CLineChart

A class for plotting curves.

Description

The methods included in this class are designed for working with curves on the chart. It features the ability to fill the area limited by the plotted curve.

ccanvas_linechart

The code of the above figure is provided below.

Declaration

class CLineChart : public CChartCanvas

Title

#include <Canvas\Charts\LineChart.mqh>

Inheritance hierarchy

CCanvas

CChartCanvas

CLineChart

Class methods

Method	Action
Filled	Sets the flag for filling the area under the curve defined by the data series.
Create	Creates a graphical resource.
SeriesAdd	Adds a new data series.
SeriesInsert	Inserts data series to the chart.
SeriesUpdate	Updates data series on the chart.
SeriesDelete	Deletes data series from the chart.
ValueUpdate	Updates the specified value in the specified series.
DrawChart	Virtual method which draws a curve and all its elements.
DrawData	Virtual method which draws a curve for the specified series.
CalcArea	Calculates the area under the curve defined by the data series.

Methods inherited from class CChartCanvas

: ColorBackground, ColorBackground, ColorBorder, ColorBorder, ColorText, ColorText, ColorGrid, ColorGrid, MaxData, MaxData, MaxDescrLen, MaxDescrLen, AllowedShowFlags, ShowFlags, ShowFlags, IsShowLegend, IsShowScaleLeft, IsShowScaleRight, IsShowScaleTop, IsShowScaleBottom, IsShowGrid, IsShowDescriptors, IsShowPercent, ShowLegend, ShowScaleLeft, ShowScaleRight, ShowScaleTop, ShowScaleBottom, ShowGrid, ShowDescriptors, ShowValue, ShowPercent, LegendAlignment, Accumulative, VScaleMin, VScaleMin, VScaleMax, VScaleMax, NumGrid, NumGrid, VScaleParams, DataOffset, DataOffset, DataTotal, DescriptorUpdate, ColorUpdate

Example

//+------------------------------------------------------------------+
//|                                              LineChartSample.mq5 |
//|                   Copyright 2009-2017, MetaQuotes Software Corp. |
//|                                              http://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright   "2009-2017, MetaQuotes Software Corp."
#property link        "http://www.mql5.com"
#property description "Example of using line chart"
//---
#include <Canvas\Charts\LineChart.mqh>
//+------------------------------------------------------------------+
//| inputs                                                           |
//+------------------------------------------------------------------+
input bool Accumulative=false;
//+------------------------------------------------------------------+
//| Script program start function                                    |
//+------------------------------------------------------------------+
int OnStart(void)
  {
   int k=100;
   double arr[10];
//--- create chart
   CLineChart chart;
//--- create chart
   if(!chart.CreateBitmapLabel("SampleHistogrammChart",10,10,600,450))
     {
      Print("Error creating line chart: ",GetLastError());
      return(-1);
     }
   if(Accumulative)
     {
      chart.Accumulative();
      chart.VScaleParams(20*k*10,-10*k*10,20);
     }
   else
      chart.VScaleParams(20*k,-10*k,15);
   chart.ShowScaleTop(false);
   chart.ShowScaleRight(false);
   chart.ShowLegend();
   chart.Filled();
   for(int j=0;j<5;j++)
     {
      for(int i=0;i<10;i++)
        {
         k=-k;
         if(k>0)
            arr[i]=k*(i+10-j);
         else
            arr[i]=k*(i+10-j)/2;
        }
      chart.SeriesAdd(arr,"Item"+IntegerToString(j));
     }
//--- play with values
   while(!IsStopped())
     {
      int i=rand()%5;
      int j=rand()%10;
      k=rand()%3000-1000;
      chart.ValueUpdate(i,j,k);
      Sleep(200);
     }
//--- finish
   chart.Destroy();
   return(0);
  }

Last updated on 2026-07-24