69 lines
2.4 KiB
C++
69 lines
2.4 KiB
C++
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#include "layout.hpp"
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#include "algebra.hpp"
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#include <cmath>
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#include <limits>
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namespace nodesoup {
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using std::vector;
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void circle(const adj_list_t& g, vector<Point2D>& positions) {
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const double pi = 3.14159265358979323846;
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double angle = 2.0 * pi / g.size();
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for (vertex_id_t v_id = 0; v_id < g.size(); v_id++) {
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positions[v_id].x = cos(v_id * angle);
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positions[v_id].y = sin(v_id * angle);
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}
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}
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void center_and_scale(const adj_list_t& g, unsigned int width, unsigned int height, vector<Point2D>& positions) {
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// find current dimensions
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double x_min = std::numeric_limits<double>::max();
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double x_max = std::numeric_limits<double>::lowest();
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double y_min = std::numeric_limits<double>::max();
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double y_max = std::numeric_limits<double>::lowest();
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for (vertex_id_t v_id = 0; v_id < g.size(); v_id++) {
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if (positions[v_id].x < x_min)
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x_min = positions[v_id].x;
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if (positions[v_id].x > x_max)
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x_max = positions[v_id].x;
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if (positions[v_id].y < y_min)
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y_min = positions[v_id].y;
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if (positions[v_id].y > y_max)
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y_max = positions[v_id].y;
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}
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double cur_width = x_max - x_min;
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double cur_height = y_max - y_min;
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// compute scale factor (0.9: keep some margin)
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double x_scale = (cur_width > 0) ? width / cur_width : width;
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double y_scale = (cur_height > 0) ? height / cur_height : height;
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Vector2D scale = { x_scale, y_scale };
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// compute offset and apply it to every position
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Vector2D center = { x_max + x_min, y_max + y_min };
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Vector2D offset = (center / 2.0) * scale;
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double shiftMinX = std::numeric_limits<double>::max();
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double shiftMinY = std::numeric_limits<double>::max();
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for (vertex_id_t v_id = 0; v_id < g.size(); v_id++)
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{
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positions[v_id] = (Point2D)((Vector2D)positions[v_id] * scale - offset);
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shiftMinX = std::min(shiftMinX, positions[v_id].x);
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shiftMinY = std::min(shiftMinY, positions[v_id].y);
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}
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shiftMinX = abs(shiftMinX) + 50;
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shiftMinY = abs(shiftMinY) + 50;
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for (auto& pos : positions)
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{
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pos.x += shiftMinX;
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pos.y += shiftMinY;
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}
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}
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}
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