Develop Reference

Any better way to draw string with outline in Java?

I need to draw white text with black outline on a Graphics object I get from an image. I first draw the same text 4 times (moved left or right by one pixel) with black color and then once with white color. However this won't work well if outline needs to be more than 1px wide, and really seems like a hack. Is there a better way to do this?
final BufferedImage image = ImageIO.read(new File("./test.jpg"));
Graphics g = image.getGraphics();
g.setFont(g.getFont().deriveFont(45F));
// coordinates
int x = 100;
int y = 100;
String text = "Hello world";
g.setColor(Color.black);
g.drawString(text, x + 1, y - 1);
g.drawString(text, x + 1, y + 1);
g.drawString(text, x - 1, y - 1);
g.drawString(text, x - 1, y + 1);
g.setColor(Color.white);
g.drawString(text, x, y);
screenshot: https://i.imgur.com/ONLsPxy.png

The other option is to use below piece of code of creating a shape and then first drawing outline and then fill it:
Graphics2D g2d = (Graphics2D)g;
AffineTransform transform = g2d.getTransform();
transform.translate(x, y);
g2d.transform(transform);
g2d.setColor(Color.black);
FontRenderContext frc = g2d.getFontRenderContext();
TextLayout tl = new TextLayout(text, g.getFont().deriveFont(45F), frc);
Shape shape = tl.getOutline(null);
g2d.setStroke(new BasicStroke(5f));
g2d.draw(shape);
g2d.setColor(Color.white);
g2d.fill(shape);
Output:

BufferedImage rotate and set with AffineTransform

I want to rotate and set a BufferedImage.Rotate operation is working with my code. However how can i set left margin and top margin
Graphics g = combined.getGraphics();
Graphics2D g2d = (Graphics2D) g;
AffineTransform at = new AffineTransform();
at.translate(overlay.getWidth() / 2, overlay.getHeight() / 2);
double d = Math.PI/2;
at.rotate(d);
at.translate(-overlay.getWidth()/2, -overlay.getHeight()/2);
g2d.drawImage(image, 0, 0, null);
g2d.drawImage(overlay, at, null);

Current Coordinate of bufferedImage Object in java

Is there anyway to find the current position of a buffered image on jpanel?
I draw an image on buffer, named it currentImage. Now I want to move it around a Panel by using affine transform.
To do translation by using mouse, I have to know the current position, new position and update the new position.
But I have trouble in getting the current position of the BufferedImage. There is no method in the IDE's suggestion working.
Can anyone give me an idea how to do this ?? Thanks!
EDIT
this is my draw and paintComponent method:
private void draw(){
AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.SRC);
int w = this.getWidth(); int h = this.getHeight();
if (currentImage == null || width != w || height != h){
width = w;
height = h;
currentImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
graphics = currentImage.createGraphics();
graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_GASP);
drawClearAndGradedArea(graphics);
drawActualRunway(graphics, width, height, width, height);
drawLeftToRight(graphics);
drawRightToLeft(graphics);
drawCentralLine(graphics);
graphics.setComposite(ac);
}
}
paintComponent()
#Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.clearRect(0,0, this.getWidth(), this.getHeight());
RenderingHints rh = new RenderingHints(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2d.setRenderingHints(rh);
g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_GASP);
/*
* main components on panel
*/
this.draw();
this.animation();
g2d.drawImage(currentImage, transform, this);
drawNote(g2d);
g2d.dispose();
}

Writing String into a image in java

I am trying to write a string into a image using ImageIo. But while writing a large string ,full string is not written into that image.
Here's my code:
File url=new File(imgUrl);
BufferedImage image = ImageIO.read(url);
Graphics g = image.getGraphics();
g.setPaintMode();
g.setFont(g.getFont().deriveFont(30f));
g.drawString(text, 100, 100);
g.dispose();
This code works fine for small strings.but when the width of the string exceeds the width of the image,then full string is not displayed on that image.
Any suggestions?

i have an old method try it
public BufferedImage stringToImage(String text, Font font, Color bgColor, Color fgColor) {
BufferedImage image = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = (Graphics2D) image.getGraphics();
g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
FontRenderContext fc = g2d.getFontRenderContext();
Rectangle2D bounds = font.getStringBounds(text, fc);
//calculate the size of the text
int width = (int) bounds.getWidth();
int height = (int) bounds.getHeight();
image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
g2d = (Graphics2D) image.getGraphics();
g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setFont(font);
g2d.setColor(bgColor);
g2d.fillRect(0, 0, width, height);
g2d.setColor(fgColor);
g2d.drawString(text, 0, (int)-bounds.getY());
g2d.dispose();
return image;
}
and use
BufferedImage image = stringToImage(text, font, bgColor, fgColor);
ImageIO.write(image, "jpg", file);

Not tested, but it could be done as this:
JLabel label = new JLabel("<html><h2>Title</h2><p>large text ...</p>");
int w = image.getWidth();
int h = image.getHeigth();
label.setBounds(0, 0, w, h);
SwingUtilities.paintComponent(g, label, null, 0, 0, w, h);

There are many ways to acheive this.
FontRenderContext/GlyphVector as mentioned by pbaris. See this answer for an e.g.
FontMetrics as seen in this answer.
A JLabel (possibly multi-line) to contain and size the text. As mentioned by Joop E.G. LabelRenderTest

You can use JTextArea to layout text:
JTextArea textArea = new JTextArea(text);
textArea.setFont(g.getFont().deriveFont(30f));
textArea.setOpaque(false);
textArea.setWrapStyleWord(true);
textArea.setLineWrap(true);
textArea.setBounds(0, 0, image.getWidth(), image.getHeight());
textArea.paint(g);

Draw rectangle border thickness

Is it possible to do draw a rectangle with a given border thickness in an easy way?

If you are drawing on a Graphics2D object, you can use the setStroke() method:
Graphics2D g2;
double thickness = 2;
Stroke oldStroke = g2.getStroke();
g2.setStroke(new BasicStroke(thickness));
g2.drawRect(x, y, width, height);
g2.setStroke(oldStroke);
If this is being done on a Swing component and you are being passed a Graphics object, you can downcast it to a Graphics2D.
Graphics2D g2 = (Graphics2D) g;

Here's how to do this : Border with colored line with thickness 5.
Border linebor = BorderFactory.createLineBorder(new Color(0xAD85FF), 5);

**Tested code with buffered image with different thickness values**:
Graphics2D g = bufferedImage.createGraphics();
int height = //image height
int width = //image height
int borderWidth = //border thickness
int borderControl = 1;
//set border color
g.setColor(Color.BLACK);
//set border thickness
g.setStroke(new BasicStroke(borderWidth));
//to fix issue for even numbers
if(borderWidth%2 == 0){
borderControl = 0;
}
g.drawLine(0, 0, 0, height);
g.drawLine(0, 0, width, 0);
g.drawLine(0, height – borderControl, width, height – borderControl);
g.drawLine(width – borderControl, height – borderControl, width – borderControl, 0);