DelphiBasics
PtInRect
Function
Tests to see if a point lies within a rectangle Types unit
 function PtInRect ( const TheRectangle : TRect; const ThePoint : TPoint ) : Boolean;
Description
The PtInRect function returns true if ThePoint lies within TheRectangle.
 
Note that the rectangle inside is defined as:
 
(left, top, right-1, bottom-1)
Related commands
Bounds Create a TRect value from top left and size values
Point Generates a TPoint value from X and Y values
PointsEqual Compares two TPoint values for equality
Rect Create a TRect value from 2 points or 4 coordinates
TPoint Holds X and Y integer values
TRect Holds rectangle coordinate values
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Example code : Determine inside and outside points of a rectangle
var
  myRect : TRect;

begin
  // Create a rectangle
  // Note : The rectangle inisde starts at top left, but ends
  //        1 pixel inside bottom right.
  myRect := Rect(20, 30, 100, 200);

  // Check to see if (20,30) is inside the rectangle
  if PtInRect(myRect, Point(20,30))
  then ShowMessage(' 20, 30 is  inside the rectangle')
  else ShowMessage(' 20, 30 is outside the rectangle');

  // Check to see if (99,199) is inside the rectangle
  if PtInRect(myRect, Point(99,199))
  then ShowMessage(' 99,199 is  inside the rectangle')
  else ShowMessage(' 99,199 is outside the rectangle');

  // Check to see if (100,200) is inside the rectangle
  if PtInRect(myRect, Point(100,200))
  then ShowMessage('100,200 is  inside the rectangle')
  else ShowMessage('100,200 is outside the rectangle');
end;
Show full unit code
    20, 30 is  inside the rectangle
   99,199 is  inside the rectangle
   100,200 is outside the rectangle
 
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