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-- mod-version:3
local core = require "core"
local config = require "core.config"
local common = require "core.common"
local style = require "core.style"
local DocView = require "core.docview"
config.plugins.motiontrail = common.merge({
enabled = true,
steps = 50,
-- The config specification used by the settings gui
config_spec = {
name = "Motion Trail",
{
label = "Enabled",
description = "Disable or enable the caret motion trail effect.",
path = "enabled",
type = "toggle",
default = true
},
{
label = "Steps",
description = "Amount of trail steps to generate on caret movement.",
path = "steps",
type = "number",
default = 50,
min = 10,
max = 100
},
}
}, config.plugins.motiontrail)
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, 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 not config.plugins.motiontrail.enabled or 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.plugins.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
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