#include "Line.h"

Line::Line(double x1, double y1, double x2, double y2) : x1(x1), y1(y1), x2(x2), y2(y2) {}

Vector2 Line::nextVector(double drawingProgress) {
	return Vector2(
		x1 + (x2 - x1) * drawingProgress,
		y1 + (y2 - y1) * drawingProgress
	);
}

void Line::rotate(double theta) {
	double cosTheta = std::cos(theta);
	double sinTheta = std::sin(theta);

	double newX1 = x1 * cosTheta - y1 * sinTheta;
	double newY1 = x1 * sinTheta + y1 * cosTheta;
	double newX2 = x2 * cosTheta - y2 * sinTheta;
	double newY2 = x2 * sinTheta + y2 * cosTheta;

	x1 = newX1;
	y1 = newY1;
	x2 = newX2;
	y2 = newY2;
}

void Line::scale(double x, double y) {
	x1 *= x;
	y1 *= y;
	x2 *= x;
	y2 *= y;
}

void Line::translate(double x, double y) {
	x1 += x;
	y1 += y;
	x2 += x;
	y2 += y;
}

double Line::length() {
	if (len < 0) {
		// Euclidean distance approximation based on octagonal boundary
		double dx = std::abs(x2 - x1);
		double dy = std::abs(y2 - y1);

		len = 0.41 * std::min(dx, dy) + 0.941246 * std::max(dx, dy);
	}
	return len;
}