Chart printing questions

[bairog]

Hello.
I'm using TeeChart Pro 4.2018.12.17 and I have a form with chart that looks somewhat like the following:

Chart title (it will be visible only at print preview) has exact the same font as labels and textboxes on the top (Calibri, 12pt).
Axes lines have width = 2 while ticks, dashed grid lines and wall lines (top and right) have width = 1.
And I have some questions regarding printing:

1. Initial zoom for print preview is too small - it looks somewhat like:
   
   Is there a way to change that value?
2. If we zoom in - we can see that ticks and walls are ok, but dashed grid lines are too thick (they have the same width like axes lines) - you can open the following image in another tab to zoom in and see what exactly I'm talking about:
   
   Checking "Quality" checkbox changes nothing
3. As you can see while printing I'm adding labels and textboxes on the top:

   Code: Select all

   private void tChart1_ChartPrint(object sender, System.Drawing.Printing.PrintPageEventArgs e)
   {
   var temp = new Bitmap(panel1.Width, panel1.Height);
   panel1.DrawToBitmap(temp, new Rectangle(0, 0, panel1.Width, panel1.Height));
   var chartRect = (sender as Steema.TeeChart.ChartPrintJob).ChartRect;
   e.Graphics.DrawImage(temp, chartRect.Left + (chartRect.Width - temp.Width) / 2, chartRect.Top - temp.Height);
   }

   Chart title font is looking bigger than font for labels and textboxes (despite of being the same - Calibri, 12pt).
   Looks like that is because chart scales to fit the page (and so the chart title font does).
   So how can I get scaling coefficient (or coefficients for X/Y if they are not he same) by which I will need to multiply the font size for labels and textboxes?

[Christopher]

Hello,

in order to facilitate the resolution of defects which occur in more complex situations, such as your issue with printing, we ask our clients to produce a Minimal, Complete, and Verifiable example ('mcve') with which we can reproduce the issue here (an mcve is defined on this page) - would you please be so kind as to produce an mcve for us in this case?

[bairog]

Hello,

in order to facilitate the resolution of defects which occur in more complex situations, such as your issue with printing, we ask our clients to produce a Minimal, Complete, and Verifiable example ('mcve') with which we can reproduce the issue here (an mcve is defined on this page) - would you please be so kind as to produce an mcve for us in this case?

I've uploaded sample application here

[Marc]

Hello,

Thanks for uploading the demo project.

Re. 1. Zoom.
The property forms part of the preview and is private. We can look to opening up the Previewer to code, so that some defaults can be set before opening it.

Re 2. Grid Pen
With respect to Axis Grid. It seems that 'special' line pens, dash, dot etc, scale differently to solid lines. A solid line appears to keep its dimension rather better, we'll look into options.

Re. 3. Title/Label fonts.
With respect to Title and Axis Label fonts: Not sure about that; they are different when opened in the demo here (header Calibri, axis labels, Verdana). You can guarantee that they'll come out the same when opening the Preview if you make one a copy of the other.
eg.

Code: Select all

tChart1.Header.Font = tChart1.Axes.Left.Labels.Font;
tChart1.Printer.Landscape = true;
tChart1.Printer.Preview();

We'll check through the pending points; if it looks possible to enable the preview functionality we'll do so for an upcoming release.

Regards,
Marc Meumann

[bairog]

Re 2. Grid Pen
With respect to Axis Grid. It seems that 'special' line pens, dash, dot etc, scale differently to solid lines. A solid line appears to keep its dimension rather better, we'll look into options.

Regarding dash line: if you copy-paste print-previewed chart to any image editor and zoom it in - you can see that:

1. Dashes is printed two times thicker than should be (it is like left axis line, but should be like top and right wall line)
2. Space between dashes is printed with thin line (like top and right wall line)- it should be empty

Re. 3. Title/Label fonts.
With respect to Title and Axis Label fonts: Not sure about that; they are different when opened in the demo here (header Calibri, axis labels, Verdana).

I mean chart title font ("TeeChart title") and font for label above chart("Some text"). They are both Calibri, 12pt. But while print preview they look different (chart title font is bigger). I supposed that it is because of chart scaling (chart is enlarging to fit a sheet of paper) - and I asked how can I calculate chart scale coefficient (X and Y).

[Marc]

Hello,

Re.

I mean chart title font ("TeeChart title") and font for label above chart("Some text"). They are both Calibri, 12pt. But while print preview they look different (chart title font is bigger). I supposed that it is because of chart scaling (chart is enlarging to fit a sheet of paper) - and I asked how can I calculate chart scale coefficient (X and Y).

Ok, I'd misunderstood. Yes, very difficult to match up the outcome of the font size if you're working with a bitmap that will be stretched/resized according to where it's output.

There are alternative techniques though if you wish to output shapes and text to the Chart, You could use the OnAfterDraw method. This limits the area to plot to that which is sizewise available before printing but in this example an adjustment is made to the top margin on the chart before printing.

eg.
call with

Code: Select all

void myPrintMethod()
//....
double oldTopMargin = tChart1.Panel.MarginTop;
tChart1.Panel.MarginTop = 10; //make space for new content
tChart1.Printer.Preview();
tChart1.Panel.MarginTop = oldTopMargin; //reset Margin
//....
}

private void tChart1_AfterDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g)
{
	if (tChart1.Printing)
	{
		string myText = label1.Text;

		Rectangle myRect = new Rectangle(0, 0, panel3.Width, panel3.Height);

		g.Brush.Color = panel3.BackColor;
		g.Rectangle(new Rectangle(g.ChartXCenter-(myRect.Width/2), 0,myRect.Width,myRect.Height));
		g.Font = tChart1.Header.Font;
		g.TextOut((int)(g.ChartXCenter - (g.TextWidth(myText) / 2)), (int)((myRect.Height/2) - (g.TextHeight("T")/2)), myText);
	}
}

Regards,
Marc

[bairog]

Yes, very difficult to match up the outcome of the font size if you're working with a bitmap that will be stretched/resized according to where it's output.

There are alternative techniques though if you wish to output shapes and text to the Chart, You could use the OnAfterDraw method. This limits the area to plot to that which is sizewise available before printing but in this example an adjustment is made to the top margin on the chart before printing.

Thx, that code works like a charm (both for Album and Landscape orientations).

[bairog]

Re. 1. Zoom.
The property forms part of the preview and is private. We can look to opening up the Previewer to code, so that some defaults can be set before opening it.

Re 2. Grid Pen
With respect to Axis Grid. It seems that 'special' line pens, dash, dot etc, scale differently to solid lines. A solid line appears to keep its dimension rather better, we'll look into options.

Hello again.
Any progress on this two moments for today?
Thank you.