Graph.cpp

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// Graph.cpp: implementation of the Graph class.
//

#include "Graph.h"

// Construction/Destruction

Graph::Graph(int width, int height, int bufferSize, int nSubGraphs, float min, float max):
   width(width), height(height), bufferSize(bufferSize), nSubGraphs(nSubGraphs),
   min(min), max(max){
   subGraphs=new GraphData*[nSubGraphs];
   for(int i=0;i<nSubGraphs;i++){
      subGraphs[i]=new GraphData(bufferSize);
   }

   bitmap.Create(width,height);
   dc.SelectObject(bitmap);
   dc.SetBackground(*wxWHITE_BRUSH);
}

Graph::~Graph(){
   for(int i=0;i<nSubGraphs;i++){
      delete subGraphs[i];
   }
   delete[] subGraphs;
}

void Graph::push(float value, int nSubGraph){
   subGraphs[nSubGraph]->push(value);
   if(value<min) min=value;
   if(value>max) max=value;
}

void Graph::drawBuffer(){
   dc.Clear();
   dc.SetBrush(*wxTRANSPARENT_BRUSH);
   dc.SetPen(*wxBLACK_PEN);
   dc.DrawRectangle(0,0, width, height);
   int effectiveWidth=width-1;
   int effectiveHeight=height-1;
   int dx=1;
   int dy=1;
   float zx=(float)effectiveWidth/bufferSize;
   float zy=(float)effectiveHeight/(max-min);

   GraphData* graphData;
   int i, g;
   int x, xOld, y, yOld;
   for(g=0;g<nSubGraphs;g++){
      graphData=subGraphs[g];
      if(g==0) dc.SetPen(*wxRED_PEN);
      else dc.SetPen(*wxGREEN_PEN);
      if(graphData->dataSize){
         xOld=dx;
         yOld=height-dy-zy*(graphData->getValue(0)-min);
         for(i=1;i<graphData->dataSize;i++){
            x=dx+i*zx;
            y=height-dy-zy*(graphData->getValue(i)-min);
            dc.DrawLine(xOld,yOld,x,y);
            xOld=x; 
            yOld=y;
         }
      }
   }
   wxString s;
   s.Printf("%g",max);
   dc.DrawText(s,dx,dy);
   s.Printf("%g",min);
   dc.DrawText(s,dx,height-dy-15);

}

void Graph::draw(wxDC* outdc, int x, int y){
   drawBuffer();
   outdc->Blit(x,y,width,height,&dc,0,0); 
}

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