Determining the DPI of the Canvas?

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stevemaughan Members Profile Find Members Posts Beginner Joined: 08 Oct 14 Location: United States Status: Offline Points: 7	Post Options Post Reply Quote stevemaughan Report Post Thanks(0) Quote Reply Topic: Determining the DPI of the Canvas? Posted: 08 Oct 14 at 1:11PM
	Hi - I'd like to draw a map as a PDF file. This will require a lot of vector graphics. To do this I need to know the resolution of the canvas (e.g. pixels per inch). Or I need to set the resolution of the canvas. Is this possible? If so, how can I do it? Thanks, Steve

erico Members Profile Find Members Posts Senior Member Joined: 24 Sep 14 Location: Minnesota USA Status: Offline Points: 51	Post Options Post Reply Quote erico Report Post Thanks(0) Quote Reply Posted: 08 Oct 14 at 3:06PM
	You pick the dpi yourself when you RenderPageToDC (or DARenderPageToDC). It is one of the parameters: int DPLDARenderPageToDC(int InstanceID, int FileHandle, int PageRef, double DPI, HDC DC); Maybe I misunderstood. You want to know what value to supply. Look at the response to Previewing a PDF before Saving? This shows the appropriate calculations to create a device context with the correct dpi Edited by erico - 08 Oct 14 at 3:15PM

stevemaughan Members Profile Find Members Posts Beginner Joined: 08 Oct 14 Location: United States Status: Offline Points: 7	Post Options Post Reply Quote stevemaughan Report Post Thanks(0) Quote Reply Posted: 08 Oct 14 at 3:20PM
	Wonderful! Many thanks, Steve

mLipok Members Profile Find Members Posts Senior Member Joined: 23 Apr 14 Location: Poland, Zabrze Status: Offline Points: 449	Post Options Post Reply Quote mLipok Report Post Thanks(0) Quote Reply Posted: 09 Oct 14 at 2:43PM
	btw. this is described here: http://www.debenu.com/kb/map-pdf-coordinates-delphi-graphics-canvas-coordinates/ Edited by mLipok - 09 Oct 14 at 2:46PM
	Here you can find description how to test my examples: http://www.quickpdf.org/forum/forum_posts.asp?TID=2932&PID=12600&title=drawcapturedpagematrix-matrix-howto#12600

stevemaughan Members Profile Find Members Posts Beginner Joined: 08 Oct 14 Location: United States Status: Offline Points: 7	Post Options Post Reply Quote stevemaughan Report Post Thanks(0) Quote Reply Posted: 09 Oct 14 at 2:47PM
	Thanks - looks like a great article!

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