How do I change the legend range/level for TColorGridSeries

Fang · Post by **Fang** » Sat Apr 01, 2006 6:46 pm

For TColorGridSeries, how do I set the range of legend (Y value) manually, ex from 0 to 1 and show 5 levels in between, like the contour plot levels.

thanks.

Narcís · Post by **Narcís** » Mon Apr 03, 2006 8:50 am

Hi Fang,

You should create your own palette levels as told here.

Fang · Post by **Fang** » Mon Apr 03, 2006 1:15 pm

Code: Select all

 
	Series1->FillSampleValues(32);
	Series1->UsePalette =true;
	Series1->UseColorRange = false;
	Series1->ClearPalette();
	Series1->AddPalette(0,clYellow);
	Series1->AddPalette(0.5,clGreen);
	Series1->AddPalette(1,clRed);

I tried the above code, but isn't quite what I want. I just don't want the lengend to show that many levels, but I do want the color to be smooth out in between.
But then I tried to set UseColorRange to true, it seems working but using colorrange color not the palette color. Am I doing right? Thanks.

Fang · Post by **Fang** » Mon Apr 03, 2006 1:31 pm

Basically I want a long legend bar (continous color, which can be set) with only a few number besides it, like this.

|| 1.0
||
||
||
|| 0.5
||
||
||
|| 0.0

Most of the color annotated graph has a legend like that instead of like
|| 1.1034
|| 0.9453
|| 0.8545
|| 0.7434
|| 0.6434
|| 0.5344
|| 0.4343
|| 0.3323
|| 0.2344

Badly needed. Thanks.

Narcís · Post by **Narcís** » Mon Apr 03, 2006 1:52 pm

Hi Fang,

To achieve that you can use OnGetLegendText and set to an empty string the values you don't want to be displayed and modify the ones you want.

Fang · Post by **Fang** » Mon Apr 03, 2006 2:10 pm

it'll be great if you guys add a feature like this.

'Cause esentially the legend for TColorGrid is another axis Y, I want to be able to adjust this axis as easy as other axises. Ex. set a range and steps

Thanks.

Narcís · Post by **Narcís** » Mon Apr 03, 2006 2:21 pm

Hi Fang,

You can also have that legend customly drawing on TeeChart's canvas.

Fang · Post by **Fang** » Mon Apr 03, 2006 2:39 pm

Code: Select all

	Series1->UseColorRange = true;
	Series1->ClearPalette();
	for (size_t i=0; i <= 40; i++)
		Series1->AddPalette(0.025*i,clTeeColor);


void __fastcall TForm1::Chart1GetLegendText(TCustomAxisPanel *Sender,
	  TLegendStyle LegendStyle, int Index, AnsiString &LegendText)
{
	int m=Index-(Index/4)*4;
	if (m!=0) LegendText="";
}

I used the above code and it almost worked except that the funny thing is that the lenght of this legend bar is dependent on the number of palettes.

beetle · Post by **beetle** » Mon Apr 03, 2006 3:27 pm

Hi Fang,

You can get a continuous legend doing one of these things:
- Setting chart->Legend->VertSpacing less than 0 (I have set -10)
- or setting chart->Legend->Symbol->Continuous = true; (Legend Symbols tab)

And for the legend texts, you should use a coefficient dependant on the
number of palleteSteps (series->PalleteSteps)

Beetle.

Fang · Post by **Fang** » Mon Apr 03, 2006 4:13 pm

thanks Beetle. I'm doing that