Canvas:scale()

Canvas:scale(x, y, [centerx], [centery])method

Applyies a scale transformation on the Canvas

Parameters

A number representing the x-axis scale factor.

A number representing the y-axis scale factor.

[centerx]

The horizonal coordinate for the scale center point, defaulting to the center of the Canvas.

[centery]

The vertical coordinate for the scale center point, defaulting to the center of the Canvas.

Return value

This function returns no value.

Example


--! luart-extensions
import 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

await win:showasync()