iText- ColumnText set text fit size in Rectangle
Solution 1
The main issue
The main issue is that you use the wrong arguments in ct.setSimpleColumn
:
ct.setSimpleColumn(10, 10, rectWidth , 70);
In contrast to the later cb.rectangle
call
cb.rectangle(10, 10, rectWidth , 70);
which has arguments float x, float y, float w, float h
(w
and h
being width and height) the method ct.setSimpleColumn
has arguments float llx, float lly, float urx, float ury
(ll being lower left and ur being upper right). Thus your ct.setSimpleColumn
should look like this:
ct.setSimpleColumn(10, 10, 10 + rectWidth, 10 + 70);
A side issue
In addition to the main issue your result font size is 0.1 too large; essentially this is an error already pointed out by @David.
Your main loop in your getMaxFontSize
method is this:
while(measureWidth < width){
measureWidth = bf.getWidthPoint(text, fontSize);
oldSize = fontSize;
fontSize += 0.1f;
}
This essentially results in oldSize
(which eventually is returned) being the first font size which does not fit. You could fix this by instead using
while(bf.getWidthPoint(text, fontSize) < width){
oldSize = fontSize;
fontSize += 0.1f;
}
Even better would be an approach only calculating the string width once, not using a loop at all, e.g.
private static float getMaxFontSize(BaseFont bf, String text, int width)
{
int textWidth = bf.getWidth(text);
return (1000 * width) / textWidth;
}
(This method uses integer arithmetic. If you insist on an exact fit, switch to float or double arithmetic.)
Solution 2
There are two bugs here, both in
while(measureWidth < width){
measureWidth = bf.getWidthPoint(text, fontSize++);
}
- You're staying in the loop until
measureWidth >= width
- in other words, by the time you escape from thewhile
loop,measureWidth
is already too big for the rectangle. - You're doing
fontSize++
, which means that after you've usedfontSize
to calculatemeasureWidth
, you're increasing it. When you do get round to returning it, it's one more than the value you just tested. So the return value from the method will be one more than the last value that you tested (which, due to point 1., was already too big).
ductran
Doing what you like is freedom, liking what you do is happiness
Updated on June 09, 2022Comments
-
ductran about 2 years
I want to add text into a rectangle(x,y,w,h). Text should be fitted size of rectangle (mean it has a maximum size but it still contains in rectangle).
I tried to measure the text size base onBaseFont.getWidthPoint()
The problem is the final text size can't fit the rect. It looks like this:
Here is my try:
PdfContentByte cb = writer.getDirectContent(); cb.saveState(); ColumnText ct = new ColumnText(writer.getDirectContent()); Font font = new Font(BaseFont.createFont()); int rectWidth = 80; float maxFontSize = getMaxFontSize(BaseFont.createFont(), "text", rectWidth ); font.setSize(maxFontSize); ct.setText(new Phrase("test", font)); ct.setSimpleColumn(10, 10, rectWidth , 70); ct.go(); // draw the rect cb.setColorStroke(BaseColor.BLUE); cb.rectangle(10, 10, rectWidth , 70); cb.stroke(); cb.restoreState(); // get max font size base on rect width private static float getMaxFontSize(BaseFont bf, String text, int width){ float measureWidth = 1; float fontSize = 0.1f; float oldSize = 0.1f; while(measureWidth < width){ measureWidth = bf.getWidthPoint(text, fontSize); oldSize = fontSize; fontSize += 0.1f; } return oldSize; }
Could you please tell me where I am wrong?
Another problem, I want to measure for both width and height, which text completely contains in rectangle and has the maximum font size. Is there any way to do this?
Update: here is the complete source code that worked for me:
private static float getMaxFontSize(BaseFont bf, String text, int width, int height){ // avoid infinite loop when text is empty if(TextUtils.isEmpty(text)){ return 0.0f; } float fontSize = 0.1f; while(bf.getWidthPoint(text, fontSize) < width){ fontSize += 0.1f; } float maxHeight = measureHeight(bf, text, fontSize); while(maxHeight > height){ fontSize -= 0.1f; maxHeight = measureHeight(bf, text, fontSize); }; return fontSize; } public static float measureHeight(BaseFont baseFont, String text, float fontSize) { float ascend = baseFont.getAscentPoint(text, fontSize); float descend = baseFont.getDescentPoint(text, fontSize); return ascend - descend; }