#include "openmc/plot.h"

#include <algorithm>

#include <cmath>

#include <cstdio>

#include <fstream>

#include <sstream>

#include "openmc/tensor.h"

#include <fmt/core.h>

#include <fmt/ostream.h>

#ifdef USE_LIBPNG

#include <png.h>

#endif

#include "openmc/cell.h"

#include "openmc/constants.h"

#include "openmc/container_util.h"

#include "openmc/dagmc.h"

#include "openmc/error.h"

#include "openmc/file_utils.h"

#include "openmc/geometry.h"

#include "openmc/hdf5_interface.h"

#include "openmc/material.h"

#include "openmc/mesh.h"

#include "openmc/message_passing.h"

#include "openmc/openmp_interface.h"

#include "openmc/output.h"

#include "openmc/particle.h"

#include "openmc/progress_bar.h"

#include "openmc/random_lcg.h"

#include "openmc/settings.h"

#include "openmc/simulation.h"

#include "openmc/string_utils.h"

#include "openmc/tallies/filter.h"

namespace openmc {

//==============================================================================

// Constants

//==============================================================================

constexpr int PLOT_LEVEL_LOWEST {-1}; //!< lower bound on plot universe level

constexpr int32_t NOT_FOUND {-2};

constexpr int32_t OVERLAP {-3};

IdData::IdData(size_t h_res, size_t v_res, bool /*include_filter*/)

: data_({v_res, h_res, 3}, NOT_FOUND)

{}

void IdData::set_value(size_t y, size_t x, const Particle& p, int level,

Filter* /*filter*/, FilterMatch* /*match*/)

{

// set cell data

if (p.n_coord() <= level) {

data_(y, x, 0) = NOT_FOUND;

data_(y, x, 1) = NOT_FOUND;

} else {

data_(y, x, 0) = model::cells.at(p.coord(level).cell())->id_;

data_(y, x, 1) = level == p.n_coord() - 1

? p.cell_instance()

: cell_instance_at_level(p, level);

}

// set material data

Cell* c = model::cells.at(p.lowest_coord().cell()).get();

if (p.material() == MATERIAL_VOID) {

data_(y, x, 2) = MATERIAL_VOID;

} else if (c->type_ == Fill::MATERIAL) {

Material* m = model::materials.at(p.material()).get();

data_(y, x, 2) = m->id_;

}

}

void IdData::set_overlap(size_t y, size_t x, int /*overlap_idx*/)

{

for (size_t k = 0; k < data_.shape(2); ++k)

data_(y, x, k) = OVERLAP;

}

PropertyData::PropertyData(size_t h_res, size_t v_res, bool /*include_filter*/)

: data_({v_res, h_res, 2}, NOT_FOUND)

{}

void PropertyData::set_value(size_t y, size_t x, const Particle& p, int level,

Filter* /*filter*/, FilterMatch* /*match*/)

{

Cell* c = model::cells.at(p.lowest_coord().cell()).get();

data_(y, x, 0) = (p.sqrtkT() * p.sqrtkT()) / K_BOLTZMANN;

data_(y, x, 1) = c->density(p.cell_instance());

}

void PropertyData::set_overlap(size_t y, size_t x, int /*overlap_idx*/)

{

data_(y, x) = OVERLAP;

}

//==============================================================================

// RasterData implementation

//==============================================================================

RasterData::RasterData(size_t h_res, size_t v_res, bool include_filter)

: id_data_({v_res, h_res, include_filter ? 4u : 3u}, NOT_FOUND),

property_data_({v_res, h_res, 2}, static_cast<double>(NOT_FOUND)),

include_filter_(include_filter)

{}

void RasterData::set_value(size_t y, size_t x, const Particle& p, int level,

Filter* filter, FilterMatch* match)

{

// set cell data

if (p.n_coord() <= level) {

id_data_(y, x, 0) = NOT_FOUND;

id_data_(y, x, 1) = NOT_FOUND;

} else {

id_data_(y, x, 0) = model::cells.at(p.coord(level).cell())->id_;

id_data_(y, x, 1) = level == p.n_coord() - 1

? p.cell_instance()

: cell_instance_at_level(p, level);

}

// set material data

Cell* c = model::cells.at(p.lowest_coord().cell()).get();

if (p.material() == MATERIAL_VOID) {

id_data_(y, x, 2) = MATERIAL_VOID;

} else if (c->type_ == Fill::MATERIAL) {

Material* m = model::materials.at(p.material()).get();

id_data_(y, x, 2) = m->id_;

}

// set filter index (only if filter is being used)

if (include_filter_ && filter) {

filter->get_all_bins(p, TallyEstimator::COLLISION, *match);

if (match->bins_.empty()) {

id_data_(y, x, 3) = -1;

} else {

id_data_(y, x, 3) = match->bins_[0];

}

match->bins_.clear();

match->weights_.clear();

}

// set temperature (in K)

property_data_(y, x, 0) = (p.sqrtkT() * p.sqrtkT()) / K_BOLTZMANN;

// set density (g/cm³)

if (c->type_ != Fill::UNIVERSE && p.material() != MATERIAL_VOID) {

property_data_(y, x, 1) = c->density(p.cell_instance());

}

}

void RasterData::set_overlap(size_t y, size_t x, int overlap_idx)

{

// Set cell, instance, and material to OVERLAP, but preserve filter bin for

// tally plotting. Cell encodes the overlap index as a negative number so that

// it can be used to look up overlap information in the plotter.

id_data_(y, x, 0) = OVERLAP - overlap_idx - 1;

id_data_(y, x, 1) = OVERLAP;

id_data_(y, x, 2) = OVERLAP;

property_data_(y, x, 0) = OVERLAP;

property_data_(y, x, 1) = OVERLAP;

}

//==============================================================================

// Global variables

//==============================================================================

namespace model {

std::unordered_map<int, int> plot_map;

vector<std::unique_ptr<PlottableInterface>> plots;

uint64_t plotter_seed = 1;

} // namespace model

//==============================================================================

// RUN_PLOT controls the logic for making one or many plots

//==============================================================================

extern "C" int openmc_plot_geometry()

{

for (auto& pl : model::plots) {

write_message(5, "Processing plot {}: {}...", pl->id(), pl->path_plot());

pl->create_output();

}

return 0;

}

void PlottableInterface::write_image(const ImageData& data) const

{

#ifdef USE_LIBPNG

output_png(path_plot(), data);

#else

output_ppm(path_plot(), data);

#endif

}

void Plot::create_output() const

{

if (PlotType::slice == type_) {

// create 2D image

ImageData image = create_image();

write_image(image);

} else if (PlotType::voxel == type_) {

// create voxel file for 3D viewing

create_voxel();

}

}

void Plot::print_info() const

{

// Plot type

if (PlotType::slice == type_) {

fmt::print("Plot Type: Slice\n");

} else if (PlotType::voxel == type_) {

fmt::print("Plot Type: Voxel\n");

}

// Plot parameters

fmt::print("Origin: {} {} {}\n", origin_[0], origin_[1], origin_[2]);

if (PlotType::slice == type_) {

fmt::print("Width: {:4} {:4}\n", width_[0], width_[1]);

} else if (PlotType::voxel == type_) {

fmt::print("Width: {:4} {:4} {:4}\n", width_[0], width_[1], width_[2]);

}

if (PlotColorBy::cells == color_by_) {

fmt::print("Coloring: Cells\n");

} else if (PlotColorBy::mats == color_by_) {

fmt::print("Coloring: Materials\n");

}

if (PlotType::slice == type_) {

switch (basis_) {

case PlotBasis::xy:

fmt::print("Basis: XY\n");

break;

case PlotBasis::xz:

fmt::print("Basis: XZ\n");

break;

case PlotBasis::yz:

fmt::print("Basis: YZ\n");

break;

}

fmt::print("Pixels: {} {}\n", pixels()[0], pixels()[1]);

} else if (PlotType::voxel == type_) {

fmt::print("Voxels: {} {} {}\n", pixels()[0], pixels()[1], pixels()[2]);

}

}

void read_plots_xml()

{

// Check if plots.xml exists; this is only necessary when the plot runmode is

// initiated. Otherwise, we want to read plots.xml because it may be called

// later via the API. In that case, its ok for a plots.xml to not exist

std::string filename = settings::path_input + "plots.xml";

if (!file_exists(filename) && settings::run_mode == RunMode::PLOTTING) {

fatal_error(fmt::format("Plots XML file '{}' does not exist!", filename));

}

write_message("Reading plot XML file...", 5);

// Parse plots.xml file

pugi::xml_document doc;

doc.load_file(filename.c_str());

pugi::xml_node root = doc.document_element();

read_plots_xml(root);

}

void read_plots_xml(pugi::xml_node root)

{

for (auto node : root.children("plot")) {

std::string plot_desc = "<auto>";

if (check_for_node(node, "id")) {

plot_desc = get_node_value(node, "id", true);

}

if (check_for_node(node, "type")) {

std::string type_str = get_node_value(node, "type", true);

if (type_str == "slice") {

model::plots.emplace_back(

std::make_unique<Plot>(node, Plot::PlotType::slice));

} else if (type_str == "voxel") {

model::plots.emplace_back(

std::make_unique<Plot>(node, Plot::PlotType::voxel));

} else if (type_str == "wireframe_raytrace") {

model::plots.emplace_back(

std::make_unique<WireframeRayTracePlot>(node));

} else if (type_str == "solid_raytrace") {

model::plots.emplace_back(std::make_unique<SolidRayTracePlot>(node));

} else {

fatal_error(fmt::format(

"Unsupported plot type '{}' in plot {}", type_str, plot_desc));

}

model::plot_map[model::plots.back()->id()] = model::plots.size() - 1;

} else {

fatal_error(fmt::format("Must specify plot type in plot {}", plot_desc));

}

}

}

void free_memory_plot()

{

model::plots.clear();

model::plot_map.clear();

}

// creates an image based on user input from a plots.xml <plot>

// specification in the PNG/PPM format

ImageData Plot::create_image() const

{

size_t width = pixels()[0];

size_t height = pixels()[1];

ImageData data({width, height}, not_found_);

// generate ids for the plot

auto ids = get_map<IdData>();

// assign colors

for (size_t y = 0; y < height; y++) {

for (size_t x = 0; x < width; x++) {

int idx = color_by_ == PlotColorBy::cells ? 0 : 2;

auto id = ids.data_(y, x, idx);

// no setting needed if not found

if (id == NOT_FOUND) {

continue;

}

if (id == OVERLAP) {

data(x, y) = overlap_color_;

continue;

}

if (PlotColorBy::cells == color_by_) {

data(x, y) = colors_[model::cell_map[id]];

} else if (PlotColorBy::mats == color_by_) {

if (id == MATERIAL_VOID) {

data(x, y) = WHITE;

continue;

}

data(x, y) = colors_[model::material_map[id]];

} // color_by if-else

}

}

// draw mesh lines if present

if (index_meshlines_mesh_ >= 0) {

draw_mesh_lines(data);

}

return data;

}

void PlottableInterface::set_id(pugi::xml_node plot_node)

{

int id {C_NONE};

if (check_for_node(plot_node, "id")) {

id = std::stoi(get_node_value(plot_node, "id"));

}

try {

set_id(id);

} catch (const std::runtime_error& e) {

fatal_error(e.what());

}

}

void PlottableInterface::set_id(int id)

{

if (id < 0 && id != C_NONE) {

throw std::runtime_error {fmt::format("Invalid plot ID: {}", id)};

}

if (id == C_NONE) {

id = 1;

for (const auto& p : model::plots) {

id = std::max(id, p->id() + 1);

}

}

if (id_ == id)

return;

// Check to make sure this ID doesn't already exist

if (model::plot_map.find(id) != model::plot_map.end()) {

throw std::runtime_error {

fmt::format("Two or more plots use the same unique ID: {}", id)};

}

id_ = id;

}

// Checks if png or ppm is already present

bool file_extension_present(

const std::string& filename, const std::string& extension)

{

std::string file_extension_if_present =

filename.substr(filename.find_last_of(".") + 1);

if (file_extension_if_present == extension)

return true;

return false;

}

void Plot::set_output_path(pugi::xml_node plot_node)

{

// Set output file path

std::string filename;

if (check_for_node(plot_node, "filename")) {

filename = get_node_value(plot_node, "filename");

} else {

filename = fmt::format("plot_{}", id());

}

const std::string dir_if_present =

filename.substr(0, filename.find_last_of("/") + 1);

if (dir_if_present.size() > 0 && !dir_exists(dir_if_present)) {

fatal_error(fmt::format("Directory '{}' does not exist!", dir_if_present));

}

// add appropriate file extension to name

switch (type_) {

case PlotType::slice:

#ifdef USE_LIBPNG

if (!file_extension_present(filename, "png"))

filename.append(".png");

#else

if (!file_extension_present(filename, "ppm"))

filename.append(".ppm");

#endif

break;

case PlotType::voxel:

if (!file_extension_present(filename, "h5"))

filename.append(".h5");

break;

}

path_plot_ = filename;

// Copy plot pixel size

vector<int> pxls = get_node_array<int>(plot_node, "pixels");

if (PlotType::slice == type_) {

if (pxls.size() == 2) {

pixels()[0] = pxls[0];

pixels()[1] = pxls[1];

} else {

fatal_error(

fmt::format("<pixels> must be length 2 in slice plot {}", id()));

}

} else if (PlotType::voxel == type_) {

if (pxls.size() == 3) {

pixels()[0] = pxls[0];

pixels()[1] = pxls[1];

pixels()[2] = pxls[2];

} else {

fatal_error(

fmt::format("<pixels> must be length 3 in voxel plot {}", id()));

}

}

}

void PlottableInterface::set_bg_color(pugi::xml_node plot_node)

{

// Copy plot background color

if (check_for_node(plot_node, "background")) {

vector<int> bg_rgb = get_node_array<int>(plot_node, "background");

if (bg_rgb.size() == 3) {

not_found_ = bg_rgb;

} else {

fatal_error(fmt::format("Bad background RGB in plot {}", id()));

}

}

}

void Plot::set_basis(pugi::xml_node plot_node)

{

// Copy plot basis

if (PlotType::slice == type_) {

std::string pl_basis = "xy";

if (check_for_node(plot_node, "basis")) {

pl_basis = get_node_value(plot_node, "basis", true);

}

if ("xy" == pl_basis) {

basis_ = PlotBasis::xy;

} else if ("xz" == pl_basis) {

basis_ = PlotBasis::xz;

} else if ("yz" == pl_basis) {

basis_ = PlotBasis::yz;

} else {

fatal_error(

fmt::format("Unsupported plot basis '{}' in plot {}", pl_basis, id()));

}

}

}

void Plot::set_origin(pugi::xml_node plot_node)

{

// Copy plotting origin

auto pl_origin = get_node_array<double>(plot_node, "origin");

if (pl_origin.size() == 3) {

origin_ = pl_origin;

} else {

fatal_error(fmt::format("Origin must be length 3 in plot {}", id()));

}

}

void Plot::set_width(pugi::xml_node plot_node)

{

// Copy plotting width

vector<double> pl_width = get_node_array<double>(plot_node, "width");

if (PlotType::slice == type_) {

if (pl_width.size() == 2) {

width_.x = pl_width[0];

width_.y = pl_width[1];

switch (basis_) {

case PlotBasis::xy:

u_span_ = {width_.x, 0.0, 0.0};

v_span_ = {0.0, width_.y, 0.0};

break;

case PlotBasis::xz:

u_span_ = {width_.x, 0.0, 0.0};

v_span_ = {0.0, 0.0, width_.y};

break;

case PlotBasis::yz:

u_span_ = {0.0, width_.x, 0.0};

v_span_ = {0.0, 0.0, width_.y};

break;

default:

UNREACHABLE();

}

} else {

fatal_error(

fmt::format("<width> must be length 2 in slice plot {}", id()));

}

} else if (PlotType::voxel == type_) {

if (pl_width.size() == 3) {

pl_width = get_node_array<double>(plot_node, "width");

width_ = pl_width;

} else {

fatal_error(

fmt::format("<width> must be length 3 in voxel plot {}", id()));

}

}

}

void PlottableInterface::set_universe(pugi::xml_node plot_node)

{

// Copy plot universe level

if (check_for_node(plot_node, "level")) {

level_ = std::stoi(get_node_value(plot_node, "level"));

if (level_ < 0) {

fatal_error(fmt::format("Bad universe level in plot {}", id()));

}

} else {

level_ = PLOT_LEVEL_LOWEST;

}

}

void PlottableInterface::set_color_by(pugi::xml_node plot_node)

{

// Copy plot color type

std::string pl_color_by = "cell";

if (check_for_node(plot_node, "color_by")) {

pl_color_by = get_node_value(plot_node, "color_by", true);

}

if ("cell" == pl_color_by) {

color_by_ = PlotColorBy::cells;

} else if ("material" == pl_color_by) {

color_by_ = PlotColorBy::mats;

} else {

fatal_error(fmt::format(

"Unsupported plot color type '{}' in plot {}", pl_color_by, id()));

}

}

void PlottableInterface::set_default_colors()

{

// Copy plot color type and initialize all colors randomly

if (PlotColorBy::cells == color_by_) {

colors_.resize(model::cells.size());

} else if (PlotColorBy::mats == color_by_) {

colors_.resize(model::materials.size());

}

for (auto& c : colors_) {

c = random_color();

// make sure we don't interfere with some default colors

while (c == RED || c == WHITE) {

c = random_color();

}

}

}

void PlottableInterface::set_user_colors(pugi::xml_node plot_node)

{

for (auto cn : plot_node.children("color")) {

// Make sure 3 values are specified for RGB

vector<int> user_rgb = get_node_array<int>(cn, "rgb");

if (user_rgb.size() != 3) {

fatal_error(fmt::format("Bad RGB in plot {}", id()));

}

// Ensure that there is an id for this color specification

int col_id;

if (check_for_node(cn, "id")) {

col_id = std::stoi(get_node_value(cn, "id"));

} else {

fatal_error(fmt::format(

"Must specify id for color specification in plot {}", id()));

}

// Add RGB

if (PlotColorBy::cells == color_by_) {

if (model::cell_map.find(col_id) != model::cell_map.end()) {

col_id = model::cell_map[col_id];

colors_[col_id] = user_rgb;

} else {

warning(fmt::format(

"Could not find cell {} specified in plot {}", col_id, id()));

}

} else if (PlotColorBy::mats == color_by_) {

if (model::material_map.find(col_id) != model::material_map.end()) {

col_id = model::material_map[col_id];

colors_[col_id] = user_rgb;

} else {

warning(fmt::format(

"Could not find material {} specified in plot {}", col_id, id()));

}

}

} // color node loop

}

void Plot::set_meshlines(pugi::xml_node plot_node)

{

// Deal with meshlines

pugi::xpath_node_set mesh_line_nodes = plot_node.select_nodes("meshlines");

if (!mesh_line_nodes.empty()) {

if (PlotType::voxel == type_) {

warning(fmt::format("Meshlines ignored in voxel plot {}", id()));

}

if (mesh_line_nodes.size() == 1) {

// Get first meshline node

pugi::xml_node meshlines_node = mesh_line_nodes[0].node();

// Check mesh type

std::string meshtype;

if (check_for_node(meshlines_node, "meshtype")) {

meshtype = get_node_value(meshlines_node, "meshtype");

} else {

fatal_error(fmt::format(

"Must specify a meshtype for meshlines specification in plot {}",

id()));

}

// Ensure that there is a linewidth for this meshlines specification

std::string meshline_width;

if (check_for_node(meshlines_node, "linewidth")) {

meshline_width = get_node_value(meshlines_node, "linewidth");

meshlines_width_ = std::stoi(meshline_width);

} else {

fatal_error(fmt::format(

"Must specify a linewidth for meshlines specification in plot {}",

id()));

}

// Check for color

if (check_for_node(meshlines_node, "color")) {

// Check and make sure 3 values are specified for RGB

vector<int> ml_rgb = get_node_array<int>(meshlines_node, "color");

if (ml_rgb.size() != 3) {

fatal_error(

fmt::format("Bad RGB for meshlines color in plot {}", id()));

}

meshlines_color_ = ml_rgb;

}

// Set mesh based on type

if ("ufs" == meshtype) {

if (!simulation::ufs_mesh) {

fatal_error(

fmt::format("No UFS mesh for meshlines on plot {}", id()));

} else {

for (int i = 0; i < model::meshes.size(); ++i) {

if (const auto* m =

dynamic_cast<const RegularMesh*>(model::meshes[i].get())) {

if (m == simulation::ufs_mesh) {

index_meshlines_mesh_ = i;

}

}

}

if (index_meshlines_mesh_ == -1)

fatal_error("Could not find the UFS mesh for meshlines plot");

}

} else if ("entropy" == meshtype) {

if (!simulation::entropy_mesh) {

fatal_error(

fmt::format("No entropy mesh for meshlines on plot {}", id()));

} else {

for (int i = 0; i < model::meshes.size(); ++i) {

if (const auto* m =

dynamic_cast<const RegularMesh*>(model::meshes[i].get())) {

if (m == simulation::entropy_mesh) {

index_meshlines_mesh_ = i;

}

}

}

if (index_meshlines_mesh_ == -1)

fatal_error("Could not find the entropy mesh for meshlines plot");

}

} else if ("tally" == meshtype) {

// Ensure that there is a mesh id if the type is tally

int tally_mesh_id;

if (check_for_node(meshlines_node, "id")) {

tally_mesh_id = std::stoi(get_node_value(meshlines_node, "id"));

} else {

std::stringstream err_msg;

fatal_error(fmt::format("Must specify a mesh id for meshlines tally "

"mesh specification in plot {}",

id()));

}

// find the tally index

int idx;

int err = openmc_get_mesh_index(tally_mesh_id, &idx);

if (err != 0) {

fatal_error(fmt::format("Could not find mesh {} specified in "

"meshlines for plot {}",

tally_mesh_id, id()));

}

index_meshlines_mesh_ = idx;

} else {

fatal_error(fmt::format("Invalid type for meshlines on plot {}", id()));

}

} else {

fatal_error(fmt::format("Mutliple meshlines specified in plot {}", id()));

}

}

}

void PlottableInterface::set_mask(pugi::xml_node plot_node)

{

// Deal with masks

pugi::xpath_node_set mask_nodes = plot_node.select_nodes("mask");

if (!mask_nodes.empty()) {

if (mask_nodes.size() == 1) {

// Get pointer to mask

pugi::xml_node mask_node = mask_nodes[0].node();

// Determine how many components there are and allocate

vector<int> iarray = get_node_array<int>(mask_node, "components");

if (iarray.size() == 0) {

fatal_error(

fmt::format("Missing <components> in mask of plot {}", id()));

}

// First we need to change the user-specified identifiers to indices

// in the cell and material arrays

for (auto& col_id : iarray) {

if (PlotColorBy::cells == color_by_) {

if (model::cell_map.find(col_id) != model::cell_map.end()) {

col_id = model::cell_map[col_id];

} else {

fatal_error(fmt::format("Could not find cell {} specified in the "

"mask in plot {}",

col_id, id()));

}

} else if (PlotColorBy::mats == color_by_) {

if (model::material_map.find(col_id) != model::material_map.end()) {

col_id = model::material_map[col_id];

} else {

fatal_error(fmt::format("Could not find material {} specified in "

"the mask in plot {}",

col_id, id()));

}

}

}

// Alter colors based on mask information

for (int j = 0; j < colors_.size(); j++) {

if (contains(iarray, j)) {

if (check_for_node(mask_node, "background")) {

vector<int> bg_rgb = get_node_array<int>(mask_node, "background");

colors_[j] = bg_rgb;

} else {

colors_[j] = WHITE;

}

}

}

} else {

fatal_error(fmt::format("Mutliple masks specified in plot {}", id()));

}

}

}

void PlottableInterface::set_overlap_color(pugi::xml_node plot_node)

{

color_overlaps_ = false;

if (check_for_node(plot_node, "show_overlaps")) {

color_overlaps_ = get_node_value_bool(plot_node, "show_overlaps");

// check for custom overlap color

if (check_for_node(plot_node, "overlap_color")) {

if (!color_overlaps_) {

warning(fmt::format(

"Overlap color specified in plot {} but overlaps won't be shown.",

id()));

}

vector<int> olap_clr = get_node_array<int>(plot_node, "overlap_color");

if (olap_clr.size() == 3) {

overlap_color_ = olap_clr;

} else {

fatal_error(fmt::format("Bad overlap RGB in plot {}", id()));

}

}

}

// make sure we allocate the vector for counting overlap checks if

// they're going to be plotted

if (color_overlaps_ && settings::run_mode == RunMode::PLOTTING) {

settings::check_overlaps = true;

model::overlap_check_count.resize(model::cells.size(), 0);

}

}

PlottableInterface::PlottableInterface(pugi::xml_node plot_node)

{

set_id(plot_node);

set_bg_color(plot_node);

set_universe(plot_node);

set_color_by(plot_node);

set_default_colors();

set_user_colors(plot_node);

set_mask(plot_node);

set_overlap_color(plot_node);

}

Plot::Plot(pugi::xml_node plot_node, PlotType type)

: PlottableInterface(plot_node), type_(type), index_meshlines_mesh_ {-1}

{

set_output_path(plot_node);

set_basis(plot_node);

set_origin(plot_node);

set_width(plot_node);

set_meshlines(plot_node);

slice_level_ = level_; // Copy level employed in SlicePlotBase::get_map

show_overlaps_ = color_overlaps_;

}

//==============================================================================

// OUTPUT_PPM writes out a previously generated image to a PPM file

//==============================================================================

void output_ppm(const std::string& filename, const ImageData& data)

{

// Open PPM file for writing

std::string fname = filename;

fname = strtrim(fname);

std::ofstream of;

of.open(fname);

// Write header

of << "P6\n";

of << data.shape(0) << " " << data.shape(1) << "\n";

of << "255\n";

of.close();

of.open(fname, std::ios::binary | std::ios::app);

// Write color for each pixel

for (int y = 0; y < data.shape(1); y++) {

for (int x = 0; x < data.shape(0); x++) {

RGBColor rgb = data(x, y);

of << rgb.red << rgb.green << rgb.blue;

}

}

of << "\n";

}

//==============================================================================

// OUTPUT_PNG writes out a previously generated image to a PNG file

//==============================================================================

#ifdef USE_LIBPNG

void output_png(const std::string& filename, const ImageData& data)

{

// Open PNG file for writing

std::string fname = filename;

fname = strtrim(fname);

auto fp = std::fopen(fname.c_str(), "wb");

// Initialize write and info structures

auto png_ptr =

png_create_write_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);

auto info_ptr = png_create_info_struct(png_ptr);

// Setup exception handling

if (setjmp(png_jmpbuf(png_ptr)))

fatal_error("Error during png creation");

png_init_io(png_ptr, fp);

// Write header (8 bit colour depth)

int width = data.shape(0);

int height = data.shape(1);

png_set_IHDR(png_ptr, info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB,

PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);

png_write_info(png_ptr, info_ptr);

// Allocate memory for one row (3 bytes per pixel - RGB)

std::vector<png_byte> row(3 * width);

// Write color for each pixel

for (int y = 0; y < height; y++) {

for (int x = 0; x < width; x++) {

RGBColor rgb = data(x, y);

row[3 * x] = rgb.red;

row[3 * x + 1] = rgb.green;

row[3 * x + 2] = rgb.blue;

}

png_write_row(png_ptr, row.data());

}

// End write

png_write_end(png_ptr, nullptr);

// Clean up data structures

std::fclose(fp);

png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);

png_destroy_write_struct(&png_ptr, &info_ptr);

}

#endif

//==============================================================================

// DRAW_MESH_LINES draws mesh line boundaries on an image

//==============================================================================

void Plot::draw_mesh_lines(ImageData& data) const

{

RGBColor rgb;

rgb = meshlines_color_;

int ax1, ax2;

Position expected_u {};

Position expected_v {};

switch (basis_) {

case PlotBasis::xy:

ax1 = 0;

ax2 = 1;

expected_u = {width_[0], 0.0, 0.0};

expected_v = {0.0, width_[1], 0.0};

break;

case PlotBasis::xz:

ax1 = 0;

ax2 = 2;

expected_u = {width_[0], 0.0, 0.0};

expected_v = {0.0, 0.0, width_[1]};

break;

case PlotBasis::yz:

ax1 = 1;

ax2 = 2;

expected_u = {0.0, width_[0], 0.0};

expected_v = {0.0, 0.0, width_[1]};

break;

default:

UNREACHABLE();

}

// Meshlines rely on axis-aligned indexing in global coordinates.

constexpr double rel_tol {1e-12};

double span_tol = rel_tol * (1.0 + u_span_.norm() + v_span_.norm());

if ((u_span_ - expected_u).norm() > span_tol ||

(v_span_ - expected_v).norm() > span_tol) {

fatal_error("Meshlines are only supported for axis-aligned slice plots.");

}

Position ll_plot {origin_};

Position ur_plot {origin_};

ll_plot[ax1] -= width_[0] / 2.;

ll_plot[ax2] -= width_[1] / 2.;

ur_plot[ax1] += width_[0] / 2.;

ur_plot[ax2] += width_[1] / 2.;

Position width = ur_plot - ll_plot;

// Find the (axis-aligned) lines of the mesh that intersect this plot.

auto axis_lines =

model::meshes[index_meshlines_mesh_]->plot(ll_plot, ur_plot);

// Find the bounds along the second axis (accounting for low-D meshes).

int ax2_min, ax2_max;

if (axis_lines.second.size() > 0) {

double frac = (axis_lines.second.back() - ll_plot[ax2]) / width[ax2];

ax2_min = (1.0 - frac) * pixels()[1];

if (ax2_min < 0)

ax2_min = 0;

frac = (axis_lines.second.front() - ll_plot[ax2]) / width[ax2];