Tft.drawRect()

tft.drawRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color)

• Effect:
  

Draw a square outline on the TFT screen

• Parameters:
  

x：x coordinate of the starting point

y：y coordinate of the starting point

w：the length of the square

h：the width of the square

color：the color of the square

• Example:
  

#define sclk 13
#define mosi 11
#define cs   5
#define dc   4
#define rst  -1  // you can also connect this to the Arduino reset

#include <Adafruit_GFX.h>    // Core graphics library
#include <Adafruit_ST7735.h> // Hardware-specific library
#include <SPI.h>

#if defined(__SAM3X8E__)
    #undef __FlashStringHelper::F(string_literal)
    #define F(string_literal) string_literal
#endif

Adafruit_ST7735 tft = Adafruit_ST7735(cs, dc, mosi, sclk, rst);

void setup(void) {
  tft.initR(INITR_BLACKTAB);   // initialize a ST7735S chip, black tab
  tft.fillScreen(ST7735_BLACK);
  tft.drawRect(20, 50, 40, 20, ST7735_BLUE);
}

void loop() {  }

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