Graph a single line from analog read in a TFT

Projects Programming
8

going to flicker without a sprite or canvas and hope you're using something with a bit of ram like esp32..

#include <Adafruit_GFX.h> // Hardware-specific library
#include <Adafruit_ST7796S.h>
#include <vector>

#define display_CS 10
#define display_RST 8
#define display_DC 9
#define display_MOSI 11
#define display_CLK 13

Adafruit_ST7796S display(display_CS, display_DC, display_MOSI, display_CLK, display_RST);


#define BLACK   0x0000
#define BLUE    0x001F
#define RED     0xF800
#define GREEN   0x07E0
#define CYAN    0x07FF
#define MAGENTA 0xF81F
#define YELLOW  0xFFE0
#define WHITE   0xFFFF

int xPos = 0, xPosPrev = 0;
int n = 0;
int graphHeightPrev = 0;
int border = 20;
int sampleCount = 480 - border;

std::vector<int> v;

int16_t ht = 16, top = 3, line, lines = 15, scroll;

void setup() {
  Serial.begin(9600);
  Serial.print("Oih !");
  display.init(320, 480, 0, 0, ST7796S_BGR);  //screen size 74 x 284
  display.invertDisplay(1);
  display.fillScreen(BLACK);
  display.setRotation(1);
  display.setTextColor(WHITE);
  display.drawLine(12, 60, 12, 260, WHITE);
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(20, 40);
  display.print("value");
  display.setCursor(20, 270);
  display.print("value");
  display.setCursor(display.width() / 2 - 10, display.height() / 2);
  display.print("Buffering..");

}

void loop() {
  int sensor = random(200); // for testing
  //map the test values into screen cords..
  int graphHeight = map(sensor, 1, 200, 60, 260);
  //add to the end of the vector..
  v.push_back(graphHeight);
  //have too many, remove first..
  if (v.size() > sampleCount) v.erase(v.begin());
  //is it time to draw..
  if (v.size() == sampleCount)
  {
    xPos = 20;
    xPosPrev = 20;
    graphHeightPrev = 100;
    //clear out old graph..
    display.fillRect(20, 58, 460, 204, BLACK);
    //draw all line in the vector..
    for ( int n : v)
    {
      graphHeight = n;
      display.drawLine(xPosPrev, display.height() - graphHeightPrev, xPos, display.height() - graphHeight, WHITE);
      graphHeightPrev = graphHeight;
      xPosPrev = xPos;
      xPos++;
    }
  }
  delay(100);
}

untested sorry..~q