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(C++) PlotSurface

ASCII art code snippet that displays a 2D (y-x-ordered) std::vector of double as a surface chart using ASCII art characters (see an example below the code).

PlotSurface uses GetAsciiArtGradient, MinElement and MaxElement.

* View the code of 'PlotSurface' in plain text.

#include <vector>

#include <cassert>

#include <algorithm>

#include <iostream>

#include <cmath>

//The 2D std::vector must be y-x-ordered

//From http://www.richelbilderbeek.nl/CppPlotSurface.htm

void PlotSurface(const std::vector<std::vector<double> >& v)

{

assert(v.empty() == false && "Surface must have a size");

assert(v[0].size() > 0 && "Surface must have a two-dimensional size");

//Obtain the ASCII art gradient and its size

static const std::vector<char> asciiArtGradient = GetAsciiArtGradient();

static const int nAsciiArtGradientChars = asciiArtGradient.size();

//Minimum and maximum are not given, so these need to be calculated

const double minVal = MinElement(v);

const double maxVal = MaxElement(v);

assert(minVal != maxVal);

//Draw the pixels

//Iterator through all rows

const std::vector<std::vector<double> >::const_iterator rowEnd = v.end();

for (std::vector<std::vector<double> >::const_iterator row = v.begin();

row != rowEnd;

++row)

{

//Iterate through each row's collumns

const std::vector<double>::const_iterator colEnd = row->end();

for (std::vector<double>::const_iterator col = row->begin();

col != colEnd;

++col)

{

//Scale the found grey value to an ASCII art character

assert(maxVal - minVal != 0.0);

const double greyValueDouble = ( (*col) - minVal) / (maxVal - minVal);

assert(greyValueDouble >= 0.0 && greyValueDouble <= 1.0);

const int greyValueInt = greyValueDouble * nAsciiArtGradientChars;

const int greyValue

= ( greyValueInt < 0

? 0 : (greyValueInt > nAsciiArtGradientChars - 1

? nAsciiArtGradientChars - 1: greyValueInt) );

assert(greyValue >= 0 && greyValue < nAsciiArtGradientChars);

std::cout << asciiArtGradient[greyValue];

}

std::cout << std::endl;

}

}

Example

` ``.--://+oossyyyyyyyyssoo+//:--.`` ``.--:/++oossyyyyyyyysso

`` ``..--://++osssyyyyyyyssso++/::--.``` ``..--://++osssyyyyyyyssoo

``````````..--::/++oosssyyyyyysssoo++/::--..``````````..--::/++oosssyyyyyysssoo

..`````...---://++oossssyyyyyssssoo++//:---...`````...---://++oosssyyyyyyssssoo

-......----:://++oossssyyyyyyssssoo++//::----......----:://++oossssyyyyyyssssoo

-------:::://+++oossssyyyyyyyssssoo+++//::::-------:::://+++oosssyyyyyyyyssssoo

::::::////+++ooossssyyyyyyyyyyssssoo+++/////::::::////+++ooossssyyyyyyyyyysssso

/////+++++oooossssyyyyyyyyyyyyyssssoooo+++++/////+++++oooossssyyyyyyyyyyyyyssss

oooooooooosssssyyyyyyyyhhyyyyyyyysssssoooooooooooooooosssssyyyyyyyyhhyyyyyyyyss

sssssssssssyyyyyyyyhhhhhhhhhyyyyyyyysssssssssssssssssssyyyyyyyyhhhhhhhhhyyyyyyy

yyyyyyyyyyyyyhhhhhhhhhhhhhhhhhhhhyyyyyyyyyyyyyyyyyyyyyyyyhhhhhhhhhhhhhhhhhhhhyy

hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

dddddddddddhhhhhhhhhhhhhhhhhhhhhhddddddddddddddddddddddhhhhhhhhhhhhhhhhhhhhhhdd

mmmmmmddddddddhhhhhhhhhhhhhhhddddddddmmmmmmmmmmmmmddddddddhhhhhhhhhhhhhhhdddddd

NNNmmmmmmdddddhhhhhhhhhhhhhhdddddmmmmmmNNNNNNNNmmmmmmdddddhhhhhhhhhhhhhhdddddmm

NNNNNmmmmddddhhhhhhyyyhhhhhhddddmmmmNNNNNNNNNNNNNmmmmddddhhhhhhyyyhhhhhhddddmmm

MMNNNNmmmdddhhhyyyyyyyyyyhhhdddmmmNNNNMMMMMMMMNNNNmmmdddhhhyyyyyyyyyyhhhdddmmmN

MMMNNNmmdddhhyyyyysssyyyyyhhdddmmNNNMMMMMMMMMMMNNNmmddhhhyyyyysssyyyyyhhdddmmNN

MMNNNmmddhhyyyssssssssssyyyhhddmmNNNMMMMMMMMMMNNNmmddhhyyyssssssssssyyyhhddmmNN

MMNNmmddhhyysssooooooosssyyhhddmmNNMMMMMMMMMMMNNmmddhhyysssooooooosssyyhhddmmNN

MNNmmddhyyssooo++++++ooossyyhddmmNNMMMMMMMMMMNNmmddhyyssooo++++++ooossyyhddmmNN

NNmmdhhyssoo++///////++oossyhhdmmNNMMMMMMMMMNNmmdhhyssoo++///////++oossyhhdmmNN

Nmddhyysoo++//:::::://++oosyyhddmNNNMMMMMMNNNmddhyysoo++//:::::://++oosyyhddmNN

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