138 lines
4.9 KiB
Lua
138 lines
4.9 KiB
Lua
--[[
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Copyright (c) 2016 George Prosser
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the "Software"), to deal in the Software without
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restriction, including without limitation the rights to use,
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copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following
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conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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]]
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local slider = {}
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slider.__index = slider
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function newSlider(x, y, length, value, min, max, setter, style)
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local s = {}
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s.value = (value - min) / (max - min)
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s.min = min
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s.max = max
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s.setter = setter
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s.x = x
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s.y = y
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s.length = length
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local p = style or {}
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s.width = p.width or length * 0.1
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s.orientation = p.orientation or 'horizontal'
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s.track = p.track or 'rectangle'
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s.knob = p.knob or 'rectangle'
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s.grabbed = false
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s.wasDown = true
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s.ox = 0
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s.oy = 0
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return setmetatable(s, slider)
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end
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function slider:update(mouseX, mouseY, mouseDown)
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local x = mouseX or love.mouse.getX()
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local y = mouseY or love.mouse.getY()
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local down = love.mouse.isDown(1)
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if mouseDown ~= nil then
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down = mouseDown
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end
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local knobX = self.x
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local knobY = self.y
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if self.orientation == 'horizontal' then
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knobX = self.x - self.length/2 + self.length * self.value
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elseif self.orientation == 'vertical' then
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knobY = self.y + self.length/2 - self.length * self.value
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end
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local ox = x - knobX
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local oy = y - knobY
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local dx = ox - self.ox
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local dy = oy - self.oy
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if down then
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if self.grabbed then
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if self.orientation == 'horizontal' then
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self.value = self.value + dx / self.length
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elseif self.orientation == 'vertical' then
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self.value = self.value - dy / self.length
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end
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elseif (x > knobX - self.width/2 and x < knobX + self.width/2 and y > knobY - self.width/2 and y < knobY + self.width/2) and not self.wasDown then
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self.ox = ox
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self.oy = oy
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self.grabbed = true
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end
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else
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self.grabbed = false
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end
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self.value = math.max(0, math.min(1, self.value))
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if self.setter ~= nil then
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self.setter(self.min + self.value * (self.max - self.min))
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end
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self.wasDown = down
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end
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function slider:draw()
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if self.track == 'rectangle' then
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if self.orientation == 'horizontal' then
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love.graphics.rectangle('line', self.x - self.length/2 - self.width/2, self.y - self.width/2, self.length + self.width, self.width)
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elseif self.orientation == 'vertical' then
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love.graphics.rectangle('line', self.x - self.width/2, self.y - self.length/2 - self.width/2, self.width, self.length + self.width)
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end
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elseif self.track == 'line' then
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if self.orientation == 'horizontal' then
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love.graphics.line(self.x - self.length/2, self.y, self.x + self.length/2, self.y)
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elseif self.orientation == 'vertical' then
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love.graphics.line(self.x, self.y - self.length/2, self.x, self.y + self.length/2)
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end
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elseif self.track == 'roundrect' then
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if self.orientation == 'horizontal' then
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love.graphics.rectangle('line', self.x - self.length/2 - self.width/2, self.y - self.width/2, self.length + self.width, self.width, self.width/2, self.width)
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elseif self.orientation == 'vertical' then
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love.graphics.rectangle('line', self.x - self.width/2, self.y - self.length/2 - self.width/2, self.width, self.length + self.width, self.width, self.width/2)
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end
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end
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local knobX = self.x
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local knobY = self.y
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if self.orientation == 'horizontal' then
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knobX = self.x - self.length/2 + self.length * self.value
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elseif self.orientation == 'vertical' then
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knobY = self.y + self.length/2 - self.length * self.value
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end
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if self.knob == 'rectangle' then
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love.graphics.rectangle('fill', knobX - self.width/2, knobY - self.width/2, self.width, self.width)
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elseif self.knob == 'circle' then
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love.graphics.circle('fill', knobX, knobY, self.width/2)
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end
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end
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function slider:getValue()
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return self.min + self.value * (self.max - self.min)
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end |