main.lua

-- lick = require "lick"
-- lick.reset = true

function love.load()
    love.graphics.setBackgroundColor(139, 137, 137)
    love.graphics.setColor(205, 201, 201)
    circle = {}
    circle.x = 1
    circle.y = 0

    square = {}
    square.x = 0
    square.y = 1

    highlight = love.graphics.newShader([[
        extern vec2 source;
        extern vec2 source2;
        extern float radius;
        vec4 effect(vec4 color, Image texture, vec2 tc, vec2 screen) {
            float d = distance(screen, source);
            float d2 = distance(screen, source2);
            if (d >= radius && d2 >= radius) {
                return vec4(0, 0, 0, 1.0);
            } else if (d < radius && d2 < radius) {
                return vec4(color[0], color[1], color[2],
                    min(d/radius, d2/radius));
            } else if (d < radius) {
                return vec4(color[0], color[1], color[2], d/radius);
            } else if (d2 < radius) {
                return vec4(color[0], color[1], color[2], d2/radius);           
            }
        }
        ]])

    highlight:send("radius", 150)
    rainbow = love.graphics.newShader([[
        vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 screen) {
            return vec4(screen.x / 512, screen.y / 512, 0.0, 1.0);
        }
        ]])
end

function love.update(dt)
    circle.x = circle.x + dt*2
    circle.y = circle.y + dt*2

    square.x = love.mouse.getX() - 10
    square.y = love.mouse.getY() - 10
    -- square.x = square.x + dt*2
    -- square.y = square.y + dt*2
end

function love.draw(dt)
    x = 400+200*math.sin(circle.x)
    y = 300+200*math.sin(circle.y)

    x2 = square.x
    y2 = square.y


    love.graphics.setColor(255, 255, 200)
    love.graphics.rectangle("fill", 100, 100, 50, 50)
    love.graphics.setColor(255, 100, 0)
    love.graphics.rectangle("fill", 200, 200, 50, 50)
    love.graphics.rectangle("fill", 400, 200, 50, 50)
    love.graphics.setColor(100, 255, 90)
    love.graphics.rectangle("fill", 400, 400, 50, 50)


    highlight:send("source", {x, love.window.getHeight() - y})
    highlight:send("source2", {x2 + 10, love.window.getHeight() - (y2 + 10)})
    love.graphics.setShader(highlight)
    love.graphics.setColor(0, 0, 0);
    love.graphics.rectangle("fill", 0, 0, love.window.getWidth(), love.window.getHeight())

    love.graphics.setShader(rainbow)
    love.graphics.setColor(255, 255, 255)
    love.graphics.circle("fill", x, y, 16,16)
    love.graphics.rectangle("fill", x2, y2, 20, 20)

    love.graphics.setShader()
end