Component: Display Manager (Graphical Library)

Author	MatrixTSL
Version	2.0
Category	Graphical Library

Display Manager component

A component designed to simplify the process of drawing primitives and text onto a graphical display. Keeps track of coordinates so you don't have to. Also works great as a base layer for gLCD based games as it will check for collisions and perform movement.

Detailed description

The component can create the follow objects.

• Type_Line - 2 - A simple straight line.
• Type_Rectangle - 1 - A simple rectangular box.
• Type_RectangeFilled - 5 - A filled rectangular box.
• Type_Ellipse - 3 - A simple ellipse or circle.
• Type_EllipseFilled - 4 - A filled ellipse or circle.
• Type_TextBox - 0 - A text area allowing a line of text to be displayed.

The type can be entered by using the component's public constants. Begin with the Display Manager handle name followed by :: and the list of the public variables will be displayed.

For example... DisplayManager1::Type_TextBox

Examples

An example showing how to use the display manager with a GLCd and a touch interface to create a full HMI.

The example shows how to create a simple menu system as well as a toggle switch and a slider used to control a PWM output.

Display Manager Demo

Macro reference

CheckForTouch

	CheckForTouch
Uses the X and Y coordinates from a touch sensor to check for button presses. Returns 0 for no buttons pressed. Returns 1 for a valid button press. The ID of the pressed item can be found by calling GetButtonID macro. Any touched slider buttons will automatically move their thumb and value to the touch position.
- UINT	X
- UINT	Y
- BOOL	Return

ClearAll

	ClearAll
Removes all objects and buttons from memory. Also clears the screen if required.
- BOOL	ClearScreen
0=Don't clear the screen, 1=Clear the screen
- VOID	Return

CreateButton

	CreateButton
Define an interactive button or slider. Returns the Button ID.
- BYTE	ButtonType
0=ButtonHidden, 1=ButtonRect, 2=ButtonRoundedRect, 3=ButtonEllipse, 4=VSlider, 5=HSlider, 6=VSliderRound, 7=HSliderRound
- UINT	X
X Pixel Coordinate
- UINT	Y
Y Pixel Coordinate
- UINT	Width
Pixel Width or X Radius
- UINT	Height
Pixel Height or Y Radius
- BYTE	Theme
Theme index to use to draw the button
- BOOL	DrawButton
0=Do not draw button yet, 1=Draw button now
- UINT	Return

CreateObject

	CreateObject
Define a none touchable graphical object. Returns the Object ID.
- BYTE	ObjectType
0=Hidden, 1=Rect, 2=Line, 3=Ellipse, 4=FilledEllipse, 5=FilledRect
- UINT	X
X Pixel Coordinate
- UINT	Y
Y Pixel Coordinate
- UINT	Width
Pixel Width or X Radius
- UINT	Height
Pixel Height or Y Radius
- BYTE	Theme
Theme index to use to draw the object
- BOOL	DrawObject
0=Do not draw object yet, 1=Draw object now
- UINT	Return

DrawAll

	DrawAll
Redraws all of the defined Objects and Buttons. Doesn't draw text, this is done using the SetText macro.
- VOID	Return

DrawItem

	DrawItem
Draws a single object or button onto the display without clearing the display. Doesn't draw a textfield component, this is done using the SetObjectText macro.
- UINT	ID
Unique ID of the Object or Button
- VOID	Return

GetLastTouchID

	GetLastTouchID
Gets the ID of the last button that returned a valid press via the CheckForTouch macro. Returns -1 for valid touch recorded.
- INT	Return

GetSliderValue

	GetSliderValue
Reads the value of one of the sliders ranging between 0 and 1.
- UINT	ButtonID
- FLOAT	Return

Initialise

	Initialise
Initialises the object and button control variables and sets up the default themes.
- VOID	Return

ModifyPosition

	ModifyPosition
Moves an existing object or button to absolute coordinates on the screen.
- UINT	ID
Unique ID of the object or button
- INT	X
- INT	Y
- BOOL	Relative
0=Absolute Positioning, 1=Relative Positioning
- VOID	Return

ModifyScale

	ModifyScale
Changes the width and height of the selected Object or Button.
- UINT	ID
Unique ID of the object or button
- UINT	Width
- UINT	Height
- VOID	Return

ModifyTheme

	ModifyTheme
Changes the theme index of the selected Object or Button.
- UINT	ID
Unique ID of the object or button
- BYTE	Theme
Theme index of the button or object
- VOID	Return

NoTouch

	NoTouch
Called when no touch is present, Allows the repeat rate counter to be cleared allowing for better responses to fast touches.
- VOID	Return

OverrideButtonTheme

	OverrideButtonTheme
Overrides the colour of a button theme, used by the draw button macro.
- BYTE	ThemeIndex
Index of the object colour theme
- BYTE	FG_R
Foreground colour channel value
- BYTE	FG_G
Foreground colour channel value
- BYTE	FG_B
Foreground colour channel value
- BYTE	BG_R
Background colour channel value
- BYTE	BG_G
Background colour channel value
- BYTE	BG_B
Background colour channel value
- BYTE	HL_R
Highlight colour channel value
- BYTE	HL_G
Highlight colour channel value
- BYTE	HL_B
Highlight colour channel value
- BYTE	LL_R
Lowlight colour channel value
- BYTE	LL_G
Lowlight colour channel value
- BYTE	LL_B
Lowlight colour channel value
- VOID	Return

OverrideObjectTheme

	OverrideObjectTheme
Overrides the colour of an object theme, used by the draw object macro.
- BYTE	ThemeIndex
Index of the object colour theme
- BYTE	FG_R
Foreground colour channel value
- BYTE	FG_G
Foreground colour channel value
- BYTE	FG_B
Foreground colour channel value
- BYTE	BG_R
Background colour channel value
- BYTE	BG_G
Background colour channel value
- BYTE	BG_B
Background colour channel value
- VOID	Return

SetSliderValue

	SetSliderValue
Sets the value of one of the sliders and optionally redraws the slider to reflect the value change.
- UINT	ButtonID
- FLOAT	Value
Range: 0 to 1
- BOOL	RedrawSlider
0=Do not redraw, 1=Redraw
- VOID	Return

SetText

	SetText
Draws a single line of text onto an object or button location. Useful for labelling buttons or having name, value statistics. Drawn using the object themes.
- UINT	ID
Unique identifier of object or button.
- STRING	Text
- BYTE	Font
- BYTE	HAlignment
0=Left, 1=Center, 2=Right
- BYTE	VAlignment
0=Top, 1=Middle, 2=Bottom
- BYTE	Theme
Object theme index to control the colour of the text
- BOOL	Transparent
0=Background Colour Drawn, 1=Don't Draw Background Colour
- VOID	Return

Property reference

	Properties
	LinkTo
	Ram Usage Bytes
The calculated number of bytes of RAM required by the display manager.
	Text Align Offset
Number of pixels to move away from an edge when calling SetText
	Objects
	Max Objects
The total number of primitive objects allowed on the screen at once. Sets the size of the RAM buffers used to track the various screen elements. Each object requires 10 bytes of RAM to stores things like size, location and type.
	Object Theme Count
Sets the number of themes available when drawing primitive objects. Each object theme requires 6 bytes of RAM to store the colour channels.
	Theme 0
	Foreground
Foreground colour of the theme
	Background
Background colour of the theme
	Theme 1
	Foreground
Foreground colour of the theme
	Background
Background colour of the theme
	Buttons
	Max Buttons
The total number of touchable interactibe objects allowed on the screen at once e.g. buttons and sliders. Sets the size of the RAM buffers used to track the various screen elements Each button requires 18 bytes of RAM to stores things like size, location, value and type.
	Touch Repeat Rate
Sets the period for touch repeats in terms of calls of the CheckForTouch macro. Buttons will only register a repeat touch after x calls if continually held down. Sliders will always register a touch. The touch count can be cleared using the NoTouch macro if no touch is detected.
	Slider Thumb Width
Number of pixels wide to make a slider thumb marker,
	Slider Center Line Thickness
Number of pixels thick to draw the slider central line
	Button Theme Count
Sets the number of themes available for drawng buttons. Each button theme requires 12 bytes of RAM to store the colour channels.
	Theme 0
	Foreground
Foreground colour of the theme
	Background
Background colour of the theme
	Highlight
Highlight colour of the theme
	Lowlight
Lowlight colour of the theme
	Theme 1
	Foreground
Foreground colour of the theme
	Background
Background colour of the theme
	Highlight
Highlight colour of the theme
	Lowlight
Lowlight colour of the theme

Component Source Code

Please click here to download the component source project: FC_Comp_Source_Lib_DisplayManager.fcfx

Please click here to view the component source code (Beta): FC_Comp_Source_Lib_DisplayManager.fcfx