line.java

日本人写的QRcode的编码和解码的java程序

/*
 * 嶌惉擔丗 2004/09/13
 *
 * TODO 偙偺惗惉偝傟偨僼傽僀儖偺僥儞僾儗乕僩傪曄峏偡傞偵偼師傪嶲徠丅
 * 僂傿儞僪僂 亜 愝掕 亜 Java 亜 僐乕僪丒僗僞僀儖 亜 僐乕僪丒僥儞僾儗乕僩
 */
package jp.sourceforge.qrcode.codec.geom;

import jp.sourceforge.qrcode.codec.util.QRCodeUtility;


/**
 * @author Owner
 *
 * TODO 偙偺惗惉偝傟偨宆僐儊儞僩偺僥儞僾儗乕僩傪曄峏偡傞偵偼師傪嶲徠丅
 * 僂傿儞僪僂 亜 愝掕 亜 Java 亜 僐乕僪丒僗僞僀儖 亜 僐乕僪丒僥儞僾儗乕僩
 */
public class Line{
	int x1, y1, x2, y2;
	
	public Line() {
		x1 = y1 = x2 = y2 = 0;
	}
	public Line(int x1, int y1, int x2, int y2) {
		this.x1 = x1;
		this.y1 = y1;
		this.x2 = x2;
		this.y2 = y2;
	}
	public Line(Point p1, Point p2) {
		x1 = p1.getX();
		y1 = p1.getY();
		x2 = p2.getX();
		y2 = p2.getY();
	}
	public Point getP1() {
		return new Point(x1, y1);
	}
	
	public Point getP2() {
		return new Point(x2, y2);
	}
	
	public void setLine(int x1, int y1, int x2, int y2) {
		this.x1 = x1;
		this.y1 = y1;
		this.x2 = x2;
		this.y2 = y2;
	}
	public void setP1(Point p1) {
		x1 = p1.getX();
		y1 = p1.getY();
	}
	public void setP1(int x1, int y1) {
		this.x1 = x1;
		this.y1 = y1;
	}
	public void setP2(Point p2) {
		x2 = p2.getX();
		y2 = p2.getY();
	}
	public void setP2(int x2, int y2) {
		this.x2 = x2;
		this.y2 = y2;
	}
	
	public void translate(int dx, int dy) {
		this.x1 += dx;
		this.y1 += dy;
		this.x2 += dx;
		this.y2 += dy;
	}
	
	//Line摨巑偑椬傝崌偭偰偄傞偐(悈暯曽岦偺偢傟偼椉抂偦傟偧傟1僪僢僩傑偱擣傔傞)
	public static boolean isNeighbor(Line line1, Line line2) {
		if ((Math.abs(line1.getP1().getX() - line2.getP1().getX()) < 2 &&
				Math.abs(line1.getP1().getY() - line2.getP1().getY()) < 2) &&
				(Math.abs(line1.getP2().getX() - line2.getP2().getX()) < 2 &&
				Math.abs(line1.getP2().getY() - line2.getP2().getY()) < 2))
			return true;
		else
			return false;
	}


	
	public boolean isHorizontal() {
		if (y1 == y2)
			return true;
		else
			return false;
	}
	
	public boolean isVertical() {
		if (x1 == x2)
			return true;
		else
			return false;
	}
	
	//暯峴傑偨偼悅捈偱偐偮丄廔揰偺XY嵗昗偑巒揰偺XY嵗昗傛傝偦傟偧傟戝偒偄慄暘偺傒敾掕壜擻
	public static boolean isCross(Line line1, Line line2) {
		if (line1.isHorizontal() && line2.isVertical()) {
			if (line1.getP1().getY() > line2.getP1().getY() &&
					line1.getP1().getY() < line2.getP2().getY() &&
					line2.getP1().getX() > line1.getP1().getX() &&
					line2.getP1().getX() < line1.getP2().getX())
				return true;
		} else if (line1.isVertical() && line2.isHorizontal()) {
			if (line1.getP1().getX() > line2.getP1().getX() &&
					line1.getP1().getX() < line2.getP2().getX() &&
					line2.getP1().getY() > line1.getP1().getY() &&
					line2.getP1().getY() < line1.getP2().getY())
				return true;
		}
		
		return false;
	}
	
	public Point getCenter() {
		int x = (x1 + x2) / 2;
		int y = (y1 + y2) / 2;
		return new Point(x , y);
	}
	public int getLength() {
		int x = Math.abs(x2 - x1);
		int y = Math.abs(y2 - y1);
		int r = QRCodeUtility.sqrt(x * x + y * y);
		return r;
	}
	public static Line getLongest(Line[] lines) {
		Line longestLine = new Line();
		for (int i = 0; i < lines.length; i++) {
			if (lines[i].getLength() > longestLine.getLength()) {
				longestLine = lines[i];
			}
		}
		return longestLine;
	}
	public String toString() {
		return "(" + Integer.toString(x1) + "," + Integer.toString(y1) + ")-(" +
			Integer.toString(x2) + "," + Integer.toString(y2) + ")";
	}
}