用java在图像上绘制文本

Question

I am trying t draw different things over an image, in the first case works well, but I don t know how to deal with the second case: first case: second case:

As you can see the path is larger. This is the code for drawing text:

public void paintComponent(Graphics g) {
        super.paintComponent(g);
        g = g.create();
        g.setColor(Color.WHITE);
        g.setFont(getFont().deriveFont(24f));
        g.fillRect(0, 0, getWidth(), getHeight());

        int margin = 1;

        g.drawImage( this.image, margin, margin, this.image.getWidth(), this.image.getHeight(), this);
        g.setColor(Color.RED);
        int i=0;

       if(name1!=null) {
            g.drawString(name1, 50, 50);
            if(i==0) {
                i = i + 40;
            }
        }
        if(path!=null) {
            g.drawString(path, 40, 50 + i);

                i = i + 40;

            }
        if(size!=null){
            g.drawString(size,50,50+i);
                i = i + 40;

        }
        if(dimention!=null){
            g.drawString(dimention,50,50+i);
                i = i + 40;
        }
        if(date!=null){
            g.drawString(date, 50,50+i);

        }
    }

Answer 1

If you want to use AWT only, then use Graphics.getFontMetrics (optionally specifying the font if it is not a standard font) to get a FontMetrics, and then FontMetrics.stringWidth to get the width for the specified string.

For example, if you have a graphics variable named g, use:

int width = g.getFontMetrics().stringWidth(text);

You have to calculate how big the string is to cut it off at the appropriate place.

String myText = "mylongtempstringformeasuring"; // The string to check.
int maxWidth = 1000; // The width of the image.
String tempString = myText;
int i = 0;
while (g.getFontMetrics().stringWidth(tempString) >= maxWidth) {
  i++;
  tempString = tempString.substring(0, tempString.length() - i);
}

String remainText = tempString.substring(tempString.length() - 1, myText.length() - 1);

After that you know after how many characters (variable i) you have to truncate the string. After that you can do the same for the remain of the text. It's best to do the whole thing in a loop, too.