56 lines
1.6 KiB
Lua
56 lines
1.6 KiB
Lua
import "CoreLibs/graphics"
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import "CoreLibs/object"
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local gfx <const> = playdate.graphics
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class("PipMeter").extends(gfx.sprite)
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function PipMeter:init(initialValue, numPips, baseSize, sizeIncrement, spacing, circle)
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PipMeter.super.init(self)
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self.numPips = numPips
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self.baseSize = baseSize
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self.sizeIncrement = sizeIncrement or 1
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self.spacing = spacing or 1
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self:setZIndex(999)
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-- using arithmetic progression: sum = (n * (firstValue + lastValue)) / 2
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-- (plus spacing)
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local padBaseSize = baseSize + spacing
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local lastSize = padBaseSize + (numPips - 1) * sizeIncrement
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local width = (numPips * (padBaseSize + lastSize)) / 2 - spacing
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self:setSize(width, lastSize)
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if circle then
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self.drawFunc = gfx.drawCircleInRect
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self.fillFunc = gfx.fillCircleInRect
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else
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self.drawFunc = gfx.drawRect
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self.fillFunc = gfx.fillRect
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end
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self:setValue(initialValue)
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end
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function PipMeter:setValue(value)
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local img = gfx.image.new(self:getSize())
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gfx.pushContext(img)
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local offset = 0
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for i=1, self.numPips, 1 do
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local size = self.baseSize+(self.sizeIncrement*(i-1))
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if value >= i then
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self.fillFunc(offset, self.height - size, size, size)
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else
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self.drawFunc(offset, self.height - size, size, size)
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gfx.setColor(gfx.kColorWhite)
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self.fillFunc(offset+1, self.height - size +1, size-2, size-2)
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gfx.setColor(gfx.kColorBlack)
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end
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offset += size + self.spacing
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end
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gfx.popContext()
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self:setImage(img)
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end
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