Old 01-16-2017, 09:02 PM   #1
Lokasenna
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Default API: reaper.GetMousePosition is off a little

Reusing code from the other nitpick thread I just posted, but whatever.

reaper.GetMousePosition is returning a point slightly to the right and a full cursor down from where my mouse cursor's point actually is. The code below should open with the window centered on the cursor (center being where the two lines meet), but as you can see:



Whoops? I think it's just not taking the window frame into account, but from what I can tell the only way to get proper coordinates in that sense is to query gfx.dock, which isn't available until after the window opens, which would necessitate quitting and reopening the window. Seems a bit much.

Code:
local name, w, h = "", 258, 258

local x, y = reaper.GetMousePosition()
x, y = x - (w / 2), y - (h / 2)

local ox, oy = w / 2, h / 2

local angle_a = -0.25 * math.pi
local angle_b = 0.25 * math.pi
local r = 96

function Main()
	
	local quit = gfx.getchar()
	if quit == -1 or quit == 27 then return 0 end


	gfx.set(0.2, 1, 0.2, 1)
	
	local ax = ox + r * math.cos(angle_a)
	local ay = oy + r * math.sin(angle_a)
	gfx.line(ox, oy, ax, ay)
	
	local bx = ox + r * math.cos(angle_b)
	local by = oy + r * math.sin(angle_b)
	gfx.line(ox, oy, bx, by)
	
	
	gfx.set(1, 0.2, 0.2, 1)

	gfx.arc(ox, oy, r, angle_a, angle_b, 1)

		
	reaper.defer(Main)
	gfx.update()
	
end

gfx.init(name, w, h, 0, x, y)
Main()
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Last edited by Lokasenna; 01-16-2017 at 09:09 PM.
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Old 01-17-2017, 05:57 AM   #2
schwa
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Default

It is opening the window exactly where you ask it to. As you say, it's positioning the upper left corner of the window there, not the upper left corner of the client area. It's not a typical use to need to calculate where the client area of a window would be before the window is opened; this is somewhat awkward to do even if you have access to the full Windows or macOS API.
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Old 01-17-2017, 06:03 AM   #3
Lokasenna
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Fair enough, I'll stick with my "fudge the numbers a bit" approach. Cheerio.
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