Originally Posted by sciwizeh

a search i did i found this:

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java Syntax (Toggle Plain Text)

public static BufferedImage rotate(Image image, double angle, int cx, int cy){
		int width = image.getWidth(null);
		int height = image.getHeight(null);
 
		//The bounds of the image
		int minX, minY, maxX, maxY;
		minX = minY = maxX = maxY = 0;
 
		//create an array containing the corners of the image
		//In the order TL,TR,BR,BL
		int[] corners = { 0, 0, width, 0, width, height, 0, height };
 
		double theta = Math.toRadians(angle);
		for(int i=0;i<corners.length;i+=2){
			//Rotates the given point theta radians around (cx,cy)
			int x = (int)(Math.cos(theta)*(corners[i]-cx) -
				Math.sin(theta)*(corners[i+1]-cy)+cx);
			int y = (int)(Math.sin(theta)*(corners[i]-cx) +
				Math.cos(theta)*(corners[i+1]-cy)+cy);
 
			//Update our bounds
			if(x>maxX) maxX = x;
			if(x<minX) minX = x;
			if(y>maxY) maxY = y;
			if(y<minY) minY = y;
		}
 
		//Where the center of the old image should be on the image we are
		//just about to create so that the image is all in viewable space.
		cx = (int)(cx-minX);
		cy = (int)(cy-minY);
 
		//Create a new image such that when we roate the old image, no pixels
		//will have a negative x or y coordinate.
		BufferedImage bi = createBufferedImage(maxX-minX, maxY-minY, true);
		Graphics2D g2 = bi.createGraphics();
 
 
		//Finally start the rotation process
		AffineTransform at = new AffineTransform();
		at.rotate(theta,cx,cy);
		g2.setTransform(at);
 
		g2.drawImage(image,-minX,-minY,null);
 
		g2.dispose();
 
		return toBufferedImage(bi);
	}

public static BufferedImage rotate(Image image, double angle, int cx, int cy){ int width = image.getWidth(null); int height = image.getHeight(null); //The bounds of the image int minX, minY, maxX, maxY; minX = minY = maxX = maxY = 0; //create an array containing the corners of the image //In the order TL,TR,BR,BL int[] corners = { 0, 0, width, 0, width, height, 0, height }; double theta = Math.toRadians(angle); for(int i=0;i<corners.length;i+=2){ //Rotates the given point theta radians around (cx,cy) int x = (int)(Math.cos(theta)*(corners[i]-cx) - Math.sin(theta)*(corners[i+1]-cy)+cx); int y = (int)(Math.sin(theta)*(corners[i]-cx) + Math.cos(theta)*(corners[i+1]-cy)+cy); //Update our bounds if(x>maxX) maxX = x; if(x<minX) minX = x; if(y>maxY) maxY = y; if(y<minY) minY = y; } //Where the center of the old image should be on the image we are //just about to create so that the image is all in viewable space. cx = (int)(cx-minX); cy = (int)(cy-minY); //Create a new image such that when we roate the old image, no pixels //will have a negative x or y coordinate. BufferedImage bi = createBufferedImage(maxX-minX, maxY-minY, true); Graphics2D g2 = bi.createGraphics(); //Finally start the rotation process AffineTransform at = new AffineTransform(); at.rotate(theta,cx,cy); g2.setTransform(at); g2.drawImage(image,-minX,-minY,null); g2.dispose(); return toBufferedImage(bi); }

it rotates an entire image, so you could make an image write a line on it and pass it to this method, it's likely to be slow, i don't know much about afflinetransform

Originally Posted by Alex Edwards

Do you want to draw an image from a file, or do you want to be able to "rotate" a set of pixels such that they emulate a rotating String?

This can be either really simple or hard depending on where you want to rotate. If you have variable rotation points, this sill be incredibly hard.

Originally Posted by sciwizeh

i didn't notice it had these calls... i'll write a method like this myself, that doesn't use afflinetransform.. but it will be slow, i should be able to post one before midnight, but likely in the next hour.

Originally Posted by sciwizeh

ok, I wrote these two classes CustomPane is the one that has the rotateImage() method.

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java Syntax (Toggle Plain Text)

//CustomPane.java
import javax.swing.* ;
import java.awt.* ;
import java.awt.image.* ;
 
public class CustomPane extends JPanel {
	String str ;
	BufferedImage original = new BufferedImage ( 200 , 50 ,
			BufferedImage.TYPE_INT_ARGB ) ;
	BufferedImage after ;
	double A = 0 ;
	double dA = 2 * Math.PI / 180 ;
 
	public CustomPane ( ) {
		this ( "Hello World" ) ;
	}
 
	public CustomPane ( String s ) {
		str = s ;
		Graphics g = original.getGraphics ( ) ;
		g.setColor ( new Color ( 0 , 0 , 0 , 1 ) ) ;
		g.fillRect ( 0 , 0 , original.getWidth ( ) , original.getHeight ( ) ) ;
		g.setColor ( new Color ( 0 , 0 , 0 , 255 ) ) ;
		g.drawString ( str , 10 , 10 ) ;
	}
 
	@ Override public void paint ( Graphics g ) {
		A += dA ;
		if ( A >= Math.PI/2 ) {
			A -= Math.PI/2 ;
		}
		g.setColor(new Color(255,255,255));
		after = rotateImage ( original , A );
		g.fillRect ( 0 , 0 , original.getWidth ( ) , after.getHeight ( ) ) ;
		g.drawImage (after  , 10 , 10 , null ) ;
	}
 
	public static BufferedImage rotateImage ( BufferedImage bi ,
			double angleRads ) {
		double cosA = Math.cos ( angleRads ) ;
		double sinA = Math.sin ( angleRads ) ;
		BufferedImage nbi = new BufferedImage ( ( int ) Math.abs ( ( bi
				.getWidth ( )
				* cosA + bi.getHeight ( ) * sinA ) ) , ( int ) Math.abs ( ( bi
				.getHeight ( )
				* cosA + bi.getWidth ( ) * sinA ) ) ,
				BufferedImage.TYPE_INT_ARGB ) ;
		Graphics g = nbi.getGraphics ( ) ;
		g.setColor ( new Color ( 0 , 0 , 0 , 0 ) ) ;
		g.fillRect ( 0 , 0 , nbi.getWidth ( ) , nbi.getHeight ( ) ) ;
		for ( int x = 0 ; x < nbi.getWidth ( ) ; x ++ ) {
			for ( int y = 0 ; y < nbi.getHeight ( ) ; y ++ ) {
				try {
					nbi.setRGB ( ( int ) x , ( int ) y , bi.getRGB (
							( int ) ( x * cosA + y * sinA ) , ( int ) ( y
									* cosA - x * sinA ) ) ) ;
				} catch ( Exception e ) {}
			}
		}
		return nbi ;
	}
}

//CustomPane.java import javax.swing.* ; import java.awt.* ; import java.awt.image.* ; public class CustomPane extends JPanel { String str ; BufferedImage original = new BufferedImage ( 200 , 50 , BufferedImage.TYPE_INT_ARGB ) ; BufferedImage after ; double A = 0 ; double dA = 2 * Math.PI / 180 ; public CustomPane ( ) { this ( "Hello World" ) ; } public CustomPane ( String s ) { str = s ; Graphics g = original.getGraphics ( ) ; g.setColor ( new Color ( 0 , 0 , 0 , 1 ) ) ; g.fillRect ( 0 , 0 , original.getWidth ( ) , original.getHeight ( ) ) ; g.setColor ( new Color ( 0 , 0 , 0 , 255 ) ) ; g.drawString ( str , 10 , 10 ) ; } @ Override public void paint ( Graphics g ) { A += dA ; if ( A >= Math.PI/2 ) { A -= Math.PI/2 ; } g.setColor(new Color(255,255,255)); after = rotateImage ( original , A ); g.fillRect ( 0 , 0 , original.getWidth ( ) , after.getHeight ( ) ) ; g.drawImage (after , 10 , 10 , null ) ; } public static BufferedImage rotateImage ( BufferedImage bi , double angleRads ) { double cosA = Math.cos ( angleRads ) ; double sinA = Math.sin ( angleRads ) ; BufferedImage nbi = new BufferedImage ( ( int ) Math.abs ( ( bi .getWidth ( ) * cosA + bi.getHeight ( ) * sinA ) ) , ( int ) Math.abs ( ( bi .getHeight ( ) * cosA + bi.getWidth ( ) * sinA ) ) , BufferedImage.TYPE_INT_ARGB ) ; Graphics g = nbi.getGraphics ( ) ; g.setColor ( new Color ( 0 , 0 , 0 , 0 ) ) ; g.fillRect ( 0 , 0 , nbi.getWidth ( ) , nbi.getHeight ( ) ) ; for ( int x = 0 ; x < nbi.getWidth ( ) ; x ++ ) { for ( int y = 0 ; y < nbi.getHeight ( ) ; y ++ ) { try { nbi.setRGB ( ( int ) x , ( int ) y , bi.getRGB ( ( int ) ( x * cosA + y * sinA ) , ( int ) ( y * cosA - x * sinA ) ) ) ; } catch ( Exception e ) {} } } return nbi ; } }

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java Syntax (Toggle Plain Text)

//RotateText.java
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.concurrent.*;
public class RotateText extends JFrame implements Runnable
{
    CustomPane c = new CustomPane("This text will be rotated");
    public RotateText()
    {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(200,200);
        this.add(c);
        c.repaint();
        setVisible(true);
        ScheduledThreadPoolExecutor exec = new ScheduledThreadPoolExecutor(3);
        exec.scheduleAtFixedRate(this,0L,33L,TimeUnit.MILLISECONDS);
    }
    public static void main(String[] args){
        new RotateText();
    }
    public void run(){
        c.repaint();
    }
}

//RotateText.java import java.awt.*; import java.awt.event.*; import java.awt.geom.*; import javax.swing.*; import javax.swing.event.*; import java.util.concurrent.*; public class RotateText extends JFrame implements Runnable { CustomPane c = new CustomPane("This text will be rotated"); public RotateText() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setSize(200,200); this.add(c); c.repaint(); setVisible(true); ScheduledThreadPoolExecutor exec = new ScheduledThreadPoolExecutor(3); exec.scheduleAtFixedRate(this,0L,33L,TimeUnit.MILLISECONDS); } public static void main(String[] args){ new RotateText(); } public void run(){ c.repaint(); } }

this example is of an animated rotating sentence, as i said this method is very slow, and inaccurate i hope that it is clear what i did. mostly basic trig.