Calculate width and Height of a Text

[nazilabdulla]

Is it Possible to calculate width and Height of Text in Turtle,
If We have following parameters
1. TextSize
2. Pensize
3. String Length (Number Char in Text)

 

[Erel]

Turtle.DrawText measures the text height in order to vertically center it.

You can create a B4XCanvas in your code and use it to measure the text dimensions. What are you trying to do?

 

[nazilabdulla]

Let you know what is my requirement,
I have one Text, That will draw in Turtle,
Next Step , I need to Highlight particular section of above Text..
Highlighting means ….
Under line particular area of text
Or
Circle on particular area of Text
Or
Put Arrow or some other Drawing on particular area of text

My Logic is to calculate text width and find the location of particular text.

 

[Erel]

Example of drawing text with underline:

'globals:
Private cvs As B4XCanvas
    Private fnt As B4XFont

Sub Turtle_Start
    If cvs.TargetRect = Null Then
        Dim p As B4XView = xui.CreatePanel("")
        p.SetLayoutAnimated(0, 0, 0, 2dip, 2dip)
        cvs.Initialize(p)
        fnt = xui.CreateDefaultFont(20)
    End If
    Turtle.SetSpeedFactor(1).SetPenColor(xui.Color_Blue).SetPenSize(1)
    Turtle.SetFontAndAlignment(fnt, "LEFT")
   
   DrawUnderlineText("Asdasd asdasd")
   Turtle.SetAngle(90).PenUp.MoveForward(25).PenDown
    DrawUnderlineText("Second line")
End Sub

Sub DrawUnderlineText(s As String)
    Dim r As B4XRect = cvs.MeasureText(s, fnt)
    Turtle.PushState
    Turtle.DrawText(s)
    Turtle.PopState
    Turtle.PushState
    Turtle.PenUp.SetAngle(90).MoveForward(r.Height / 2 / xui.Scale + 3).PenDown
    Turtle.SetAngle(0).MoveForward(r.Width / xui.Scale)
    Turtle.PopState
End Sub

 

[agraham]

Why the mismatched Push/Pops in DrawUnderLineText?

 

[Erel]

Count carefully. 2 pushes and 2 pops.

We draw the text and return to the initial position.
We draw the line and we again return to the initial position.

Edit: There is of course no problem to move the second Push to be after the first Pop. I will change it as it is more clear.