How to use Gantt chart layers and filters

Gantt Chart （Xgantt） from 1998 The first commercial version of the year was devoted to the research and development of control for planning and project management , after 20 Years of accumulation and precipitation , At present, it can provide software developers and end users with top-level planning and project management control products , Help users quickly integrate the Gantt chart needed by project management software , Network diagram , Resource histogram , Calendar , Resource scheduling and other functional modules , And provide a full range of support and services .

VARCHART XGantt Is a powerful Gantt chart control , Its modular design allows you to create applications that meet your needs .XGantt Can be used for .NET,ActiveX and ASP.NET Applications , Can quickly 、 Simply integrate into your application , Help you identify performance bottlenecks 、 Avoid delays and efficient use of resources , Make complex data easier to understand .

Do you know how we use VARCHART XGantt Develop a series of powerful visual planning applications ？ If you follow all the steps , So now you'll have a fairly comprehensive Gantt Applications ： You have installed our .NET Gantt Control , Already using the sample library , Data has been loaded into the control , You know how to change time units and modify time ranges , And it's possible to construct Gantt charts by creating groups （ As mentioned in the previous blog post ）.

Using the layer

A layer is a graphical representation of a pair of dates . Besides , The same pair of dates can be displayed on multiple layers . logically , Different layers are stacked in a pile .
In our example , We will now create another layer that looks different .
1. stay “ object ” On the property page , choice “ Layers ...”. Will pop up “ Specify the appearance of the bar ” Dialog box . You will notice Task The layer has been created .

2. Create a new layer by clicking the appropriate button Button_Create_New .

3. Now you have to modify the new layer . So , Please click on the “ New layer ”, And then click Button_Edit2 .“ Editing layer ” The dialog will open .

4. Please put “ shape ” Change to down arrow ,“ background ” Change the color to yellow .

1. By clicking “ determine ”, You will return to “ Specify the appearance of the bar ” Dialog box .

2. If you click the preview column of the corresponding field , Then each layer of the node will be displayed in the preview below . The red triangle instead of the green triangle means that the layer is displayed in the preview window below .

3. In our programming example , Changes to the definition show the following results ：

Use filters

Next , We want only if the node is a milestone （ That is, the duration of the activity is equal to 0） The yellow arrow is displayed only when .
Using filters can easily solve this problem . A filter consists of a series of link conditions , These conditions lead logically to / No sentence .

Layers are always linked to filters . Only if the evaluation result of filter condition is “ yes ” when , The corresponding layer is visible . By default, filters assigned to layers always return “ yes ”. For our example , You need two filters , Each filter contains a condition ：

?? If it lasts = 0, A yellow arrow will appear
?? If it lasts > 0, A blue bar will appear

1. stay “ object ” Property page   On , single click “ filter ” Button , This will pop up “ Manage filters ” Dialog box .
2. Now? , Please create two new filters by clicking    Button_Create_New.
3. In the name column ,  take “ NewFilter” and “ NewFilter1” Rename it to “ Milestone” and “ Activity”.
4. Please click on the “ application ” Confirm the change   .

1. Select filter “ Milepost ”, Then click to open the dialog “ Edit filter ” Button_Edit2 .

2. choice “ The duration of the ” As the field name , Selection operator “ be equal to ” And choose the comparison value 0

1. Click OK to exit the dialog box .

2. choice “ Activities ”, Then click again to go to “ Edit filter ” Dialog box .

3. choice “ The duration of the ” As the field name , Put the operator “ Greater than ” Select as the comparison value 0.

1. Click OK to confirm .

1. Click OK to close the dialog box , then   Return to the property page .

2. In order to put the filter into operation , It needs to be assigned to layers . So , Please click on the “ layer … ” Button to turn on “ Specify the appearance of the bar ” Dialog box .

1. If you run the program now , And the duration of the first activity is set to 0, The results are as follows ：