| 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)
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| Related commands |
| Bounds |
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Create a TRect value from top left and size values |
| Point |
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Generates a TPoint value from X and Y values |
| PointsEqual |
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Compares two TPoint values for equality |
| Rect |
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Create a TRect value from 2 points or 4 coordinates |
| TPoint |
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Holds X and Y integer values |
| TRect |
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Holds rectangle coordinate values |
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| Example code : Determine inside and outside points of a rectangle |
// Full Unit code.
// -----------------------------------------------------------
// You must store this code in a unit called Unit1 with a form
// called Form1 that has an OnCreate event called FormCreate.
unit Unit1;
interface
uses
Types, // Unit containing the PtInRect command
Forms, Dialogs;
type
TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm} // Include form definitions
procedure TForm1.FormCreate(Sender: TObject);
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;
end.
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| Hide 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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