Mouse Scroll

[M0lD]

how do i collect input from the mouse scroll?

[AggrorJorn]

The Z index from MousePosition stores the mouse wheel.

https://www.leadwerks.com/learn?page=API-Reference_Object_Window_GetMousePosition

[GorzenDev]

FYI the z index of mouseposition is cumulative.

To get proper values you could do something like:

	local oldWheelPos = 0.0
	if self.currentMousePos ~= nil then
		oldWheelPos = self.currentMousePos.z 
	end

	self.currentMousePos = window:GetMousePosition()
	self.currentMousePos.x = Math:Round(self.currentMousePos.x)
	self.currentMousePos.y = Math:Round(self.currentMousePos.y)

	local newWheelPos = (self.currentMousePos.z - oldWheelPos) * 0.1
	if newWheelPos > 0.0 or newWheelPos < 0.0 then
		self.curZoom = self.curZoom + newWheelPos
		if self.curZoom < self.maxZoom then
			self.curZoom = self.maxZoom
		elseif self.curZoom > self.minZoom then
			self.curZoom = self.minZoom
		end
	end

 

[M0lD]

Thk

[AggrorJorn]

Nice script GorzenDev. That would be a nice addition to the documentation samples.

Little side note:

if self.curZoom < self.maxZoom then
    self.curZoom = self.maxZoom
elseif self.curZoom > self.minZoom then
    self.curZoom = self.minZoom
end

could be shortened to

self.curZoom = Math:Clamp(self.curZoom, self.maxZoom, self.minZoom)

 

[GorzenDev]

Does clamp get a proper result when negative values are used?
Since in that case the self.maxZoom would be the smallest value of the 2.
maiby flip them around ?

During optimisation i did at one point use clamp but got a bad result so reverted it back and never looked at it again.

[AggrorJorn]

I have a similar situation with camera min/max angles where this works fine. For camera rotation the max angle is actually negative (although the name would suggest otherwise). Based on your if statements and the inversed use of max/min zoom, I figured that for the zooming something similar would be happening.