Canvas draw vertical line on form/de
Zurück zur Seite Code Beispiele.
Das Unterprogramm zeigt, wie mit Canvas auf einem Formular eine vertikale Linie gezeichnet wird.
uses
Forms, Graphics, ...;
...
procedure subVertikaleLinie(Form: TForm; w32X, w32Y : LongWord; bytStrich: Byte; w16Farbe: Word);
// Alle Zahlen und Berechnungen sind in Pixel
begin
with Form do
begin
// Legt den Punkt fest, ab dem das Zeichnen beginnt
Canvas.MoveTo(w32X, w32Y);
// Legt die Farbe des Strichs fest
Canvas.Pen.Color := w16Farbe;
// Legt die Breite des Strichs fest
Canvas.Pen.Width := bytStrich;
// Zeichnet einen Strich
// Parameter:
// LineTo(Länge ab dem Startpunkt, Abstand zur Oberen Formularkante)
Canvas.LineTo(Width - w32X, w32Y);
end;
end;
...Wenn dieses Unterprogramm im Ereignis OnPaint des Formulars eingetragen wird, wird die Linie bei jeder Formularänderung neu gezeichnet.
Beispiel:
uses
Forms, Graphics, ...;
...
procedure TForm1.FormPaint(Sender: TObject);
begin
// Parameter für das Unterprogramm:
// Formularname, X-Startkoordinate, Y-Startkoordinate, Strichbreite, Farbe
subVertikaleLinie(Form1, 10, 50, 2, clred);
end;
...From the Free Pascal wiki, page "Canvas draw vertical line on form/de", as it stood on 2020-02-10 after a change by Trev, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's Licensing page. If you have concerns about this material, message the admin.
Edited on wiki.freepascal.org by 4 people, 2013–2020
From the official wiki's backup of 26 May 2024: who edited this page there, and when. Edits made there after that date were not recorded, and the earlier versions are not shown here; the main page says why.
| When | Who | What changed |
|---|---|---|
| Olaf | Created page | |
| Olaf | (minor) | |
| Olaf | (minor) | |
| Olaf | (minor) | |
| Olaf | (minor) | |
| Michl | ||
| FTurtle | ||
| Trev | Fixed syntax highlighting; deleted category already in page template (minor) |
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