Polygons

Functions
void	ezLCD_draw_rect (uint16_t x2, uint16_t y2)
void	ezLCD_draw_rect_fill (uint16_t x2, uint16_t y2)
void	ezLCD_draw_polygon (uint8_t n, uint16_t x[], uint16_t y[])
void	ezLCD_set_edit_rectangle (int16_t x, int16_t y, uint16_t width, uint16_t height)

Detailed Description

This header contains functions draw polygons to the current frame. It also has a function ezLCD_set_edit_rectangle() which is used in conjunction with ezLCD_replace_color() to define a rectangular region for editing.

Function Documentation

void ezLCD_draw_polygon	(	uint8_t	n,
		uint16_t	x[],
		uint16_t	y[]
	)

Draws an n sided polygon filled with the current color. The first vertex is located at the current position.

Example of polygon drawing

Parameters

• n = The number of vertices on the polygon
• x[] = X coordinates of the verticies (exclusing the current position)
• y[] = Y coordinates of the verticies (exclusing the current position)

Assumptions

• Both arrays are filled as follows for some number i:
  • x[i] and y[i] implies that coordinate (x[i],y[i]) is a vertex of the polygon.
• The user has initialized the MCU's SPI interface with the EZLCD_INIT_SPI() macro.
• The user has set the MCU's SPI pins to inputs and outputs appropriately.
  
  
  • SS_BAR = OUTPUT
  • SCK = OUTPUT
  • MOSI = OUTPUT
  • MISO = INPUT

void ezLCD_draw_rect	(	uint16_t	x2,
		uint16_t	y2
	)

This function is used to draw an unfilled rectangle from the current position to the specified XY coordinate in the current color.

Parameters

• x2 = X coordinate of the corner opposite the current position.
• y2 = Y coordinate of the corner opposite the current position.

Assumptions

• The user has initialized the MCU's SPI interface with the EZLCD_INIT_SPI() macro.
• The user has set the MCU's SPI pins to inputs and outputs appropriately.
  
  
  • SS_BAR = OUTPUT
  • SCK = OUTPUT
  • MOSI = OUTPUT
  • MISO = INPUT

void ezLCD_draw_rect_fill	(	uint16_t	x2,
		uint16_t	y2
	)

This function is used to draw a filled rectangle from the current position to the specified XY coordinate in the current color.

Parameters

• x2 = X coordinate of the corner opposite the current position.
• y2 = Y coordinate of the corner opposite the current position.

Assumptions

• The user has initialized the MCU's SPI interface with the EZLCD_INIT_SPI() macro.
• The user has set the MCU's SPI pins to inputs and outputs appropriately.
  
  
  • SS_BAR = OUTPUT
  • SCK = OUTPUT
  • MOSI = OUTPUT
  • MISO = INPUT

void ezLCD_set_edit_rectangle	(	int16_t	x,
		int16_t	y,
		uint16_t	width,
		uint16_t	height
	)

Defines a rectangular region for editing by the ezLCD_replace_color() function.

Parameters

• x = X coordinate of the upper-left hand corner of the rectangular region.
• y = Y coordinate of the upper-left hand corner of the rectangular region.
• width = Width of the rectangular region to be edited.
• height = Height of the rectangular region to be edited.

Assumptions

• The user has initialized the MCU's SPI interface with the EZLCD_INIT_SPI() macro.
• The user has set the MCU's SPI pins to inputs and outputs appropriately.
  
  
  • SS_BAR = OUTPUT
  • SCK = OUTPUT
  • MOSI = OUTPUT
  • MISO = INPUT