canvas module

cos00kun · 2023-04-24T06:55:11+02:00

Hello. Canvas instances are defined in the following folder and they are running in this folder. "C:\Program Files\Lua 5.4.2 Win64\LuaRT\LuaRT-Studio\example...

cos00kun

Hi [Login to see the link]
.......\LuaRT\LuaRT-Studio\examples\canvas\stamp.wlua this file does not work when we onclick the mouse and the program closes. can you check?

Samir

Hi Coskun,

I don't understand how to reproduce what you describe. The script works well on my side, without any problem when I close the window.

cos00kun

It seems that my computer at work continues to have problems. I tried at home now and there was no problem. sorry

Samir

Ok no problem

cos00kun

Does the canvas module also have an option to rotate the image?

Samir

Hi Coskun !

cos00kun Does the canvas module also have an option to rotate the image?

Canvas module don't have transform capabilities yet, but it's planned 📋️

cos00kun

[Login to see the link]

cos00kun

I started to write 🙂

Samir

wow that looks good!
Hope it's not too difficult !

cos00kun

of course it is difficult for me but it is so fun 🙂
I'm about to finish the physics engine

he shoots the ball according to the angle and distance and sends it to the right places. Then, by doing these in the second player, they will open cannon fire at each other and the one who can shoot at the right angle and at the right speed will have hit the other.

cos00kun

Samir I think I found the source of the problem.

.......
local imgImg= canvas:Image("Media/CannonBlue.png")
......
function canvas:onPaint()
	imgImg:draw(500,200)
end
......

The problem occurs when using imgImg:draw(......) on the computer at work. İnteresiting

Samir

cos00kun The problem occurs when using imgImg:draw(......) on the computer at work. İnteresiting

Maybe a graphics card driver problem 🤔🤔
For example Intel HD Graphics drivers have a known problem when using Direct2D, the API used under the hood with the Canvas Widget

ruby

Samir

I tried luart canvas.
on pc with intel graphic card, it did not work with image:draw ,
and on pc with nvdia graphic card, it did work without any problem.

Intel HD Graphics drivers have a known problem ....
interesting. never heard about this.
there are so many computers with inter HD graphic cards.

cos00kun

I tried but the problem is not solved. 🙂

Canvas:line(x0, y0, x1, y1, [ brush ], [ width ] ) we can use in the image for brush usage here.
in your statements;

[ brush ]
An optional value that can represent any of the following values :
A RGBA color, as an integer value
LinearGradient : The line will be drawn with a colored linear gradient
RadialGradient : The line will be drawn with a colored radial gradient
Image : The line will be drawn with a picture pattern.

How can I use "image" as "Brush" here? Should I write the image address?

Samir

You just put the Image value as the fifth arguments of the Canvas.line method :

-- Create an Image instance
local mypattern = canvas.Image("mypattern.png")

-- creates a line from 0,0 to 320,200 using this image as pattern with a width for 50px
canvas:line(0,0, 320, 200, mypattern, 50)

PS: I haven't already tested all drawing functions with Image brush, please give me a feedback if it works correctly 😄

cos00kun

oh sorry it is very basic 🙂 i will test it. thank you

cos00kun

It worked after a minor fix. 🙂

local mypattern = canvas.Image("mypattern.png")
to
local mypattern = canvas:Image("mypattern.png")

thank you again

Samir

Oops sorry for the typo!

cos00kun

Using :

ui.update(number)

function canvas:onPaint()

creates problems. (C stak overflow error)

Samir

Yes I'm not surprised, in fact the ui.update() function calls the onPaint() function and so on until the C stack is exhausted.
I'll see if I can avoid this.

Thanks for the bug report !

Samir

For the moment, if you really need to call ui.update() during rendering, you should disable the canvas.sync property by setting it to false.
This way the onPaint() event won't be fired, and you will need to put all the drawings inside the ui loop.
(See this example for drawing without the onPaint() event : [Login to see the link])

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