How to move a part of a canvas

[shingoscar]

Code: Select all

function love.load(arg, unfilteredArg)
    image = love.graphics.newImage('blocks.png')
    canvas = love.graphics.newCanvas(1000, 1000)
    canvas:renderTo(function ()
        love.graphics.draw(image, 0, 0)
    end)
end

function love.draw()
    love.graphics.draw(canvas)
end

I want to move a part of the canvas (0,0,100,100) to (100,100), so I use the code below:

Code: Select all

canvas:renderTo(function ()
    local quad = love.graphics.newQuad(0, 0, 100, 100, canvas:getDimensions())
    love.graphics.draw(canvas, quad, 100, 100)
end)

But this gives me the error: Cannot render a Canvas to itself!

Please help me to achieve the purpose.

[ReFreezed]

Just draw 'image' to different coordinates?

Code: Select all

canvas:renderTo(function()
	love.graphics.draw(image, 100, 100)
end)

[shingoscar]

Just draw 'image' to different coordinates?

Thanks, but the image here is for convience, the canvas is quite complex than a single image.

[steVeRoll]

Then clear the canvas and redraw it, with the image in the new coordinates.

[zorg]

Or use two canvases, and render one to the other, and then swap, and only draw out the currently active one to the screen... not sure which approach has the best performance; your original issue was that you can't render to the same canvas you want to draw, but you can render one to another, probably even with a quad.