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SandUtilities.java
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SandUtilities.java
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//By: Arnav Garg
import java.awt.Color;
public class SandUtilities
{
//pre : c != null
//post: returns the inverted color from the one sent as c
public static Color invert(Color c)
{
return new Color(255-c.getRed(), 255-c.getGreen(), 255-c.getBlue());
}
//pre: m != null
//post: for each non-null element of m, changes it to its inverted color
// skips any color with the value skip1 and skip2, leaving them unchanged
public static void invertColors(Color[][]m, Color skip1, Color skip2)
{
for(int r = 0; r < m.length; r++) //rows
{
for(int c = 0; c < m[0].length; c++) //columns
{
if(m[r][c] != null && m[r][c] != skip1 && m[r][c] != skip2)
{
invert(m[r][c]);
}
}
}
}
//pre: m is a square 2-D array (m.length==m[0].length)
//post: flips the array upside down
public static void flipUpsideDown(Object[][]m)
{
for(int r = 0; r < m.length/2; r++) //rows
{
swap(m, r, -1);
}
}
//pre: m is a square 2-D array (m.length==m[0].length)
//post: rotates the array 90 degrees to the left
public static void rotateLeft(Object[][] m)
{
transpose(m);
for(int r = 0; r < m.length/2; r++) //rows
{
swap(m, r, -1);
}
}
//pre: m is a square 2-D array (m.length==m[0].length)
//post: rotates the array 90 degrees to the right
public static void rotateRight(Object[][] m)
{
transpose(m);
for(int r = 0; r < m.length/2; r++) //rows
{
for(int c =0; c<m[0].length; c++)
{
swap(m, r, c);
}
}
}
public static void swap(Object[][] m, int r, int c)
{
if(c==-1)
{
Object[] temp = m[r];
m[r]= m[m.length - r - 1];
m[m.length - r - 1] = temp;
}
else
{
Object temp = m[c][r];
m[c][r]= m[c][m.length - r - 1];
m[c][m.length - r - 1] = temp;
}
}
public static void transpose(Object[][] m)
{
for(int r = 0; r < m.length; r++) //rows
{
for(int c = r; c < m[0].length; c++) //columns
{
Object temp = m[c][r];
m[c][r] = m[r][c];
m[r][c] = temp;
}
}
}
}