Search for the Array

**Lurie1** · February 17th, 2012, 07:44 PM

<
import java.awt.*;
import java.awt.event.*;
import java.awt.Robot;
import java.awt.AWTException;
import java.awt.Rectangle;
import java.awt.Color;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
 
public class Forage
{
	public static void main() throws Exception 
	{
	int[] anArray;
	Robot robot = new Robot();
	anArray = new int[5];
 
	anArray[4] = (new Color(91, 147, 191)).getRGB();
	anArray[3] = (new Color(215, 201, 79)).getRGB();
	anArray[2] = (new Color(74, 93, 132)).getRGB();
	anArray[1] = (new Color(74, 93, 132)).getRGB();
	anArray[0] = (new Color(91, 147, 191)).getRGB();	
	Rectangle rectangle = new Rectangle(0, 0, 1365, 770);
	BufferedImage image = robot.createScreenCapture(rectangle);
	int[] pixels = image.getRGB(0, 0, image.getWidth(), image.getHeight(), null, 0, image.getWidth()); 
 
	for(int x = 0; x < rectangle.getWidth(); x++)
		{
		for(int y = 0; y < rectangle.getHeight(); y++)
			{	
			for (int i = 0; i < pixels.length; i++) 
				{
				if (Array.equals(anArray, Array.copyOfRange(pixels, i, i + anArray.length))) 
					{
					robot.mouseMove(x, y);
					robot.mousePress(java.awt.event.InputEvent.BUTTON1_MASK);
					robot.delay(10);
					robot.mouseRelease(java.awt.event.InputEvent.BUTTON1_MASK);
					System.out.println("opened");
					}
				}
			}
		}
	}
}
>

i am getting 6 errors:
this error is the first 4 of the six, i thought image was defined by the buffered image line of code, line 29:

java:27
cannot find symbol
variable image
int[] pixels = image.getRGB(0, 0, image.getWidth()

error 2:
this error is the last 2 of the 6:

java:36 cannot find symbol
variable Array
if (Array.equals(anArray,

and i don't know how to solve this problem at all

**Norm** · February 17th, 2012, 07:50 PM

cannot find symbol
variable image

Where is the variable image defined? It looks like it is defined AFTER you try to use it.
Define it BEFORE you try to use it.

Think of it this way: If you went into a bank and tried to withdrawn money before you opened an account, the bank would object. The compiler is like that. It wants things done in the proper order.

cannot find symbol
variable Array

Where is the variable Array defined? The compiler can not find a definition for it.

**Lurie1** · February 17th, 2012, 09:57 PM

thanks norm i didn't realize i had them in the wrong order, i just updated the code to reflect this! but i don't have to define the variable i guess im using the wrong variable that bit of code where i use Array is suppose to search the image for the array of pixels so im guessing i should change Array to image right?

**Norm** · February 17th, 2012, 10:11 PM

i didn't realize i had them in the wrong order

The computer executes the statements in the order they are placed in the program. This is a VERY BASIC concept.
If you don't understand that, you are going to have a very hard time writing programs.

suppose to search the image for the array of pixels

An image is not an array. You can get the RGB values for individual pixels using some methods and compare those obtained pixels against the contents of an array.
But that is not what your code is doing. It has two arrays: anArray and pixels.
It looks like you are trying to "compare" them?

I suggest that you write a small simple program to work out the logic and methods to do this array searching.
Define two arrays, one short and one longer with some values in them and then write a "compare" to see if the shorter array is contained in the longer array.
This will allow you to test many different cases and be sure the code works before you move the logic into the current program you are working on.

**Lurie1** · February 17th, 2012, 10:28 PM

ok will do
ps i understood the above just did not check if they were in the correct order assuming something was wrong with the code not the placement.

**Lurie1** · February 18th, 2012, 01:29 AM

ok newbie question but once i set a rectangle using the robot class like the one above is there a way i can set that as the screen so when i say robot.mouseMove(x, y) it will move to the x, y inside of the rectangle not the x, y on the desktop?

**Norm** · February 18th, 2012, 07:41 AM

Read the API doc for the mouseMove method. Does where do the x,y parameters refer to?

You may have to compute the x,y relative to the rectangle given the rectangle's location on the screen. Take a piece of paper and draw them and see how to convert from one to the other.

**Lurie1** · February 18th, 2012, 11:19 AM

well the problem because i could use screen coordinates for x, y but the rectangle will be in a different place every rime a random place on screen so would i have to say for each chunk of code set all x, y relative to a point on the screen or could i just define rectangle as the screen and all coordinates given are called inside rectangle? also mouseMove calls x, y on screen coordinates can i define screen as rectangle?

**Norm** · February 18th, 2012, 11:24 AM

Did you try this:
Take a piece of paper and draw the screen and the rectangle and see how to convert the x,y values from one to the other. The screen's x,y will be the rectangle's location x,y plus the x,y within the rectangle

**Lurie1** · February 18th, 2012, 11:32 AM

yea i drew them out, ok well i guess if they have to be set like that they do...

**Norm** · February 18th, 2012, 11:33 AM

You need to do what the methods require.

**Lurie1** · February 18th, 2012, 12:12 PM

so the steps for specifying a point to either check would be, rectangle coordinates x, y + coordinates specified right?

**Norm** · February 18th, 2012, 12:13 PM

Who are you giving the point's location to? That should determine how you specify its values.

**Lurie1** · February 18th, 2012, 12:41 PM

to a robot function i want to move the mouse to that point

**Norm** · February 18th, 2012, 12:45 PM

Then read the API doc for the method you want to use and see what it requires.

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