yggdrasil75/stupidsimcpp
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some g2 changes.

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Yggdrasil75
2026-02-20 13:20:53 -05:00
parent 4f227df1d7
commit 2768b6849e
1 changed files with 11 additions and 45 deletions
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56
util/grid/grid2.hpp
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@@ -27,42 +27,24 @@ constexpr int Dim2 = 2;
template<typename T>
class Grid2 {
public:
using PointType = Eigen::Matrix<float, Dim2, 1>; // Eigen::Vector2f
using PointType = Eigen::Matrix<float, Dim2, 1>;
using BoundingBox = std::pair<PointType, PointType>;
// Shape for 2D is usually a Circle or a Square (AABB)
enum class Shape {
CIRCLE,
SQUARE
};
struct NodeData {
T data;
PointType position;
int objectId;
bool active;
bool visible;
float size; // Radius or half-width
Eigen::Vector4f color; // RGBA
// Physics properties
float temperature;
float conductivity;
float specific_heat;
float density;
float next_temperature; // For double-buffering simulation
Shape shape;
float size;
Eigen::Vector4f color;
NodeData(const T& data, const PointType& pos, bool visible, Eigen::Vector4f color, float size = 1.0f,
bool active = true, int objectId = -1, Shape shape = Shape::SQUARE)
: data(data), position(pos), objectId(objectId), active(active), visible(visible),
color(color), size(size), shape(shape),
temperature(0.0f), conductivity(1.0f), specific_heat(1.0f), density(1.0f), next_temperature(0.0f) {}
color(color), size(size) {}
NodeData() : objectId(-1), active(false), visible(false), size(0.0f),
color(0,0,0,0), shape(Shape::SQUARE),
temperature(0.0f), conductivity(1.0f), specific_heat(1.0f), density(1.0f), next_temperature(0.0f) {}
NodeData() : objectId(-1), active(false), visible(false), size(0.0f), color(0,0,0,0) {}
// Helper for Square bounds
BoundingBox getSquareBounds() const {
@@ -74,7 +56,7 @@ public:
struct QuadNode {
BoundingBox bounds;
std::vector<std::shared_ptr<NodeData>> points;
std::array<std::unique_ptr<QuadNode>, 4> children; // 4 quadrants
std::array<std::unique_ptr<QuadNode>, 4> children;
PointType center;
bool isLeaf;
@@ -106,35 +88,19 @@ private:
Eigen::Vector4f backgroundColor_ = {0.0f, 0.0f, 0.0f, 0.0f};
PNoise2 noisegen;
// Determine quadrant: 0:SW, 1:SE, 2:NW, 3:NE
uint8_t getQuadrant(const PointType& point, const PointType& center) const {
uint8_t quad = 0;
if (point.x() >= center.x()) quad |= 1; // Right
if (point.y() >= center.y()) quad |= 2; // Top
return quad;
return (point.x() >= center.x()) | ((point.y() >= center.y()) << 1);
}
BoundingBox createChildBounds(const QuadNode* node, uint8_t quad) const {
PointType childMin, childMax;
PointType center = node->center;
// X axis
if (quad & 1) { // Right
childMin.x() = center.x();
childMax.x() = node->bounds.second.x();
} else { // Left
childMin.x() = node->bounds.first.x();
childMax.x() = center.x();
}
childMin[0] = (quad & 1) ? center[0] : node->bounds.first[0];
childMax[0] = (quad & 1) ? node->bounds.second[0] : center[0];
// Y axis
if (quad & 2) { // Top
childMin.y() = center.y();
childMax.y() = node->bounds.second.y();
} else { // Bottom
childMin.y() = node->bounds.first.y();
childMax.y() = center.y();
}
childMin[1] = (quad & 2) ? center[1] : node->bounds.first[1];
childMax[1] = (quad & 2) ? node->bounds.second[1] : center[1];
return {childMin, childMax};
}