help detecting clicks on the line i have drawn

[mike9606]

I need to be able to detect or work out if the line has been clicked, i have an array of tpoint and am able to detect if clicks occured on the skelton path of the line, <br><br>however i'm unsure as to how to work out if the click occured between two tpoints on the line, ie i have point a and point b and a line is drawn between them how do i work out if there has been a click on the line drawn between a and b? and can i create a method so that the click will be automatically detected and methods called to determine if the click was on the line?

 

[VladimirA]

Hi! You can identify if click point lie in the <br>rectangle if do this:<br><br>&nbsp;&nbsp;&nbsp;&nbsp;------------------------------<br>&nbsp;&nbsp;&nbsp;&nbsp;¦&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;¦<br>&nbsp;P1 *&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;* P2<br>&nbsp;&nbsp;&nbsp;&nbsp;¦&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;¦<br>&nbsp;&nbsp;&nbsp;&nbsp;------------------------------<br><br>P1 and P2 - two points of line (P1=(x1,y1);P2=(x2,y2))<br>W - half width of this line;<br>no matter how this rectangle oriented on plane,<br>if You have point (x,y) then You can calculate<br><br>&nbsp;&nbsp;&nbsp;&nbsp;((x-x1)*(y2-y1)-(x2-x1)*(y-y1))^2<br>A= ---------------------------------<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(x2-x1)^2+(y2-y1)^2<br>if A above W*W then point(x,y) don`t hit to rectangle<br>else point(x,y) lie in given rectangle.<br>

 

[VladimirA]

Ups! <br>I missed second condition.<br><br>&nbsp;&nbsp;&nbsp;(x-x1)*(x2-x1)+(y-y1)*(y2-y1)<br>B= -----------------------------<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(x2-x1)^2+(y2-y1)^2<br><br>So if (B&gt;=0)and(B&lt;=1)and(A&lt;=W*W) then given point<br>hit to rectangle.