mirror of
https://github.com/EsotericSoftware/spine-runtimes.git
synced 2025-12-21 01:36:02 +08:00
85 lines
3.1 KiB
Lua
85 lines
3.1 KiB
Lua
-------------------------------------------------------------------------------
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-- Spine Runtimes Software License v2.5
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--
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-- Copyright (c) 2013-2016, Esoteric Software
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-- All rights reserved.
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--
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-- You are granted a perpetual, non-exclusive, non-sublicensable, and
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-- non-transferable license to use, install, execute, and perform the Spine
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-- Runtimes software and derivative works solely for personal or internal
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-- use. Without the written permission of Esoteric Software (see Section 2 of
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-- the Spine Software License Agreement), you may not (a) modify, translate,
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-- adapt, or develop new applications using the Spine Runtimes or otherwise
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-- create derivative works or improvements of the Spine Runtimes or (b) remove,
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-- delete, alter, or obscure any trademarks or any copyright, trademark, patent,
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-- or other intellectual property or proprietary rights notices on or in the
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-- Software, including any copy thereof. Redistributions in binary or source
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-- form must include this license and terms.
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--
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-- THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
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-- IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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-- MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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-- EVENT SHALL ESOTERIC SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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-- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, BUSINESS INTERRUPTION, OR LOSS OF
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-- USE, DATA, OR PROFITS) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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-- IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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-- 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 |