414 lines
13 KiB
MQL5
414 lines
13 KiB
MQL5
//+------------------------------------------------------------------+
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//| PieChart.mqh |
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//| Copyright 2000-2025, MetaQuotes Ltd. |
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//| https://www.mql5.com |
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//+------------------------------------------------------------------+
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#include "ChartCanvas.mqh"
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//+------------------------------------------------------------------+
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//| Class CPieChart |
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//| Usage: generates pie chart |
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//+------------------------------------------------------------------+
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class CPieChart : public CChartCanvas
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{
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private:
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//--- data
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CArrayDouble *m_values;
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//--- for draw
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int m_x0;
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int m_y0;
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int m_r;
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public:
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CPieChart(void);
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~CPieChart(void);
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//--- create
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virtual bool Create(const string name,const int width,const int height,ENUM_COLOR_FORMAT clrfmt=COLOR_FORMAT_XRGB_NOALPHA);
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//--- data
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bool SeriesSet(const double &value[],const string &text[],const uint &clr[]);
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bool ValueAdd(const double value,const string descr="",const uint clr=0);
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bool ValueInsert(const uint pos,const double value,const string descr="",const uint clr=0);
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bool ValueUpdate(const uint pos,const double value,const string descr=NULL,const uint clr=0);
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bool ValueDelete(const uint pos);
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protected:
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virtual void DrawChart(void);
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void DrawPie(double fi3,double fi4,int idx,CPoint &p[],const uint clr);
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string LabelMake(const string text,const double value,const bool to_left);
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};
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//+------------------------------------------------------------------+
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//| Constructor |
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//+------------------------------------------------------------------+
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CPieChart::CPieChart(void)
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{
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uint flags=FLAG_SHOW_LEGEND|FLAG_SHOW_DESCRIPTORS|FLAG_SHOW_VALUE|FLAG_SHOW_PERCENT;
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AllowedShowFlags(flags);
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ShowFlags(flags);
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}
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//+------------------------------------------------------------------+
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//| Destructor |
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//+------------------------------------------------------------------+
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CPieChart::~CPieChart(void)
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{
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}
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//+------------------------------------------------------------------+
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//| Create dynamic resource |
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//+------------------------------------------------------------------+
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bool CPieChart::Create(const string name,const int width,const int height,ENUM_COLOR_FORMAT clrfmt)
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{
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//--- create object to store data
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if((m_values=new CArrayDouble)==NULL)
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return(false);
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//--- pass responsibility for its destruction to the parent class
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m_data=m_values;
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//--- call method of parent class
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if(!CChartCanvas::Create(name,width,height,clrfmt))
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return(false);
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//--- succeed
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return(true);
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}
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//+------------------------------------------------------------------+
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//| Sets displayed parameters |
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//+------------------------------------------------------------------+
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bool CPieChart::SeriesSet(const double &value[],const string &text[],const uint &clr[])
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{
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//--- !!! user is responsible for correct filling of arrays !!!
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//--- check
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if(m_values==NULL)
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return(false);
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//--- set
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if(!m_values.AssignArray(value))
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return(false);
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if(!m_descriptors.AssignArray(text))
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return(false);
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if(!m_colors.AssignArray(clr))
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return(false);
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m_data_total=m_values.Total();
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//--- redraw
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Redraw();
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//--- succeed
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return(true);
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}
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//+------------------------------------------------------------------+
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//| Adds displayed parameter (to the end) |
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//+------------------------------------------------------------------+
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bool CPieChart::ValueAdd(const double value,const string descr,const uint clr)
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{
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//--- check
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if((value<=0))
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return(false);
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//--- add
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if(!m_values.Add(value))
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return(false);
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if(!m_descriptors.Add(descr))
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return(false);
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if(!m_colors.Add((clr==0) ? GetDefaultColor(m_data_total) : clr))
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return(false);
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m_data_total++;
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//--- redraw
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Redraw();
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//--- succeed
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return(true);
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}
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//+------------------------------------------------------------------+
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//| Inserts displayed parameter (to specified position) |
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//+------------------------------------------------------------------+
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bool CPieChart::ValueInsert(const uint pos,const double value,const string descr,const uint clr)
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{
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//--- check
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if((value<=0))
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return(false);
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//--- insert
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if(!m_values.Insert(value,pos))
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return(false);
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if(!m_descriptors.Insert(descr,pos))
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return(false);
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if(!m_colors.Insert((clr==0) ? GetDefaultColor(m_data_total) : clr,pos))
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return(false);
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m_data_total++;
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//--- redraw
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Redraw();
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//--- succeed
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return(true);
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}
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//+------------------------------------------------------------------+
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//| Updates displayed parameter (in specified position) |
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//+------------------------------------------------------------------+
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bool CPieChart::ValueUpdate(const uint pos,const double value,const string descr,const uint clr)
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{
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//--- check
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if((value<=0))
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return(false);
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//--- update
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if(!m_values.Update(pos,value))
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return(false);
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if(descr!=NULL && !m_descriptors.Update(pos,descr))
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return(false);
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if(clr!=0 && !m_colors.Update(pos,clr))
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return(false);
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//--- redraw
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Redraw();
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//--- succeed
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return(true);
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}
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//+------------------------------------------------------------------+
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//| Deletes displayed parameter (from specified position) |
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//+------------------------------------------------------------------+
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bool CPieChart::ValueDelete(const uint pos)
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{
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//--- delete
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if(!m_values.Delete(pos))
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return(false);
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m_data_total--;
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if(!m_descriptors.Delete(pos))
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return(false);
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if(!m_colors.Delete(pos))
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return(false);
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//--- redraw
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Redraw();
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//--- succeed
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return(true);
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}
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//+------------------------------------------------------------------+
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//| Draws |
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//+------------------------------------------------------------------+
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void CPieChart::DrawChart(void)
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{
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//--- check
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if(m_data_total==0)
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return;
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//--- variables
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string text="";
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double angle=M_PI*(m_data_offset%360)/180;
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int width,height;
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int dw=0;
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int dh=0;
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int index;
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CPoint p0[];
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CPoint p1[];
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//--- calculate geometry
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width =(m_data_area.Width()<<3)/10;
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height=(m_data_area.Height()<<3)/10;
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if(IS_SHOW_LEGEND || !IS_SHOW_DESCRIPTORS)
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{
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if(IS_SHOW_VALUE)
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dw=(int)m_max_value_width;
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else
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{
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if(IS_SHOW_PERCENT)
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dw=TextWidth("100.00%");
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}
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}
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else
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{
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if(IS_SHOW_DESCRIPTORS)
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{
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if(IS_SHOW_VALUE)
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dw=(int)m_max_value_width+TextWidth(" ()");
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else
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{
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if(IS_SHOW_PERCENT)
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dw=TextWidth(" (100.00%)");
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}
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dw+=(int)m_max_descr_width;
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}
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}
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//--- pie chart will always be round
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width -=2*dw+10;
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height-=20;
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m_x0=m_data_area.left+(m_data_area.Width()>>1);
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m_y0=m_data_area.top+(m_data_area.Height()>>1);
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m_r =(((width>height) ? height : width)>>1);
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//--- draw pie chart
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if(ArrayResize(p0,m_data_total+1)==-1)
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return;
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if(m_data_total==1)
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{
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FillCircle(m_x0,m_y0,m_r,m_colors[0]);
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Circle(m_x0,m_y0,m_r,m_color_border);
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}
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else
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{
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Circle(m_x0,m_y0,m_r,m_color_border);
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for(uint i=0;i<m_index_size;i++)
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{
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index=m_index[i];
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double val=m_values[index];
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double d_a=2*M_PI*val/m_sum;
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DrawPie(angle,angle+d_a,i,p0,m_colors[index]);
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angle+=d_a;
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angle=MathMod(angle,2*M_PI);
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}
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if(m_data_total!=m_index_size)
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DrawPie(angle,angle+2*M_PI*m_others/m_sum,m_index_size,p0,COLOR2RGB(clrBlack));
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for(uint i=0;i<=m_index_size;i++)
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Line(m_x0,m_y0,p0[i].x,p0[i].y,m_color_border);
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Circle(m_x0,m_y0,m_r,m_color_border);
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}
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//--- draw descriptors
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angle=M_PI*(m_data_offset%360)/180;
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int r1=(int)round(1.1*m_r);
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if(ArrayResize(p1,m_data_total)==-1)
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return;
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//--- calculations
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for(uint i=0;i<m_index_size;i++)
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{
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index=m_index[i];
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angle+=M_PI*m_values[index]/m_sum;
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//--- lines
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p0[i].x=m_x0+(int)round(m_r*cos(angle));
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p0[i].y=m_y0-(int)round(m_r*sin(angle));
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p1[i].x=m_x0+(int)round(r1*cos(angle));
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p1[i].y=m_y0-(int)round(r1*sin(angle));
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angle+=M_PI*m_values[index]/m_sum;
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}
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if(m_data_total!=m_index_size)
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{
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index=(int)m_data_total-1;
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angle+=M_PI*m_others/m_sum;
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p0[index].x=m_x0+(int)round(m_r*cos(angle));
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p0[index].y=m_y0-(int)round(m_r*sin(angle));
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p1[index].x=m_x0+(int)round(r1*cos(angle));
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p1[index].y=m_y0-(int)round(r1*sin(angle));
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}
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int x,y;
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//--- draw descriptors to the left
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for(uint i=0;i<m_index_size;i++)
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if(p0[i].x<m_x0)
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{
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x=p1[i].x-10;
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y=p1[i].y;
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index=m_index[i];
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text=LabelMake(m_descriptors[index],m_values[index],true);
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if(text!="")
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{
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Line(p0[i].x,p0[i].y,p1[i].x,p1[i].y,m_color_border);
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Line(p1[i].x,p1[i].y,x,y,m_color_border);
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TextOut(x-5,y,text,m_color_text,TA_RIGHT|TA_VCENTER);
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}
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}
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//--- draw descriptors to the right
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for(uint i=0;i<m_index_size;i++)
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if(p0[i].x>=m_x0)
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{
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x=p1[i].x+10;
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y=p1[i].y;
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index=m_index[i];
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text=LabelMake(m_descriptors[index],m_values[index],false);
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if(text!="")
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{
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Line(p0[i].x,p0[i].y,p1[i].x,p1[i].y,m_color_border);
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Line(p1[i].x,p1[i].y,x,y,m_color_border);
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TextOut(x+5,y,text,m_color_text,TA_LEFT|TA_VCENTER);
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}
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}
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if(m_data_total!=m_index_size)
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{
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index=(int)m_data_total-1;
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if(p0[index].x>=m_x0)
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{
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x=p1[index].x+10;
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y=p1[index].y;
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text=LabelMake("Others",m_others,true);
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TextOut(x+5,y,text,m_color_text,TA_LEFT|TA_VCENTER);
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}
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else
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{
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x=p1[index].x-10;
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y=p1[index].y;
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text=LabelMake("Others",m_others,false);
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TextOut(x-5,y,text,m_color_text,TA_RIGHT|TA_VCENTER);
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}
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if(text!="")
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{
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Line(p0[index].x,p0[index].y,p1[index].x,p1[index].y,m_color_border);
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Line(p1[index].x,p1[index].y,x,y,m_color_border);
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}
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}
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ArrayFree(p1);
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ArrayFree(p0);
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}
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//+------------------------------------------------------------------+
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//| Draw pie |
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//+------------------------------------------------------------------+
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void CPieChart::DrawPie(double fi3,double fi4,int idx,CPoint &p[],const uint clr)
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{
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//--- draw arc
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Arc(m_x0,m_y0,m_r,m_r,fi3,fi4,p[idx].x,p[idx].y,p[idx+1].x,p[idx+1].y,clr);
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//--- variables
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int x3=p[idx].x;
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int y3=p[idx].y;
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int x4=p[idx+1].x;
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int y4=p[idx+1].y;
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//--- draw radii
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if(idx==0)
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Line(m_x0,m_y0,x3,y3,clr);
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if(idx!=m_data_total-1)
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Line(m_x0,m_y0,x4,y4,clr);
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//--- fill
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double fi=(fi3+fi4)/2;
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int xf=m_x0+(int)(0.99*m_r*cos(fi));
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int yf=m_y0-(int)(0.99*m_r*sin(fi));
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Fill(xf,yf,clr);
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//--- for small pie
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if(fi4-fi3<=M_PI_4)
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Line(m_x0,m_y0,xf,yf,clr);
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}
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//+------------------------------------------------------------------+
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//| Make label for pie |
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//+------------------------------------------------------------------+
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string CPieChart::LabelMake(const string text,const double value,const bool to_left)
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{
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string label="";
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//---
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if(to_left)
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{
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if(IS_SHOW_LEGEND || !IS_SHOW_DESCRIPTORS)
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{
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if(IS_SHOW_VALUE)
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label=DoubleToString(value,2);
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else
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{
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if(IS_SHOW_PERCENT)
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label=DoubleToString(100*value/m_sum,2)+"%";
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}
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}
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else
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{
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label=text;
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if(IS_SHOW_VALUE)
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label+=" ("+DoubleToString(value,2)+")";
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else
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{
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if(IS_SHOW_PERCENT)
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label+=" ("+DoubleToString(100*value/m_sum,2)+"%)";
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}
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}
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}
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else
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{
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if(IS_SHOW_LEGEND || !IS_SHOW_DESCRIPTORS)
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{
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if(IS_SHOW_VALUE)
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label=DoubleToString(value,2);
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else
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{
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if(IS_SHOW_PERCENT)
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label=DoubleToString(100*value/m_sum,2)+"%";
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}
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}
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else
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{
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if(IS_SHOW_VALUE)
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label="("+DoubleToString(value,2)+") ";
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else
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{
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if(IS_SHOW_PERCENT)
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label="("+DoubleToString(100*value/m_sum,2)+"%) ";
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}
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label+=text;
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}
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}
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//---
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return(label);
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}
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//+------------------------------------------------------------------+
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