View source for Tft.drawCircle()

<pre style="color:green">
tft.drawCircle(int16_t x0, int16_t y0, int16_t r, uint16_t color)
</pre>

*'''Effect''':<br>
Draw a circle outline on the TFT screen.<br>


*'''Parameters''':<br>
x0：x coordinate of the center point

y0：y coordinate of the center point

r：the radius of the circle

color：the color of the circle


*'''Example''':<br>
<pre style="color:green">
#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.drawCircle(40, 40, 20, ST7735_YELLOW);
}

void loop() {  }
</pre>


[[https://wiki.microduino.cc/index.php/TFT_ST7735_Grammar_Handbook Return to TFT_ST7735 Grammar Handbook]]