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UScientificGraph.cpp
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UScientificGraph.cpp
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//---------------------------------------------------------------------------
// TScientificGraph -- an object for scientific plots
// This version by Peter Miller 18/7/2019 as csv file grapher
//
// Loosely based on an original public domain version by Frank heinrich, mail@frank-heinrich.de
// Major tidy up 1/9/2019 to remove unused functionality
// 6/2/2021 for 2v0 major change to use float *x_vals,*y_vals rather than SDataPoints in a TLIST.
//
/*----------------------------------------------------------------------------
* Copyright (c) 2019,2022 Peter Miller
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHOR OR COPYRIGHT HOLDER BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*--------------------------------------------------------------------------*/
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
#include <vcl.h>
#include <math.h>
#include <stdio.h>
#include <values.h>
#include <time.h>
#pragma hdrstop
#include <exception>
#include "UScientificGraph.h"
#include "UScalesWindow.h"
#include "UDataPlotWindow.h"
#include "Unit1.h"
#include "About.h"
#define NoForm1 /* says Form1 is defined in another file */
#include "rprintf.h"
#include "expr-code.h"
#include <cmath>
#include "kiss_fftr.h" // for fft
#include "_kiss_fft_guts.h"
#include "yasort2.h" /* needs to be set so we sort float's ie include "#define elem_type_sort2 float" */
#include "yamedian.h" /* needs to be set to work on floats eg #define elem_type_median float */
#include "interpolate.h"
#include "smooth_diff.h"
#include "smoothing_spline.h"
// #define USE_double_to_str_exp /* define to use double_to_str_exp() for y axis with max 12 chars, if not defined use gcvt() */
#ifdef USE_double_to_str_exp
#include "float_to_str.h"
#endif
//---------------------------------------------------------------------------
#pragma package(smart_init)
//#define P_UNUSED(x) (void)x; /* a way to avoid warning unused parameter messages from the compiler */
#define DOUBLE float /* define as double to go back to original, but as points are stored as floats we can use floats in several places */
// I'm sorry for the next 2 lines, but otherwise I get a lot of warnings "zero as null pointer constant"
#undef NULL
#define NULL (nullptr)
#define STR_CONV_BUF_SIZE 2000 // the largest string you may have to convert. depends on your project
static wchar_t* __fastcall Utf8_to_w(const char* c) // convert utf encoded string to wide chars - new function
{
static wchar_t w[STR_CONV_BUF_SIZE];
memset(w,0,sizeof(w));
MultiByteToWideChar(CP_UTF8, 0, c, -1, w, STR_CONV_BUF_SIZE-1); // utf-8 (this is a windows function )
return(w);
}
// Below from https://stackoverflow.com/questions/1031645/how-to-detect-utf-8-in-plain-c
// modified Peter Miller 29-5-2024
// returns true when not a pure ascii string , but is a valid utf8 string
static bool is_utf8(const char * string);
static bool is_utf8(const char * string)
{bool not_ascii=false;
if(!string)
return 0;
const unsigned char * bytes = (const unsigned char *)string; // in case char is signed
while(*bytes)
{
if( (// ASCII - only allow values that may reasonably be in a utf8 string
bytes[0] == 0x09 ||
bytes[0] == 0x0A ||
bytes[0] == 0x0D ||
(0x20 <= bytes[0] && bytes[0] <= 0x7E)
)
) {
bytes ++;
continue;
}
if( (// non-overlong 2-byte
(0xC2 <= bytes[0] && bytes[0] <= 0xDF) &&
(0x80 <= bytes[1] && bytes[1] <= 0xBF)
)
) { not_ascii=true;
bytes += 2;
continue;
}
if( (// excluding overlongs
bytes[0] == 0xE0 &&
(0xA0 <= bytes[1] && bytes[1] <= 0xBF) &&
(0x80 <= bytes[2] && bytes[2] <= 0xBF)
) ||
(// straight 3-byte
((0xE1 <= bytes[0] && bytes[0] <= 0xEC) ||
bytes[0] == 0xEE ||
bytes[0] == 0xEF) &&
(0x80 <= bytes[1] && bytes[1] <= 0xBF) &&
(0x80 <= bytes[2] && bytes[2] <= 0xBF)
) ||
(// excluding surrogates
bytes[0] == 0xED &&
(0x80 <= bytes[1] && bytes[1] <= 0x9F) &&
(0x80 <= bytes[2] && bytes[2] <= 0xBF)
)
) { not_ascii=true;
bytes += 3;
continue;
}
if( (// planes 1-3
bytes[0] == 0xF0 &&
(0x90 <= bytes[1] && bytes[1] <= 0xBF) &&
(0x80 <= bytes[2] && bytes[2] <= 0xBF) &&
(0x80 <= bytes[3] && bytes[3] <= 0xBF)
) ||
(// planes 4-15
(0xF1 <= bytes[0] && bytes[0] <= 0xF3) &&
(0x80 <= bytes[1] && bytes[1] <= 0xBF) &&
(0x80 <= bytes[2] && bytes[2] <= 0xBF) &&
(0x80 <= bytes[3] && bytes[3] <= 0xBF)
) ||
(// plane 16
bytes[0] == 0xF4 &&
(0x80 <= bytes[1] && bytes[1] <= 0x8F) &&
(0x80 <= bytes[2] && bytes[2] <= 0xBF) &&
(0x80 <= bytes[3] && bytes[3] <= 0xBF)
)
) { not_ascii=true;
bytes += 4;
continue;
}
return false; // not a valid utf-8 string
}
return not_ascii; // is valid utf8 string, but only return true if not ascii
}
extern TForm1 *Form1;
extern double actual_dXMin,actual_dXMax,actual_dYMin,actual_dYMax;
extern int zoom_fun_level;
double actual_dXMin=0,actual_dXMax=100,actual_dYMin=-1,actual_dYMax=1;// initialised to same values as below
int zoom_fun_level=0; // used to keep track of level of recursion in zoom function (allows partial display refresh for speed in multiple zooms)
TScientificGraph::TScientificGraph(int iBitmapWidthK, int iBitmapHeightK)
{
iBitmapWidth = iBitmapWidthK; //bitmap
iBitmapHeight = iBitmapHeightK;
iNumberOfGraphs = 0; //no graphs
pHistory = new TList(); //Graphs
pBitmap = new Graphics::TBitmap; //bitmap
pBitmap->Width = iBitmapWidth;
pBitmap->Height = iBitmapHeight;
ColBackGround = clBlack; //default settings
ColGrid = clOlive;
ColAxis = clRed;
ColText = clYellow;
iTextSize = 10; // size of most text
aTextSize = 12; // size of axis titles
PSAxis = psSolid;
PSGrid = psDot;
iTickLength=10;
iPenWidthAxis=1;
iPenWidthGrid=1;
iTextOffset=5;
sSizeX.dMin=0;
sSizeX.dMax=100;
sSizeY.dMin=-1;
sSizeY.dMax=1;
iGridsPerX=10;
iGridsPerY=10;
bGrids=true;
bZeroLine=true;
fLeftBorder = 0.13f;
fRightBorder = 0.025f;
fTopBorder = 0.04f;
fBottomBorder = 0.11f;
dInX=0.8;
dOutX=10.0/8.0;
dInY=0.8;
dOutY=10.0/8.0;
dShiftFactor=0.1;
XLabel="Horizontal axis title";
YLabel1="Vertical";
YLabel2="axis title";
/* note these defaults are changed in UDataPlotWindow.cpp */
dLegendStartX=0.5; // was 0.5
dLegendStartY=0.95; // was 0.95
dCaptionStartX=0.5; // was 0.5
dCaptionStartY=0.5; // was 0.5
iSkipLineLevel=2; // adjacent points
fnResize(); //put size to scales
};
//------------------------------------------------------------------------------
TScientificGraph::~TScientificGraph()
{ fnClearAll() ; // clear (delete) all lines + the data they hold
pHistory->Clear();
delete pHistory;
delete pBitmap;
pBitmap=NULL;
};
//-----------------------------------------------------------------------------
void TScientificGraph::resize_bitmap(int iBitmapWidthK, int iBitmapHeightK)
{ // resize bitmap
iBitmapWidth = iBitmapWidthK; //bitmap
iBitmapHeight = iBitmapHeightK;
if(pBitmap!=NULL)
{
pBitmap->Width = iBitmapWidth;
pBitmap->Height = iBitmapHeight;
}
}
//-----------------------------------------------------------------------------
bool TScientificGraph::fnKoord2Point(TPoint *pPoint, double dXValueF,
double dYValueF)
{
double dXKoord, dYKoord;
//calculate bitmap coordinates
dXKoord = (dXValueF-sScaleX.dMin)
/(sScaleX.dMax-sScaleX.dMin);
dXKoord *= iBitmapWidth*(1-fRightBorder-fLeftBorder);
dXKoord += iBitmapWidth*fLeftBorder;
dYKoord = (dYValueF-sScaleY.dMin)
/(sScaleY.dMax-sScaleY.dMin);
dYKoord *= iBitmapHeight*(1-fTopBorder-fBottomBorder);
dYKoord = iBitmapHeight-iBitmapHeight*fBottomBorder-dYKoord;
if(dXKoord>0) //round to integer
{dXKoord += 0.5;} else {dXKoord-=0.5;}
if(dYKoord>0)
{dYKoord += 0.5;} else {dYKoord-=0.5;}
#if 1
// pPoint values are ints (32 bits) max values are MaxInt 2147483647
if (dXKoord>MaxInt) {dXKoord=MaxInt;} //no integer overflow
if (dXKoord<-MaxInt) {dXKoord=-MaxInt;} // was -32768
if (dYKoord>MaxInt) {dYKoord=MaxInt;}
if (dYKoord<-MaxInt) {dYKoord=-MaxInt;} // was -32768
#else
if (dXKoord>32767) {dXKoord=32767;} //no integer overflow
if (dXKoord<-32767) {dXKoord=-32767;} // was -32768
if (dYKoord>32767) {dYKoord=32767;}
if (dYKoord<-32767) {dYKoord=-32767;} // was -32768
#endif
pPoint->x=(long)dXKoord; //to integer
pPoint->y=(long)dYKoord;
if ((dXKoord<iBitmapWidth*fLeftBorder) || //point in plot?
(dXKoord>iBitmapWidth*(1-fRightBorder)) ||
(dYKoord<iBitmapHeight*fTopBorder) ||
(dYKoord>iBitmapHeight*(1-fBottomBorder)))
{ return false;} //no.
return true; //yes.
};
//------------------------------------------------------------------------------
static double xs,ys; // start of next line (end of previous line)
/* Dan Cohen & Ivan Sunderland clipping algorithm - see Principles of interactive computer graphics 2nd Ed, pp 65-67 */
/* this version is functionally the same as the original with various bugs resolved and efficiency improvements */
#define LEFT 1 /* bits - must all be different powers of 2 */
#define RIGHT 2
#define BOTTOM 4
#define TOP 8
void TScientificGraph::graph_line(double xe,double ye,double xmin,double xmax,double ymin,double ymax)
{// draw line from xs,ys to xe,ye clipped by min/max . Afterwards set xs,ys to xe,ye.
int outcode1=0, outcode2=0;
int c=0;
bool line_visible; //decides if line is to be drawn
double x1=xs,y1=ys,x2=xe,y2=ye;
xs=xe; // save line end as start of next line , means we can just return if nothing to draw
ys=ye;
if(x1 < xmin) outcode1 =LEFT; // for 1st one we can just assign as we know previous value was 0
if(x2 < xmin) outcode2 =LEFT; // for 1st one we can just assign as we know previous value was 0
if(x1 > xmax) outcode1 |=RIGHT; // need to OR in the remainder of the values
if(x2 > xmax) outcode2 |=RIGHT;
if(outcode1&outcode2) return; // return if x values out of range , no need to check anything else
if(y1 > ymax) outcode1 |=TOP;
if(y1 < ymin) outcode1 |=BOTTOM;
if(y2 > ymax) outcode2 |=TOP;
if(y2 < ymin) outcode2 |=BOTTOM;
if(outcode1&outcode2) return; // return if y values out of range
//AND of both codes != 0 => Line is outside. Reject line
// if some of all line is visible find which bit
line_visible = true; // if we get here assume line will be visible
while(outcode1 | outcode2) // every iteration removes 1 bit from outcode1 or outcode2 as (outcode1 & outcode2)==0 at the start we can do at most 4 iterations of this loop
{
// line part in and part out
double m,x,y;
try
{
if(x1!=x2)
m=(y2-y1)/(x2-x1); // slope of line
else
{// vertical line (at x=x1) process as a special case here
if(y1>y2) {y=y1;y1=y2;y2=y;} // swap so y2>y1
if(y1>ymax || y2<ymin || x1<xmin || x1>xmax)
{// not visible
line_visible = false;
break;
}
if(y2>ymax) y2=ymax;
if(y1<ymin) y1=ymin;
break;
}
int temp;
//Decide if point1 is inside, if not, calculate intersection
if(outcode1==0)
{
temp = outcode2;
x=x2;
y=y2;
}
else
{
temp = outcode1;
x=x1;
y=y1;
}
if(temp & TOP) //Line clips top edge , need to check this is still true before we adjust x,y as previous adjustments may already have fixed this
{c= TOP;
if(y>ymax)
{
if(fabs(m)<1e-250)
{// y=mx+c if m=0 then y=c if y>ymax then cannot fix this so line is not visible
line_visible = false;
break;
}
else
x = x1+ (ymax-y1)/m;
y = ymax;
}
}
else if(temp & BOTTOM)
{ //Line clips bottom edge
c=BOTTOM;
if(y<ymin)
{
if(fabs(m)<1e-250)
{// y=mx+c if m=0 then y=c if y<ymin then cannot fix this so line is not visible
line_visible = false;
break;
}
else
x = x1+ (ymin-y1)/m;
y = ymin;
}
}
else if(temp & LEFT)
{ //Line clips left edge
c=LEFT;
if(x<xmin)
{
x = xmin;
y = y1+ m*(xmin-x1);
}
}
else if(temp & RIGHT)
{ //Line clips right edge
c=RIGHT;
if(x>xmax)
{
x = xmax;
y = y1+ m*(xmax-x1);
}
}
//Check which point we had selected earlier as temp, and replace its co-ordinates , and delete this limit from its list
if(outcode1 != 0)
{
x1 = x;
y1 = y;
outcode1 &= ~c;
}
else {
x2 = x;
y2 = y;
outcode2 &= ~c;
}
}
catch (...)
{// rprintf("CLIP:catch!\n");
line_visible = false;
break; // just in case there is a maths error not trapped in the code above as a special case (all should be trapped)
}
}// end while(...)
if(line_visible)
{// visible portion of line is from x1,y1 to x2,y2
TPoint Point1; // avoid dynamic memory allocation overhead if we used new and delete
TPoint *pPoint1=&Point1;
TPoint Point2;
TPoint *pPoint2=&Point2;
fnKoord2Point(pPoint1,x1,y1);
fnKoord2Point(pPoint2,x2,y2);
if((Point1.x!=Point2.x || Point1.y!=Point2.y))
{// if line start and end are different then draw line
pBitmap->Canvas->PenPos=Point1;
pBitmap->Canvas->LineTo(Point2.x,Point2.y);
}
}
return;
}
//------------------------------------------------------------------------------
void TScientificGraph::fnPaint()
{
double fMinGrid, fMaxGrid; // double to allow effectively unlimited zooming
size_t iCount;
int i,j;
double dADoub;
double dX, dY; // even in inner loops these need to be doubles [ due to my extra clipping code]
char szAString[31],lasttick[31];
AnsiString AAnsiString;
TRect LayoutRect;
TSize ASize;
SGraph *pAGraph;
TPoint Point; // avoid dynamic memory allocation overhead if we used new and delete
TPoint *pPoint=&Point;
TPoint Point2; // avoid dynamic memory allocation overhead if we used new and delete
TPoint *pPoint2=&Point2;
// rprintf("fnPaint()\n");
fnCheckScales(); //check scales
// double xd=sScaleX.dMax-sScaleX.dMin; // total span
//Background
LayoutRect.Left = 0;
LayoutRect.Top = 0;
LayoutRect.Right = pBitmap->Width;
LayoutRect.Bottom = pBitmap->Height;
pBitmap->Canvas->Brush->Color = ColBackGround;
pBitmap->Canvas->FillRect(LayoutRect);
pBitmap->Canvas->Font->Name="Arial";
//Gridlines, Ticks, Ticklabels
double gridsize=dGridSizeX; // inital grid size
//x-axis
fMinGrid = ceil(sScaleX.dMin/gridsize); //min grid
fMaxGrid = floor(sScaleX.dMax/gridsize); //max grid
const char *tickformat="%.8g"; // default tick format
lasttick[0]=0; // zero length string to start so 1st label always printed
iCount=0; // nos ticks values skipped
// rprintf("xaxis fMinGrid=%g fMaxGrid=%g iCount=%d\n",fMinGrid, fMaxGrid,iCount);
//paint grids,ticks
// check if all labels will be the same in .8g format
snprintf(lasttick,sizeof(lasttick),"%.8g",fMinGrid*gridsize);
snprintf(szAString,sizeof(szAString),"%.8g",fMaxGrid*gridsize);
if(strncmp(szAString,lasttick,sizeof(szAString))==0 || fMinGrid>=fMaxGrid )
{// same display fewer points to higher accuracy
gridsize=5.0;
fMinGrid = ceil(sScaleX.dMin/gridsize); //min grid
fMaxGrid = floor(sScaleX.dMax/gridsize); //max grid
tickformat="%.10g"; // high resolution tick format [was .14g but this is rather excessive when values are only floats ]
}
lasttick[0]=0; // zero length string to start so 1st label always printed
// rprintf("xaxis fMinGrid=%g fMaxGrid=%g (max-min=%g) gridsize=%g fmt=%s\n",fMinGrid, fMaxGrid,fMaxGrid-fMinGrid,gridsize,tickformat);
// see how many points will be skipped
i=0;
/* # pragma's below work for gcc and clang compilers , issue is that format argument to snprintf (tickformat) is a variable */
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wformat-nonliteral"
if(fMinGrid<fMaxGrid)
for (double fi = fMinGrid; fi<=fMaxGrid && i< 100; fi=fi+1.0,++i) // && i< 100 stops looping forever if we run out of resolution
{
dADoub = fi * gridsize; //x-value grid
snprintf(szAString,sizeof(szAString),tickformat,dADoub); //tick labels .8g is the largest that will fit with full grid
if(strncmp(szAString,lasttick,sizeof(szAString))!=0 || (fi+1.0>fMaxGrid && iCount<2))
{// new tick label different to previous one , or last one and only printed 1 previously
snprintf(lasttick,sizeof(szAString),"%s",szAString); // save this one as last printed , cannot use strncpy as that does not guarantee a null terminated string
}
else ++iCount; // point skipped
}
// now actually draw axes for real
lasttick[0]=0; // zero length string to start so 1st label always printed
if(fMinGrid<fMaxGrid && iCount<=1 && i<15) // if at most one point skipped and 14 plotted
{i=0;
iCount=0;
for (double fi = fMinGrid; fi<=fMaxGrid && i< 100 && iCount<15 ; fi=fi+1.0,++i) // && i< 100 stops looping forever if we run out of resolution
{
dADoub = fi * gridsize; //x-value grid
if (bGrids) fnPaintGridX(dADoub); //paint grids
fnPaintTickX(dADoub,1); //paint ticks
snprintf(szAString,sizeof(szAString),tickformat,dADoub); //tick labels .8g is the largest that will fit with full grid
if(strncmp(szAString,lasttick,sizeof(szAString))!=0 || (fi+1.0>fMaxGrid && iCount<2))
{// new tick label different to previous one , or last one and only printed 1 previously
++iCount;
AAnsiString=AnsiString(szAString);
fnKoord2Point(pPoint,dADoub,sScaleY.dMin);
ASize = pBitmap->Canvas->TextExtent(AAnsiString);
pBitmap->Canvas->Font->Color=ColText;
pBitmap->Canvas->Font->Size=iTextSize;
pBitmap->Canvas->TextOut(pPoint->x-ASize.cx/2,pPoint->y+iTextOffset,AAnsiString);
snprintf(lasttick,sizeof(szAString),"%s",szAString); // save this one as last printed , cannot use strncpy as that does not guarantee a null terminated string
}
}// end for
}
else
#if 1 /* double step so we can increase resolution of numbers */
{i=0;
iCount=0;
tickformat="%.10g";
for (double fi = fMinGrid; fi<=fMaxGrid && i< 100 && iCount<11 ; fi=fi+2.0,++i) // && i< 100 stops looping forever if we run out of resolution
{
dADoub = fi * gridsize; //x-value grid 2* what it was above
if (bGrids) fnPaintGridX(dADoub); //paint grids
fnPaintTickX(dADoub,1); //paint ticks
snprintf(szAString,sizeof(szAString),tickformat,dADoub); //tick labels .8g is the largest that will fit with full grid
if(strncmp(szAString,lasttick,sizeof(szAString))!=0 || (fi+2.0>fMaxGrid && iCount<2))
{// new tick label different to previous one , or last one and only printed 1 previously
++iCount;
AAnsiString=AnsiString(szAString);
fnKoord2Point(pPoint,dADoub,sScaleY.dMin);
ASize = pBitmap->Canvas->TextExtent(AAnsiString);
pBitmap->Canvas->Font->Color=ColText;
pBitmap->Canvas->Font->Size=iTextSize;
pBitmap->Canvas->TextOut(pPoint->x-ASize.cx/2,pPoint->y+iTextOffset,AAnsiString);
snprintf(lasttick,sizeof(szAString),"%s",szAString); // save this one as last printed , cannot use strncpy as that does not guarantee a null terminated string
}
}// end for
}
#else /* print 5 ticks values evenly spaced along x axis*/
{
for(double z=0;z<=1.000000001;z+=0.25) //location of tick 0,0.25,0.5,0.75,1, check at <=1.000000001 to allow for 1 with small rounding erros
{
dADoub = sScaleX.dMin+z*(sScaleX.dMax-sScaleX.dMin);
if (bGrids) fnPaintGridX(dADoub); //paint grids
fnPaintTickX(dADoub,1); //paint ticks
snprintf(szAString,sizeof(szAString),"%.10g",dADoub); //tick labels can add more resolution here as plenty of space
AAnsiString=AnsiString(szAString);
fnKoord2Point(pPoint,dADoub,sScaleY.dMin);
ASize = pBitmap->Canvas->TextExtent(AAnsiString);
pBitmap->Canvas->Font->Color=ColText;
pBitmap->Canvas->Font->Size=iTextSize;
pBitmap->Canvas->TextOutA(pPoint->x-2*ASize.cx/3,pPoint->y+iTextOffset,AAnsiString); // was -ASize/2
}
}
#endif
#pragma GCC diagnostic pop /* GCC diagnostic ignored "-Wformat-nonliteral" */
//y-axis
fMinGrid = ceil(sScaleY.dMin/dGridSizeY); //min grid
fMaxGrid = floor(sScaleY.dMax/dGridSizeY); //max grid
lasttick[0]=0; // zero length string to start so 1st label always printed
iCount=0; // nos ticks values printed
// rprintf("yaxis fMinGrid=%g fMaxGrid=%g iCount=%d\n",fMinGrid, fMaxGrid,iCount);
//paint grids
i=0;
for (double fi = fMinGrid; fi<=fMaxGrid && i< 100 ; fi=fi+1.0,++i) // && i< 100 stops looping forever if we run out of resolution
{
dADoub = fi * dGridSizeY; //y-value grid
if (bGrids) fnPaintGridY(dADoub); //paint grids
fnPaintTickY(dADoub,1); //paint ticks
#ifdef USE_double_to_str_exp
/* void double_to_str_exp(double x, int sf,enum fpout_type out_type, int len, char *s) // sf = significant figures - max 19 */
{int sf=12; // have space for at most 12 chars
if(dADoub<0) sf--; // negative sign takes 1
do{// try until it fits in <= 12 chars
double_to_str_exp(dADoub,sf--,round_nearest | fmt_g,sizeof(szAString),szAString);
}
while(strlen(szAString)>12 && sf>1); // && sf>1 traps infinite loop (just in case!)
}
#else
// gcvt(dADoub,10, szAString); // max 12 characters so 10 digits plus sign, dp
{int sf=12; // have space for at most 12 chars
if(dADoub<0) sf--; // negative sign takes 1
do{// try until it fits in <= 12 chars
gcvt(dADoub,sf--,szAString);
}
while(strlen(szAString)>12 && sf>1); // && sf>1 traps infinite loop (just in case!)
}
#endif
if(strncmp(szAString,lasttick,sizeof(szAString))!=0 || (fi+1.0>fMaxGrid && iCount<2))
{ // new tick label different to previous one , or last one and only printed 1 previously
++iCount;
AAnsiString=AnsiString(szAString);
fnKoord2Point(pPoint,sScaleX.dMin,dADoub);
ASize = pBitmap->Canvas->TextExtent(AAnsiString);
pBitmap->Canvas->Font->Color=ColText;
pBitmap->Canvas->Font->Size=iTextSize;
pBitmap->Canvas->TextOut(pPoint->x-ASize.cx-iTextOffset,pPoint->y-ASize.cy/2,AAnsiString);
snprintf(lasttick,sizeof(szAString),"%s",szAString); // save this one as last printed , cannot use strncpy as that does not guarantee a null terminated string
}
}
// rprintf("yaxis2 fMinGrid=%g fMaxGrid=%g iCount=%d\n",fMinGrid, fMaxGrid,iCount);
if(iCount==0)
{ // zoomed too much so no values printed above - just print 1 value here (mid)
dADoub = 0.5* (sScaleY.dMin+sScaleY.dMax); //y-value grid - just mid point
if(fMinGrid==fMaxGrid)
{ // add tick/grid line as code above will not have printed one
if (bGrids) fnPaintGridY(dADoub); //paint grids
fnPaintTickY(dADoub,1); //paint ticks
}
#ifdef USE_double_to_str_exp
/* void double_to_str_exp(double x, int sf,enum fpout_type out_type, int len, char *s) // sf = significant figures - max 19 */
{int sf=12; // have space for at most 12 chars
if(dADoub<0) sf--; // negative sign takes 1
do{// try until it fits in <= 12 chars
double_to_str_exp(dADoub,sf--,round_nearest | fmt_g,sizeof(szAString),szAString);
}
while(strlen(szAString)>12 && sf>1); // && sf>1 traps infinite loop (just in case!)
}
#else
{int sf=12; // have space for at most 12 chars
if(dADoub<0) sf--; // negative sign takes 1
do{// try until it fits in <= 12 chars
gcvt(dADoub,sf--,szAString);
}
while(strlen(szAString)>12 && sf>1); // && sf>1 traps infinite loop (just in case!)
}
#endif
AAnsiString=AnsiString(szAString);
fnKoord2Point(pPoint,sScaleX.dMin,dADoub);
ASize = pBitmap->Canvas->TextExtent(AAnsiString);
pBitmap->Canvas->Font->Color=ColText;
pBitmap->Canvas->Font->Size=iTextSize;
pBitmap->Canvas->TextOut(pPoint->x-ASize.cx-iTextOffset,pPoint->y-ASize.cy/2,AAnsiString);
}
//Zeroline
if (!bGrids & bZeroLine) //zeroline not necess. if
//grids are enabled
if (fnInScaleY(0)) //zeroline in plot?
{
fnKoord2Point(pPoint,sScaleX.dMin,0); //paint line in gridstyle
pBitmap->Canvas->PenPos=*pPoint;
fnKoord2Point(pPoint,sScaleX.dMax,0);
pBitmap->Canvas->Pen->Color = ColGrid;
pBitmap->Canvas->Pen->Width = iPenWidthGrid;
pBitmap->Canvas->Pen->Style = PSGrid;
pBitmap->Canvas->LineTo(pPoint->x,pPoint->y);
}
#if 0 /* set to 1 to print legend 1st, before traces (means it may not be visible) */
//Legend
//calc position
dX=dLegendStartX*(sScaleX.dMax
-sScaleX.dMin)+sScaleX.dMin
;
dY=dLegendStartY*(sScaleY.dMax
-sScaleY.dMin)+sScaleY.dMin
;
fnKoord2Point(pPoint,dX,dY); //calc. coordinat.
pBitmap->Canvas->Font->Size=iTextSize;
for (j=0; j<iNumberOfGraphs; j++) //all graphs
{
pAGraph = ((SGraph*) pHistory->Items[j]);
if (pAGraph->Caption!="")
{
*pPoint2=*pPoint;
if (((pAGraph->ucStyle) & 1) == 1) //paint data point
{ //for legend
i=pBitmap->Canvas->TextHeight(pAGraph->Caption);
i/=2;
pPoint->y+=i;
pPoint->x+=pBitmap->Canvas->TextWidth("22");
LayoutRect.Left=(pPoint->x)-(pAGraph->iSizeDataPoint/2);
LayoutRect.Right=(pPoint->x)+(pAGraph->iSizeDataPoint/2);
LayoutRect.Top=(pPoint->y)-(pAGraph->iSizeDataPoint/2);
LayoutRect.Bottom=(pPoint->y)+(pAGraph->iSizeDataPoint/2);
pBitmap->Canvas->Pen->Width=1;
pBitmap->Canvas->Pen->Color=pAGraph->ColDataPoint;
pBitmap->Canvas->Pen->Style=psSolid;
pBitmap->Canvas->Brush->Color=pAGraph->ColDataPoint;
fnPaintDataPoint(LayoutRect,pAGraph->ucPointStyle);
if (((pAGraph->ucStyle) & 4) == 4)
{
*pPoint=*pPoint2;
}
else
{
pPoint->y-=i;
pPoint->x+=pBitmap->Canvas->TextWidth("333");
pBitmap->Canvas->Font->Color=pAGraph->ColDataPoint;
}
}
if (((pAGraph->ucStyle) & 4) == 4) //paint short line
{ //for legend
i=pBitmap->Canvas->TextHeight(pAGraph->Caption);
i/=2;
pPoint->y+=i;
pBitmap->Canvas->PenPos=*pPoint;
pPoint->x+=pBitmap->Canvas->TextWidth("4444");
pBitmap->Canvas->Pen->Width=pAGraph->iWidthLine;;
pBitmap->Canvas->Pen->Color=pAGraph->ColLine;
pBitmap->Canvas->Pen->Style=pAGraph->LineStyle;
pBitmap->Canvas->LineTo(pPoint->x,pPoint->y);
pPoint->y-=i;
pPoint->x+=pBitmap->Canvas->TextWidth("1");
pBitmap->Canvas->Font->Color=pAGraph->ColLine;
}
pBitmap->Canvas->Font->Size=iTextSize; //paint caption
pBitmap->Canvas->TextOut(pPoint->x,pPoint->y,Utf8_to_w(pAGraph->Caption));
*pPoint=*pPoint2;
if ((pAGraph->iSizeDataPoint>pBitmap->Canvas->TextHeight("0"))&&
(((pAGraph->ucStyle) & 1) == 1))
pPoint->y+=pAGraph->iSizeDataPoint+5;
else pPoint->y+=pBitmap->Canvas->TextHeight("0");
}
}
#endif
//Clip Rect
HRGN MyRgn;
fnKoord2Point(pPoint2,sScaleX.dMax,sScaleY.dMax);
fnKoord2Point(pPoint,sScaleX.dMin,sScaleY.dMin);
// rprintf("Clipping region from X=%.20g Y=%.20g to X=%.20g Y=%.20g\n",(double)(pPoint2->x),(double)(pPoint2->y),(double)(pPoint->x),(double)(pPoint->y));
double x_width_pixels= (double)(pPoint2->x)-(double)(pPoint->x);
if(x_width_pixels<0) x_width_pixels= -x_width_pixels;
#if 1
MyRgn = ::CreateRectRgn(pPoint2->x,pPoint2->y,pPoint->x,pPoint->y);
#else
MyRgn = ::CreateRectRgn(pPoint->x,pPoint2->y,pPoint2->x,pPoint->y);
#endif
::SelectClipRgn(pBitmap->Canvas->Handle,MyRgn);
//Data points and Error Bars, lines
for (j = 0; j < iNumberOfGraphs; j++)
{
pAGraph = ((SGraph*) pHistory->Items[j]);
if (((pAGraph->ucStyle) & 1) == 1) //style: data point
{ unsigned int istep;
/* new, more intelligent way to display points
if we have to skip points, show min/max by an vertical "error bar"
so that range is obvious
If you zoom in enough just points are shown
*/
DOUBLE ymax,ymin,x_ymax,x_ymin; // used to capture features in skipped data
DOUBLE lastx,lasty;
double xd=sScaleX.dMax-sScaleX.dMin; // total span
double xi=xd/x_width_pixels; // use all the pixels available
xd=sScaleX.dMin-xi; // -xi as add xi before its used
iCount=pAGraph->nos_vals ;
#if 1
// do binary search to find start of area thats visible on the screen
ssize_t starti; // index just before start
{
ssize_t low=0;
ssize_t high=(ssize_t)iCount-1;
bool found=false;
double key=sScaleX.dMin; // needs to be double as otherwise compare midval<key can generate an overflow if dMin -? dMax is a very large range
ssize_t mid=0;
while(low<=high && !found)
{mid=low+((high-low)>>1); /* (low+high)/2 but written so cannot overflow */
double midVal=pAGraph->x_vals[mid];
if(midVal<key)
low=mid+1;
else if (midVal>key)
high=mid-1;
else
found=true; // mid is exact match
}
if(found) starti=mid;
else starti=low-1; // not found want 1 before
if(starti<0) starti=0; // ensure not before start (don't worry if its past the end as for loop below deals with that case)
}
for (size_t ii=(size_t)starti; ii<iCount; ii++) // was i+=step
#else
for (size_t ii=0; ii<iCount; ii++) // was i+=step
#endif
{
dX = pAGraph->x_vals[ii];
if(!fnInScaleX(dX))
{if(dX> sScaleX.dMax) break; // past end so all done for this trace
else continue; // PMi optimisation - skip values before xmin
// this is important when zooming in as otherwise code below will see the whole file and will "compress" the graph incorrectly
}
ymax=ymin=pAGraph->y_vals[ii];// dY
x_ymax=x_ymin=(float)dX;
if(zoom_fun_level)
{Application->ProcessMessages(); /* allow windows to update (but not go idle) - potentially causes recursion ! */
if(zoom_fun_level>1)
goto fnpaint_end;// > 1 means we have recursion , abort present update as we need to do another with different scaling
}
// we know scaling so we can calculate how many points we need to skip
xd+=xi; // this works better when "skip equal y values is set" as x values are not then evenly spaced and this way points selected are evenly spaced
dX = pAGraph->x_vals[ii]; // dX,dY is 1st point examined, lastx,lasty is last point in this "segment"
dY = pAGraph->y_vals[ii];
for(istep=1;ii+istep<iCount && pAGraph->x_vals[ii+istep]<xd ;++istep)
{lastx = pAGraph->x_vals[ii+istep];
lasty = pAGraph->y_vals[ii+istep];
if(lasty>ymax) {ymax=lasty;x_ymax=lastx;}
if(lasty<ymin) {ymin=lasty;x_ymin=lastx;}
}
ii+=istep-1;
bool show_main_pt=false;
if (fnKoord2Point(pPoint,dX,dY))
{ show_main_pt=true;
LayoutRect.Left=(pPoint->x)-(pAGraph->iSizeDataPoint/2);
LayoutRect.Right=(pPoint->x)+(pAGraph->iSizeDataPoint/2);
LayoutRect.Top=(pPoint->y)-(pAGraph->iSizeDataPoint/2);
LayoutRect.Bottom=(pPoint->y)+(pAGraph->iSizeDataPoint/2);
pBitmap->Canvas->Pen->Width=1;
pBitmap->Canvas->Pen->Color=pAGraph->ColDataPoint;
pBitmap->Canvas->Pen->Style=psSolid;
pBitmap->Canvas->Brush->Color=pAGraph->ColDataPoint;
fnPaintDataPoint(LayoutRect,pAGraph->ucPointStyle);
}
if (ymin!=ymax) // draw points at min and max (so we have 3 vertical points) [assuming they are far enough away to show ]
{
if( fnKoord2Point(pPoint2,x_ymin,ymin) && (!show_main_pt ||
(abs(pPoint->x-pPoint2->x)+ abs(pPoint->y-pPoint2->y) >iSkipLineLevel))
)
{ // if point is far enough away to be worthwhile drawing
LayoutRect.Left=(pPoint2->x)-(pAGraph->iSizeDataPoint/2);
LayoutRect.Right=(pPoint2->x)+(pAGraph->iSizeDataPoint/2);
LayoutRect.Top=(pPoint2->y)-(pAGraph->iSizeDataPoint/2);
LayoutRect.Bottom=(pPoint2->y)+(pAGraph->iSizeDataPoint/2);
pBitmap->Canvas->Pen->Width=1;
pBitmap->Canvas->Pen->Color=pAGraph->ColDataPoint;
pBitmap->Canvas->Pen->Style=psSolid;
pBitmap->Canvas->Brush->Color=pAGraph->ColDataPoint;
fnPaintDataPoint(LayoutRect,pAGraph->ucPointStyle);
}
if( fnKoord2Point(pPoint2,x_ymax,ymax) && (!show_main_pt ||
(abs(pPoint->x-pPoint2->x)+ abs(pPoint->y-pPoint2->y) >iSkipLineLevel))
)
{ // if point is far enough away to be worthwhile drawing
LayoutRect.Left=(pPoint2->x)-(pAGraph->iSizeDataPoint/2);
LayoutRect.Right=(pPoint2->x)+(pAGraph->iSizeDataPoint/2);
LayoutRect.Top=(pPoint2->y)-(pAGraph->iSizeDataPoint/2);
LayoutRect.Bottom=(pPoint2->y)+(pAGraph->iSizeDataPoint/2);
pBitmap->Canvas->Pen->Width=1;
pBitmap->Canvas->Pen->Color=pAGraph->ColDataPoint;
pBitmap->Canvas->Pen->Style=psSolid;
pBitmap->Canvas->Brush->Color=pAGraph->ColDataPoint;
fnPaintDataPoint(LayoutRect,pAGraph->ucPointStyle);
}
} // end if error "bar"
} // end for(ii)
} // end if (((pAGraph->ucStyle) & 1) == 1) (if style: data point)
if (((pAGraph->ucStyle)&4)==4) //style: line
{ unsigned int istep;
bool first=True; // used to trap start and end of region we wish to view (when zoomed)
bool last=False;
DOUBLE ymax,ymin;
double x_ymax,x_ymin; // used to capture features in skipped data (need to be double due to clipping)
DOUBLE lastx,lasty;
iCount=pAGraph->nos_vals;
pBitmap->Canvas->Pen->Width=pAGraph->iWidthLine;
pBitmap->Canvas->Pen->Color=pAGraph->ColLine;
pBitmap->Canvas->Pen->Style=pAGraph->LineStyle;
//iCount=pAList->Count;
if (iCount!=0)
{
dX = pAGraph->x_vals[0];
dY = pAGraph->y_vals[0];
fnKoord2Point(pPoint,dX,dY);
pBitmap->Canvas->PenPos=*pPoint;
*pPoint2=*pPoint;
}
double xd=sScaleX.dMax-sScaleX.dMin; // total span
double xi=xd/x_width_pixels; // use all the pixels available
xd=sScaleX.dMin-xi; // -xi as add xi before its used
#if 1
// do binary search to find start of area thats visible on the screen
ssize_t starti; // index just before start
{
ssize_t low=0;
ssize_t high=(ssize_t)iCount-1;
bool found=false;
double key=sScaleX.dMin; // without this being a double we get floating point overflow on midVal<key below when dMin->dMax is very large
ssize_t mid=0;
while(low<=high && !found)
{mid=low+((high-low)>>1); /* (low+high)/2 but written so cannot overflow */
double midVal=pAGraph->x_vals[mid];
if(midVal<key)
low=mid+1;
else if (midVal>key)
high=mid-1;
else
found=true; // mid is exact match
}
if(found) starti=mid;
else starti=low-1; // not found want 1 before
if(starti<0) starti=0; // ensure not before start (don't worry if its past the end as for loop below deals with that case)
}
for (size_t ii=(size_t)starti; ii<iCount; ii++) // start processing just where we need to.
#else
for (size_t ii=0; ii<iCount; ii++) // linear search from start
#endif
{
dX = pAGraph->x_vals[ii];
if(first && dX >sScaleX.dMin)
{ // 1st point after min x value - want to process this
}
else if(last==false && dX>sScaleX.dMax)
{ // 1st point after max x value - also want to process this
last=true;
}
else if(!fnInScaleX(dX))
{if(dX> sScaleX.dMax) break; // past end so all done for this trace
else continue; // PMi optimisation - skip values before xmin
// this is important when zooming in as otherwise code below will see the whole file and will "compress" the graph incorrectly
}
if(first)
{// first point to be displayed - need to define start of the 1st line
if(ii>0)
{xs= pAGraph->x_vals[ii-1];
ys =pAGraph->y_vals[ii-1];
}
else
{xs= pAGraph->x_vals[0];
ys = pAGraph->y_vals[0] ;
}
}
dX = pAGraph->x_vals[ii];
dY = pAGraph->y_vals[ii] ;
ymax=ymin=(float)dY;
x_ymin=x_ymax=(float)dX;
if(zoom_fun_level)
{Application->ProcessMessages(); /* allow windows to update (but not go idle) - potentially causes recursion ! */
if(zoom_fun_level>1)
goto fnpaint_end;// > 1 means we have recursion , abort present update as we need to do another with different scaling
}
// we know scaling so we can calculate how many points we need to skip
xd+=xi; // this works better when "skip equal y values is set" as x values are not then evenly spaced and this way points selected are evenly spaced
lastx=(float)dX ; // dX,dY is 1st point examined, lastx,lasty is last point in this "segment"
lasty=(float)dY ;
for(istep=1;ii+istep<iCount && pAGraph->x_vals[ii+istep]<xd ;++istep)
{lastx = pAGraph->x_vals[ii+istep];
lasty = pAGraph->y_vals[ii+istep];
if(lasty>ymax) {ymax=lasty;x_ymax=lastx;}
if(lasty<ymin) {ymin=lasty;x_ymin=lastx;}
}
ii+=istep-1;
{
if(x_ymin>x_ymax)
{double tx,ty; // swap around to make sure we stay in order of increasing x
tx=x_ymin;ty=ymin;
x_ymin=x_ymax; ymin=ymax;
x_ymax=tx; ymax=(float)ty;
}
// graph_line(double xe,double ye,double xmin,double xmax,double ymin,double ymax)
graph_line(x_ymin,ymin,sScaleX.dMin,sScaleX.dMax,sScaleY.dMin,sScaleY.dMax); // draw line (clipped)
if(ymin!=ymax)
{// print min and max if they are different (only happens when points skipped)
graph_line(x_ymax,ymax,sScaleX.dMin,sScaleX.dMax,sScaleY.dMin,sScaleY.dMax); // draw line (clipped)
}
if(lasty!=ymax)
{// end point of this region (if different)
graph_line(lastx,lasty,sScaleX.dMin,sScaleX.dMax,sScaleY.dMin,sScaleY.dMax); // draw line (clipped)
}
}
first=False;
}
}