mirror of
https://github.com/EsotericSoftware/spine-runtimes.git
synced 2025-12-21 09:46:02 +08:00
85 lines
3.0 KiB
Lua
85 lines
3.0 KiB
Lua
-------------------------------------------------------------------------------
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-- Spine Runtimes License Agreement
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-- Last updated January 1, 2020. Replaces all prior versions.
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--
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-- Copyright (c) 2013-2020, Esoteric Software LLC
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--
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-- Integration of the Spine Runtimes into software or otherwise creating
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-- derivative works of the Spine Runtimes is permitted under the terms and
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-- conditions of Section 2 of the Spine Editor License Agreement:
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-- http://esotericsoftware.com/spine-editor-license
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--
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-- Otherwise, it is permitted to integrate the Spine Runtimes into software
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-- or otherwise create derivative works of the Spine Runtimes (collectively,
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-- "Products"), provided that each user of the Products must obtain their own
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-- Spine Editor license and redistribution of the Products in any form must
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-- include this license and copyright notice.
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--
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-- THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
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-- EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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-- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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-- DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
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-- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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-- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
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-- BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
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-- ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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-- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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-- THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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-------------------------------------------------------------------------------
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local utils = require "spine-lua.utils"
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local interpolation = require "spine-lua.Interpolation"
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local setmetatable = setmetatable
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local math_min = math.min
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local math_max = math.max
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local ipairs = ipairs
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local table_insert = table.insert
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local table_remove = table.remove
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local utils_deg_rad = utils.degRad
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local math_sqrt = math.sqrt
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local math_sin = math.sin
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local math_cos = math.cos
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local SwirlEffect = {}
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SwirlEffect.__index = SwirlEffect
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function SwirlEffect.new (radius)
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local self = {
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worldX = 0,
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worldY = 0,
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centerX = 0,
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centerY = 0,
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radius = radius,
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angle = 0,
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interpolation = interpolation.pow2
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}
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setmetatable(self, SwirlEffect)
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return self
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end
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function SwirlEffect:beginEffect (skeleton)
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self.worldX = skeleton.x + self.centerX
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self.worldY = skeleton.y + self.centerY
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self.angleRad = self.angle * utils_deg_rad
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end
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function SwirlEffect:transform (vertex)
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local x = vertex.x - self.worldX
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local y = vertex.y - self.worldY
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local dist = math_sqrt(x * x + y * y)
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if (dist < self.radius) then
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local theta = interpolation.apply(self.interpolation, 0, self.angleRad, (self.radius - dist) / self.radius)
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local cos = math_cos(theta)
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local sin = math_sin(theta)
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vertex.x = cos * x - sin * y + self.worldX
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vertex.y = sin * x + cos * y + self.worldY
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end
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end
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function SwirlEffect:endEffect ()
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end
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return SwirlEffect
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