71 lines
2.5 KiB
Lua
71 lines
2.5 KiB
Lua
local Vec3 = require "lib/vec3"
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local tree = require "lib/tree"
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local EPSILON = 0.001
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--- @class Camera
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--- @field position Vec3
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--- @field velocity Vec3
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--- @field speed number
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--- @field pixelsPerMeter integer
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local camera = {
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position = Vec3 {},
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velocity = Vec3 {},
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acceleration = 0.2,
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speed = 5,
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pixelsPerMeter = 100,
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scale = 1
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}
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love.wheelmoved = function(x, y)
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if camera.scale > 2 and y > 0 then return end;
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if camera.scale < 0.5 and y < 0 then return end;
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camera.scale = camera.scale + 0.1 * y
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end
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---@todo Отрефакторить и вынести кнопки управления в controls, не должно быть таких ужасных проверок
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function camera:update(dt)
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local ps = tree.instance().panning
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if ps.delta:length() > 0 then
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local worldDelta = ps.delta:scale(1 / (self.pixelsPerMeter * self.scale)):scale(dt):scale(self.speed)
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self.velocity = self.velocity + worldDelta
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elseif love.keyboard.isDown("w") or love.keyboard.isDown("a") or love.keyboard.isDown("s") or love.keyboard.isDown("d") then
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local input = Vec3 {}
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if love.keyboard.isDown("w") then input = input + Vec3({ 0, -1 }) end
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if love.keyboard.isDown("a") then input = input + Vec3({ -1 }) end
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if love.keyboard.isDown("s") then input = input + Vec3({ 0, 1 }) end
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if love.keyboard.isDown("d") then input = input + Vec3({ 1 }) end
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input = input:normalize() or Vec3 {}
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self.velocity = self.velocity:add(input:scale(self.acceleration):scale(dt))
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if self.velocity:length() > self.speed then self.velocity = self.velocity:normalize() * self.speed end
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end
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self.position = self.position + self.velocity
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self.velocity = self.velocity -
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self.velocity * 5 *
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dt -- магическая формула, которая означает "экспоненциально замедлиться до нуля"
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if self.velocity:length() < EPSILON then self.velocity = Vec3 {} end
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end
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function camera:attach()
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local wc, hc = love.graphics.getWidth() / 2, love.graphics.getHeight() / 2
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love.graphics.push()
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love.graphics.translate(wc, hc)
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love.graphics.scale(self.pixelsPerMeter * self.scale)
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love.graphics.translate(-self.position.x, -self.position.y)
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end
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function camera:detach()
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love.graphics.pop()
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end
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--- @return Camera
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local function new()
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return setmetatable({}, {
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__index = camera
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})
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end
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return { new = new }
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