B4J Question How to render text to images?

xulihang · Oct 16, 2021

Hi there,

I want to get the image of a single character like "我" and "？".

I tried using B4XCanvas's MeasureText and Canvas's drawText:

B4X:

Dim emptyPane As Pane
emptyPane.Initialize("")
Dim cvs1 As B4XCanvas
cvs1.Initialize(emptyPane)
Dim r As B4XRect=cvs1.MeasureText(s,f)
Dim width,height As Double
width=r.Width
height=r.Height
Dim X,Y As Double
X=0
Y=height
Dim Canvas1 As Canvas
Canvas1.Initialize("")
Canvas1.SetSize(width,height)
Canvas1.DrawText(s,X,Y,fx.DefaultFont(30),fx.Colors.Black,"LEFT")
Return Canvas1.Snapshot2(fx.Colors.Transparent)

But I find its edges are cut a bit.

Font size: 16

Font siz: 30

MicroDrie · Oct 16, 2021

B4X:

width=r.Width
height=r.Height

The dimensions of the image are not square, but rectangular with a size of 69 x 72 pixels. By making the height and width the same, you lose the bottom of the image. It seems that the height and width are the same height for the underlying canvas so the bottom of the image is not shown.

update: add missing canvas reference in text

xulihang · Oct 16, 2021

I switched to using JavaFX's Text node to render text

B4X:

    Dim text As JavaObject
    text.InitializeNewInstance("javafx.scene.text.Text", Array(s))
    text.RunMethod("setFont", Array(f))
    Dim n As Node = text
    Return n.Snapshot2(fx.Colors.Transparent)

B4J Question How to render text to images?

xulihang

Active Member

MicroDrie

Well-Known Member

xulihang

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B4J Question How to render text to images?

xulihang

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MicroDrie

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xulihang

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