Centering text on a bitmap?

thedeftone · by **thedeftone** » Sun Jun 01, 2008 2:53 pm

Hi

is there an easy way to center a text vertically and horizontally on a bitmap?
I tried to calculate the xPosition and the yPosition of the text, but i can't figure out who the center the text vertically.

This is how i centered the text horizontally:

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Using java Syntax Highlighting

// Here we calculate the xPos of the text with the help of getTextWidths()
 
// which gives us the width in px of a certain text
 
int textXPos = (size-paintText.getTextWidths(value, new float[1]) ) / 2;
 
int textYPos = ????? ;
 
// draw Text
 
canvas.drawText(value, textXPos, textYPos, paintText);
Parsed in 0.030 seconds,  using GeSHi 1.0.8.4

size is the height and also the width of the canvas...

I think it could help a lot to get the height of the text in px but I don't get it...

greetz

thedeftone · by **thedeftone** » Sun Jun 01, 2008 3:28 pm

So the width is workin perfect now I think but i keep having troubles with the height.
I just found an older topic where a similar problem was discussed: This topic

Use Paint.ascent() and Paint.descent() to compute the height.

Can someone explain this to me? I'm not sure what ascent and descent means and how to calculate the height with this information.

greets

thedeftone · by **thedeftone** » Tue Jun 03, 2008 8:40 am

I've been searching desperately for a solution...can anybody help me out? :cry:

cheneysan · by **cheneysan** » Thu Jul 03, 2008 12:25 pm

You could try FontMetrics top and bottom attributes. :?:

cg0601 · by **cg0601** » Thu Aug 06, 2009 6:57 am

If you draw on a Canvas, you can use the text attributes of your paint:

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       textPaint.setTextAlign(Paint.Align.CENTER);
 
Parsed in 0.030 seconds,  using GeSHi 1.0.8.4

There is a good example in the ApiDemos project in the SDK. Look for the class TextAlign.java in the com.example.android.apis.graphics package

Centering text on a bitmap?

Centering text on a bitmap?

TextAlign example in the SDK

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