How to move a curve by mouse movement?

7 replies
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I want to implement a function: after the mouse click on the curve to be able to drag the curve until the mouse is released

TouchGFX

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Martin KJELDSENBest answer

Principal III

Forgot to mention. In your call to moveTo(x,y) you would ofcourse juse use the current y-coordinate of the graph so that you don't move the graph accidentally in the y axis, but only in the x axis.

And consider relative coordinates and consider edges, so, actually, you would use deltaX - Forget what i said earlier.

graph.moveTo(deltaX, graph.getY());

Because deltaX can be negative.

/Martin

Martin KJELDSEN

Principal III

Hi @Zwei.9,

Just override handleDragEvent() in your view and use deltaX argument of the drag event to move your graph. This will work using your mouse in the simulator.

/Martin

Zwei.9Author

Associate III

Hello.@Martin KJELDSEN

I overrided handleDragEvent() in my view.

void MainWindowView::handleDragEvent(const DragEvent& evt)
{
 graph.moeTo(20+evt.getDeltaX(),20+evt.getDeltaY());
}

When I run it and drag the curve, it wobbles a lot.What's the reason?

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