using System;
using QRCodeDecoder = ThoughtWorks.QRCode.Codec.QRCodeDecoder;
using ThoughtWorks.QRCode.Codec.Reader;
using FinderPatternNotFoundException = ThoughtWorks.QRCode.ExceptionHandler.FinderPatternNotFoundException;
using InvalidVersionInfoException = ThoughtWorks.QRCode.ExceptionHandler.InvalidVersionInfoException;
using InvalidVersionException = ThoughtWorks.QRCode.ExceptionHandler.InvalidVersionException;
using VersionInformationException = ThoughtWorks.QRCode.ExceptionHandler.VersionInformationException;
using ThoughtWorks.QRCode.Geom;
using ThoughtWorks.QRCode.Codec.Util;
namespace ThoughtWorks.QRCode.Codec.Reader.Pattern
{
public class FinderPattern
{
public const int UL = 0;
public const int UR = 1;
public const int DL = 2;
internal static readonly int[] VersionInfoBit = new int[] { 0x07C94, 0x085BC, 0x09A99, 0x0A4D3, 0x0BBF6, 0x0C762, 0x0D847, 0x0E60D, 0x0F928, 0x10B78, 0x1145D, 0x12A17, 0x13532, 0x149A6, 0x15683, 0x168C9, 0x177EC, 0x18EC4, 0x191E1, 0x1AFAB, 0x1B08E, 0x1CC1A, 0x1D33F, 0x1ED75, 0x1F250, 0x209D5, 0x216F0, 0x228BA, 0x2379F, 0x24B0B, 0x2542E, 0x26A64, 0x27541, 0x28C69 };
internal static DebugCanvas canvas;
internal Point[] center;
internal int version;
internal int[] sincos;
internal int[] width;
internal int[] moduleSize;
virtual public int Version
{
get
{
return version;
}
}
virtual public int SqrtNumModules
{
get
{
return 17 + 4 * version;
}
}
public static FinderPattern findFinderPattern(bool[][] image)
{
Line[] lineAcross = findLineAcross(image);
Line[] lineCross = findLineCross(lineAcross);
Point[] center = null;
try
{
center = getCenter(lineCross);
}
catch (FinderPatternNotFoundException e)
{
throw e;
}
int[] sincos = getAngle(center);
center = sort(center, sincos);
int[] width = getWidth(image, center, sincos);
// moduleSize for version recognition
int[] moduleSize = new int[]{(width[UL] << QRCodeImageReader.DECIMAL_POINT) / 7, (width[UR] << QRCodeImageReader.DECIMAL_POINT) / 7, (width[DL] << QRCodeImageReader.DECIMAL_POINT) / 7};
int version = calcRoughVersion(center, width);
if (version > 6)
{
try
{
version = calcExactVersion(center, sincos, moduleSize, image);
}
catch (VersionInformationException e)
{
//use rough version data
// throw e;
}
}
return new FinderPattern(center, version, sincos, width, moduleSize);
}
internal FinderPattern(Point[] center, int version, int[] sincos, int[] width, int[] moduleSize)
{
this.center = center;
this.version = version;
this.sincos = sincos;
this.width = width;
this.moduleSize = moduleSize;
}
public virtual Point[] getCenter()
{
return center;
}
public virtual Point getCenter(int position)
{
if (position >= UL && position <= DL)
return center[position];
else
return null;
}
public virtual int getWidth(int position)
{
return width[position];
}
public virtual int[] getAngle()
{
return sincos;
}
public virtual int getModuleSize()
{
return moduleSize[UL];
}
public virtual int getModuleSize(int place)
{
return moduleSize[place];
}
internal static Line[] findLineAcross(bool[][] image)
{
int READ_HORIZONTAL = 0;
int READ_VERTICAL = 1;
int imageWidth = image.Length;
int imageHeight = image[0].Length;
//int currentX = 0, currentY = 0;
Point current = new Point();
System.Collections.ArrayList lineAcross = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(10));
//buffer contains recent length of modules which has same brightness
int[] lengthBuffer = new int[5];
int bufferPointer = 0;
int direction = READ_HORIZONTAL; //start to read horizontally
bool lastElement = QRCodeImageReader.POINT_LIGHT;
while (true)
{
//check points in image
bool currentElement = image[current.X][current.Y];
if (currentElement == lastElement)
{
//target point has same brightness with last point
lengthBuffer[bufferPointer]++;
}
else
{
//target point has different brightness with last point
if (currentElement == QRCodeImageReader.POINT_LIGHT)
{
if (checkPattern(lengthBuffer, bufferPointer))
{
//detected pattern
int x1, y1, x2, y2;
if (direction == READ_HORIZONTAL)
{
//obtain X coordinates of both side of the detected horizontal pattern
x1 = current.X;
for (int j = 0; j < 5; j++)
{
x1 -= lengthBuffer[j];
}
x2 = current.X - 1; //right side is last X coordinate
y1 = y2 = current.Y;
}
else
{
x1 = x2 = current.X;
//obtain Y coordinates of both side of the detected vertical pattern
// upper side is sum of length of buffer
y1 = current.Y;
for (int j = 0; j < 5; j++)
{
y1 -= lengthBuffer[j];
}
y2 = current.Y - 1; // bottom side is last Y coordinate
}
lineAcross.Add(new Line(x1, y1, x2, y2));
}
}
bufferPointer = (bufferPointer + 1) % 5;
lengthBuffer[bufferPointer] = 1;
lastElement = !lastElement;
}
// determine if read next, change read direction or terminate this loop
if (direction == READ_HORIZONTAL)
{
if (current.X < imageWidth - 1)
{
current.translate(1, 0);
}
else if (current.Y < imageHeight - 1)
{
current.set_Renamed(0, current.Y + 1);
lengthBuffer = new int[5];
}
else
{
current.set_Renamed(0, 0); //reset target point
lengthBuffer = new int[5];
direction = READ_VERTICAL; //start to read vertically
}
}
else
{
//reading vertically
if (current.Y < imageHeight - 1)
current.translate(0, 1);
else if (current.X < imageWidth - 1)
{
current.set_Renamed(current.X + 1, 0);
lengthBuffer = new int[5];
}
else
{
break;
}
}
}
Line[] foundLines = new Line[lineAcross.Count];
for (int i = 0; i < foundLines.Length; i++)
foundLines[i] = (Line) lineAcross[i];
canvas.drawLines(foundLines, ThoughtWorks.QRCode.Codec.Util.Color_Fields.LIGHTGREEN);
return foundLines;
}
internal static bool checkPattern(int[] buffer, int pointer)
{
int[] modelRatio = new int[]{1, 1, 3, 1, 1};
int baselength = 0;
for (int i = 0; i < 5; i++)
{
baselength += buffer[i];
}
// pseudo fixed point calculation. I think it needs smarter code
baselength <<= QRCodeImageReader.DECIMAL_POINT;
baselength /= 7;
int i2;
for (i2 = 0; i2 < 5; i2++)
{
int leastlength = baselength * modelRatio[i2] - baselength / 2;
int mostlength = baselength * modelRatio[i2] + baselength / 2;
//TODO rough finder pattern detection
int targetlength = buffer[(pointer + i2 + 1) % 5] << QRCodeImageReader.DECIMAL_POINT;
if (targetlength < leastlength || targetlength > mostlength)
{
return false;
}
}
return true;
}
//obtain lines cross at the center of Finder Patterns
internal static Line[] findLineCross(Line[] lineAcross)
{
System.Collections.ArrayList crossLines = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(10));
System.Collections.ArrayList lineNeighbor = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(10));
System.Collections.ArrayList lineCandidate = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(10));
Line compareLine;
for (int i = 0; i < lineAcross.Length; i++)
lineCandidate.Add(lineAcross[i]);
for (int i = 0; i < lineCandidate.Count - 1; i++)
{
lineNeighbor.Clear();
lineNeighbor.Add(lineCandidate[i]);
for (int j = i + 1; j < lineCandidate.Count; j++)
{
if (Line.isNeighbor((Line) lineNeighbor[lineNeighbor.Count - 1], (Line) lineCandidate[j]))
{
lineNeighbor.Add(lineCandidate[j]);
compareLine = (Line) lineNeighbor[lineNeighbor.Count - 1];
if (lineNeighbor.Count * 5 > compareLine.Length && j == lineCandidate.Count - 1)
{
crossLines.Add(lineNeighbor[lineNeighbor.Count / 2]);
for (int k = 0; k < lineNeighbor.Count; k++)
lineCandidate.Remove(lineNeighbor[k]);
}
}
//terminate comparison if there are no possibility for found neighbour lines
else if (cantNeighbor((Line) lineNeighbor[lineNeighbor.Count - 1], (Line) lineCandidate[j]) || (j == lineCandidate.Count - 1))
{
compareLine = (Line) lineNeighbor[lineNeighbor.Count - 1];
/*
* determine lines across Finder Patterns when number of neighbour lines are
* bigger than 1/6 length of theirselves
*/
if (lineNeighbor.Count * 6 > compareLine.Length)
{
crossLines.Add(lineNeighbor[lineNeighbor.Count / 2]);
for (int k = 0; k < lineNeighbor.Count; k++)
{
lineCandidate.Remove(lineNeighbor[k]);
}
}
break;
}
}
}
Line[] foundLines = new Line[crossLines.Count];
for (int i = 0; i < foundLines.Length; i++)
{
foundLines[i] = (Line) crossLines[i];
}
return foundLines;
}
internal static bool cantNeighbor(Line line1, Line line2)
{
if (Line.isCross(line1, line2))
return true;
if (line1.Horizontal)
{
if (System.Math.Abs(line1.getP1().Y - line2.getP1().Y) > 1)
return true;
else
return false;
}
else
{
if (System.Math.Abs(line1.getP1().X - line2.getP1().X) > 1)
return true;
else
return false;
}
}
//obtain slope of symbol
internal static int[] getAngle(Point[] centers)
{
Line[] additionalLine = new Line[3];
for (int i = 0; i < additionalLine.Length; i++)
{
additionalLine[i] = new Line(centers[i], centers[(i + 1) % additionalLine.Length]);
}
// remoteLine - does not contain UL center
Line remoteLine = Line.getLongest(additionalLine);
Point originPoint = new Point();
for (int i = 0; i < centers.Length; i++)
{
if (!remoteLine.getP1().equals(centers[i]) && !remoteLine.getP2().equals(centers[i]))
{
originPoint = centers[i];
break;
}
}
canvas.println("originPoint is: " + originPoint);
Point remotePoint = new Point();
//with origin that the center of Left-Up Finder Pattern, determine other two patterns center.
//then calculate symbols angle
if (originPoint.Y <= remoteLine.getP1().Y & originPoint.Y <= remoteLine.getP2().Y)
if (remoteLine.getP1().X < remoteLine.getP2().X)
remotePoint = remoteLine.getP2();
else
remotePoint = remoteLine.getP1();
else if (originPoint.X >= remoteLine.getP1().X & originPoint.X >= remoteLine.getP2().X)
if (remoteLine.getP1().Y < remoteLine.getP2().Y)
remotePoint = remoteLine.getP2();
else
remotePoint = remoteLine.getP1();
else if (originPoint.Y >= remoteLine.getP1().Y & originPoint.Y >= remoteLine.getP2().Y)
if (remoteLine.getP1().X < remoteLine.getP2().X)
remotePoint = remoteLine.getP1();
else
remotePoint = remoteLine.getP2();
//1st or 4th quadrant
else if (remoteLine.getP1().Y < remoteLine.getP2().Y)
remotePoint = remoteLine.getP1();
else
remotePoint = remoteLine.getP2();
int r = new Line(originPoint, remotePoint).Length;
//canvas.println(Integer.toString(((remotePoint.getX() - originPoint.getX()) << QRCodeImageReader.DECIMAL_POINT)));
int[] angle = new int[2];
angle[0] = ((remotePoint.Y - originPoint.Y) << QRCodeImageReader.DECIMAL_POINT) / r; //Sin
angle[1] = ((remotePoint.X - originPoint.X) << (QRCodeImageReader.DECIMAL_POINT)) / r; //Cos
return angle;
}
internal static Point[] getCenter(Line[] crossLines)
{
System.Collections.ArrayList centers = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(10));
for (int i = 0; i < crossLines.Length - 1; i++)
{
Line compareLine = crossLines[i];
for (int j = i + 1; j < crossLines.Length; j++)
{
Line comparedLine = crossLines[j];
if (Line.isCross(compareLine, comparedLine))
{
int x = 0;
int y = 0;
if (compareLine.Horizontal)
{
x = compareLine.Center.X;
y = comparedLine.Center.Y;
}
else
{
x = comparedLine.Center.X;
y = compareLine.Center.Y;
}
centers.Add(new Point(x, y));
}
}
}
Point[] foundPoints = new Point[centers.Count];
for (int i = 0; i < foundPoints.Length; i++)
{
foundPoints[i] = (Point) centers[i];
//Console.out.println(foundPoints[i]);
}
//Console.out.println(foundPoints.length);
if (foundPoints.Length == 3)
{
canvas.drawPolygon(foundPoints, ThoughtWorks.QRCode.Codec.Util.Color_Fields.RED);
return foundPoints;
}
else
throw new FinderPatternNotFoundException("Invalid number of Finder Pattern detected");
}
//sort center of finder patterns as Left-Up: points[0], Right-Up: points[1], Left-Down: points[2].
internal static Point[] sort(Point[] centers, int[] angle)
{
Point[] sortedCenters = new Point[3];
int quadant = getURQuadant(angle);
switch (quadant)
{
case 1:
sortedCenters[1] = getPointAtSide(centers, Point.RIGHT, Point.BOTTOM);
sortedCenters[2] = getPointAtSide(centers, Point.BOTTOM, Point.LEFT);
break;
case 2:
sortedCenters[1] = getPointAtSide(centers, Point.BOTTOM, Point.LEFT);
sortedCenters[2] = getPointAtSide(centers, Point.TOP, Point.LEFT);
break;
case 3:
sortedCenters[1] = getPointAtSide(centers, Point.LEFT, Point.TOP);
sortedCenters[2] = getPointAtSide(centers, Point.RIGHT, Point.TOP);
break;
case 4:
sortedCenters[1] = getPointAtSide(centers, Point.TOP, Point.RIGHT);
sortedCenters[2] = getPointAtSide(centers, Point.BOTTOM, Point.RIGHT);
break;
}
//last of centers is Left-Up patterns one
for (int i = 0; i < centers.Length; i++)
{
if (!centers[i].equals(sortedCenters[1]) && !centers[i].equals(sortedCenters[2]))
{
sortedCenters[0] = centers[i];
}
}
return sortedCenters;
}
internal static int getURQuadant(int[] angle)
{
int sin = angle[0];
int cos = angle[1];
if (sin >= 0 && cos > 0)
return 1;
else if (sin > 0 && cos <= 0)
return 2;
else if (sin <= 0 && cos < 0)
return 3;
else if (sin < 0 && cos >= 0)
return 4;
return 0;
}
internal static Point getPointAtSide(Point[] points, int side1, int side2)
{
Point sidePoint = new Point();
int x = ((side1 == Point.RIGHT || side2 == Point.RIGHT)?0:System.Int32.MaxValue);
int y = ((side1 == Point.BOTTOM || side2 == Point.BOTTOM)?0:System.Int32.MaxValue);
sidePoint = new Point(x, y);
for (int i = 0; i < points.Length; i++)
{
switch (side1)
{
case Point.RIGHT:
if (sidePoint.X < points[i].X)
{
sidePoint = points[i];
}
else if (sidePoint.X == points[i].X)
{
if (side2 == Point.BOTTOM)
{
if (sidePoint.Y < points[i].Y)
{
sidePoint = points[i];
}
}
else
{
if (sidePoint.Y > points[i].Y)
{
sidePoint = points[i];
}
}
}
break;
case Point.BOTTOM:
if (sidePoint.Y < points[i].Y)
{
sidePoint = points[i];
}
else if (sidePoint.Y == points[i].Y)
{
if (side2 == Point.RIGHT)
{
if (sidePoint.X < points[i].X)
{
sidePoint = points[i];
}
}
else
{
if (sidePoint.X > points[i].X)
{
sidePoint = points[i];
}
}
}
break;
case Point.LEFT:
if (sidePoint.X > points[i].X)
{
sidePoint = points[i];
}
else if (sidePoint.X == points[i].X)
{
if (side2 == Point.BOTTOM)
{
if (sidePoint.Y < points[i].Y)
{
sidePoint = points[i];
}
}
else
{
if (sidePoint.Y > points[i].Y)
{
sidePoint = points[i];
}
}
}
break;
case Point.TOP:
if (sidePoint.Y > points[i].Y)
{
sidePoint = points[i];
}
else if (sidePoint.Y == points[i].Y)
{
if (side2 == Point.RIGHT)
{
if (sidePoint.X < points[i].X)
{
sidePoint = points[i];
}
}
else
{
if (sidePoint.X > points[i].X)
{
sidePoint = points[i];
}
}
}
break;
}
}
return sidePoint;
}
internal static int[] getWidth(bool[][] image, Point[] centers, int[] sincos)
{
int[] width = new int[3];
for (int i = 0; i < 3; i++)
{
bool flag = false;
int lx, rx;
int y = centers[i].Y;
for (lx = centers[i].X; lx > 0; lx--)
{
if (image[lx][y] == QRCodeImageReader.POINT_DARK && image[lx - 1][y] == QRCodeImageReader.POINT_LIGHT)
{
if (flag == false)
flag = true;
else
break;
}
}
flag = false;
for (rx = centers[i].X; rx < image.Length; rx++)
{
if (image[rx][y] == QRCodeImageReader.POINT_DARK && image[rx + 1][y] == QRCodeImageReader.POINT_LIGHT)
{
if (flag == false)
flag = true;
else
break;
}
}
width[i] = (rx - lx + 1);
}
return width;
}
internal static int calcRoughVersion(Point[] center, int[] width)
{
int dp = QRCodeImageReader.DECIMAL_POINT;
int lengthAdditionalLine = (new Line(center[UL], center[UR]).Length) << dp;
int avarageWidth = ((width[UL] + width[UR]) << dp) / 14;
int roughVersion = ((lengthAdditionalLine / avarageWidth) - 10) / 4;
if (((lengthAdditionalLine / avarageWidth) - 10) % 4 >= 2)
{
roughVersion++;
}
return roughVersion;
}
internal static int calcExactVersion(Point[] centers, int[] angle, int[] moduleSize, bool[][] image)
{
bool[] versionInformation = new bool[18];
Point[] points = new Point[18];
Point target;
Axis axis = new Axis(angle, moduleSize[UR]); //UR
axis.Origin = centers[UR];
for (int y = 0; y < 6; y++)
{
for (int x = 0; x < 3; x++)
{
target = axis.translate(x - 7, y - 3);
versionInformation[x + y * 3] = image[target.X][target.Y];
points[x + y * 3] = target;
}
}
canvas.drawPoints(points, ThoughtWorks.QRCode.Codec.Util.Color_Fields.RED);
int exactVersion = 0;
try
{
exactVersion = checkVersionInfo(versionInformation);
}
catch (InvalidVersionInfoException e)
{
canvas.println("Version info error. now retry with other place one.");
axis.Origin = centers[DL];
axis.ModulePitch = moduleSize[DL]; //DL
for (int x = 0; x < 6; x++)
{
for (int y = 0; y < 3; y++)
{
target = axis.translate(x - 3, y - 7);
versionInformation[y + x * 3] = image[target.X][target.Y];
points[x + y * 3] = target;
}
}
canvas.drawPoints(points, ThoughtWorks.QRCode.Codec.Util.Color_Fields.RED);
try
{
exactVersion = checkVersionInfo(versionInformation);
}
catch (VersionInformationException e2)
{
throw e2;
}
}
return exactVersion;
}
internal static int checkVersionInfo(bool[] target)
{
// note that this method includes BCH 18-6 Error Correction
// see page 67 on JIS-X-0510(2004)
int errorCount = 0, versionBase;
for (versionBase = 0; versionBase < VersionInfoBit.Length; versionBase++)
{
errorCount = 0;
for (int j = 0; j < 18; j++)
{
if (target[j] ^ (VersionInfoBit[versionBase] >> j) % 2 == 1)
errorCount++;
}
if (errorCount <= 3)
break;
}
if (errorCount <= 3)
return 7 + versionBase;
else
throw new InvalidVersionInfoException("Too many errors in version information");
}
static FinderPattern()
{
canvas = QRCodeDecoder.Canvas;
}
}
}