deleting part of the screen

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r.voigt

in General Discussion • Other • 9 months ago

Hi,

I need some help regarding redrawing only part of the screen.

On the screen I draw point (from a measurement). In addition I write some text about statistics.

I now want to change the text (based on changed values) but I don't want to delete the points.

So I can't use background() in the draw() function.

I don't want to buffer the point values and redraw them every time.

Alternatively I could draw a retangle above the text. Also not very elegant.

Is there a better option?

Thanks

Robert

Replies(4)

tgptialves

Re: deleting part of the screen

9 months ago

Save a white image and load image, with the desired size of the "sub-window" and load it. This way you will only clean a part os the screen.

Alternatilily, with two for cycles you can set a pixel to a desired color in a space of the window:

for(int x=xStart ; x<xEnd ; x++)
for(int y=yStart ; y<yEnd ; y++)
set(x, y, whatevercolor);

r.voigt

Re: Re: deleting part of the screen

9 months ago

Thanks a lot. I'll use the second option.

PhiLho

Re: deleting part of the screen

9 months ago

" Save a white image and load image, with the desired size of the "sub-window" and load it."
It would be simpler to just use rect() with a white fill()...
The second option is just very very slow...

tgptialves

Re: deleting part of the screen

9 months ago

Or that, I'm impressed how I did not remember that.

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