As there are a number of points on the chart, these points together constitute a curve, how to get clicked point by clicking on the x y value

CodePudding user response:

Get the mouse at the interface between the x value, the date of the corresponding with you, and then take corresponding date y value on the curve,

CodePudding user response:

reference 1st floor u010227555 response:

to obtain the mouse at the interface between the x value, the date of the corresponding with you, and then take corresponding date y value on the curve,

can't direct selection point

CodePudding user response:

I just give you an idea, do you want to, you need to, when the mouse to click a point X, Y, then you have to let the program know which point your mouse point, so you need to get your mouse X value of current, and then to get points, Y value again, just thinking, do not know is not for you, or have a great spirit can provide a good answer,

refer to the second floor fenjiaogouzh77076 response:

Quote: refer to 1st floor u010227555 response:

To get the mouse at the interface between the x value, the date of the corresponding with you, and then take corresponding date y value on the curve,

not directly select a bit

CodePudding user response:

I said above, estimate the difficulty is to get the current mouse X value, this how have to you can go to check, as long as the X value, the rest is super easy,

CodePudding user response:

Void CChartCtrl: : OnLButtonDown (UINT nFlags, CPoint point)
{
SetCapture ();
If (m_bZoomEnabled)
{
M_bLMouseDown=true;
M_rectZoomArea. TopLeft ()=point;
M_rectZoomArea. BottomRight ()=point;
}

If (m_PlottingRect PtInRect (point))
{
TCursorMap: : iterator iter=m_mapCursors. The begin ();
For (iter. Iter!=m_mapCursors. End (); Iter++)
Iter - & gt; Second - & gt; onm ouseButtonDown (point);

Invalidate ().
}
/////add
Cstrings STR.
//string SSTR=(" point under the left key, the mouse is in x=% d, the location of the y=% d ", point, x, point, y);
//STR=_T (" point under the left key, the mouse is in x=% d, the location of the y=% d ", point, x, point, y);


SendMouseEvent (CChartMouseListener: : LButtonDown, point);
The CWnd: : OnLButtonDown (nFlags, point);
}
CChart inside a mouse click on the function, the inside of the point. The x, point. Y is the coordinates of the mouse to click, can according to the position of the mouse to click and curve location of conversion between curvilinear coordinates