indexing

	description: "[

		Represents a panel for the current status of all axes

	]"
	date: "$Date$"
	revision: "$Revision$"

class JOYSTICK_AXIS_PANEL

inherit

	EM_PANEL
		redefine
			draw_body
		end

create

	make

feature {NONE} -- Initialization

	make (panel_width, panel_height: INTEGER) is
			-- Initialise with a drawing panel of size `panel_width' `panel_height'.
		local
			label: EM_LABEL
		do
			Bitmap_factory.create_empty_bitmap (panel_width, panel_height)
			check
				image_crated: Bitmap_factory.last_bitmap /= Void
			end

			image := bitmap_factory.last_bitmap
			image.fill (background_color)

			make_from_dimension (panel_width, panel_height)

			-- container for sotring the actual axis position
			create axis_values.make (0, 15) -- default values
			create drawing_color.make_with_rgb (255,0,0)
			create black_color.make_black

			-- create x/y axis label
			create label.make_from_text ("X Axis / Y Axis")
			label.set_position (5, 15)
			label.set_dimension (131, label.optimal_height)
			label.align_center
			add_widget (label)

			-- create cobobox and add it to the panel
			create combobox.make_empty
			combobox.set_position (140, 15)
			add_widget (combobox)

			-- add to the `current' and handle axis events
			joystick_focus.add_focus (current)
			joystick_axis_event.subscribe (agent handle_joystick_axis_event (?))
		ensure
			image_created: image /= Void
		end

feature -- Access

	image: EM_BITMAP
			-- Bitmap that holds drawing

	background_color: EM_COLOR is
			-- Background color of panel
		once
			create result.make_white
		end

	set_axis_count (a_count: INTEGER) is
			-- setup the number of axis for this event
		require
			enough_axis: a_count >= 2 or a_count = 0
					-- there is no joystick with 1 axis
					-- 0 axis defined no joystick found (or not seleceted yet)
		local
			i: INTEGER
		do
			-- create axis_values and wipe out the combobox
			create axis_values.make (0, a_count -1)
			combobox.wipe_out

			-- fill combobox with all avaiable axis
			from
				i := 2
			until
				i = a_count or
				a_count = 0
			loop
				combobox.put ("Axis #" + i.out)
				i := i + 1
			end

			-- set dimension
			combobox.set_dimension (75, combobox.optimal_height)

			if combobox.count > 0 then
				combobox.set_selected_index (1)
				combobox.enable
			else
				-- select optimal height if empty
				combobox.put ("No Axis")
				combobox.set_height (combobox.optimal_height)
				combobox.set_selected_index (1)
				combobox.disable
			end
		end

feature -- Drawing

	draw_body is
			-- Draw the body of the widget.
		local
			pos_x, pos_y, pos: INTEGER
		do
			-- first draw the background
			surface.blit_surface (image, 0, 0)

			-- draw only something else if needed
			if combobox.selected_index /= 0 then
				surface.set_drawing_color (black_color)
				surface.draw_rectangle (create {EM_ORTHOGONAL_RECTANGLE}.make_from_coordinates (4, 34, 135,165))

				if axis_values.count >= 2 then
					pos_x := 70 + (axis_values.item (0) // 512)
					pos_y := 100 + (axis_values.item (1) // 512)

					surface.set_drawing_color (drawing_color)

					-- standard X/Y-Axis
					surface.draw_rectangle (create {EM_ORTHOGONAL_RECTANGLE}.make_from_coordinates (70, 95, pos_x, 105))
					surface.draw_rectangle (create {EM_ORTHOGONAL_RECTANGLE}.make_from_coordinates (65, 100, 75, pos_y))

					-- draw selected axis from the combobox
					pos := 100 + (axis_values.item (combobox.selected_index + 1) // 512)
					surface.draw_rectangle (create {EM_ORTHOGONAL_RECTANGLE}.make_from_coordinates (175, 100, 185, pos))

					-- crosshair
					surface.set_drawing_color (black_color)
					surface.draw_line_segment (create {EM_VECTOR_2D}.make (pos_x -5, pos_y), create {EM_VECTOR_2D}.make (pos_x +5, pos_y))
					surface.draw_line_segment (create {EM_VECTOR_2D}.make (pos_x, pos_y -5), create {EM_VECTOR_2D}.make (pos_x, pos_y +5))
				end
			end
		end

feature {JOYSTICK_SCENE} -- Joystick Management

	handle_joystick_axis_event (event: EM_JOYSTICK_AXIS_EVENT) is
			-- Handle joystick axis event
		do
			axis_values.put (event.value, event.is_axis)
			set_changed
		end

feature {NONE} -- Implementation

	axis_values: ARRAY [INTEGER]
			-- container for all axis values

	combobox: EM_COMBOBOX [STRING]
			-- Selector for axis 3..axis_values.count

	drawing_color: EM_COLOR
			-- color to draw

	black_color: EM_COLOR
			-- black color for drawing

end