Blitz and mouse Y coordinate

peceha · 25 December 2018, 15:01

Hi,
I have a display 320x256 (done with initcoplist and createdisplay) and it shows almost fine*.
But I cannot get the mouse Y coordinate bigger then 199. How to get the reading for remaining 56 lines? Looks like my invisible mouse pointer cannot pass 200 lines vertically.

*shows almost fine - here comes a bonus qestion
When I use CreateDisplay command (320x256 bitmap and screen) the picture is off by 1 pixel. The left most column (x=0) is displayed as most right column (x=319) - Blitz just wraps around the first column.
Is it normal behaviour?

Thanks.

Shatterhand · 25 December 2018, 19:28

I don't rememeber having this problem, but try using the MouseArea command

MouseArea 0,0,320,256

It should work.

For your bonus question.... I've seen this behaviour before, but I can't remember what it was causing it. But no, it shouldn't be normal I guess.

Graham Humphrey · 25 December 2018, 19:41

Make sure you haven't got the smooth scrolling flag set in the InitCopList command. I've had that before - I only wanted to scroll vertically so to get around it I made the bitmap slightly wider horizontally which is a bit of a cheap workaround.

peceha · 25 December 2018, 20:12

Thanks to both of you.
MouseArea fixed the problem with the limitation on Y axis.
Getting rid of SmoothScroll flag fixed the display.

madaxe · 23 March 2019, 22:34

By the way, how to display the mouse cursor? Is it always needed to set a Sprite and use the Pointer command or can I just use the system mouse cursor?

Daedalus · 24 March 2019, 14:33

If you shut down the OS (i.e., use the BLITZ command) then the OS can't provide the pointer - you have to do it yourself. The OS uses hardware sprites for the mouse pointer, so it sort of makes sense because all the sprites are available to you in BLITZ mode.

madaxe · 24 March 2019, 17:41

Thanks Daedalus, it really makes sense.
But I think that I'm doing something wrong because after defining my sprite and using the Pointer command I get this error: "No currently used object!"

So I improvised a little trick that is to use the mouse coordenates to move the Sprite.

Code:

 DisplaySprite 0,0,MouseX,MouseY,0

Daedalus · 25 March 2019, 09:48

I'm pretty sure the Pointer command only applies to Slices, so you can't use it with the Display Library. So your solution is the way to do it

25 December 2018, 15:01	#1
peceha Registered User Join Date: Dec 2017 Location: Poland Age: 47 Posts: 282	Blitz and mouse Y coordinate Hi, I have a display 320x256 (done with initcoplist and createdisplay) and it shows almost fine. But I cannot get the mouse Y coordinate bigger then 199. How to get the reading for remaining 56 lines? Looks like my invisible mouse pointer cannot pass 200 lines vertically. shows almost fine - here comes a bonus qestion When I use CreateDisplay command (320x256 bitmap and screen) the picture is off by 1 pixel. The left most column (x=0) is displayed as most right column (x=319) - Blitz just wraps around the first column. Is it normal behaviour? Thanks.

24 March 2019, 17:41	#7
madaxe Registered User Join Date: Jan 2019 Location: Coimbra / Portugal Posts: 54	Thanks Daedalus, it really makes sense. But I think that I'm doing something wrong because after defining my sprite and using the Pointer command I get this error: "No currently used object!" So I improvised a little trick that is to use the mouse coordenates to move the Sprite. Code: DisplaySprite 0,0,MouseX,MouseY,0 Last edited by madaxe; 25 March 2019 at 13:44.

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25 December 2018, 19:28	#2
Shatterhand Warhasneverbeensomuchfun Join Date: Jun 2001 Location: Rio de Janeiro / Brazil Age: 41 Posts: 3,450	I don't rememeber having this problem, but try using the MouseArea command MouseArea 0,0,320,256 It should work. For your bonus question.... I've seen this behaviour before, but I can't remember what it was causing it. But no, it shouldn't be normal I guess.

25 December 2018, 19:41	#3
Graham Humphrey Moderator Join Date: Jul 2004 Location: Norwich, Norfolk, UK Age: 37 Posts: 11,167	Make sure you haven't got the smooth scrolling flag set in the InitCopList command. I've had that before - I only wanted to scroll vertically so to get around it I made the bitmap slightly wider horizontally which is a bit of a cheap workaround.

25 December 2018, 20:12	#4
peceha Registered User Join Date: Dec 2017 Location: Poland Age: 47 Posts: 282	Thanks to both of you. MouseArea fixed the problem with the limitation on Y axis. Getting rid of SmoothScroll flag fixed the display.

23 March 2019, 22:34	#5
madaxe Registered User Join Date: Jan 2019 Location: Coimbra / Portugal Posts: 54	By the way, how to display the mouse cursor? Is it always needed to set a Sprite and use the Pointer command or can I just use the system mouse cursor?

24 March 2019, 14:33	#6
Daedalus Registered User Join Date: Jun 2009 Location: Dublin, then Glasgow Posts: 6,334	If you shut down the OS (i.e., use the BLITZ command) then the OS can't provide the pointer - you have to do it yourself. The OS uses hardware sprites for the mouse pointer, so it sort of makes sense because all the sprites are available to you in BLITZ mode.

25 March 2019, 09:48	#8
Daedalus Registered User Join Date: Jun 2009 Location: Dublin, then Glasgow Posts: 6,334	I'm pretty sure the Pointer command only applies to Slices, so you can't use it with the Display Library. So your solution is the way to do it

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