I need help - I can help - TQuickPDF0813.DrawText

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TQuickPDF0813.DrawText

Printed From: Debenu Quick PDF Library - PDF SDK Community Forum
Category: For Users of the Library
Forum Name: I need help - I can help
Forum Description: Problems and solutions while programming with the Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=2074
Printed Date: 21 Sep 24 at 4:19AM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: TQuickPDF0813.DrawText

Posted By: micha
Subject: TQuickPDF0813.DrawText
Date Posted: 18 Dec 11 at 3:48PM

hello,

im using delphi 7

when using the DrawText function the text is drawn over the y position

does anyone know how to draw the text under the y position ?

thanks micha

Replies:

Posted By: Ingo
Date Posted: 18 Dec 11 at 8:15PM

Hi Micha!

Perhaps it's better to post the used code-snippet.
If you're asking about orientation you should use SetOrigin.
Please read here:
http://www.quickpdflibrary.com/help/quickpdf/SetOrigin.php

Cheers and welcome here,
Ingo

Posted By: AndrewC
Date Posted: 19 Dec 11 at 10:04PM

Text is a PDF file is drawn on the baseline. If you want to draw text from the top of the font cell or the top of the characters then you would use either GetTextHeight or GetTextAscent

QP.SetOrigin(1);

QP.DrawLine(30, 30, 400, 30);

QP.DrawText(30, 30 - QP.GetTextHeight(), "Hello World using text height");

QP.DrawLine(30, 60, 400, 60);

QP.DrawText(30, 60 - QP.GetTextAscent(), "Hello World using ascent");

Posted By: edvoigt
Date Posted: 20 Dec 11 at 2:31PM

Hi Micha,

Here an overview on the properties around Textheight:

To have text of different size readable in a line, all is drawn on the baseline. It's so in Word, in PDF and it makes sense. But inside a technical drawing, you may want a spezial alignment and so you need some calculations around size. You may get all information by GetTextAscent, GetTextDescent, GetTextBound(...), GetTextHeight, GetTextWidth. But keep in mind, that SetTextSize works ever with points.

Here a codesnippet for the above painting in D7:

var
QP: TQuickPDF;
s: string;
x, y,
tf, ta, td, tt, th, ts, tw: double;
begin
QP := TQuickPDF.Create;
QP.UnlockKey(...
QP.SetMeasurementUnits(1);      // millimeters
QP.SetPageDimensions(210, 297); // DIN A4
QP.SetOrigin(0);                // bottomleft
x := 20; y := 20;
s := 'Ä happy ÉgÊ¦Ç';           // to have real things on all lines

QP.AddStandardFont(11);         // as you like
tf := 24*72/25.4;               // 24 mm as points
QP.SetTextSize(tf);
ta := QP.GetTextAscent;         // get all we can need
td := QP.GetTextDescent;
tt := QP.GetTextBound(2);
th := QP.GetTextHeight;
ts := QP.GetTextSize*25.4/72;   // points to mm
tw := QP.GetTextWidth(s);
QP.DrawText(x, y, s);

tf := 4*72/25.4;                // 4 mm as points
QP.SetTextSize(tf);

QP.SetLineWidth(0.1);
QP.SetLineColor(1, 0, 0); // Baseline
QP.DrawLine(x-10, y, x+tw+5, y); QP.DrawText(x+tw+6, y, 'Baseline');
QP.SetLineColor(0, 1, 0);      // Ascent
QP.DrawLine(x-10, y+ta, x+tw+5, y+ta); QP.DrawText(x+tw+6, y+ta, 'Ascent');
QP.SetLineColor(0, 0, 1);      // Descent = abs(Bottom)
QP.DrawLine(x-10, y+td, x+tw+5, y+td); QP.DrawText(x+tw+6, y+td, 'Descent');
QP.SetLineColor(0, 0.5, 0.5); // Top
QP.DrawLine(x-10, y+tt, x+tw+5, y+tt); QP.DrawText(x+tw+6, y+tt, 'Top');

QP.AddStandardFont(4);
QP.SetTextSize(tf);
QP.DrawText(x, y-10, Format('Ascent=%.2f Descent=%.2f Top=%.2f Textsize=%.2f Delta=%.2f',[ta, td, tt, ts, tt-ta]));

Cheers,

Werner