| 105 | } |
| 106 | |
| 107 | std::string network::data_string() { |
| 108 | std::stringstream ss; |
| 109 | ss.precision(10); |
| 110 | ss << std::fixed; |
| 111 | bool plot_z_data = z_data_.size() == x_data_.size(); |
| 112 | bool line_width_is_variable = !line_widths_.empty() && z_data_.empty(); |
| 113 | // plot edges |
| 114 | if (!directed_) { |
| 115 | // when not directed, each edge is a line |
| 116 | for (size_t i = 0; i < edges_.size(); ++i) { |
| 117 | ss << " " << x_data_[edges_[i].first]; |
| 118 | if (!line_width_is_variable) { |
| 119 | ss << " " << y_data_[edges_[i].first]; |
| 120 | } else { |
| 121 | ss << " " |
| 122 | << y_data_[edges_[i].first] - line_widths_[i] / 2.; |
| 123 | ss << " " |
| 124 | << y_data_[edges_[i].first] + line_widths_[i] / 2.; |
| 125 | } |
| 126 | if (plot_z_data) { |
| 127 | ss << " " << z_data_[edges_[i].first]; |
| 128 | } |
| 129 | ss << "\n"; |
| 130 | ss << " " << x_data_[edges_[i].second]; |
| 131 | if (!line_width_is_variable) { |
| 132 | ss << " " << y_data_[edges_[i].second]; |
| 133 | } else { |
| 134 | ss << " " |
| 135 | << y_data_[edges_[i].second] - line_widths_[i] / 2.; |
| 136 | ss << " " |
| 137 | << y_data_[edges_[i].second] + line_widths_[i] / 2.; |
| 138 | } |
| 139 | if (plot_z_data) { |
| 140 | ss << " " << z_data_[edges_[i].second]; |
| 141 | } |
| 142 | ss << "\n\n"; |
| 143 | } |
| 144 | ss << "e\n"; |
| 145 | } else { |
| 146 | // when directed, each edge is a vector |
| 147 | // for each edge, plot two vectors |
| 148 | // - one from start to middle |
| 149 | // - one from middle to end |
| 150 | for (size_t i = 0; i < edges_.size(); ++i) { |
| 151 | double x1 = x_data_[edges_[i].first]; |
| 152 | double y1 = y_data_[edges_[i].first]; |
| 153 | double x2 = x_data_[edges_[i].second]; |
| 154 | double y2 = y_data_[edges_[i].second]; |
| 155 | double xmean = 0.5 * (x1 + x2); |
| 156 | double ymean = 0.5 * (y1 + y2); |
| 157 | double u1 = xmean - x1; |
| 158 | double v1 = ymean - y1; |
| 159 | double u2 = x2 - xmean; |
| 160 | double v2 = y2 - ymean; |
| 161 | if (!plot_z_data) { |
| 162 | ss << " " << x1 << " " << y1 << " " << u1 << " " << v1 |
| 163 | << "\n"; |
| 164 | ss << " " << xmean << " " << ymean << " " << u2 << " " |