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java.lang.Object com.itextpdf.text.pdf.qrcode.BitMatrix
public final class BitMatrix
Represents a 2D matrix of bits. In function arguments below, and throughout the common module, x is the column position, and y is the row position. The ordering is always x, y. The origin is at the top-left.
Internally the bits are represented in a 1-D array of 32-bit ints. However, each row begins with a new int. This is done intentionally so that we can copy out a row into a BitArray very efficiently.
The ordering of bits is row-major. Within each int, the least significant bits are used first, meaning they represent lower x values. This is compatible with BitArray's implementation.
Field Summary | |
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int[] |
bits
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int |
height
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int |
rowSize
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int |
width
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Constructor Summary | |
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BitMatrix(int dimension)
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BitMatrix(int width,
int height)
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Method Summary | |
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void |
clear()
Clears all bits (sets to false). |
void |
flip(int x,
int y)
Flips the given bit. |
boolean |
get(int x,
int y)
Gets the requested bit, where true means black. |
int |
getDimension()
This method is for compatibility with older code. |
int |
getHeight()
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BitArray |
getRow(int y,
BitArray row)
A fast method to retrieve one row of data from the matrix as a BitArray. |
int |
getWidth()
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void |
set(int x,
int y)
Sets the given bit to true. |
void |
setRegion(int left,
int top,
int width,
int height)
Sets a square region of the bit matrix to true. |
String |
toString()
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Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
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public final int width
public final int height
public final int rowSize
public final int[] bits
Constructor Detail |
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public BitMatrix(int dimension)
public BitMatrix(int width, int height)
Method Detail |
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public boolean get(int x, int y)
Gets the requested bit, where true means black.
x
- The horizontal component (i.e. which column)y
- The vertical component (i.e. which row)
public void set(int x, int y)
Sets the given bit to true.
x
- The horizontal component (i.e. which column)y
- The vertical component (i.e. which row)public void flip(int x, int y)
Flips the given bit.
x
- The horizontal component (i.e. which column)y
- The vertical component (i.e. which row)public void clear()
public void setRegion(int left, int top, int width, int height)
Sets a square region of the bit matrix to true.
left
- The horizontal position to begin at (inclusive)top
- The vertical position to begin at (inclusive)width
- The width of the regionheight
- The height of the regionpublic BitArray getRow(int y, BitArray row)
y
- The row to retrieverow
- An optional caller-allocated BitArray, will be allocated if null or too small
public int getWidth()
public int getHeight()
public int getDimension()
public String toString()
toString
in class Object
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