honeylisp/vendor/lite-plugins/plugins/motiontrail.lua

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local core = require "core"
local config = require "core.config"
local style = require "core.style"
local DocView = require "core.docview"
config.motiontrail_steps = 50
local function lerp(a, b, t)
return a + (b - a) * t
end
local function get_caret_rect(dv)
local line, col = dv.doc:get_selection()
local x, y = dv:get_line_screen_position(line)
x = x + dv:get_col_x_offset(line, col)
return x, y, style.caret_width, dv:get_line_height()
end
local last_x, last_y, last_view
local draw = DocView.draw
function DocView:draw(...)
draw(self, ...)
if self ~= core.active_view then return end
local x, y, w, h = get_caret_rect(self)
if last_view == self and (x ~= last_x or y ~= last_y) then
local lx = x
for i = 0, 1, 1 / config.motiontrail_steps do
local ix = lerp(x, last_x, i)
local iy = lerp(y, last_y, i)
local iw = math.max(w, math.ceil(math.abs(ix - lx)))
renderer.draw_rect(ix, iy, iw, h, style.caret)
lx = ix
end
core.redraw = true
end
last_view, last_x, last_y = self, x, y
end