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Is there another way to rotate a GUI Frame perfectly between two points?

Asked by
Rocketerkid 237 Moderation Voter
8 years ago

I can't think of a way to explain it. I'm basically taking two points and connecting them using a GUI Frame. It's working for the most part, but it gets off course in it's X dimension more and more as I move the points away in their Y dimension.

The names of the functions in this snippet should explain what they do, I just don't want to paste a lot of code if not needed. If you think it's an issue with one of them, though, I'd be more than happy to paste the functions.

local m = {};
m.AbsolutePosition = Vector2.new(0,0);
game:GetService("RunService").RenderStepped:connect(function()
    m.AbsolutePosition = Vector2.new(mouse.X,mouse.Y);
    connector.Size = UDim2.new(0,getDistance(a.AbsolutePosition,m.AbsolutePosition),0,connectorWidth);
    connector.Position = UDim2.new(0,getLeftMost(a.AbsolutePosition,m.AbsolutePosition).X,0,(a.AbsolutePosition.Y+m.AbsolutePosition.Y)/2);
    connector.Rotation = getAngleTo(a.AbsolutePosition,m.AbsolutePosition) * (180/math.pi);
end)

Here's a GIF of what it's doing.

1 answer

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Answered by
EgoMoose 802 Moderation Voter
8 years ago

This is what I use for drawing lines in 2D

function drawLine(p1, p2, parent)
    local v = (p2 - p1); -- vector between p2 and p1
    local frame = Instance.new("Frame", parent);
    frame.BorderSizePixel = 0;
    frame.BackgroundColor3 = Color3.new(0, 1, 0);
    frame.Size = UDim2.new(0, v.magnitude, 0, 1); -- set the length to that of the difference
    frame.Rotation = math.deg(math.atan2(v.y, v.x)); -- get the angle between the two points
    frame.Position = UDim2.new(0, (p1.x + v.x/2) - frame.Size.X.Offset/2, 0, (p1.y + v.y/2) - frame.Size.Y.Offset/2); -- position from the center b/c that's where frames rotate from
    return frame;
end;

The two key things to remember are tan(theta) = opposite/adjacent, then rearrange. The other thing is to position from the center because that's where gui objects rotate from.

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Thank you for the help :) Rocketerkid 237 — 8y
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