paddy.lua

--[[
 paddy - an onscreen controller display for touch enabled devices


 * Copyright (C) 2017 Ricky K. Thomson
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * u should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 --]]

paddy = {}
paddy.debug = true

-- The size of the buttons which can be pressed.
paddy.buttonw = 50
paddy.buttonh = 50


-- This lists any buttons which are currently being pressed
paddy.touched = {}

-- Create a dpad widget
paddy.dpad = {}

-- The properties of the canvas to draw
paddy.dpad.w = paddy.buttonw*3
paddy.dpad.h = paddy.buttonh*3
paddy.dpad.x = 20
paddy.dpad.y = love.graphics.getHeight()-20-paddy.dpad.h
paddy.dpad.canvas = love.graphics.newCanvas(paddy.dpad.w,paddy.dpad.h)

-- These just make things look prettier
paddy.dpad.opacity = 200
paddy.dpad.padding = 5

-- Setup the names for the buttons, and their position on the canvas
paddy.dpad.buttons = {
	{ name="up",   x=paddy.buttonw, y=0 },
	{ name="left", x=0, y=paddy.buttonh },
	{ name="right",x=paddy.buttonw*2, y=paddy.buttonh },
	{ name="down", x=paddy.buttonw, y=paddy.buttonh*2 },
}


-- Create a buttons widget
paddy.buttons = {}

-- The properties of the canvas to draw
paddy.buttons.w = paddy.buttonw*3
paddy.buttons.h = paddy.buttonh*3
paddy.buttons.x = love.graphics.getWidth()-20-paddy.buttons.w
paddy.buttons.y = love.graphics.getHeight()-20-paddy.buttons.h
paddy.buttons.canvas = love.graphics.newCanvas(paddy.buttons.w,paddy.buttons.h)

-- These just make things look prettier
paddy.buttons.opacity = 200
paddy.buttons.padding = 5

-- Setup the names for the buttons, and their position on the canvas
paddy.buttons.buttons = {
	{ name="y", x=paddy.buttonw, y=0 },
	{ name="x", x=0, y=paddy.buttonh },
	{ name="b", x=paddy.buttonw*2, y=paddy.buttonh },
	{ name="a", x=paddy.buttonw, y=paddy.buttonh*2 },
}

-- Stores any widgets containing interactive buttons
paddy.widgets = { paddy.dpad, paddy.buttons }


function paddy.draw()
	-- Draw the control pad
	for _,widget in ipairs(paddy.widgets) do
		love.graphics.setColor(0.607,0.607,0.607,0.196)
		love.graphics.circle("fill", widget.x+widget.w/2,widget.y+widget.h/2,widget.w/2)

		love.graphics.setCanvas(widget.canvas)
		love.graphics.clear()
	
		love.graphics.setColor(0.607,0.607,0.607,1)
	

		for _,button in ipairs(widget.buttons) do
			if button.isDown then
				love.graphics.setColor(0.607,0.607,0.607,1)
				love.graphics.rectangle("fill", 
					button.x+widget.padding, 
					button.y+widget.padding, 
					paddy.buttonw-widget.padding*2, 
					paddy.buttonh-widget.padding*2,
					10
				)
			else
				love.graphics.setColor(0.607,0.607,0.607,0.784)	
				love.graphics.rectangle("line", 
					button.x+widget.padding, 
					button.y+widget.padding, 
					paddy.buttonw-widget.padding*2, 
					paddy.buttonh-widget.padding*2,
					10
				)
			end
			
			
			-- Temporary code until  button naming can be improved
			if paddy.debug then
				love.graphics.setColor(1,1,1,1)
				
				local font = love.graphics.newFont(20)
				love.graphics.setFont(font)
				local str = button.name
				

				
				love.graphics.printf(
					button.name, 
					button.x+paddy.buttonw/2,
					button.y+paddy.buttonh/2, 
					font:getWidth(str),
					"center"
				)
			end
		end
	
		love.graphics.setCanvas()
		love.graphics.setColor(1,1,1,widget.opacity)
		love.graphics.draw(widget.canvas, widget.x, widget.y)
	end
	
	
	-- debug related
	if paddy.debug then
		for _,id in ipairs(paddy.touched) do
			local x,y = love.touch.getPosition(id)
			love.graphics.circle("fill",x,y,20)
		end
	end

end

function paddy.isDown(key)
	-- Check for any buttons which are currently being pressed
	for _,widget in ipairs(paddy.widgets) do
		for _,button in ipairs(widget.buttons) do
			if button.isDown and button.name == key then return true end
		end
	end
end

function paddy.update(dt)
	-- Decide which buttons are being pressed based on a 
	-- simple collision, then change the state of the button

	paddy.touched = love.touch.getTouches()
	
 	for _,widget in ipairs(paddy.widgets) do
		for _,button in ipairs(widget.buttons) do
			button.isDown = false
			for _,id in ipairs(paddy.touched) do	
				local tx,ty = love.touch.getPosition(id)
				if  tx >= widget.x+button.x 
				and tx <= widget.x+button.x+paddy.buttonw 
				and ty >= widget.y+button.y 
				and ty <= widget.y+button.y+paddy.buttonh then
					button.isDown = true
				end
			end
		end
	end
end


return paddy