touch.lua

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-- Code related to touch interactions (from Codea, not yet updated for Love2D)
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-- toggle booleans if clicked in areas where button / sliders are
function love.mousepressed(x, y, button)

    -- print(x)
    -- print(y)

    --[[ fun times
    if shotInProgress == true then
        explode(x,y)
    end
    ]] --

    -- rectangle on bottom-right to detect pressing shoot button
    if shotInProgress == false and (x > (WIDTH - 100) and y > HEIGHT - 100) then
        playerPressedShootButton()
    end

    if shotInProgress == false then
        clickNearShip = nearShip(x, y, currentPlayer())

        if clickNearShip == 'force' then
            mouseXinitial = x
            draggingType = 'force'
            dragging = true
            love.mouse.setCursor(dragCursor)
        elseif clickNearShip == 'angle' then
            mouseXinitial = x
            draggingType = 'angle'
            dragging = true
            love.mouse.setCursor(dragCursor)
        end

    end

end

-- returns 'force', 'angle', 'no'
function nearShip(x, y, playerN)

    forceOffset = 100 * playerN.force / 5

    distance = math.pow(math.pow((playerN.x - x), 2) + math.pow((playerN.y - y), 2), 0.5)

    if distance < clamp(forceOffset, 10, 90) then
        return 'force'
    elseif distance < 100 then
        return 'angle'
    else
        return 'no'
    end

end


-- short circuit the love.update function with boolean
function love.mousereleased(x, y, button)
    dragging = false
    love.mouse.setCursor()
end

-- if the mouse is being dragged after clicking, update the values of force or angle
-- uses distance from initial click for smoothly
function love.update(dt)
    if dragging then

        mouseXcurrent = love.mouse.getX()

        if mouseXinitial ~= mouseXcurrent then

            diff = mouseXcurrent - mouseXinitial

            if draggingType == 'angle' then

                if turn == 1 then
                    player1.angle = getAngle(player1, diff)
                elseif turn == 2 then
                    player2.angle = getAngle(player2, diff)
                end

            elseif draggingType == 'force' then

                if turn == 1 then
                    player1.force = getForce(player1, diff)
                elseif turn == 2 then
                    player2.force = getForce(player2, diff)
                end

            end

            love.graphics.setCanvas(canvas)
            drawUI()
            love.graphics.setCanvas()

        end
    end

    -- if shotInProgress == false then
    --     if keyUp then
    --         player1.force = player1.force * 1.01
    --     end
    -- end
end

function getForce(playerN, diff)

    return clamp(playerN.force + clamp(math.pow(diff / 1000, 3), -0.02, 0.02), 0, 5)

end

function getAngle(playerN, diff)

    angle = playerN.angle + clamp(math.pow(diff / 200, 3), -1, 1)
    if angle > 360 then
        angle = angle - 360
    elseif angle < 0 then
        angle = angle + 360
    end

    return angle

end

-- make the input value never go below min or above max
function clamp(value, min, max)

    return math.max(math.min(value, max), min)

end