link at two

ports.

Although the GoNode, GoPort, and GoLink classes are all subclasses of

GoObject, the basic aspects of being a node, a port, or a link are actually

embodied by the IGoNode, IGoPort, and IGoLink interfaces.

IGoLink provides properties for getting the IGoPorts at either end of the link.

IGoPort provides access to the IGoLinks that are connected to the port. The

members allow access to links (and therefore implicitly to the nodes that contain

the ports of those links) that are coming into the port or going out of the port,

under the assumption that links are directional. Or you can deal with the whole

collection of links in either direction at the port. IGoPort also provides members

for determining if the user can draw a link from one port to another port.

IGoNode provides access to the IGoPorts that the node contains, as well as to

the collections of links or nodes that those ports are directly connected to.

All three of these interfaces provide access to the GoObject that represents the

abstract node, port, or link. And all three interfaces (and GoDocument too)

provide two properties that allow you to associate a custom integer value and a

custom object with each node, port, or link, without having to subclass.

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