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Convert JFrame graphics into a jpeg file
Hello everyone, I have had this problem for quite a while but never thought to come and ask on a forum. I just looked around because I thought it was a simple problem that required a key word in the coding or something. Turns out, I can't find any help anywhere.
My problem is I want to turn a user specified graphic made in a simple JFrame program into a jpeg (or really any 'picture' format) but I don't know how. The way I have saved it is by saving the pixels in the pic into an array that is printed into a text file. So really, my jpeg file is a text file. This runs far too slow because I need to be able to load the pic several times in animations.
Here is the code. It's a very simple, user size specified, black and white checkered pic that is saved into a text file to either be loaded or written over by a new pic the next time you run the program:
/*Hello, welcome to SimplePic. This program: * 1. asks weather you want to create a new pic or load the last pic created. * 2. if you choose to make a new pic, it asks for the width and height in pixels * 3. the program then creates a checkered pic of the specified size (or loads the last pic you made) starting with a black pixel in the top left corner always. *To see the save file, look for a text file called 'picText.txt' in the same folder as this program. It will have 2 numbers for the first 2 lines (width then height), *and then it will have (if word wrap is turned off; it doesn't have to be) a square of letters ababab...representing the pixel array in this program. * *MY MAIN PROBLEM: I want to convert this text file/pic into a jpeg or some kind of picture file so that: * 1. a text file is not necessary * 2. the program loads the pic much faster like it was openning a pic you drew in microsoft paint. *I need this because I want to be able to create this pic, but then load it repeatedly in animations. * *Good luck and thank you. *-Ben */ //needed libraries import javax.swing.JFrame; import java.awt.*; import java.util.*; import java.io.*; public class SimplePic extends JFrame{ //variables private Color c1 = new Color(0,0,0);//black private Color c2 = new Color(255,255,255);//white private char char1 = 'a'; private char char2 = 'b'; private char[][]pixels; private int width,height; private Container contents; //new SimplePic public SimplePic(int xsize,int ysize){ width=xsize; height=ysize; pixels=new char[xsize][ysize]; generatePic(); contents=getContentPane(); setSize(xsize,ysize); setVisible(true); } //load SimplePic public SimplePic(){ super("SimplePic"); loadPic("picText.txt"); contents=getContentPane(); setSize(width,height); setVisible(true); } //generate Pic, creates a fine checkered pic based on remainders when dividing by 2 public void generatePic(){ for(int y=0;y<height;y++){//top to bottom for(int x=0;x<width;x++){//left to right //if x and y coordinate pixel has no remainder, set to black if(x%2==0&&y%2==0){ pixels[x][y]=char1; } //if x coordinate pixel has a remainder of 1, but y does not, set to white if(x%2==1&&y%2==0){ pixels[x][y]=char2; } //if y coordinate pixel has a remainder of 1, but x does not, set to white if(x%2==0&&y%2==1){ pixels[x][y]=char2; } //if x and y coordinate pixel has a remainder of 1, set to black if(x%2==1&&y%2==1){ pixels[x][y]=char1; } } } } //render pic public void paint(Graphics g){ super.paint(g); Color color=c1; for(int y=0;y<height;y++){ for(int x=0;x<width;x++){ //convert char array to colors black and white switch(pixels[x][y]){ case 'a':color=c1;break; case 'b':color=c2;break; } g.setColor(color); g.fillRect(x,y,1,1); } } } //main method public static void main(String[]args){ //i did not bother making any code for input error checking, this is a bare bones example Scanner scan=new Scanner(System.in); System.out.println("new pic or load pic? (n or l)"); String choice=scan.nextLine(); char c=choice.charAt(0); if(c=='n'){ System.out.println("please enter width of pic (int)"); int x=scan.nextInt(); System.out.println("please enter height of pic (int)"); int y=scan.nextInt(); SimplePic newPic=new SimplePic(x,y); newPic.savePic("picText.txt"); newPic.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } if(c=='l'){ SimplePic loadPic=new SimplePic(); loadPic.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } } //save current pic public void savePic(String fn){ try{ PrintWriter out=new PrintWriter(new FileWriter(fn)); //the first 2 lines of the txt file are reserved for width and height out.println(width); out.println(height); //turn word wrap off in the txt file to see a checkered square of letters representing the pixels array for(int y=0;y<height;y++){ for(int x=0;x<width;x++){ out.print(pixels[x][y]); } out.println(); } out.close(); System.out.println("Saved to "+fn); } catch(IOException e){System.out.println("Error saving to "+fn);} } //load previous pic public void loadPic(String fn){ System.out.println("Reading "+fn+", loading..."); try{ BufferedReader br=new BufferedReader(new FileReader(fn)); String line; char charLine[]; int numRows=0; //read the first 2 lines of the txt file to get the width and height String swidth=br.readLine(); String sheight=br.readLine(); width=Integer.parseInt(swidth); height=Integer.parseInt(sheight); //turn the square of letters in the txt file into the pixel array (turn word wrap off in the txt file to see more clearly) pixels=new char[width][height]; while((line=br.readLine())!=null){ while(numRows<height){ charLine=line.toCharArray(); int x=0; while((x<width)){ pixels[x][numRows]=charLine[x]; x++; } numRows++; line=br.readLine(); } } br.close(); } catch (IOException e){ System.out.println("Error reading maze plan from " + fn); System.exit(0); } } }
I think I made it as clear as possible, but if you have any questions, I'd be glad to answer them. I really need this answered.
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