Unable to draw rect at 0,0 when window maximised on MacOS

[J7mbo]

Hi! I'm new to ebiten. I'm trying to draw an image at 0,0. This works fine when the window is like it is in the examples, however when the window is maximised and I draw at (what I think should be) 0,0, there's a large margin on the left.

Windowed, works fine:

With ebiten.SetFullscreen(true):

Please note that I'm moving the mouse to the top of the screen here to show you where the box starts

Here's the ebiten code:

    ebiten.SetWindowSize(800, 600)
    ebiten.SetWindowDecorated(true)
    ebiten.SetWindowResizingMode(ebiten.WindowResizingModeEnabled)
    ebiten.SetFullscreen(true)

And the draw rect code (I've used multiple libraries and I don't believe it's related, could do it by hand too) :

import "github.com/fogleman/gg"

func init() {
        dc := gg.NewContext(800, 600)
	dc.DrawRectangle(0, 0, 50, 50)
	dc.SetColor(color.White)
	dc.Fill()

        // Image is the *ebiten.Image from the tutorial
	img = ebiten.NewImageFromImage(dc.Image())
}

func (g *Game) Draw(screen *ebiten.Image) {
	screen.DrawImage(img, nil)
}

Why can't I display a rectangle at 0,0 when full-screened? Am I doing something wrong here?

[hajimehoshi]

It's because the aspect ratios (the actual screen size and the returning value of Layout) don't match. What is the implementation of Layout? Thanks,

[J7mbo]

Thanks for such a fast response @hajimehoshi! Sat here scratching my head for a day already...

func (g *Game) Layout(outsideWidth, outsideHeight int) (screenWidth, screenHeight int) {
	return 800, 600
}

So the Layout is definitely the same as what I pass in SetWindowSize.

[hajimehoshi]

When your game is in the fullscreen mode, the outside size's aspect ratio is different from the aspect ratio of 800x600. If you want to adjust the game screen size with the outside size,

func (g *Game) Layout(outsideWidth, outsideHeight int) (screenWidth, screenHeight int) {
	return outsideWidth, outsideHeight
}

should work.

[J7mbo]

Additional info: When I maximise the window myself, there is a second where the white box is indeed in the top left corner at 0,0, but with the wrong aspect ratio. But then the box jumps over to the right as in the second screenshot, and the aspect ratio is fixed.

[J7mbo]

Ah yes, your change to return fixed this. Facepalm here. Many thanks hajimehoshi! Wishing you a great weekend :)

[hajimehoshi]

I'm very glad that your issue was solved. Thank you for using Ebitengine!