Canvas draw vertical line on form/de: what changed
Revision 0 to 1. Removed lines have a minus sign; added lines have a plus sign.
Title: Canvas draw vertical line on form/de
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| 1 | + | Zurück zur Seite [[code examples/de|Code Beispiele]]. | |
| 2 | + | ||
| 3 | + | Das Unterprogramm zeigt, wie mit Canvas auf einem [[TForm/de|Formular]] eine vertikale Linie gezeichnet wird. | |
| 4 | + | ||
| 5 | + | ``` pascal | |
| 6 | + | uses | |
| 7 | + | Forms, Graphics, ...; | |
| 8 | + | ||
| 9 | + | ... | |
| 10 | + | ||
| 11 | + | procedure subVertikaleLinie(Form: TForm; w32X, w32Y : LongWord; bytStrich: Byte; w16Farbe: Word); | |
| 12 | + | // Alle Zahlen und Berechnungen sind in Pixel | |
| 13 | + | begin | |
| 14 | + | ||
| 15 | + | with Form do | |
| 16 | + | begin | |
| 17 | + | // Legt den Punkt fest, ab dem das Zeichnen beginnt | |
| 18 | + | Canvas.MoveTo(w32X, w32Y); | |
| 19 | + | // Legt die Farbe des Strichs fest | |
| 20 | + | Canvas.Pen.Color := w16Farbe; | |
| 21 | + | // Legt die Breite des Strichs fest | |
| 22 | + | Canvas.Pen.Width := bytStrich; | |
| 23 | + | // Zeichnet einen Strich | |
| 24 | + | // Parameter: | |
| 25 | + | // LineTo(Länge ab dem Startpunkt, Abstand zur Oberen Formularkante) | |
| 26 | + | Canvas.LineTo(Width - w32X, w32Y); | |
| 27 | + | end; | |
| 28 | + | ||
| 29 | + | end; | |
| 30 | + | ||
| 31 | + | ... | |
| 32 | + | ``` | |
| 33 | + | ||
| 34 | + | Wenn dieses Unterprogramm im Ereignis OnPaint des Formulars eingetragen wird, wird die Linie bei jeder Formularänderung neu gezeichnet. | |
| 35 | + | ||
| 36 | + | Beispiel: | |
| 37 | + | ||
| 38 | + | ``` pascal | |
| 39 | + | uses | |
| 40 | + | Forms, Graphics, ...; | |
| 41 | + | ||
| 42 | + | ... | |
| 43 | + | ||
| 44 | + | procedure TForm1.FormPaint(Sender: TObject); | |
| 45 | + | begin | |
| 46 | + | // Parameter für das Unterprogramm: | |
| 47 | + | // Formularname, X-Startkoordinate, Y-Startkoordinate, Strichbreite, Farbe | |
| 48 | + | subVertikaleLinie(Form1, 10, 50, 2, clred); | |
| 49 | + | end; | |
| 50 | + | ||
| 51 | + | ... | |
| 52 | + | ``` | |
| 53 | + | ||
| 54 | + | --- | |
| 55 | + | *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](/wiki-contact).* |
