function onload()
    generateButtonParamitersHP()
    countHP = 0
    b_displayHP.label = tostring(countHP)
    b_displayHP.font_size = 70

    self.createButton(b_displayHP)
    self.createButton(b_plusHP)
    self.createButton(b_minusHP)
    self.createButton(b_plusHP5)
    self.createButton(b_minusHP5)
end

--Activates when + is hit. Adds 1 to 'countHP' then updates the display button.
function increaseHP()
    countHP = countHP + 1
    updateDisplayHP()
end


function decreaseHP()
    --Prevents countHP from going below 0
    if countHP > 0 then
        countHP = countHP - 1
        updateDisplayHP()
    end
end


function increaseHP5()
    countHP = countHP + 5
    updateDisplayHP()
end


function decreaseHP5()
    --Prevents countHP from going below 0
    if countHP > 4 then
        countHP = countHP - 5
    else
        countHP = 0
    end
    updateDisplayHP()
end

function customSetHP()
    local descriptionHP = self.getDescription()
    if descriptionHP != '' and type(tonumber(descriptionHP)) == 'number' then
        self.setDescription('')
        countHP = tonumber(descriptionHP)
        updateDisplayHP()
    end
end


function updateDisplayHP()
    b_displayHP.font_size = 70
    b_displayHP.label = tostring(countHP)
    self.editButton(b_displayHP)
end


function generateButtonParamitersHP()
    b_displayHP = {
        index = 0, click_function = 'customSetHP', function_owner = self, label = '',
        position = {0,0.1,0}, width = 600, height = 600, font_size = 500
    }
    b_plusHP = {
        click_function = 'increaseHP', function_owner = self, label =  '+1',
        position = {0.75,0.1,0.26}, width = 150, height = 300, font_size = 100
    }
    b_minusHP = {
        click_function = 'decreaseHP', function_owner = self, label =  '-1',
        position = {-0.75,0.1,0.26}, width = 150, height = 300, font_size = 100
    }
    b_plusHP5 = {
        click_function = 'increaseHP5', function_owner = self, label =  '+5',
        position = {0.75,0.1,-0.29}, width = 150, height = 230, font_size = 100
    }
    b_minusHP5 = {
        click_function = 'decreaseHP5', function_owner = self, label =  '-5',
        position = {-0.75,0.1,-0.29}, width = 150, height = 230, font_size = 100
    }
end