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#include <stdexcept>
#include <type_traits>
#include "AI.h"
#include "types.h"
namespace crepe {
AI::AI(game_object_id_t id, float max_force) : Component(id), max_force(max_force) {}
void AI::make_circle_path(
float radius, const vec2 & center, float start_angle, bool clockwise
) {
if (radius <= 0) {
throw std::runtime_error("Radius must be greater than 0");
}
// The step size is determined by the radius (step size is in radians)
float step = RADIUS_TO_STEP / radius;
// Force at least MIN_STEP steps (in case of a small radius)
if (step > 2 * M_PI / MIN_STEP) {
step = 2 * M_PI / MIN_STEP;
}
// The path node distance is determined by the step size and the radius
this->path_node_distance = radius * step * PATH_NODE_DISTANCE_FACTOR;
if (clockwise) {
for (float i = start_angle; i < 2 * M_PI + start_angle; i += step) {
path.push_back(vec2 {
static_cast<float>(center.x + radius * cos(i)),
static_cast<float>(center.y + radius * sin(i))
});
}
} else {
for (float i = start_angle; i > start_angle - 2 * M_PI; i -= step) {
path.push_back(vec2 {
static_cast<float>(center.x + radius * cos(i)),
static_cast<float>(center.y + radius * sin(i))
});
}
}
}
void AI::make_oval_path(
float radius_x, float radius_y, const vec2 & center, float start_angle, bool clockwise,
float rotation
) {
if (radius_x <= 0 && radius_y <= 0) {
throw std::runtime_error("Radius must be greater than 0");
}
float max_radius = std::max(radius_x, radius_y);
// The step size is determined by the radius (step size is in radians)
float step = RADIUS_TO_STEP / max_radius;
// Force at least MIN_STEP steps (in case of a small radius)
if (step > 2 * M_PI / MIN_STEP) {
step = 2 * M_PI / MIN_STEP;
}
// The path node distance is determined by the step size and the radius
this->path_node_distance = max_radius * step * PATH_NODE_DISTANCE_FACTOR;
std::function<vec2(vec2, vec2)> rotate_point = [rotation](vec2 point, vec2 center) {
float s = sin(rotation);
float c = cos(rotation);
// Translate point back to origin
point.x -= center.x;
point.y -= center.y;
// Rotate point
float xnew = point.x * c - point.y * s;
float ynew = point.x * s + point.y * c;
// Translate point back
point.x = xnew + center.x;
point.y = ynew + center.y;
return point;
};
if (clockwise) {
for (float i = start_angle; i < 2 * M_PI + start_angle; i += step) {
vec2 point
= {static_cast<float>(center.x + radius_x * cos(i)),
static_cast<float>(center.y + radius_y * sin(i))};
path.push_back(rotate_point(point, center));
}
} else {
for (float i = start_angle; i > start_angle - 2 * M_PI; i -= step) {
vec2 point
= {static_cast<float>(center.x + radius_x * cos(i)),
static_cast<float>(center.y + radius_y * sin(i))};
path.push_back(rotate_point(point, center));
}
}
}
} // namespace crepe
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