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how can I manage an image with an edit box

Hi
1.-  I have I figure, like a circle with numbers from 0 to 360 degrees ( like a clock ).
2.-  Edit box will display the value choosed in the part 1.
so the question is how Can I do a figure that moving with the mouse I can select a number and after
number is displayed in an edit box.  
Any help for this,
Thanks
Guerra
0
guerra
Asked:
guerra
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1 Solution
 
peter_vcCommented:
The trick here is to use the OnMouseMove event.
Using the centre point of the image and simple trig, you can determine the angle of the imaginary line that connects the centre of the image to the current mouse position.  In the OnClick event, you set the contents of the edit box to the calculated angle.
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guerraAuthor Commented:
Hi Peter-vc
I droped an image I don't know  what to do next,
if you've got some examples, can I have a look?
Thanks
Guerra
0
 
peter_vcCommented:
Here is 15 points worth of examples.


unit Unit1;

interface

uses
  SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
  Forms, Dialogs, ExtCtrls, StdCtrls;

type
  TForm1 = class(TForm)
    Image1: TImage;
    Edit1: TEdit;
    procedure Image1MouseMove(Sender: TObject; Shift: TShiftState; X,
      Y: Integer);
    procedure Image1DblClick(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  Y_Coord : Integer;
  X_Coord : Integer;
  Image_Centre_X : Double;
  Image_Centre_Y : Double;

implementation

{$R *.DFM}

procedure TForm1.Image1MouseMove(Sender: TObject; Shift: TShiftState; X,
  Y: Integer);
begin
     X_Coord := X;
     Y_Coord := Y;
end;

procedure TForm1.Image1DblClick(Sender: TObject);
var
   TheAngle : Double;
begin
     { Calculate angle here using X & Y_Coord, Image_Centre_X & Y }
     { For now just show Y_Coord }

     TheAngle := Y_Coord;

     { display it }
     Edit1.Text := FloatToStr(TheAngle);

end;

procedure TForm1.FormCreate(Sender: TObject);
begin
     Image_Centre_X := Image1.Width;
     Image_Centre_X := Image_Centre_X / 2;

     Image_Centre_Y := Image1.Height ;
     Image_Centre_Y := Image_Centre_Y / 2;
end;

end.

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guerraAuthor Commented:
hi Peter
Thanks for the help, it is working, but could tell me how can i define the centre of the image, because the image takes the values from 0 at the top, the same for the width.
Thanks
guerra
0
 
peter_vcCommented:
Look at the code (FormCreate event).  The centre is half the width and half the height.
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