Question

24. Write methods rotateLeft and rotateRight that rotate the pixels of an image counter-clockwise or clockwise by 90 degrees respectively. You should not assume that the image is square in shape; its width and height might be different.

Use Java.

Answer 1

CODE :

import java.awt.Color;
import java.awt.Graphics;
pudic class DegreeRotation
{
//Method Rotate Left
pudic static void rotateLeft(DrawingPanel pan)
{
//Extracts pixels from original image
color[][] pixels = pan.getPixel();
for(int col = 0; col < pixels[0].length; col++ )
{
for(int row=0: row < pixels.length/2; row++)
{
//Swapping operation
int opp = pixels[0].1ength -1 - col;
Color px = pixels[row][col];
pixels[opp][row] = pixels[opp][row];
pixels[opp][raw] = px;
}
}
//Sets the panel
pan.setPixels(pixels);
}
//Method Rotate Right
public static void rotateRight(DrawingPanel pan)
{
//Extracts pixels from original image
color[][] pixels = pan.getPixels();
for(int col = 0; col < pixels[O].length; col++ )
{
for(int row = 0; row < pixels.length/2; row++)
{
//Swapping operation
int opp = pixels[0].1ength -1 - col;
Color px = pixels[col][row];
pixels[row][opp] = pixels[row][oPP];
pixels[rowl[opp] = PX;
}
}
//Sets the panel
pan.setPixels(pixels);
}
//Main Method
public static void main(String[] args)
{
Graphics GrLeft, GrRight;
DrawingPanel DpLeft = new DrawingPanel(200, 200);
DrawingPanel DpRight= new DrawingPanel(200, 200);
GrLeft = DpLeftgetGraphics();
GrRight = DpRightgetGraphics();
//Displays message
GrLeftdrawString("hello world", 20, 20);
//Calls the method to rotate left
rotateLeft(DpLeft);
GrRightdrawString("hello world", 20, 20):
//Calls the method to rotate right
rotateRight(DpRight);
}
}