setPixel method

void setPixel(int px, int py, bool value, { bool antiAliased = false, Style? cellStyle, })

Sets pixel at (px, py) relative to canvas coordinates.

px ranges from 0 to width * 2 - 1. py ranges from 0 to height * 4 - 1.

Implementation

void setPixel(
  int px,
  int py,
  bool value, {
  bool antiAliased = false,
  Style? cellStyle,
}) {
  final cx = px ~/ 2;
  final cy = py ~/ 4;
  if (cx < 0 || cx >= width || cy < 0 || cy >= height) return;

  final dx = px % 2;
  final dy = py % 4;
  final mask = _dotMasks[(dy << 1) | dx];

  final idx = cy * width + cx;
  if (value) {
    _grid[idx] |= mask;
  } else {
    _grid[idx] &= ~mask;
  }

  if (antiAliased) {
    _antiAliased[idx] = 1;
  }

  if (cellStyle != null) {
    _styles[idx] = cellStyle;
  }
}