Develop Reference

BasicTabbedPaneUI showing border when focused

I am trying to make a custom TabbedPaneUI by extending BasicTabbedPaneUI
I am having an issue with setting the TextColor, When ever I set the TextColor it shows a border when the pane is focused and enabled.
as you can see the pane that has the title Test is enabled/selected Pane and it has a white border around it and I do not want the border. I have already overrided paintTabBorder
#Override
protected void paintTabBorder(Graphics g, int tabPlacement, int tabIndex, int x, int y, int w, int h, boolean isSelected) {
//We do nothing here to disable painting the Tab Border
}
here is how I am overriding paintText to change the Text Color
#Override
protected void paintText(Graphics g, int tabPlacement, Font font, FontMetrics metrics, int tabIndex, String title, Rectangle textRect, boolean isSelected) {
g.setFont(font);
View v = getTextViewForTab(tabIndex);
if (v != null) {
// html
v.paint(g, textRect);
} else {
// plain text
int mnemIndex = tabPane.getDisplayedMnemonicIndexAt(tabIndex);
if (tabPane.isEnabled() && tabPane.isEnabledAt(tabIndex)) {
//Change the text to White here <- Causing Border Issues
g.setColor(Color.WHITE);
SwingUtilities2.drawStringUnderlineCharAt(tabPane, g,
title, mnemIndex,
textRect.x, textRect.y + metrics.getAscent());
} else { // tab disabled
g.setColor(tabPane.getBackgroundAt(tabIndex).brighter());
SwingUtilities2.drawStringUnderlineCharAt(tabPane, g,
title, mnemIndex,
textRect.x, textRect.y + metrics.getAscent());
g.setColor(tabPane.getBackgroundAt(tabIndex).darker());
SwingUtilities2.drawStringUnderlineCharAt(tabPane, g,
title, mnemIndex,
textRect.x - 1, textRect.y + metrics.getAscent() - 1);
}
}
}
g.setColor(Color.WHITE); is causing the border issue, I have confirmed this by setting the Color to something else rather then White and the border was also that color aswell as the Text.

Just draw another empty title with the background color to effectively hide the border.
#Override
protected void paintText(Graphics g, int tabPlacement, Font font, FontMetrics metrics, int tabIndex, String title, Rectangle textRect, boolean isSelected) {
g.setFont(font);
View v = getTextViewForTab(tabIndex);
if (v != null) {
// html
v.paint(g, textRect);
} else {
// plain text
int mnemIndex = tabPane.getDisplayedMnemonicIndexAt(tabIndex);
if (tabPane.isEnabled() && tabPane.isEnabledAt(tabIndex)) {
//Change the text to White here
g.setColor(Color.WHITE);
SwingUtilities2.drawStringUnderlineCharAt(tabPane, g,
title, mnemIndex,
textRect.x, textRect.y + metrics.getAscent());
//Remove Border Issues
g.setColor(tabPane.getBackgroundAt(tabIndex).darker());
SwingUtilities2.drawStringUnderlineCharAt(tabPane, g,
"", mnemIndex, //<-- empty title here
textRect.x, textRect.y + metrics.getAscent());
} else { // tab disabled
g.setColor(tabPane.getBackgroundAt(tabIndex).brighter());
SwingUtilities2.drawStringUnderlineCharAt(tabPane, g,
title, mnemIndex,
textRect.x, textRect.y + metrics.getAscent());
g.setColor(tabPane.getBackgroundAt(tabIndex).darker());
SwingUtilities2.drawStringUnderlineCharAt(tabPane, g,
title, mnemIndex,
textRect.x - 1, textRect.y + metrics.getAscent() - 1);
}
}
}

After a bit of research, I have figured out how to fix the border issue I had to set the graphics color after drawing the String. g.setColor(selectColor);
//Change the text to White here <- Causing Border Issues
g.setColor(Color.WHITE);
SwingUtilities2.drawStringUnderlineCharAt(tabPane, g,
title, mnemIndex,
textRect.x, textRect.y + metrics.getAscent());
//reset the color to selectedColor
g.setColor(selectColor);

Java PrintJob to DocPrintJob Not Working?

I have a class that extends from Printable, it prints fine using the standard PrintJob, but i would like to move to DocPrintJob so i can listen to the status of the print (successful print etc).
My current code looks like this to create a print job and print
// define printer
AttributeSet attributes = new HashAttributeSet();
attributes.add(new Copies(1));
// get printerJob
PrinterJob printJob = PrinterJob.getPrinterJob();
PageFormat pageFormat = printJob.defaultPage();
// sizing (standard is 72dpi, so multiple inches by this)
Double height = 8d * 72d;
Double width = 3d * 72d;
Double margin = 0.1d * 72d;
// set page size
Paper paper = pageFormat.getPaper();
paper.setSize(width, height);
paper.setImageableArea(margin, margin, width - (margin * 2), height - (margin * 2));
// set orientation and paper
pageFormat.setOrientation(PageFormat.PORTRAIT);
pageFormat.setPaper(paper);
// create a book for printing
Book book = new Book();
book.append(new EventPrint(args.getEvent()), pageFormat);
// set book to what we are printing
printJob.setPageable(book);
// set print request attributes
PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
aset.add(OrientationRequested.PORTRAIT);
// now print
try {
printJob.print();
} catch (PrinterException e) {
e.printStackTrace();
}
Now to convert this to a DocPrintJob, i followed this link which told me how to convert from PrintJob to DocPrintJob. So now my code became this
PrintService[] services = PrinterJob.lookupPrintServices(); //list of printers
PrintService printService = services[0];
DocFlavor[] flavours = printService.getSupportedDocFlavors();
// may need to determine which printer to use
DocPrintJob printJob = printService.createPrintJob();
// get out printable
EventPrint eventPrint = new EventPrint(args.getEvent());
// convert printable to doc
Doc doc = new SimpleDoc(eventPrint, DocFlavor.SERVICE_FORMATTED.PRINTABLE, null);
// add eventlistener to printJob
printJob.addPrintJobListener(new PrintJobListener() {
#Override
public void printDataTransferCompleted(PrintJobEvent pje) {
Console.Log("Print data sent successfully");
}
#Override
public void printJobCompleted(PrintJobEvent pje) {
Console.Log("Print successful");
}
#Override
public void printJobFailed(PrintJobEvent pje) {
Console.Log("Print failed");
}
#Override
public void printJobCanceled(PrintJobEvent pje) {
Console.Log("Print cancelled");
}
#Override
public void printJobNoMoreEvents(PrintJobEvent pje) {
Console.Log("No more printJob events");
}
#Override
public void printJobRequiresAttention(PrintJobEvent pje) {
Console.Log("printJob requires attention");
}
});
PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
aset.add(new Copies(1));
try {
printJob.print(doc, aset);
} catch (Exception e) {
}
Now for some reason, my print just keeps executing (400+ times until i close application). I am not sure if it is because maybe i have not set the paper size, like i did when i was using PrintJob? Would that cause it? If so, how can i set the paperSize of the DocPrintJob as it doesnt have the methods the normal printJob has?
Anyone else faces this problem before?
EDIT: Here is my eventPrint class and the class it inherits from
PRINTABLEBASE.JAVA
public class PrintableBase {
public Graphics2D g2d;
public float x, y, imageHeight, imageWidth, maxY;
public enum Alignment { LEFT, RIGHT, CENTER };
public void printSetup(Graphics graphics, PageFormat pageFormat) {
// user (0,0) is typically outside the imageable area, so we must translate
// by the X and Y values in the pageFormat to avoid clipping
g2d = (Graphics2D) graphics;
g2d.translate(pageFormat.getImageableX(), pageFormat.getImageableY());
// get starter X and Y
x = 0;//(float)pageFormat.getImageableX();
// do not offset vertical as pushes ticket down too much
y = 0;//(float)pageFormat.getImageableY();
// get height and width of the printable image
imageWidth = (float)pageFormat.getImageableWidth();
imageHeight = (float)pageFormat.getImageableHeight();
// maximum that we can go vertically
maxY = y;
Console.Log("imageWidth:" + imageWidth);
Console.Log("imageHeight: " + imageHeight);
Console.Log("X: " + x);
Console.Log("Y: " + y);
}
public void setFont(Font font) {
g2d.setFont(font);
}
public float addSeparatorLine(float y, float imageWidth) {
String fontName = g2d.getFont().getName();
int fontStyle = g2d.getFont().getStyle();
int fontSize = g2d.getFont().getSize();
g2d.setFont(new Font("Arial", Font.PLAIN, 10));
y = drawFirstLine(g2d, "---------------------------------------------------------------------------------------", imageWidth, 0, y, Alignment.LEFT);
// revery font
g2d.setFont(new Font(fontName, fontStyle, fontSize));
return y + 5;
}
public BufferedImage scaleImage(BufferedImage sbi, int dWidth, int dHeight) {
BufferedImage dbi = null;
if(sbi != null) {
// calculate ratio between standard size and scaled
double wRatio = (double)dWidth / (double)sbi.getWidth();
double hRatio = (double)dHeight / (double)sbi.getHeight();
// use wRatio by default
double sWidth = (double)sbi.getWidth() * wRatio;
double sHeight = (double)sbi.getHeight() * wRatio;
// if hRation is small, use that, as image will be reduced by more
if (hRatio < wRatio) {
sWidth = (double)sbi.getWidth() * hRatio;
sHeight = (double)sbi.getHeight() * hRatio;
}
double sRatio = (wRatio < hRatio) ? wRatio : hRatio;
// now create graphic, of new size
dbi = new BufferedImage((int)sWidth, (int)sHeight, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = dbi.createGraphics();
AffineTransform at = AffineTransform.getScaleInstance(sRatio, sRatio);
g.drawRenderedImage(sbi, at);
}
return dbi;
}
// This function will only add the first line of text and will not wrap
// useful for adding the ticket title.
// Returns the height of the text
public float drawFirstLine(Graphics2D g2, String text, float width, float x, float y, Alignment alignment) {
AttributedString attstring = new AttributedString(text);
attstring.addAttribute(TextAttribute.FONT, g2.getFont());
AttributedCharacterIterator paragraph = attstring.getIterator();
int paragraphStart = paragraph.getBeginIndex();
int paragraphEnd = paragraph.getEndIndex();
FontRenderContext frc = g2.getFontRenderContext();
LineBreakMeasurer lineMeasurer = new LineBreakMeasurer(paragraph, frc);
// Set break width to width of Component.
float breakWidth = width;
float drawPosY = y;
// Set position to the index of the first character in the paragraph.
lineMeasurer.setPosition(paragraphStart);
// Get lines until the entire paragraph has been displayed.
if (lineMeasurer.getPosition() < paragraphEnd) {
// Retrieve next layout. A cleverer program would also cache
// these layouts until the component is re-sized.
TextLayout layout = lineMeasurer.nextLayout(breakWidth);
// Compute pen x position.
float drawPosX;
switch (alignment){
case RIGHT:
drawPosX = (float) x + breakWidth - layout.getAdvance();
break;
case CENTER:
drawPosX = (float) x + (breakWidth - layout.getAdvance())/2;
break;
default:
drawPosX = (float) x;
}
// Move y-coordinate by the ascent of the layout.
drawPosY += layout.getAscent();
// Draw the TextLayout at (drawPosX, drawPosY).
layout.draw(g2, drawPosX, drawPosY);
// Move y-coordinate in preparation for next layout.
drawPosY += layout.getDescent() + layout.getLeading();
}
return drawPosY;
}
/**
* Draw paragraph.
*
* #param g2 Drawing graphic.
* #param text String to draw.
* #param width Paragraph's desired width.
* #param x Start paragraph's X-Position.
* #param y Start paragraph's Y-Position.
* #param dir Paragraph's alignment.
* #return Next line Y-position to write to.
*/
protected float drawParagraph (String text, float width, float x, float y, Alignment alignment){
AttributedString attstring = new AttributedString(text);
attstring.addAttribute(TextAttribute.FONT, g2d.getFont());
AttributedCharacterIterator paragraph = attstring.getIterator();
int paragraphStart = paragraph.getBeginIndex();
int paragraphEnd = paragraph.getEndIndex();
FontRenderContext frc = g2d.getFontRenderContext();
LineBreakMeasurer lineMeasurer = new LineBreakMeasurer(paragraph, frc);
// Set break width to width of Component.
float breakWidth = width;
float drawPosY = y;
// Set position to the index of the first character in the paragraph.
lineMeasurer.setPosition(paragraphStart);
// Get lines until the entire paragraph has been displayed.
while (lineMeasurer.getPosition() < paragraphEnd) {
// Retrieve next layout. A cleverer program would also cache
// these layouts until the component is re-sized.
TextLayout layout = lineMeasurer.nextLayout(breakWidth);
// Compute pen x position.
float drawPosX;
switch (alignment){
case RIGHT:
drawPosX = (float) x + breakWidth - layout.getAdvance();
break;
case CENTER:
drawPosX = (float) x + (breakWidth - layout.getAdvance())/2;
break;
default:
drawPosX = (float) x;
}
// Move y-coordinate by the ascent of the layout.
drawPosY += layout.getAscent();
// Draw the TextLayout at (drawPosX, drawPosY).
layout.draw(g2d, drawPosX, drawPosY);
// Move y-coordinate in preparation for next layout.
drawPosY += layout.getDescent() + layout.getLeading();
}
return drawPosY;
}
}
EVENTPRINT.JAVA
public class EventPrint extends PrintableBase implements Printable {
private Event event;
public EventPrint(Event event) {
this.event = event;
}
#Override
public int print(Graphics graphics, PageFormat pageFormat, int pageIndex)
throws PrinterException {
// setup
super.printSetup(graphics, pageFormat);
// title
super.setFont(new Font("Tahoma", Font.BOLD, 16));
y = super.drawParagraph(event.getTitle(), imageWidth, x, y, Alignment.LEFT);
RETURN PAGE_EXISTS;
}

I would say that your problem is that you never tell the API that there are no more pages....
public int print(Graphics graphics, PageFormat pageFormat, int pageIndex)
throws PrinterException {
// setup
super.printSetup(graphics, pageFormat);
// title
super.setFont(new Font("Tahoma", Font.BOLD, 16));
y = super.drawParagraph(event.getTitle(), imageWidth, x, y, Alignment.LEFT);
RETURN PAGE_EXISTS;
}
So, assuming you only want to print a single page, you could use something like...
public int print(Graphics graphics, PageFormat pageFormat, int pageIndex)
throws PrinterException {
int result = NO_SUCH_PAGE;
if (pageIndex == 0) {
// setup
super.printSetup(graphics, pageFormat);
// title
super.setFont(new Font("Tahoma", Font.BOLD, 16));
y = super.drawParagraph(event.getTitle(), imageWidth, x, y, Alignment.LEFT);
result = PAGE_EXISTS;
}
RETURN result;
}
Otherwise the API doesn't know when to stop printing.
Bookable uses a different approach, in that each page of the book is only printed once and it will continue until all pages are printed. Printable is different, it will continue printing until you tell it to stop
Take a look at A Basic Printing Program for more details

I also encountered some issues when switching from PrinterJob to DocPrintJob. Your code seems fine to me, so maybe you are right with the page size. You can set the page size like this:
aset.add(new MediaPrintableArea(0, 0, width, height, MediaPrintableArea.MM));
But it depends on your printable object how to set this. I have created a bytearray (PDF) with iText and set the page size there. Then, I set the width and height in the above code to Integer.MAX_VALUE.
I can post my entire code when I get home. Hope it helps!

Combining two codes with a mousePressed-event processing

My problem is following:
I wrote a code and managed to display an image when i click on a rectangle (with the loadImage-fuction). The rectangle serves as a button that I want to replace with an image later.
But i actually don't just want an image to be displayed when the button is clicked. I want to call a code, to copy an image onto another:
public static int SQUARE_WIDTH = 30;
public static int SQUARE_HEIGHT = 30;
PImage img1,img2, img3;
void setup() {
size(670, 943);
img1 = loadImage("white.png");
img2 = loadImage("hase.jpg");
img3= loadImage("ohrring.jpg");
image(img1,0,0);
}
void draw() {
if(mousePressed)
copy(img2,
constrain(mouseX-SQUARE_WIDTH/2,0,width),
constrain(mouseY-SQUARE_HEIGHT/2,0,height),
SQUARE_WIDTH,SQUARE_HEIGHT,
constrain(mouseX-SQUARE_WIDTH/2,0,width),
constrain(mouseY-SQUARE_HEIGHT/2,0,height),
SQUARE_WIDTH,SQUARE_HEIGHT);
}
The copy-code doesn't simply copy an image, it uses the mouse as a brush! When you "draw" on an area, the image shows with the "strokes" of the brush pixel after pixel!
processing.org/reference/copy_.html
I happen to have huge problems when I want to combine this one with my main code:
int rectX, rectY;
int rectSize = 90;
boolean rectOver = false;
color rectHighlight;
color currentColor, baseColor;
color rectColor;
public static int SQUARE_WIDTH = 30;
public static int SQUARE_HEIGHT = 30;
PImage img1,img2, img3;
void setup() {
size(670, 943);
rectColor = color(0);
rectX = width/2-rectSize-10;
rectY = height/2-rectSize/2;
baseColor = color(102);
currentColor = baseColor;
img1 = loadImage("frida.jpg");
img2 = loadImage("hase.jpg");
img3 = loadImage("white.png");
background(img3);
}
void draw() {
update(mouseX, mouseY);
if (rectOver) {
fill(rectHighlight);
} else {
fill(rectColor);
}
stroke(255);
rect(rectX, rectY, rectSize, rectSize);
}
void update(int x, int y) {
if ( overRect(rectX, rectY, rectSize, rectSize) ) {
rectOver = true;
}else {
rectOver = false;
}
}
void mousePressed() {
if (rectOver) {
background(img2);
}
}
boolean overRect(int x, int y, int width, int height) {
if (mouseX >= x && mouseX <= x+width &&
mouseY >= y && mouseY <= y+height) {
return true;
} else {
return false;
}
}
Theoretically I got the tip to set a boolean in mousePressed() to do the copy-operation in draw(), and then to check this boolean in draw(): if set (true) it shall do the copy. But I'm unfortunately not the brightest star in the programming-sky , so could anybody show me what this part is supposed to look like? Of course, I'm open to other suggestions how to solve this problem!
Thank you!

I hope this is what you are looking for. If you want to copy an image you don't need to call a function to copy an image, you can simply invoke the = sign and the image will be copied.
In my example code buttonImage is the image on the button. Whenever you don't want an image on the button assign it the following way:
buttonImage = null;
If you want to have an image instead of the rectangle do the following:
buttonImage = yourImage;
buttonImage.resize(w, h); //fit it on the button.
I think this is what you want to achieve?
PImage buttonImage;
void setup()
{
}
void draw()
{
if(buttonImage == null || buttonImage.width < 2) rect(x, y, w, h);
else image(buttonImage, x, y);
}
void mouseReleased()
{
if(mouseX > x && mouseX < x + w && mouseY > y && mouseY < y + h)
{
//copy any image onto the buttonImage
buttonImage = loadImage("newPath.png"); //update / overwrite image
buttonImage.resize(w, h); //fit it on the button
}
}
x and y are the position of the button, w and h are the width and the height of the button in my example.
EDIT:
Ok, so basically you want to have a white background and you want to scrap it using your tool so an image appears? I'm still not 100% sure of what you're asking, but if that is the case try this:
I used img.get() instead of img.copy(), because it has less parameters to deal with. I really hoped i understood this correctly, if not maybe link a video to something similar? I have a hard time understanding what you want.
The toolSelected integer is a counter to which tool you are using. Depending on its value, it is executing a different code.
My code:
PImage img1;
int toolSelected = 0; //Normal tool;
int widthOfBrush = 20; //Now you are drawing 20x20
int buttonX = 200;
int buttonY = 200;
int buttonW = 40;
int buttonH = 20;
void setup()
{
size(640, 480);
background(255);
img1 = loadImage("yourImg.png");
img1.resize(width, height); //Fit it on processing screen
}
void draw()
{
if(toolSelected == 0) {}//other tool
//Instead of using copy we will be using buttonImage.get(x, y, w, h) --> makes more sense
if(toolSelected == 1 && mousePressed)
{
float yourX = mouseX;
float yourY = mouseY;
yourX -= floor(widthOfBrush / 2);
yourY -= floor(widthOfBrush / 2);
//scale & copy:
PImage brushImage = img1.get((int)yourX, (int)yourY, widthOfBrush * (width / img1.width), widthOfBrush * (width / img1.width)); //Draw the image at your destination
image(brushImage, mouseX, mouseY);
}
stroke(0);
fill(255);
rect(buttonX, buttonY, buttonW, buttonH);
}
void mouseReleased()
{
if (mouseX > buttonX && mouseX < buttonX + buttonW && mouseY > buttonY && mouseY < buttonY + buttonH)
{
//copy any image onto the buttonImage
//buttonImage = loadImage("newPath.png"); //update / overwrite image
toolSelected = 1; //Our tool is the image brush now.
}
}

RoundRectangle2D clip is not very smooth

I have a JPanel that i want to clip the corners so that it has rounded edge.
Here is what i am doing.
((Graphics2D)g).setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
g.setColor(color);
Shape s = new RoundRectangle2D.Double(0, 0, width, height, arc, arc);
g.setClip(s);
So notice that i am setting the clipping to a RoundRectangle2D. Also i am setting anti-aliasing still my rounded edges are really jagged.
Soft clipping example this link has a way to do soft rounded edges for a image. How do i apply the same to a JPanel?

because clipping is not aliased, you see the jagged edges. try a border instead:
p.setBorder(new RoundedBorder(p.getBackground(), 2, 16));
where RoundedBorder is adapted from the text bubble class:
class RoundedBorder extends AbstractBorder {
private Color color;
private int thickness = 4;
private int radii = 8;
private Insets insets = null;
private BasicStroke stroke = null;
private int strokePad;
private int pointerPad = 4;
RenderingHints hints;
RoundedBorder(
Color color, int thickness, int radii) {
this.thickness = thickness;
this.radii = radii;
this.color = color;
stroke = new BasicStroke(thickness);
strokePad = thickness / 2;
hints = new RenderingHints(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
int pad = radii + strokePad;
int bottomPad = pad + strokePad;
insets = new Insets(pad, pad, bottomPad, pad);
}
#Override
public Insets getBorderInsets(Component c) {
return insets;
}
#Override
public Insets getBorderInsets(Component c, Insets insets) {
return getBorderInsets(c);
}
#Override
public void paintBorder(
Component c,
Graphics g,
int x, int y,
int width, int height) {
Graphics2D g2 = (Graphics2D) g;
int bottomLineY = height - thickness;
RoundRectangle2D.Double bubble = new RoundRectangle2D.Double(
0 + strokePad,
0 + strokePad,
width - thickness,
bottomLineY,
radii,
radii);
Area area = new Area(bubble);
g2.setRenderingHints(hints);
Area spareSpace = new Area(new Rectangle(0, 0, width, height));
spareSpace.subtract(area);
g2.setClip(spareSpace);
g2.clearRect(0, 0, width, height);
g2.setClip(null);
g2.setColor(color);
g2.setStroke(stroke);
g2.draw(area);
}
}
}

If you want anti-aliased corners, use TexturePaint instead of clipping. It is the same as clipping, only faster. Use it with anti-alias on.
Just Google "TexturePaint examples".

How to output a String on multiple lines using Graphics

My Program overrides public void paint(Graphics g, int x, int y); in order to draw some stings using g.drawString(someString, x+10, y+30);
Now someString can be quite long and thus, it may not fit on one line.
What is the best way to write the text on multiple line. For instance, in a rectangle (x1, y1, x2, y2)?

Thanks to Epaga's hint and a couple of examples on the Net (not so obvious to find! I used mainly Break a Line for text layout), I could make a component to display wrapped text. It is incomplete, but at least it shows the intended effect.
class TextContainer extends JPanel
{
private int m_width;
private int m_height;
private String m_text;
private AttributedCharacterIterator m_iterator;
private int m_start;
private int m_end;
public TextContainer(String text, int width, int height)
{
m_text = text;
m_width = width;
m_height = height;
AttributedString styledText = new AttributedString(text);
m_iterator = styledText.getIterator();
m_start = m_iterator.getBeginIndex();
m_end = m_iterator.getEndIndex();
}
public String getText()
{
return m_text;
}
public Dimension getPreferredSize()
{
return new Dimension(m_width, m_height);
}
public void paint(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
FontRenderContext frc = g2.getFontRenderContext();
LineBreakMeasurer measurer = new LineBreakMeasurer(m_iterator, frc);
measurer.setPosition(m_start);
float x = 0, y = 0;
while (measurer.getPosition() < m_end)
{
TextLayout layout = measurer.nextLayout(m_width);
y += layout.getAscent();
float dx = layout.isLeftToRight() ?
0 : m_width - layout.getAdvance();
layout.draw(g2, x + dx, y);
y += layout.getDescent() + layout.getLeading();
}
}
}
Just for fun, I made it fitting a circle (alas, no justification, it seems):
public void paint(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
FontRenderContext frc = g2.getFontRenderContext();
LineBreakMeasurer measurer = new LineBreakMeasurer(m_iterator, frc);
measurer.setPosition(m_start);
float y = 0;
while (measurer.getPosition() < m_end)
{
double ix = Math.sqrt((m_width / 2 - y) * y);
float x = m_width / 2.0F - (float) ix;
int width = (int) ix * 2;
TextLayout layout = measurer.nextLayout(width);
y += layout.getAscent();
float dx = layout.isLeftToRight() ?
0 : width - layout.getAdvance();
layout.draw(g2, x + dx, y);
y += layout.getDescent() + layout.getLeading();
}
}
I am not too sure about dx computation, though.

java.awt.font.TextLayout might be helpful. Here's a snippet of their example code:
Graphics2D g = ...;
Point2D loc = ...;
Font font = Font.getFont("Helvetica-bold-italic");
FontRenderContext frc = g.getFontRenderContext();
TextLayout layout = new TextLayout("This is a string", font, frc);
layout.draw(g, (float)loc.getX(), (float)loc.getY());
Rectangle2D bounds = layout.getBounds();
bounds.setRect(bounds.getX()+loc.getX(),
bounds.getY()+loc.getY(),
bounds.getWidth(),
bounds.getHeight());
g.draw(bounds);
Otherwise you could always use a Swing text element to do the job for you, just pass in the Graphics you want it to paint into.

Incrementally build your string, one word at a time, using Epaga's method to find the length of your string. Once the length is longer than your rectangle, remove the last word and print. Repeat until you run out of words.
It sounds like a bad algorithm, but for each line, it's really O(screenWidth/averageCharacterWidth) => O(1).
Still, use a StringBuffer to build your string!

Had some trouble myself this is my solution:
Graphics2D g=....
FontRenderContext frc = g.getFontRenderContext();
TextLayout layout = new TextLayout(text, font, frc);
String[] outputs = text.split("\n");
for(int i=0; i<outputs.length; i++){
g.drawString(outputs[i], 15,(int) (15+i*layout.getBounds().getHeight()+0.5));
Hope that helps.... simple but it works.

You can use a JLabel and embed the text with html.
JLabel.setText("<html>"+line1+"<br>"+line2);