pihkaal-me/app/utils/canvas.ts

export const drawLine = (
  ctx: CanvasRenderingContext2D,
  x0: number,
  y0: number,
  x1: number,
  y1: number,
  width: number,
) => {
  const dx = Math.abs(x1 - x0);
  const dy = Math.abs(y1 - y0);
  const sx = x0 < x1 ? 1 : -1;
  const sy = y0 < y1 ? 1 : -1;
  let err = dx - dy;

  const drawThickPixel = (x: number, y: number) => {
    const isVertical = dy > dx;

    if (width === 1) {
      ctx.fillRect(x, y, 1, 1);
    } else if (isVertical) {
      const offset = Math.floor((width - 1) / 2);
      ctx.fillRect(x - offset, y, width, 1);
    } else {
      const offset = Math.floor((width - 1) / 2);
      ctx.fillRect(x, y - offset, 1, width);
    }
  };

  while (true) {
    drawThickPixel(x0, y0);

    if (x0 === x1 && y0 === y1) break;

    const e2 = 2 * err;
    if (e2 > -dy) {
      err -= dy;
      x0 += sx;
    }
    if (e2 < dx) {
      err += dx;
      y0 += sy;
    }
  }
};

export const fillTextCentered = (
  ctx: CanvasRenderingContext2D,
  text: string,
  x: number,
  y: number,
  width: number,
): number => {
  const measure = ctx.measureText(text);
  const textX = Math.floor(x + width / 2 - measure.actualBoundingBoxRight / 2);
  const textY =
    measure.actualBoundingBoxAscent + measure.actualBoundingBoxDescent;
  ctx.fillText(text, textX, y + textY);
  return measure.actualBoundingBoxAscent + measure.actualBoundingBoxDescent + 1;
};

export const fillImageTextHCentered = (
  ctx: CanvasRenderingContext2D,
  image: AtlasImage,
  text: string,
  x: number,
  y: number,
  width: number,
  gap: number,
) => {
  const { actualBoundingBoxRight: textWidth } = ctx.measureText(text);
  const totalWidth = textWidth + gap + image.rect.width;
  const groupX = Math.floor(x + width / 2 - totalWidth / 2);

  image.draw(ctx, groupX, y);
  ctx.fillText(text, groupX + gap + image.rect.width, y);
};

export const fillTextHCentered = (
  ctx: CanvasRenderingContext2D,
  text: string,
  x: number,
  y: number,
  width: number,
) => {
  const measure = ctx.measureText(text);
  const textX = Math.floor(x + width / 2 - measure.actualBoundingBoxRight / 2);
  ctx.fillText(text, textX, y);
};

export const fillTextHCenteredMultiline = (
  ctx: CanvasRenderingContext2D,
  text: string,
  x: number,
  y: number,
  width: number,
  lineHeight: number,
) => {
  const lines = text.split("\n");
  for (let i = 0, y = 20; i < lines.length; i += 1, y += lineHeight) {
    fillTextHCentered(ctx, lines[i]!, 0, y, width);
  }
};

export const CHECKBOX_SIZE = 7;
export const CHECKBOX_TEXT_GAP = 5;

export const drawCheckbox = (
  ctx: CanvasRenderingContext2D,
  x: number,
  y: number,
  checked: boolean,
) => {
  ctx.fillRect(x, y, CHECKBOX_SIZE, 1);
  ctx.fillRect(x, y + CHECKBOX_SIZE - 1, CHECKBOX_SIZE, 1);
  ctx.fillRect(x, y + 1, 1, CHECKBOX_SIZE - 2);
  ctx.fillRect(x + CHECKBOX_SIZE - 1, y + 1, 1, CHECKBOX_SIZE - 2);

  if (checked) {
    for (let i = 2; i < CHECKBOX_SIZE - 2; i++) {
      ctx.fillRect(x + i, y + i, 1, 1);
      ctx.fillRect(x + CHECKBOX_SIZE - 1 - i, y + i, 1, 1);
    }
  }
};

export const fillCirclePixelated = (
  ctx: CanvasRenderingContext2D,
  cx: number,
  cy: number,
  radius: number,
) => {
  const r = Math.floor(radius);
  for (let dy = -r; dy <= r; dy++) {
    for (let dx = -r; dx <= r; dx++) {
      if (dx * dx + dy * dy <= r * r) {
        ctx.fillRect(Math.floor(cx) + dx, Math.floor(cy) + dy, 1, 1);
      }
    }
  }
};

export const strokeCirclePixelated = (
  ctx: CanvasRenderingContext2D,
  cx: number,
  cy: number,
  radius: number,
  thickness: number = 2,
) => {
  const outerR = Math.floor(radius);
  const innerR = Math.floor(radius - thickness);
  for (let dy = -outerR; dy <= outerR; dy++) {
    for (let dx = -outerR; dx <= outerR; dx++) {
      const distSq = dx * dx + dy * dy;
      if (distSq <= outerR * outerR && distSq > innerR * innerR) {
        ctx.fillRect(Math.floor(cx) + dx, Math.floor(cy) + dy, 1, 1);
      }
    }
  }
};

export const fillTextWordWrapped = (
  ctx: CanvasRenderingContext2D,
  text: string,
  x: number,
  y: number,
  width: number,
  lineHeight?: number,
): number => {
  const words = text.split(" ");
  let line = "";
  let currentY = y;
  let lineCount = 0;

  const height =
    lineHeight ||
    ctx.measureText("M").actualBoundingBoxAscent +
      ctx.measureText("M").actualBoundingBoxDescent;

  currentY += height;

  for (let i = 0; i < words.length; i++) {
    const testLine = line + (line ? " " : "") + words[i];
    const metrics = ctx.measureText(testLine);
    const testWidth = metrics.width;

    if (testWidth > width && line) {
      ctx.fillText(line, x, currentY);
      line = words[i]!;
      currentY += height;
      lineCount++;
    } else {
      line = testLine;
    }
  }

  if (line) {
    ctx.fillText(line, x, currentY);
    lineCount++;
  }

  return lineCount * height;
};

export const drawButton = (
  ctx: CanvasRenderingContext2D,
  text: string,
  x: number,
  y: number,
  width: number,
  pressed: boolean,
) => {
  const { assets } = useAssets((a) => a.images.common);

  const LEFT_WIDTH = assets.buttonLeft.rect.width;
  const RIGHT_WIDTH = assets.buttonRight.rect.width;
  const BODY_WIDTH = assets.buttonBody.rect.width;

  const bodySpace = width - LEFT_WIDTH - RIGHT_WIDTH;
  const bodyCount = Math.ceil(bodySpace / BODY_WIDTH);

  ctx.save();
  ctx.translate(x, y);

  (pressed ? assets.buttonLeftPressed : assets.buttonLeft).draw(ctx, 0, 0);

  for (let i = 0; i < bodyCount; i++) {
    (pressed ? assets.buttonBodyPressed : assets.buttonBody).draw(
      ctx,
      LEFT_WIDTH + i * BODY_WIDTH,
      0,
    );
  }

  (pressed ? assets.buttonRightPressed : assets.buttonRight).draw(
    ctx,
    width - RIGHT_WIDTH,
    0,
  );

  ctx.textBaseline = "top";
  ctx.font = "10px NDS10";
  ctx.fillStyle = "#494118";

  fillTextHCentered(ctx, text, 1, 4, width);

  ctx.restore();
};