I had to triple check. And it's late so I may still be wrong.

But it seems the x and y labels are flipped.

Here is a screenshot of a graph with the symptoms:

Here is a screenshot of the relevant graphing code snippet:

And just in case here is code with a single datapoint output:

So we know that radii are the larger numbers and are stored in vector radiusses (which I used for graphing x).

Also, great work, and thanks for making it opensource. I'm glad to see a multi-lingual graphing solution. I also appreciate the autoscaling and nan-ignoring it seems to do.

It would be nice to include a method where multiple graphs using different data can be included on a single png ie multiple lines displaying different data,
An additional change would be allowing users to have both linear interpolation and the Points for easier viewing.

Hi,

I followed this tutorial in order to be able to plot data in my c++ project. I am using QtCreator and my project is a catkin package (i.e. is defined by CMakeLists.txt and package.xml files).

When compiling this simple code of the tutorial I get

‘vector’ was not declared in this scope
     vector<double> x{-2, -1, 0, 1, 2};
     ^~~~~~`

After replacing vector with std::vector my code compiles, but there is no .png file generated.

Do you have any idea what may be the problem?

Thanks

This seems like a useful library. I am a C coder/user. C in here is unfortunately in need of some improvements. Few examples.

What is the point of double as an argument to malloc, for example

// pbPlots.c line 127
colors = (RGBA**)malloc(sizeof(RGBA) * 8.0);

That of course produces a lot of warnings

1>~\pbPlots-0.1.7.1\C\pbPlots.c(127,45): warning C4244: 'function': conversion from 'double' to 'size_t', possible loss of data

1. standard C is C11.
2. these days one does

// this is VMT not VLA
colors =  malloc( sizeof( RGBA[8] ) );

Next. There is even code like this one:

// line 151
reference->image->x = (RGBABitmap**)malloc(sizeof(RGBABitmap) * 0.0);
// same as
reference->image->x = NULL ;
// or is it? it depends on the implementation

Next. This code is all heap-based. Stack-based code tends to be faster. But that requires refactoring.
There are dozens of unnecessary heap allocations. As an example CreateRectangle (line:168) is much faster in this form:

// C struct copy elision is very fast, return by value when making struct instances
Rectangle reateRectangle(double x1, double y1, double x2, double y2){
  Rectangle r = {  .x1 = x1, y1 = y1, .x2 = x2, .y2 = y2 } ;
  return r;
}

Also in standard C, there is no need to cast the allocation results. There are much more opportunities for improvement.

I assume all is known and this code will be improved.

#include "pbPlots.hpp"
#include "supportLib.hpp"

//library from pbplots, https://github.com/InductiveComputerScience/pbPlots

using namespace std;

int main(){
bool success;
StringReference *errorMessage = CreateStringReferenceLengthValue(0, L' ');
RGBABitmapImageReference *imageReference = CreateRGBABitmapImageReference();

vector<double> ys{2, -1, -2, -1, 2};

BarPlotSeries *series = GetDefaultBarPlotSeriesSettings();
series->ys = &ys;


BarPlotSettings *settings = GetDefaultBarPlotSettings();
settings->width = 800;
settings->height = 600;
settings->title = toVector(L"something");
settings->yLabel = toVector(L"Price");
settings->barPlotSeries->push_back(series);

settings->autoLabels = false;
settings->xLabels = new vector (5.0);
settings->xLabels->at(0) = CreateStringReference(toVector(L"product1"));
settings->xLabels->at(1) = CreateStringReference(toVector(L"product2"));
settings->xLabels->at(2) = CreateStringReference(toVector(L"product3"));
settings->xLabels->at(3) = CreateStringReference(toVector(L"product4"));
settings->xLabels->at(4) = CreateStringReference(toVector(L"product5"));

/*
*/

success = DrawBarPlotFromSettings(imageReference, settings, errorMessage);

if(success){
	vector<double> *pngdata = ConvertToPNG(imageReference->image);
	WriteToFile(pngdata, "example3.png");
	DeleteImage(imageReference->image);
}else{
	cerr << "Error: ";
	for(wchar_t c : *errorMessage->string){
		wcerr << c;
	}
	cerr << endl;
}

FreeAllocations();

return success ? 0 : 1;

}

ive copied the examples and the bargraph without x axis labels work, but when i copied the code for it it doesnt run.
i used replit .

error:
sh -c make -s
./main.cpp:26:27: error: use of class template 'vector' requires template arguments
settings->xLabels = new vector (5.0);
^
/nix/store/dlni53myj53kx20pi4yhm7p68lw17b07-gcc-10.3.0/include/c++/10.3.0/bits/stl_vector.h:389:11: note: template is declared here
class vector : protected _Vector_base<_Tp, _Alloc>
^
1 error generated.
make: *** [Makefile:10: main] Error 1
exit status 2

Hello, I have recently been working on a simple SIR Epidemic Simulation, and wanted to use pbPlots to visualize the data. Unfortunately, I can't get it to work correctly. Every time I run my code and go to open the png file, it just says that the file is unreadable or corrupted. I also noticed that the file size is only 65 bytes, which is smaller than the usual 180KB.

Here's my code:

/*
	Brandon Pyle
	SIR Epidemic Simulation

	This program is a simple customizable epidemic simulation that uses the SIR model
*/

//Include statements
#include <string>
#include <iostream>
#include <iomanip>
#include <vector>
#include "pbPlots.hpp"
#include "supportLib.hpp"

using namespace std;

//Function prototypes

int main()
{
	//The following block of code creates the title box in the command line
	for (int i = 0; i < 50; i++)
		cout << "*";
	cout << endl << setw(49) << left << "*" << right << "*" << endl;
	cout << "*                  Brandon Pyle                  *" << endl;
	cout << "*            SIR Epidemic Simulation             *";
	cout << endl << setw(49) << left << "*" << right << "*" << endl;
	for (int i = 0; i < 50; i++)
		cout << "*";

	cout << endl << endl;

	//Variable Declarations
	int numDays;
	int population;
	double infectionRate = 0.0002; //Percent of other people a person can infect
	double recoveryRate = 10; //In days

	cout << "Enter the length of the simulation in days: ";
	cin >> numDays;

	cout << endl << "Enter the population number for the simulation: ";
	cin >> population;

	if (population > 5000)
		cout << "WARNING: Numbers greater than 5000 may result in incorrect or inaccurate results." << endl;
	else
		cout << endl;

	vector<double> S(population, 0.0); //Number of Susceptible People
	vector<double> I(population, 0.0); //Number of Infected People
	vector<double> R(population, 0.0); //Number of Removed People

	vector<double> xPos;
	for (double i = 0.0; i < numDays; i++)
		xPos.push_back(i);

	I[0] = 1; //Starts the simulation with 6 infected people
	S[0] = population - I[0]; //Initial number of susceptible people
	R[0] = 0; //Initial number of removed people

	RGBABitmapImageReference* imageReference = CreateRGBABitmapImageReference();

	cout << setw(5) << right << "Day";
	cout << setw(13) << right << "Susceptible";
	cout << setw(10) << right << "Infected";
	cout << setw(9) << right << "Removed" << endl;

	for (int i = 0; i < numDays; i++)
	{
		cout << setw(5) << right << i + 1;
		cout << setw(13) << right << fixed << setprecision(0) << S[i];
		cout << setw(10) << right << fixed << setprecision(0) << I[i];
		cout << setw(9) << right << fixed << setprecision(0) << R[i] << endl << endl;

		S[i + 1] = S[i] - infectionRate * S[i] * I[i];
		I[i + 1] = I[i] + infectionRate * S[i] * I[i] - I[i] / recoveryRate;
		R[i + 1] = R[i] + I[i] / recoveryRate;
	}

	ScatterPlotSeries* series = GetDefaultScatterPlotSeriesSettings();
	series->xs = &xPos;
	series->ys = &S;
	series->linearInterpolation = false;
	series->lineType = toVector(L"solid");
	series->color = CreateRGBColor(0, 0, 1);
	
	ScatterPlotSeries* series2 = GetDefaultScatterPlotSeriesSettings();
	series->xs = &xPos;
	series->ys = &I;
	series->linearInterpolation = false;
	series->lineType = toVector(L"solid");
	series->color = CreateRGBColor(0, 1, 0);

	ScatterPlotSeries* series3 = GetDefaultScatterPlotSeriesSettings();
	series->xs = &xPos;
	series->ys = &R;
	series->linearInterpolation = false;
	series->lineType = toVector(L"solid");
	series->color = CreateRGBColor(0, 0, 0);

	ScatterPlotSettings *settings = GetDefaultScatterPlotSettings();
	settings->width = 800;
	settings->height = 480;
	settings->autoBoundaries = true;
	settings->autoPadding = true;
	settings->title = toVector(L"SIR Epidemic Simulation");
	settings->xLabel = toVector(L"Days");
	settings->yLabel = toVector(L"Population");
	settings->scatterPlotSeries->push_back(series);
	settings->scatterPlotSeries->push_back(series2);
	settings->scatterPlotSeries->push_back(series3);

	DrawScatterPlotFromSettings(imageReference, settings);

	//DrawScatterPlot(imageReference, 800, 480, &I, &S);
	
	vector<double>* pngData = ConvertToPNG(imageReference->image);
	WriteToFile(pngData, "SIR_Graph_Test.png");
	DeleteImage(imageReference->image);

	return 0;
}

I have narrowed down the issue to be something with the xPos vector, but I can't figure out why it isn't working. Also, the program does work if you comment out all of the ScatterPlotSeries stuff and uncomment the DrawScatterPlot(...); line. This method works because it uses the I vector for the X axis instead of my xPos vector.

Any suggestions?

I am not sure if I should put this here or not, but I am not finding any info when google searching nor can I find the mehtod located anywhere in the files the insturctions have you download when setting up pbPlots so I am curious how to use or where to I find the FreeAllocations() method that is being called in the examples? Thanks for any help with this and my apologizes that it is probably not a real issue just a question I am trying to find an answer to.

Great work on this library by the way, I find it very useful.

warnings.txt

I'm using vs2019 and had issue with pbPlots.cpp/.hpp. They are using namespace std and vs used rectangle from wingdi.h instead of local rectangle.
Solved by changing rectangle on rectangle_pbPlots in all files.

The library is working correctly however how to insert a border, grid-on/off and auto marker? Can you please include documentation with respect to C++.

Like this

I can draw graph thanks to your libraries but when i try to import the png into my program it misses the bottom part of it :

What i find strange its the fact that when i close my app it finish to generate the png :

When I try to plot vector of all zeros it shows the following error
It also shows same error for any other value than 0.
terminate called after throwing an instance of 'std::length_error' what(): cannot create std::vector larger than max_size() Aborted (core dumped)

Here's the code

#include "pbPlots/supportLib.hpp"
#include "pbPlots/pbPlots.hpp"

using namespace std;

vector<double> get_p_axis(double step_size){
	int length = 1/step_size + 1.0;
	vector<double> p(length);

	int start = 0;
	for(int i = 0; i<length;i++)
		p[start++] = step_size*i;

	return p;
}

int main(){
	vector <double> p,H_of_p;
	p = get_p_axis(0.001);
	H_of_p.resize(p.size(),0);

	ScatterPlotSeries *series = GetDefaultScatterPlotSeriesSettings();
	series->xs = &p;
	series->ys = &H_of_p;
	series->linearInterpolation = true;
	series->lineType = toVector(L"dashed");
	series->lineThickness = 2;
	series->color = GetGray(0.3);


	ScatterPlotSettings *settings = GetDefaultScatterPlotSettings();
	settings->width = 600;
	settings->height = 400;
	settings->autoBoundaries = true;
	settings->autoPadding = true;
	settings->title = toVector(L"Cross Entropy");
	settings->xLabel = toVector(L"q");
	settings->yLabel = toVector(L"H(q)");
	settings->scatterPlotSeries->push_back(series);

	RGBABitmapImageReference *imageRef = CreateRGBABitmapImageReference();
	DrawScatterPlotFromSettings(imageRef,settings);
	
	vector<double> *png_data = ConvertToPNG(imageRef->image);
	WriteToFile(png_data,"Assn1_B.png");
	DeleteImage(imageRef->image);

	return 0;	
}```

Hello, I am a student and I have a little problem, in my school we need to graph a function and I want to know I can Draw the graph without a line. For example I have this graph and have two lines one of these is the line that I draw and i dont want the other line

I am a relatively new C programmer and am trying to run the pbPlots example 1 under the old (and free) Visual Studio 2010 C IDE. If I am interpretting the error messages correctly, it appears that pbPlots' source file "supportlib.c" makes use of the "FILE" type in a manner incompatible with how its defined in VS2010's header file "stdio.h". I am trying to include a screen grab (with the offending complaint highlighted in yellow) along with this Issue here but I'm not sure I attached it herein correctly... we'll see.

Bottom line, I have no idea whatsoever as to how to even approach this hiccup. Thoughts/suggestions?

My code:

RGBABitmapImageReference *imageReference = CreateRGBABitmapImageReference();
    vector<double> xs = vector<double>();
    for(int i = 1; i<turn;i++){
        xs.push_back(i);
    }
    vector<double> ys = vector<double>();
    for(int a : s.totalpopulation)
        ys.push_back(a);
    DrawScatterPlot(imageReference, 600, 400, &xs,
                    &ys);

    vector<double> *pngdata = ConvertToPNG(imageReference->image);
    WriteToFile(pngdata, "example1.png");
    DeleteImage(imageReference->image);

The s.totalpopulation is in vector<int>

The exception:

How can i fix this, thanks.

Env:
win10 x64
MSVC
I add the cpp file into my cmake file

How to change the font size and font type for legend and axis?

Hi guys, I'm trying the c++ version, I was wondering if legends are supported. I can't find any reference in the source code, so I think that they are not supported.

In some unknown conditions PNum variable inside ComputeGridLinePositions() is getting value NaN, which causes exception Vector too long. Its appearing randomly.

Hello,

I am using pbplots as per the tutorial:
https://github.com/InductiveComputerScience/pbPlots/blob/master/Cpp/example1.cpp
For this new version.

The first error I get is :

error: ‘FreeAllocations’ was not declared in this scope
     FreeAllocations();

If I comment it out, I get the error:

terminate called after throwing an instance of 'std::bad_alloc'
  what():  std::bad_alloc
Aborted (core dumped)

This is my CMake file:

cmake_minimum_required(VERSION 3.0.2)
project(Canoo)

set(CMAKE_BUILD_TYPE Debug)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")

#SET( EIGEN3_INCLUDE_DIR "$ENV{EIGEN3_INCLUDE_DIR}" )
#SET( CMAKE_MODULE_PATH "$ENV{EIGEN3_DIR}" )

find_package(Eigen3 REQUIRED )

link_directories(${Eigen_INCLUDE_DIRS})

# include_directories is needed for the compiler to know where looking for Eigen3 header files to be included 
include_directories( "${CMAKE_CURRENT_SOURCE_DIR}/pbplots" )

add_executable(solution main.cpp pbplots/pbPlots.cpp pbplots/supportLib.cpp)

#target_link_libraries(solution eigen)

I kept all the pbplots cpp and hpp in pbplots folder in my current directory. I have no trouble in completion. But execution is trouble.

Whats the problem? though I am following exactly in the tutorial.

My program is working but do not gave me back PNG file Wykres f.zip

https://raw.githubusercontent.com/InductiveComputerScience/pbPlots/master/README.md

1. Have a single library for plotting that is stable accross programming languagues and over time.

languagues languages

When using color in scatterplot series half the image gets covered by grey coincidentally where the data points start.
as shown in the below example, The language used is C

I don't understand what this function does and why this string is included but it prevents Visual Studio from compiling.

It causes a C2026 error code "string too big, trailing character truncated."

Hello,

My code compiles perfectly but no png file is created.
Here the method supposed to plot the curve :

`void Sol::draw_sol_init(){
bool sucess;
StringReference *errorMessage = new StringReference();
RGBABitmapImageReference *imageRef = CreateRGBABitmapImageReference();
// m_space, m_sol_init are two vector with the same size
sucess = DrawScatterPlot(imageRef, 600, 400, &m_space, &m_sol_init, errorMessage);

if(sucess){
    std::vector<double> *pngdata = ConvertToPNG((*imageRef).image);
    WriteToFile(pngdata, "sol_init.png");
    DeleteImage((*imageRef).image);
    std::cout << "test"  <<std::endl;
}
else{
    std::cout << "nsm" << std::endl;
}

}`

and here my all project
Mesh.zip

Thank you in advance for your help.

#include "pbPlots.hpp"
#include "supportLib.hpp"

using namespace std;

int main(){
bool success;
StringReference *errorMessage = new StringReference();
RGBABitmapImageReference *imageReference = CreateRGBABitmapImageReference();

vector<double> xs{-2, -1, 0, 1, 2};
vector<double> ys{2, -1, -2, -1, 2};
cout<<"only here";
success = DrawScatterPlot(imageReference, 600, 400, &xs, &ys, errorMessage);
cout<<"only here";
if(success){
    vector<double> *pngdata = ConvertToPNG(imageReference->image);
  cout<< "Working here";
    WriteToFile(pngdata, "example1.png");
    DeleteImage(imageReference->image);
}else{
    cerr << "Error: ";
    for(wchar_t c : *errorMessage->string){
        wcerr << c;
    }
    cerr << endl;
}

return success ? 0 : 1;

}

ERROR: terminate called after throwing an instance of 'std::out_of_range'
what(): vector::_M_range_check: __n (which is 4294967295) >= this->size() (which is 36)