ios - Coreplot: Setting length of global range not working -


to start with, have graph(coreplot linechart). have set x-range , y-range of defaultplotspace of graph. 

- (void) setupxrangeforplotspace:(cptxyplotspace *) plotspace {  int rangelength = [self xrangelength]; plotspace.xrange = [cptplotrange plotrangewithlocation:cptdecimalfromfloat(- 0.5f)    length:cptdecimalfromfloat(rangelength + 1.0)];  }  - (void) setupyrangeforplotspace:(cptxyplotspace *) plotspace {      float maxvalue = [self maximumyvalue];      // length = maxvalue + (10% of maxvalue);     plotspace.yrange = [cptplotrange plotrangewithlocation:cptdecimalfromfloat(0.0f)     length:cptdecimalfromfloat(maxvalue + (maxvalue/10.0))]; }

now task show portion (region) of graph along x-axis according user interaction. changing globalxrange of plotspace.

i took 2 textfields getting location , length. btnaction: method fired when button pressed.

- (void) btnaction:(id) sender {      float txt1fl = [txt1.text floatvalue];     float txt2fl = [txt2.text floatvalue];       nslog(@"txt1fl : %f, txt2fl : %f",txt1fl,txt2fl);      cptxyplotspace *plotspace = (cptxyplotspace *)graph.defaultplotspace;      [plotspace setglobalxrange:[cptplotrange plotrangewithlocation:cptdecimalfromfloat(txt1fl)  length:(cptdecimalfromfloat(txt2fl))]];     [plotspace setglobalyrange:plotspace.globalyrange];      nslog(@"graph global x:%f   length:%f",cptdecimalfloatvalue(plotspace.globalxrange.location),cptdecimalfloatvalue(plotspace.globalxrange.length));  }

when change location of range , leave length that, graph showing appropriate region. is, scrolling location mentioned number.

and when changing length of globalxrange higher lower value - example, changing length 5.0 3.0 - graph showing appropriate portion. is, showing smaller region in bigger picture.

but when change length of globalxrange lower higher - example, changing length 3.0 5.0 - range of graph not increasing.

after setting range checked using nslog if globalxrange's length has changed or not. surprisingly length has changed according nslog visually graph has not moved nor changed range.

i unable work out solution. please me this. in advance.

the globalxrange , globalyrange limit amount plot space can scroll , zoom using built-in user interaction features. use xrange , yrange control visible part of plots.


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