Function VHRotateV

src/openboardview/vectorhulls.cpp:12–25

#include "vectorhulls.h"

void VHRotateV(double *px, double *py, double ox, double oy, double theta) {
	double tx, ty, ttx, tty;

	tx = *px - ox;
	ty = *py - oy;

	// With not a lot of parts on the boards, we can get away with using the
	// precision trig functions, might have to change to LUT based later.
	ttx = tx * cos(theta) - ty * sin(theta);
	tty = tx * sin(theta) + ty * cos(theta);

	*px = ttx + ox;
	*py = tty + oy;
}

ImVec2 VHRotateV(ImVec2 v, ImVec2 o, double theta) {
	double tx, ty, ttx, tty;