Canvas.scale() | LuaRT free and open source Windows programming framework for Lua

Canvas:identity() method

Resets the Canvas transformation to the default identity matrix

Return value

This function returns no value.

Example


local ui = require "ui"
require "canvas"

local win = ui.Window("Canvas - Scaling example", "fixed", 150, 150)

local c = ui.Canvas(win)
c.align = "all"

local scale = 0
local delta = 0.02

-- Uses internal timer for 30fps drawing
function c:onPaint()
    self:begin()
    self:clear(0xffffffff)
    -- Resets the canvas transformations
    c:identity()
    -- Sets the new scale transformation
    c:scale(scale, scale)
    c:fillrect(50,50,100,100, 0xF0A0D7FF)
    self:flip()
    sleep()
    scale = scale + delta
    if scale > 2 then
        delta = -0.02
    elseif scale < 0.02 then
        delta = 0.02
    end
end

ui.run(win):wait()