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/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

package org.fernice.reflare.util

import java.awt.Graphics
import kotlin.math.abs
import kotlin.math.min

internal fun Graphics.drawAALine(x1: Int, y1: Int, x2: Int, y2: Int) {
    assert(x1 == x2 || y1 == y2)
    if (y1 == y2) {
        val x = min(x1, x2)
        val width = abs(x2 - x1) + 1
        fillRect(x, y1, width, 1)
    } else if (x1 == x2) {
        val y = min(y1, y2)
        val height = abs(y2 - y1) + 1
        fillRect(x1, y, 1, height)
    } else {
        error("non axis-aligned line: ${x1}x${y1} to ${x2}x${y2}")
    }
}