Clicking on a text node char

Scripting Issues
1

Is it possible to know exactly what character has been clicked inside a text node? Can we know, for instance, the offset of the character that was under the mouse and it’s bounding box inside the text node?

2

Well, it’s not easy, but you can get the point of intersection in 2-d coordinates, and from that you can determine which row and column was clicked. If nothing else, you can iterate through all of the rows and columsn and call textNode.get_xpos(r, c) and textNode.get_ypos(r, c) until you find the closest match.

But if you use a little smarts, you can probably come up with a better system than that.

David

3

I can’t find a get_xpos or get_ypos in the TextNode class reference. Maybe this method has changed or renamed recently?

4

You’re right, my mistake. These are methods of TextAssembler, which the TextNode uses internally to lay out its text. I don’t know why TextAssembler doesn’t appear in the generated docs, but here’s a quick example of its use.

tn = TextNode('tn')
tn.setText('abcdef\nghi')
ta = TextAssembler(tn)
ta.setWtext(tn.getWtext())
for ri in range(ta.getNumRows()):
  for ci in range(ta.getNumCols(ri)):
    print "ri = %s, ci = %s, char = %s, pos = %s, %s" % (ri, ci, chr(ta.getCharacter(ri, ci)), ta.getXpos(ri, ci), ta.getYpos(ri, ci))

David

5

Thanks.