c# - How can i use mouse down click event and paint event of windows forms Chart control to draw points on the chart? -

i added start point end point , mouse x , mouse y variables want use them draw points on chart control when clicking mouse on left button.

but want points draw on chart area , when mouse inside square area in chart not draw point on squares borders lines or outside chart control area.

and display when moving mouse in squares in chart show me axis x , axis y values on labels.

the left axis 1 120 present time , bottom axis 1 30 present days. if move mouse in first square area should show me day 1 time 112 or day 2 time 33.

that's why i'm not sure spaces in axis x , axis y right. should 1 120 , 1 30 think every square should present inside 3 days , 120 time in jumps of 1 steps of 1 when move mouse can see in first squares day 1 time 3 or day 3 time 66 next row of squares present days 4 6.

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.linq; using system.text; using system.threading.tasks; using system.windows.forms; using system.windows.forms.datavisualization.charting;  namespace test {     public partial class form1 : form     {         private point startpoint = new point();         private point endpoint = new point();         private int mousex = 0;         private int mousey = 0;          public form1()         {             initializecomponent();         }          private void chart1_mousedown(object sender, mouseeventargs e)         {             if (e.button == mousebuttons.left)             {                 mousex = system.windows.forms.cursor.position.x;                 mousey = system.windows.forms.cursor.position.y;                 chart1.invalidate();              }         }          private void chart1_paint(object sender, painteventargs e)         {             graphics g1 = this.creategraphics();             pen linepen = new pen(color.green, 1);             pen ellipsepen = new pen(color.red, 1);             startpoint = new point(mousex, mousey);             endpoint = new point(mousex, mousey);             g1.drawline(linepen, startpoint, endpoint);             g1.drawellipse(ellipsepen, mousex - 2, mousey - 2, 4, 4);             linepen.dispose();             ellipsepen.dispose();             g1.dispose();         }     } } 

the way code now, points it's drawing far out of chart control area.

that's because using wrong mouse coordinates. replace these lines

mousex = system.windows.forms.cursor.position.x; mousey = system.windows.forms.cursor.position.y; 

with this:

mousex = e.x; mousey = e.y; 

the system.windows.forms.cursor.position returns coordinates of mouse using form base, while mouseeventargs returns coordinates of mouse using control raised event base.