msb-public
/
QR-Code-generator
mirror of https://github.com/nayuki/QR-Code-generator
4
3
Code Issues Projects Releases Wiki Activity

0527 extract method 적용 / switch 문장 Command pattern 적용할 예정

Browse Source
pull/90/head
wslbal 5 years ago
parent 92b35766fb
commit 15f548220b
1 changed files with 220 additions and 212 deletions
Show Stats Download Patch File Download Diff File

200
java/src/main/java/io/nayuki/qrcodegen/QrCode.java
Unescape View File

@ -325,12 +325,12 @@ public final class QrCode {
throw new IllegalArgumentException("Border must be non-negative");
long brd = border;
StringBuilder sb = new StringBuilder()
.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n")
.append("<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n")
.append(String.format("<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" viewBox=\"0 0 %1$d %1$d\" stroke=\"none\">\n",
size + brd * 2))
.append("\t<rect width=\"100%\" height=\"100%\" fill=\"#FFFFFF\"/>\n")
.append("\t<path d=\"");
.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n")
.append("<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n")
.append(String.format("<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" viewBox=\"0 0 %1$d %1$d\" stroke=\"none\">\n",
size + brd * 2))
.append("\t<rect width=\"100%\" height=\"100%\" fill=\"#FFFFFF\"/>\n")
.append("\t<path d=\"");
for (int y = 0; y < size; y++) {
for (int x = 0; x < size; x++) {
if (getModule(x, y)) {
@ -341,9 +341,9 @@ public final class QrCode {
}
}
return sb
.append("\" fill=\"#000000\"/>\n")
.append("</svg>\n")
.toString();
.append("\" fill=\"#000000\"/>\n")
.append("</svg>\n")
.toString();
}
@ -542,7 +542,7 @@ public final class QrCode {
// The function modules must be marked and the codeword bits must be drawn
// before masking. Due to the arithmetic of XOR, calling applyMask() with
// the same mask value a second time will undo the mask. A final well-formed
// QR Code needs exactly one (not zero, two, etc.) mask applied. switch-statement refactoring
// QR Code needs exactly one (not zero, two, etc.) mask applied. Command pattern
private void applyMask(int msk) {
if (msk < 0 || msk > 7)
throw new IllegalArgumentException("Mask value out of range");
@ -550,15 +550,15 @@ public final class QrCode {
for (int x = 0; x < size; x++) {
boolean invert;
switch (msk) {
case 0: invert = (x + y) % 2 == 0; break;
case 1: invert = y % 2 == 0; break;
case 2: invert = x % 3 == 0; break;
case 3: invert = (x + y) % 3 == 0; break;
case 4: invert = (x / 3 + y / 2) % 2 == 0; break;
case 5: invert = x * y % 2 + x * y % 3 == 0; break;
case 6: invert = (x * y % 2 + x * y % 3) % 2 == 0; break;
case 7: invert = ((x + y) % 2 + x * y % 3) % 2 == 0; break;
default: throw new AssertionError();
case 0: invert = (x + y) % 2 == 0; break;
case 1: invert = y % 2 == 0; break;
case 2: invert = x % 3 == 0; break;
case 3: invert = (x + y) % 3 == 0; break;
case 4: invert = (x / 3 + y / 2) % 2 == 0; break;
case 5: invert = x * y % 2 + x * y % 3 == 0; break;
case 6: invert = (x * y % 2 + x * y % 3) % 2 == 0; break;
case 7: invert = ((x + y) % 2 + x * y % 3) % 2 == 0; break;
default: throw new AssertionError();
}
modules[y][x] ^= invert & !isFunction[y][x];
}
@ -571,17 +571,7 @@ public final class QrCode {
// This method applies and returns the actual mask chosen, from 0 to 7.
private int handleConstructorMasking(int msk) {
if (msk == -1) { // Automatically choose best mask
int minPenalty = Integer.MAX_VALUE;
for (int i = 0; i < 8; i++) {
applyMask(i);
drawFormatBits(i);
int penalty = getPenaltyScore();
if (penalty < minPenalty) {
msk = i;
minPenalty = penalty;
}
applyMask(i); // Undoes the mask due to XOR
}
msk = chooseBestMask(msk);
}
assert 0 <= msk && msk <= 7;
applyMask(msk); // Apply the final choice of mask
@ -589,10 +579,58 @@ public final class QrCode {
return msk; // The caller shall assign this value to the final-declared field
}
private int chooseBestMask(int msk) {
int minPenalty = Integer.MAX_VALUE;
for (int i = 0; i < 8; i++) {
applyMask(i);
drawFormatBits(i);
int penalty = getPenaltyScore();
if (penalty < minPenalty) {
msk = i;
minPenalty = penalty;
}
applyMask(i); // Undoes the mask due to XOR
}
return msk;
}
private int havingSameColor(int run, boolean runColor, int[] runHistory, int result, int y, int x) {
if (modules[y][x] == runColor) {
run++;
if (run == 5)
result += PENALTY_N1;
else if (run > 5)
result++;
} else {
finderPenaltyAddHistory(run, runHistory);
if (!runColor)
result += finderPenaltyCountPatterns(runHistory) * PENALTY_N3;
runColor = modules[y][x];
run = 1;
}
return result;
}
private int twobytwoHavingSameColor(boolean[][] modules) {
int result = 0;
// 2*2 blocks of modules having same color.
for (int y = 0; y < size - 1; y++) {
for (int x = 0; x < size - 1; x++) {
boolean color = modules[y][x];
if ( color == modules[y][x + 1] &&
color == modules[y + 1][x] &&
color == modules[y + 1][x + 1])
result += PENALTY_N2;
}
}
return result;
}
// Calculates and returns the penalty score based on state of this QR Code's current modules.
// This is used by the automatic mask choice algorithm to find the mask pattern that yields the lowest score. duplication code extract
// This is used by the automatic mask choice algorithm to find the mask pattern that yields the lowest score.
private int getPenaltyScore() {
int result = 0;
// Adjacent modules in row having same color, and finder-like patterns
@ -600,21 +638,8 @@ public final class QrCode {
boolean runColor = false;
int runX = 0;
int[] runHistory = new int[7];
result += havingSameColor();
for (int x = 0; x < size; x++) {
if (modules[y][x] == runColor) {
runX++;
if (runX == 5)
result += PENALTY_N1;
else if (runX > 5)
result++;
} else {
finderPenaltyAddHistory(runX, runHistory);
if (!runColor)
result += finderPenaltyCountPatterns(runHistory) * PENALTY_N3;
runColor = modules[y][x];
runX = 1;
}
result += havingSameColor(runX, runColor, runHistory, result, y, x);
}
result += finderPenaltyTerminateAndCount(runColor, runX, runHistory) * PENALTY_N3;
}
@ -624,33 +649,13 @@ public final class QrCode {
int runY = 0;
int[] runHistory = new int[7];
for (int y = 0; y < size; y++) {
if (modules[y][x] == runColor) {
runY++;
if (runY == 5)
result += PENALTY_N1;
else if (runY > 5)
result++;
} else {
finderPenaltyAddHistory(runY, runHistory);
if (!runColor)
result += finderPenaltyCountPatterns(runHistory) * PENALTY_N3;
runColor = modules[y][x];
runY = 1;
}
result += havingSameColor(runY, runColor, runHistory, result, y, x);
}
result += finderPenaltyTerminateAndCount(runColor, runY, runHistory) * PENALTY_N3;
}
// 2*2 blocks of modules having same color. extract method to reduce method size
for (int y = 0; y < size - 1; y++) {
for (int x = 0; x < size - 1; x++) {
boolean color = modules[y][x];
if ( color == modules[y][x + 1] &&
color == modules[y + 1][x] &&
color == modules[y + 1][x + 1])
result += PENALTY_N2;
}
}
result += twobytwoHavingSameColor(modules);
// Balance of black and white modules
int black = 0;
@ -667,8 +672,6 @@ public final class QrCode {
return result;
}
/*---- Private helper functions ----*/
// Returns an ascending list of positions of alignment patterns for this version number.
@ -695,11 +698,18 @@ public final class QrCode {
// Returns the number of data bits that can be stored in a QR Code of the given version number, after
// all function modules are excluded. This includes remainder bits, so it might not be a multiple of 8.
// The result is in the range [208, 29648]. This could be implemented as a 40-entry lookup table. replace integer to understandable word
// The result is in the range [208, 29648]. This could be implemented as a 40-entry lookup table.
private static int getNumRawDataModules(int ver) {
if (ver < MIN_VERSION || ver > MAX_VERSION)
throw new IllegalArgumentException("Version number out of range");
int result = calculateNumOfModules(ver);
assert 208 <= result && result <= 29648;
return result;
}
private static int calculateNumOfModules(int ver) {
int size = ver * 4 + 17;
int result = size * size; // Number of modules in the whole QR Code square
result -= 8 * 8 * 3; // Subtract the three finders with separators
@ -714,11 +724,9 @@ public final class QrCode {
if (ver >= 7)
result -= 6 * 3 * 2; // Subtract version information
}
assert 208 <= result && result <= 29648;
return result;
}
// Returns a Reed-Solomon ECC generator polynomial for the given degree. This could be
// implemented as a lookup table over all possible parameter values, instead of as an algorithm.
private static byte[] reedSolomonComputeDivisor(int degree) {
@ -766,14 +774,14 @@ public final class QrCode {
// are unsigned 8-bit integers. This could be implemented as a lookup table of 256*256 entries of uint8.
private static int reedSolomonMultiply(int x, int y) {
assert x >> 8 == 0 && y >> 8 == 0;
// Russian peasant multiplication
int z = 0;
for (int i = 7; i >= 0; i--) {
z = (z << 1) ^ ((z >>> 7) * 0x11D);
z ^= ((y >>> i) & 1) * x;
}
assert z >>> 8 == 0;
return z;
// Russian peasant multiplication
int z = 0;
for (int i = 7; i >= 0; i--) {
z = (z << 1) ^ ((z >>> 7) * 0x11D);
z ^= ((y >>> i) & 1) * x;
}
assert z >>> 8 == 0;
return z;
}
@ -782,8 +790,8 @@ public final class QrCode {
// This stateless pure function could be implemented as a (40*4)-cell lookup table.
static int getNumDataCodewords(int ver, Ecc ecl) {
return getNumRawDataModules(ver) / 8
- ECC_CODEWORDS_PER_BLOCK [ecl.ordinal()][ver]
* NUM_ERROR_CORRECTION_BLOCKS[ecl.ordinal()][ver];
- ECC_CODEWORDS_PER_BLOCK [ecl.ordinal()][ver]
* NUM_ERROR_CORRECTION_BLOCKS[ecl.ordinal()][ver];
}
@ -794,7 +802,7 @@ public final class QrCode {
assert n <= size * 3;
boolean core = n > 0 && runHistory[2] == n && runHistory[3] == n * 3 && runHistory[4] == n && runHistory[5] == n;
return (core && runHistory[0] >= n * 4 && runHistory[6] >= n ? 1 : 0)
+ (core && runHistory[6] >= n * 4 && runHistory[0] >= n ? 1 : 0);
+ (core && runHistory[6] >= n * 4 && runHistory[0] >= n ? 1 : 0);
}
@ -842,21 +850,21 @@ public final class QrCode {
private static final byte[][] ECC_CODEWORDS_PER_BLOCK = {
// Version: (note that index 0 is for padding, and is set to an illegal value)
//0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40 Error correction level
{-1, 7, 10, 15, 20, 26, 18, 20, 24, 30, 18, 20, 24, 26, 30, 22, 24, 28, 30, 28, 28, 28, 28, 30, 30, 26, 28, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30}, // Low
{-1, 10, 16, 26, 18, 24, 16, 18, 22, 22, 26, 30, 22, 22, 24, 24, 28, 28, 26, 26, 26, 26, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28}, // Medium
{-1, 13, 22, 18, 26, 18, 24, 18, 22, 20, 24, 28, 26, 24, 20, 30, 24, 28, 28, 26, 30, 28, 30, 30, 30, 30, 28, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30}, // Quartile
{-1, 17, 28, 22, 16, 22, 28, 26, 26, 24, 28, 24, 28, 22, 24, 24, 30, 28, 28, 26, 28, 30, 24, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30}, // High
// Version: (note that index 0 is for padding, and is set to an illegal value)
//0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40 Error correction level
{-1, 7, 10, 15, 20, 26, 18, 20, 24, 30, 18, 20, 24, 26, 30, 22, 24, 28, 30, 28, 28, 28, 28, 30, 30, 26, 28, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30}, // Low
{-1, 10, 16, 26, 18, 24, 16, 18, 22, 22, 26, 30, 22, 22, 24, 24, 28, 28, 26, 26, 26, 26, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28}, // Medium
{-1, 13, 22, 18, 26, 18, 24, 18, 22, 20, 24, 28, 26, 24, 20, 30, 24, 28, 28, 26, 30, 28, 30, 30, 30, 30, 28, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30}, // Quartile
{-1, 17, 28, 22, 16, 22, 28, 26, 26, 24, 28, 24, 28, 22, 24, 24, 30, 28, 28, 26, 28, 30, 24, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30}, // High
};
private static final byte[][] NUM_ERROR_CORRECTION_BLOCKS = {
// Version: (note that index 0 is for padding, and is set to an illegal value)
//0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40 Error correction level
{-1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 4, 4, 4, 4, 4, 6, 6, 6, 6, 7, 8, 8, 9, 9, 10, 12, 12, 12, 13, 14, 15, 16, 17, 18, 19, 19, 20, 21, 22, 24, 25}, // Low
{-1, 1, 1, 1, 2, 2, 4, 4, 4, 5, 5, 5, 8, 9, 9, 10, 10, 11, 13, 14, 16, 17, 17, 18, 20, 21, 23, 25, 26, 28, 29, 31, 33, 35, 37, 38, 40, 43, 45, 47, 49}, // Medium
{-1, 1, 1, 2, 2, 4, 4, 6, 6, 8, 8, 8, 10, 12, 16, 12, 17, 16, 18, 21, 20, 23, 23, 25, 27, 29, 34, 34, 35, 38, 40, 43, 45, 48, 51, 53, 56, 59, 62, 65, 68}, // Quartile
{-1, 1, 1, 2, 4, 4, 4, 5, 6, 8, 8, 11, 11, 16, 16, 18, 16, 19, 21, 25, 25, 25, 34, 30, 32, 35, 37, 40, 42, 45, 48, 51, 54, 57, 60, 63, 66, 70, 74, 77, 81}, // High
// Version: (note that index 0 is for padding, and is set to an illegal value)
//0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40 Error correction level
{-1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 4, 4, 4, 4, 4, 6, 6, 6, 6, 7, 8, 8, 9, 9, 10, 12, 12, 12, 13, 14, 15, 16, 17, 18, 19, 19, 20, 21, 22, 24, 25}, // Low
{-1, 1, 1, 1, 2, 2, 4, 4, 4, 5, 5, 5, 8, 9, 9, 10, 10, 11, 13, 14, 16, 17, 17, 18, 20, 21, 23, 25, 26, 28, 29, 31, 33, 35, 37, 38, 40, 43, 45, 47, 49}, // Medium
{-1, 1, 1, 2, 2, 4, 4, 6, 6, 8, 8, 8, 10, 12, 16, 12, 17, 16, 18, 21, 20, 23, 23, 25, 27, 29, 34, 34, 35, 38, 40, 43, 45, 48, 51, 53, 56, 59, 62, 65, 68}, // Quartile
{-1, 1, 1, 2, 4, 4, 4, 5, 6, 8, 8, 11, 11, 16, 16, 18, 16, 19, 21, 25, 25, 25, 34, 30, 32, 35, 37, 40, 42, 45, 48, 51, 54, 57, 60, 63, 66, 70, 74, 77, 81}, // High
};

Write Preview
Loading…
Cancel
Save