| Description |
The Bounds function creates a TRect rectangle value from Top, Left coordinates, and Width, Height size values.
It provides a useful alternative to the Rect function, where you must know the bottom and right coordinates rather than the rectangle size.
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| Related commands |
| 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 |
| PtInRect |
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Tests to see if a point lies within a rectangle |
| 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 : Create rectangles using Rect and Bounds |
// 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
Classes, // Unit containing the Bounds command
Types,
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
rectangle1, rectangle2 : TRect;
begin
// Set up the first rectangle using the Rect function
// Note that we override the Types version of Rect.
rectangle1 := Classes.Rect(Point(10, 60), Point(50, 80));
// Set up an identical 2nd rectangle using the Bounds function
rectangle2 := Bounds(10, 60, 40, 20);
// Display the top left and bottom right coords of each rectangle
ShowMessageFmt('Rectangle 1 coords = %d,%d,%d,%d',
[rectangle1.Left,
rectangle1.Top,
rectangle1.Right,
rectangle1.Bottom]);
ShowMessageFmt('Rectangle 2 coords = %d,%d,%d,%d',
[rectangle2.Left,
rectangle2.Top,
rectangle2.Right,
rectangle2.Bottom]);
end;
end.
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| Hide full unit code |
Rectangle 1 coords = 10,60,50,80
Rectangle 2 coords = 10,60,50,80
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