Re: Grid with Dots

Hi Chris,

For painting dots grid you can:
1) Use a texture paint that you can use set as a background of your
scene. This is fastest implementation but it does not allow to change
the grid-size. For details, see a first few lines in:
mobility/designer2/flow/src/org/netbeans/modules/vmd/api/flow/visual/FlowScene.java

2) Extend a Scene class you are using and override its paint method and
draw your dots there. Be aware that painting an 2d-array dots could be
very slow when you have over 1000+ dots drawn on the scene.

Regarding MoveStrategies:
Unfortunately I do not have a test for it but here it is how it should work:
private int gridWidth = 32;
private int gridHeight = 32;
WidgetAction moveAction = ActionFactory.createMoveAction (new
MoveStrategy () {
    public Point locationSuggested (Widget widget, Point
originalLocation, Point suggestedLocation) {
        return new Point (suggestedLocation.x - suggestedLocation.x %
gridWidth, suggestedLocation.y - suggestedLocation.y % gridHeight);
    }
}, null);
myWidget.getActions ().addAction (moveAction);
// now the myWidget could be moved on the scene and its position will be
snapped to the grid

If you want to, you can look at the "visualweb" code but I think they
are not using grid-dots feature (I assume your are talking
"web/jsf/navigator" module).

Regards,
  David


Chris Palmer wrote:
> Hi David!
>
> All this helps a lot thank you! Besides the move strategies outlined.
> Visually drawing the dots on the scene is quite important as well. I
> was wondering if there was an example or if I should look at the
> visual web pack code.....
>
> Chris
>
> David Kaspar wrote:
>> Hi Chris,
>>
>> It really depends on what exactly should be the behaviour of
>> "grid-with-dots" functionality.
>>
>> 1) If you want to have widgets to align to a grid during their movement
>> then:
>> a) use a MoveAction created with your own MoveStrategy where you
>> calculate with your grid-size. For example see:
>> graph/lib/src/org/netbeans/modules/visual/action/SnapToGridMoveStrategy.java
>>
>> 2) If you want Widgets to be instantly aligned to a grid, then you
>> should implement an Layout interface and assign it to the scene or layer
>> widget. This makes the children Widgets to be alligned instantly.
>>
>> 3) If you want to allow users to move Widgets on a scene freely within a
>> grid then:
>> a) implement the 1. case,
>> b) when you add a new Widget to a scene, check/calculate correct
>> preferred location of the new Widget based on the grid-size,
>> c) when an user changes the grid height or width, then
>> change/recalculate new correct preferred locations of all Widgets.
>>
>> Regards,
>>   David
>>
>>
>> Chris Palmer wrote:
>>   
>>> Hello!
>>>
>>> I would like to implement a simple Grid Layout where the user can
>>> change the width and height of the grid and the widgets could snap to
>>> this grid.  So a grid 60 X 60 would reflect 60 little grid boxes.
>>>
>>> Would the visual web pack be the best example to look at?
>>>
>>> Chris
>>>
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