打印图像的实际尺寸 [英] Printing real dimensions of an image

问题描述

你好，我想打印一个图片，我生成的我使用以下代码

Hi mates i want to print a picture i generated i use the following code

  Printer.BeginDoc;
  Printer.Canvas.Draw(0,0,img1.Picture.Bitmap);
  Printer.EndDoc;

它的作品，但它打印的图像非常小如何打印图像的实际大小它出现在屏幕上？

It works but the image it prints is very small how can i print the actual size of the image as it appears on the screen ?

非常感谢。

推荐答案

您可以致电 Canvas.StretchDraw（） 。但是，为了取得成果而不能令人印象深刻。尝试以这种方式缩放光栅图像将导致非常多的结果。矢量图像是您需要的，以便能够扩展到打印机分辨率。

You can call Canvas.StretchDraw() instead. However, be prepared for the results to be less than impressive. Trying to scale a raster image in this way will lead to very blocky results. Vector images are what you need in order to be able to scale to printer resolutions.

var
  Scale: Integer;
...
Scale := Min(
  Printer.PageWidth div Bitmap.Width,
  Printer.PageHeight div Bitmap.Height
);
Printer.Canvas.StretchDraw(
  Rect(0, 0, Bitmap.Width*Scale, Bitmap.Height*Scale), 
  Bitmap
);

我在此处选择的缩放比例将保留纵横比，并在打印时使图像尽可能大。

The scaling I chose here will preserve the aspect ratio and make the image as large as possible when printed.

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