QGraphicsRectItems

privatepepper

Hello,
So I am trying to visualize the pathfinding algorithms on qt. How could I make that user could select the starting point and the endpoint with his mouse on the QGraphicsRectItems and I would receive which rectangles were selected?

mrjj

Hi
You mean drag out a rect and then all QGraphicsRectItems within that area are selected ?
You can use https://doc.qt.io/qt-5/qrubberband.html
for the drag a rect effect

Alternatively, the user can already select multiple objects if holding down CTRL and left-clicking.

privatepepper

@mrjj said in QGraphicsRectItems:

Hi
You mean drag out a rect and then all QGraphicsRectItems within that area are selected ?

No, I mean that when a window is opened first two clicks would change QGraphcisRectItems
color and I could store information which QGraphcisRectItems were "selected" .

Opens a window
Selects a starting point
Selects an endpoint

And I somehow store those points

SGaist

Hi,

You can do it from several different techniques.

For example, you can make your items selectable and use the QGraphicsScene::selectionChanged signal.

You can implement the mousePressEvent method to manage the selection yourself and also update the item colour.