sweepline_test.go

// Copyright (c) 2011 Mateusz Czapliński
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

package polyclip

import (
	. "testing"
)

func TestVerticalZigzag(t *T) {
	mkseg := func(xl, yl, xr, yr float64) (left *endpoint) {
		left = &endpoint{p: Point{xl, yl}, left: true, polygonType: _SUBJECT}
		right := &endpoint{p: Point{xr, yr}, polygonType: _SUBJECT, other: left}
		left.other = right
		return left
	}

	seq := []*endpoint{
		mkseg(1, 0, 3, 1),
		mkseg(1, 2, 3, 1),
		mkseg(1, 2, 3, 3),
		mkseg(1, 4, 3, 3),
	}

	line := &sweepline{}
	for i := 0; i < len(seq); i++ {
		line.insert(seq[i])
		for j := 0; j < len(*line); j++ {
			verify(t, (*line)[j] == seq[j], "Inserting seq[%d], expected line[%d]==%v, got %v", i, j, seq[j], (*line)[j])
		}
	}
}