Description

Draw an anti-aliased filled circle at ax,ay with radius r. Coordinates are floating point to achieve sub-pixel positioning.

If bg_color is not included the background pixel colour will be read from TFT or sprite.

Uses drawWideLine.

Signature

void TFT::eSPI::drawSpot(float ax, float ay, float r, uint32_t fg_color, uint32_t bg_color = 0x00FFFFFF)

Parameters

• float ax: X coord center.
• float ay: Y coord center.
• float r: radius.
• uint32_t fg_color: foreground color.
• uint32_t bg_color: default to 0x00FFFFFF.

Result

None.

Example

#include <TFT_eSPI.h>

TFT_eSPI tft = TFT_eSPI();

void setup() {
  tft.init();
  tft.fillScreen(TFT_BLACK); // Clear the screen with black color
}

void loop() {
  const int x = random(tft.width()); // Generate a random x-coordinate for the center of the circle
  const int y = random(tft.height()); // Generate a random y-coordinate for the center of the circle
  tft.drawSpot(x, y, 10, TFT_RED); // Draw a red spot at (50, 50) with radius 10
  delay(1000);
}

This code initializes the TFT display, clears the screen with black color, and then draws a red spot at random coordinates with a radius of 10 pixels. The delay(1000) function is used to pause the program for 1 second between each spot drawing.