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Printing: Change fit-to-printable-are to scale 1:1
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lorenz.stechauner
2026-08-11 17:25:49 +02:00
parent 20b19775b1
commit 470c6e09e5
2 changed files with 14 additions and 17 deletions
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Elwig/Helpers/Printing/PdfPrinter.cs
+4 -15
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@@ -52,21 +52,10 @@ namespace Elwig.Helpers.Printing {
throw new InvalidOperationException($"Unable to load PDF page {pageIndex}."); throw new InvalidOperationException($"Unable to load PDF page {pageIndex}.");
try { try {
// PDF coordinates are points (1/72 inch). int renderWidth = (int)Math.Round(pageWidthPt / 72.0 * printer.DpiX);
// int renderHeight = (int)Math.Round(pageHeightPt / 72.0 * printer.DpiY);
// HORZRES/VERTRES are the printable area in int offsetX = (printer.PrintableWidth - renderWidth) / 2;
// device pixels for the current printer DC. int offsetY = (printer.PrintableHeight - renderHeight) / 2;
int widthPx = printer.PixelWidth;
int heightPx = printer.PixelHeight;
// Preserve aspect ratio.
double scaleX = widthPx / pageWidthPt;
double scaleY = heightPx / pageHeightPt;
double scale = Math.Min(scaleX, scaleY);
int renderWidth = Math.Max(1, (int)Math.Round(pageWidthPt * scale));
int renderHeight = Math.Max(1, (int)Math.Round(pageHeightPt * scale));
int offsetX = (widthPx - renderWidth) / 2;
int offsetY = (heightPx - renderHeight) / 2;
printer.StartPage(); printer.StartPage();
try { try {
Elwig/Helpers/Printing/Win32Printer.cs
+10 -2
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@@ -12,6 +12,10 @@ namespace Elwig.Helpers.Printing {
private const int VERTRES = 10; private const int VERTRES = 10;
private const int LOGPIXELSX = 88; private const int LOGPIXELSX = 88;
private const int LOGPIXELSY = 90; private const int LOGPIXELSY = 90;
private const int PHYSICALWIDTH = 110;
private const int PHYSICALHEIGHT = 111;
private const int PHYSICALOFFSETX = 112;
private const int PHYSICALOFFSETY = 113;
private const int DM_DUPLEX = 0x1000; private const int DM_DUPLEX = 0x1000;
private const short DMDUP_SIMPLEX = 1; private const short DMDUP_SIMPLEX = 1;
@@ -129,10 +133,14 @@ namespace Elwig.Helpers.Printing {
public IntPtr Hdc => _hdc; public IntPtr Hdc => _hdc;
public int PixelWidth => GetDeviceCaps(_hdc, HORZRES); public int PrintableWidth => GetDeviceCaps(_hdc, HORZRES);
public int PixelHeight => GetDeviceCaps(_hdc, VERTRES); public int PrintableHeight => GetDeviceCaps(_hdc, VERTRES);
public int DpiX => GetDeviceCaps(_hdc, LOGPIXELSX); public int DpiX => GetDeviceCaps(_hdc, LOGPIXELSX);
public int DpiY => GetDeviceCaps(_hdc, LOGPIXELSY); public int DpiY => GetDeviceCaps(_hdc, LOGPIXELSY);
public int PhysicalWidth => GetDeviceCaps(_hdc, PHYSICALWIDTH);
public int PhysicalHeight => GetDeviceCaps(_hdc, PHYSICALHEIGHT);
public int PhysicalOffsetX => GetDeviceCaps(_hdc, PHYSICALOFFSETX);
public int PhysicalOffsetY => GetDeviceCaps(_hdc, PHYSICALOFFSETY);
public Printer(string printerName) { public Printer(string printerName) {
_printerName = printerName; _printerName = printerName;