ultimatepp/uppdev/ScanLine/Dasher.cpp

#include "ScanLine.h"

void Dasher::Put(const Pointf& p)
{
	if(flag)
		PutLine(p);
	else
		PutMove(p);
}

void Dasher::Move(const Pointf& p)
{
	PutMove(p);
	p0 = p;
}

void Dasher::Line(const Pointf& p)
{
	if(pattern.GetCount() == 0) {
		PutLine(p);
		return;
	}
	Pointf v = p - p0;
	double len = Length(v);
	double pos = 0;
	while(pos + rem < len) {
		pos += rem;
		Put(pos / len * v + p0);
		flag = !flag;
		rem = pattern[patterni];
		patterni = (patterni + 1) % pattern.GetCount();
	}
	rem -= len - pos;
	Put(p);
	p0 = p;
}

Dasher::Dasher(double width, const Vector<double>& p, double distance)
{
	pattern.SetCount(p.GetCount());
	double sum = 0;
	for(int i = 0; i < p.GetCount(); i++)
		sum += (pattern[i] = p[i] * width);
	if(sum == 0) {
		pattern.Clear();
		return;
	}
	distance -= int(distance / sum) * sum;
	patterni = 0;
	flag = false;
	for(;;) {
		rem = pattern[patterni];
		patterni = (patterni + 1) % pattern.GetCount();
		flag = !flag;
		if(rem > distance) {
			rem -= distance;
			break;
		}
		distance -= rem;
	}
	p0 = Pointf(0, 0);
}