set mouseklick start

[nadula]

Hi,

I have a labyrinth and want to click with the mouse to set the start point. I call love.mousepressed(x, y, button) and have defined start, but love draw is executed at first and if I say start point in love.draw , it has a nil value. So the start image should appear when the mouse is clicked.Can someone give me an advice. Thank you

[Ref]

Look at the WIKI example for mousepressed.
Assign some default values to x & y.
Check in draw if the values have changed.

[nadula]

I tried so . i took x ,y =0 . the start image was drawn at x,y =0 and as I klicked with the mouse it disappered

[Roland_Yonaba]

Code: Select all

local startPoint -- undefined

function love.draw()
  -- draw the startPoint if defined
  if startPoint then
    love.graphics.draw(startPoint.x, startPoint.y, startPoint.image)
  end
end

function love.mousepressed(x,y,button)
  -- Define the startPoint.
  -- You might want to it once, then wrap the following into an appropriate if-clause
  startPoint = {x = x, y = y, image = someImage}
end

How is that working for you ?

[nadula]

Thank you,Roland, I tried a variable named status true or false but it doesn't work

Code: Select all

function love.load()

map={}
	k=1
	v=1
    for line in love.filesystem.lines("labyrinth1.txt") do
	map[k] = {}
	for i in string.gmatch(line,"%S+") do
	map[k][v] = tonumber(i)
	v= v+1
	end
	k= k+1
	v=1
	end

  target = {
      grid_x = 13,
      grid_y = 10
  }


   status = false

  img_fn = {"robot"}
  imgs = {}
  for _,v in ipairs(img_fn) do
    imgs[v]=love.graphics.newImage("assets/"..v..".png")
  end

  -- load sounds
  ups = love.audio.newSource( "assets/ups.ogg" , "static" )
  yeah = love.audio.newSource( "assets/yeah.wav" , "static" )

end

function love.draw()
    for y=1, #map do
        for x=1, #map[y] do
            if map[y][x] == 1 then
            	love.graphics.setColor(50,50,50)
                love.graphics.rectangle("fill", x * scale, y * scale, scale, scale)
            else
            	love.graphics.setColor(255,255,255)
            	love.graphics.rectangle("fill", x * scale+1, y * scale+1, scale-2, scale-2)
				end
        end
    end

    love.graphics.setColor(0,200,0)
    love.graphics.setPointStyle("smooth")
    love.graphics.setPointSize(scale-2)
    love.graphics.point(target.grid_x*scale + scale /2, target.grid_y*scale + scale / 2)

if status then
  love.graphics.setColor(200,0,0)
    love.graphics.setPointStyle("smooth")
    love.graphics.setPointSize(scale-2)
    love.graphics.point(start.grid_x*scale + scale /2, start.grid_y*scale + scale / 2)
	    love.graphics.setColor(255,255,255)
    love.graphics.draw(imgs["robot"], start.grid_x*scale + scale /2, start.grid_y*scale + 18)
	end

end

function love.mousepressed(x, y, button)
   if button == 'l' then
      start = {grid_x = x, grid_y = y}
	  status = true
   end
end

[Roland_Yonaba]

Thank you,Roland, I tried a variable named status true or false but it doesn't work

Can you just give us a *.love file ?

[nadula]

Sorry, now the lua file

[nadula]

Hi, I still need your help. Please, I could not implement the suggestion. Can someone tell me what's wrong in my code? Thank you