LAMW - creating a temporary BMP or PNG file
lazarus / 43-Android

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Manlio · 2019-09-07 22:13

In my app I need to create from scratch an image file, BMP or PNG, and
save it into a temporary folder.

What object can I use to create a new image, assign it a width and
height, draw some colors and lines in it, and save it to a file in a
temporary folder?

I tried with TBitmap, but it crashes. I guess that doesn't work on
Android...

With jBitmap, I see how it can open existing files, but not draw and
save to a file...

I could really use a tip or two, please...

Thanks!

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jmpessoa · 2019-09-11 13:31

You can try the demo "AppDrawingViewDemo1"

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Manlio · 2019-09-13 09:32

Quote from: jmpessoa on September 11, 2019, 03:31:50 pm

You can try the demo "AppDrawingViewDemo1"

I see that jDrawingView has a method "SaveToFile", but jDrawingView is
a visual component...

So you are (indirectly) suggesting that I should add a jDrawingView
component to the form, make it invisible, and use it to create the
image files?

I guess that it could be a solution... I'll try it

Thanks!

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jmpessoa · 2019-09-13 16:25

How do you will create a image "from scratch"?

maybe I didn't understand....

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Manlio · 2019-09-13 18:31

Quote from: jmpessoa on September 13, 2019, 06:25:52 pm
How do you will create a image "from scratch"?


For example, I use jWebView.LoadFromString() and in the HTML page I
want to include some images, for example some statistics. So, I want
to generate an image with statistics, where I draw all the things I
want to show, and save that image in a temporary file. And I link to
that file with an <IMG > tag inside the HTML code that I send to that
jWebView.

If I was in Windows, I would create a TBitmap object, set width and
height, paint on the canvas, and then save it to a file.

In other words, a non-visual component  (or library) that allows me to
create an image file, set width and height, draw text and images on
it, and then save it to a file.

Thanks!

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jmpessoa · 2019-09-13 18:55

Ok!

I will try implement some demo!

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jmpessoa · 2019-09-28 21:56

Hi, Manlio!

You can try the new demo: "AppDrawingInBitmap"

Thank you!

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Manlio · 2019-09-29 21:49

Thank you so much!

I will study the example and try to learn from it.

(And maybe ask some more questions later on...

Again thank you so much, very very appreciated!

Manlio