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Normal Topic Unprecise ZoomFactor (Read 4170 times)
baron
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Unprecise ZoomFactor
Dec 2nd, 2007 at 2:09pm
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Due to the zoomfactor being a Long and not a Double, it is impossible to zoom the chart precisely. For example, to always make it fill 100% of the screen - sometimes you need a zoom factor of 8.5 but it gets rounded off to 8 and therefore it shows empty margins. I suppose this is the reason why ZoomToFit also leaves margins?
  
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Stoyo
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Re: Unprecise ZoomFactor
Reply #1 - Dec 3rd, 2007 at 8:31am
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Actually ZoomToFit leaves some empty margins intentionally. You can zoom more precisely using the following method:

float rx = (float)cntWidth / ctrlWidth;
float ry = (float)cntHeight / ctrlHeight;
float ratio = max(rx, ry);

put_ZoomFactor(SHORT(100 / ratio));
ScrollTo(cntX, cntY);

Here ctrlWidth/Height are the width and height of the FlowChartX window in pixels, and cntWidth/Height is the diagram content size in pixels, i.e. the rectangle that bounds all nodes and links.

Stoyan
  
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baron
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Re: Unprecise ZoomFactor
Reply #2 - Dec 3rd, 2007 at 11:34am
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That worked - thanks!

I suppose I should have mentioned though that I assumed this was a bug due to the Overview component. Is there an equivalent way to remove margins in the Overview? FitAll=true always adds margins and the algorithm I came up with didn't help.
  
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Stoyo
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Re: Unprecise ZoomFactor
Reply #3 - Dec 3rd, 2007 at 11:57am
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The Overview's FitAll mode fits the flowchart area as it has been set through SetDocSize, and there might be some margins between your outermost nodes and the document border. Call the FitDocToObjects method to see if more precise flowchart bounds will fix that.

Stoyan
  
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baron
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Re: Unprecise ZoomFactor
Reply #4 - Dec 3rd, 2007 at 1:13pm
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I played with the Doc Size and tried setting the Overview ScaleFactor manually using several methods but I couldn't get the precision I need. Maybe I'm doing something wrong.

Keep in mind that my Overview window is very small (100 pixels) so, for example, when I need a scale factor of 8.5, this gets rounded to 8 and margins get added.
  
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Stoyo
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Re: Unprecise ZoomFactor
Reply #5 - Dec 3rd, 2007 at 2:04pm
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Ok then, it is a rounding error if the overview is so small. Perhaps it will help if the overview size is proportional to the flowchart document size.

Stoyan
  
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