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After printing A4 and B5, the size of the output waveform does not change.

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Post time: 2020-1-26 17:00:01
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I put the waveform on PaintBox, how can I make the printed waveform size unchanged when A4 and B5 change? The following program changes the waveform size after A4 and B5 are changed.
void PrintImage (TPaintBox * SRE)
{
   Printer ()-> Canvas-> StretchDraw (
      Rect (SRE-> Left * Printer ()-> PageWidth / Panel1-> Width,
           SRE-> Top * Printer ()-> PageHeight / Panel1-> Height,
           (SRE-> Left + SRE-> Width) * Printer ()-> PageWidth / Panel1-> Width,
           (SRE-> Top + SRE-> Height) * Printer ()-> PageHeight / Panel1-> Height),
      SRE-> Picture-> Graphic);
}
PaintBox is placed on Panel1.
How do I change to meet the above requirements?
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Post time: 2020-2-21 13:00:01
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Calculating a fixed ratio using B5 paper should be fine
Do not use Printer ()-> PageHeight directly

BTW:
Printer using StretchDraw may fail
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 Author| Post time: 2020-7-23 22:00:01
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 Author| Post time: 2020-7-23 22:15:01
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Are there any experts who comment?
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 Author| Post time: 2020-8-11 12:30:01
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Worry, no one asked
The printer may fail to use StretchDraw, so how can I change it?
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Post time: 2020-8-11 23:30:01
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void Print_Bitmap(TCanvas *lpCanvas, TRect rectDest, Graphics::TBitmap *lpBitmap)
{
    DIBSECTION DibSec;
    GetObject(lpBitmap->Handle, sizeof(DibSec),&DibSec);

    StretchDIBits(lpCanvas->Handle,
        rectDest.Left, rectDest.Top,
        (rectDest.Right-rectDest.Left), (rectDest.Bottom-rectDest.Top),
        0, 0,
        lpBitmap->Width, lpBitmap->Height,
        DibSec.dsBm.bmBits,
        (BITMAPINFO*)&DibSec.dsBmih,
        DIB_RGB_COLORS,
        SRCCOPY);
}
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 Author| Post time: 2020-8-12 13:45:01
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starburg: How to use this, can you elaborate on it?
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Post time: 2020-8-12 19:00:02
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Proportional problem
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Post time: 2020-8-12 19:15:02
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If you want to ensure that the absolute size printed on the paper is unchanged, you need to obtain the printer's
The output resolution is good, and it can generally be calculated like this:
(1)Printer()->PageHeight
            ->PageWidth
   Get the length and width points of the page size, Canvas press this unit
(2)DPIx=GetDeviceCaps(Printer()->Handle,LOGPIXELSX)
   DPIy=GetDeviceCaps(Printer()->Handle,LOGPIXELSY)
   Get the current printer's print resolution, note: X and Y directions may be different, unit: dots/inch
(3) Scale your output graphics according to the resolution and the print size you need

For example: the printer resolution is 600 dpi (X, Y directions are the same)
      Page 10*8 inch
For the program, the Canvas size of the printer page will be: 6000*4800

The specific calculation is not too complicated
Might as well try
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Post time: 2020-8-12 19:45:01
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What does the original poster do not understand?
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