Solved

Print Problem

Posted on 2000-05-10
3
163 Views
Last Modified: 2010-04-04
I want to print out a bitmap and some text(code as follows),but if the computer installed more than one printer,and I selected different printers to test printing,the result of printing will be different,sometimes the bitmap is big and sometimes small. I wonder what's the problem exists.

if (PrintDialog1.Execute) then
        begin
         Printer.BeginDOC;
         Printer.Canvas.TextOut(1000,100,'Headlines');
         DrawImage(Printer.Canvas,Rect(Left,400,Bmp_Width+Left,Bmp_Height+500),Image1.Picture.Bitmap);
         Printer.Canvas.Font.Size:=15;
          for i:= 0 to Part_Count-1 do
              Begin
          Printer.Canvas.Textout(600,800+Bmp_Height+i*100,Part_Name[i]);
          Printer.Canvas.Textout(1400,800+Bmp_Height+i*100,Current_Colors_Name[i]);
              End;
         Printer.EndDOC;
        end;
0
Comment
Question by:ws1999
3 Comments
 
LVL 10

Expert Comment

by:Lischke
ID: 2796415
The result of the print depends on the printer's resolution. This is the number of points it can print in a certain area. This resolution is often given in DPI (dots per inch). Cheaper printers support only 300 dpi, while good laser printers can do 600, 800 or even more.

Since you are giving pixels it is clear that the same amount of pixels takes more or less room on different resolutions.

Ciao, Mike
0
 
LVL 5

Expert Comment

by:TheNeil
ID: 2804052
Mike is right and to solve your problem use Stretchdraw and then base the parameters for it on the dimensions of the page.

rW := Printer.PageWidth / bmp.Width;
rH := Printer.PageHeight / bmp.Height;

IF rW > rH
THEN
  rW := rH
ELSE
  rH := rW;

iWidth := ROUND(bmp.Width * rW);  
iHeight := ROUND(bmp.Height * rH);

Printer.Canvas.StretchDraw(RECT(0, 0, iWidth, iHeight), bmp);


The Neil =:)
0
 

Accepted Solution

by:
SERENNE earned 100 total points
ID: 2806441
To solve the problem, you must use the printer resolution where you want to print. Here are my routines to do this :


// x scale convertion: Vertpix in dpi, Value in 0,01 mm
// result in printer dots
function x(VertPix:integer;Value:Integer):Integer;
begin
     Result:=Trunc(Value*(VertPix /254));
end;

// y scale convertion:  Horzpix in dpi, Value in 0,01 mm
// result in printer dots
function y(HorzPix:integer;Value:Integer):Integer;
begin
     Result:=Trunc(Value*(HorzPix /254));
end;


// print and adjust with printer resolution
procedure MyForm.Print;
var
    VertPix,HorzPix:integer;

if (PrintDialog1.Execute) then
begin
       // Get then printer resolution in Dpi
       VertPix:=GetDeviceCaps(Printer.Handle,LOGPIXELSY);
       HorzPix:=GetDeviceCaps(Printer.Handle,LOGPIXELSX);

       Printer.BeginDOC;
       Printer.Canvas.TextOut(x(HorzPix,1000),y(VertPix,100),'Headlines');
DrawImage(Printer.Canvas,Rect(Left,400,x(HorzPix,Bmp_Width+Left),y(VertPix,Bmp_Height+500)),Image1.Picture.Bitmap);
       Printer.Canvas.Font.Size:=15;
       for i:= 0 to Part_Count-1 do
       Begin
   Printer.Canvas.Textout(x(HorzPix,600),y(HorzPix,800+Bmp_Height+i*100),Part_Name[i]);
                                  Printer.Canvas.Textout(x(HorzPix,1400),y(VertPix,800+Bmp_Height+i*100),Current_Colors_Name[i]);
       End;
      Printer.EndDOC;
end;

The print result will be the same on different printers.
Enjoy!
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Have you ever had your Delphi form/application just hanging while waiting for data to load? This is the article to read if you want to learn some things about adding threads for data loading in the background. First, I'll setup a general applica…
Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

821 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question