objective c - CorePlot LineGraph - hover/ click on graph to see values - macOS -


i using coreplot plot simple line graph in macos app. 

cptxygraph *newgraph = [[cptxygraph alloc] initwithframe:cgrectzero];  cpttheme *theme      = [cpttheme themenamed:kcptdarkgradienttheme]; [newgraph applytheme:theme]; self.graph = newgraph; self.hostview.hostedgraph = newgraph;  newgraph.plotareaframe.paddingtop   = 10.0; newgraph.plotareaframe.paddingbottom   = 30.0; newgraph.plotareaframe.paddingleft   = 40.0; newgraph.plotareaframe.paddingright  = 10.0;  cptxyplotspace *plotspace = (cptxyplotspace *)newgraph.defaultplotspace;     plotspace.xrange = [cptplotrange plotrangewithlocation:@(1.0) length:[nsnumber numberwithunsignedinteger:[dataarray count]-1]];     plotspace.yrange = [cptplotrange plotrangewithlocation:@0.0 length:@102.0];     plotspace.allowsuserinteraction = yes;  cptxyaxisset *axisset = (cptxyaxisset *)newgraph.axisset;     cptxyaxis *x          = axisset.xaxis;     //x.majorintervallength   = @1;     x.majorintervallength   = [nsnumber numberwithint:numberofintervalsx];     x.orthogonalposition    = @(0);     x.minorticksperinterval = 0;     x.labeloffset  = 0;      cptxyaxis *y = axisset.yaxis;     y.majorintervallength   = @5;     y.minorticksperinterval = 0;     y.orthogonalposition    = @(1.0);     y.labeloffset  = 0.0;  cptscatterplot *datasourcelineplot = [[cptscatterplot alloc] init];     cptmutablelinestyle *linestyle = [datasourcelineplot.datalinestyle mutablecopy];     linestyle.linewidth              = 2.;     linestyle.linecolor              = [cptcolor greencolor];     datasourcelineplot.datalinestyle = linestyle;       datasourcelineplot.datasource = self;     [newgraph addplot:datasourcelineplot];

i expecting hover/ click see values default behavior looks not. have tried searching forums no luck. assuming straight forward. not sure if missing something.

as far know, you're impression correct, there no built in data value overlay. however, can make yourself. coreplot has function indexofvisiblepointclosesttoplotareapoint: should give references needed add label w/ point value chart.

  • (nsuinteger) indexofvisiblepointclosesttoplotareapoint:

returns index of closest point, or nsnotfound if there no visible point.

then can subclass graph hostingview, implement mouse movement event capture mouse coordinates, , there whatever logic want chose how display points.

i wouldn't it's particularly easy implement, @ least straight foward. hope helps!

references:

http://core-plot.github.io/macos/interface_c_p_t_scatter_plot.html#a57eacc8261a4d4a1399f1196be786cff https://stackoverflow.com/a/21819342/357288


Comments

Post a Comment

Popular posts from this blog

angular - Ionic slides - dynamically add slides before and after -

hi i'm using ngfor create set of 3 slides while starting in middle i'm guaranteed able slide left or right on start. when slide right can simple listen reachedend , push slide array i'm looping. but have problem adding slide beginning. if same above , use e.g. array.unshift() or spread add item beginning, view think it's on position 0 , snaps view new slide. the code below work animates slide change index 1. slide = [0,1,2] //example loop slidechanged(event) { if(this.slides.isbeginning()){ this.slide = [this.slide[0]-1, ...this.slide]; this.slides.update(); this.slides.slideto(1) } } <ion-slides [initialslide]="1" (ionslidedidchange)="slidechanged($event)"> <ion-slide *ngfor="let item of slide"> <h1>slide {{item}}</h1> </ion-slide> </ion-slides> any appreciated! you can using ionslidenextend , ionslideprevend events slides . please
Read more

minify - Minimizing css files -

i want know how css files can minimized. currently, using external sites css minifier compress css files. however, after removing whitespaces, comments, etc, file sizes reduced 10-15%. how frameworks bootstrap manage make minimized versions kilobytes. as example, css is: body { background-color: #ff0; } the reduction goes 28 bytes 22 bytes other css files have lot more characters still smaller this. actually minifying code means it's remove thing code white space characters new line characters comments block delimiters it reduces amount of code has transferred on web , speed site load fastly.but unreadable format.
Read more

Add a dynamic header in angular 2 http provider -

i have http interceptor built via tutorial https://scotch.io/@kashyapmukkamala/using-http-interceptor-with-angular2 the problem need have dynamic header changes automatically once changes 'mode' in app. service able tell interceptor change header, or have interceptor pull header (which string)from service each request. able throwing away patch method, call http.patch('new header string') set header string. call in service controls 'mode' setting. wondering if there way interceptor pull recent value service each request or if can add method http provider via interceptor? i've tried call service in interceptor each request returns undefined. because creating new instance of service or copying value before service fired , loaded/changed data. i don't want pass header string every http provider call because defeats purpose of having interceptor, id able set once changes or have provider fetch service before makes request. tl;dr : need add autom
Read more