Erase Drawstring (ImageLibEx)

[micro]

Hi to all
how can I delete the text previously written with Drawer.DrawString1 (String, SolidBrush.Value, x, y)?
Of course I use ImagelibEx library of Agraham.

 

[klaus]

Draw the same text with the background color.

Best regards.

 

[mjcoon]

Draw the same text with the background color.

Best regards.

Which of course can only work if the area concerned was occupied solely by the background colour before the text was drawn!

Otherwise it would be necessary to save the area involved and re-instate it (somehow...).

Mike.

 

[micro]

The DrawString1 is used on the image con gradientfill, how i can save the area before and after recall?

 

[klaus]

You should define the rectangle occupied by the string before drawing it.
With the x and y coordinates, Drawer.StringHeight and Drawer.StringWidth.
Copy the string background part to a bitmap.
To erase the string copy back the saved background part of the screen.

Best regards.

 

[micro]

I'm sorry Klaus, but it does not work
you can give me an example?

................
drawer.nfont.New1("", 20, 1)
   drawer.nfont.Name = "Arial"
   drawer.drwstr.Font = drawer.nfont.Value
   str = "Prova"
   drawer.Sbrush.Color = cBlack
   ''''save
   drawer.bmp.New2(drawer.drwstr.StringHeight(str), drawer.drwstr.StringWidth(str))
   drawer.Rectsave.New1(48, 48, drawer.drwstr.StringHeight(str) + 1, drawer.drwstr.StringWidth(str) + 1)
   drawer.bmp.ScreenCapture(drawer.Rectsave.Value)
   ''''
drawer.Sbrush.Color = cBlack
   drawer.drwstr.DrawString1(str, drawer.Sbrush.Value, 50, 50)
   drawer.Sbrush.Color = cWhite
   drawer.drwstr.DrawString1(str, drawer.Sbrush.Value, 49, 49)
........
........
'restore
drawer.drwstr.DrawImage(drawer.bmp.Value, drawer.Rectsave.Value, drawer.Rectsave.Value, True)
   Form1.Refresh

 

[mjcoon]

You should define the rectangle occupied by the string before drawing it.
With the x and y coordinates, Drawer.StringHeight and Drawer.StringWidth.
Copy the string background part to a bitmap.
To erase the string copy back the saved background part of the screen.

Best regards.

I have a background info query. I haven't done fancy string drawing in B4PPC. But I recollect that in general the reference starting point of a string is the base line; most of the text is above but descenders are below. Is this how it works in B4PPC, or is the reference at lowest descender height or highest point of ascenders? Unless it is one of those latter, Drawer.StringHeight would not be enough information to define the enclsoing rectangle.

TIA, Mike.

 

[klaus]

I will look if I can do soemthing.
I haven't played with B4PPC for more than two years now.
But leave me some time til tuesday.

Best regards.

 

[micro]

Thanks Klaus
Best regards

 

[klaus]

Attached you find a small demo program.
I leave it up to you to adapt it to your needs.
If you want to erase more than the last text drawn you should use arrays to memorise the rectangles and background images.

Best regards.

 

[micro]

Thanks
:icon_clap:

 

[mjcoon]

Attached you find a small demo program.

I got a crash when I clicked the "Erase" button (see attachment).

Mike.

(Ah, I see it just assumes that there has been a mouse-down.)

 

[micro]

Before draw a text on screen (mouse_click) and then Erase.