paint-ui/components/canvas/rulers-and-guides.tsx

'use client';

import { useGuidesStore } from '@/store';
import { useCanvasStore } from '@/store';

interface RulersAndGuidesProps {
  canvasWidth: number;
  canvasHeight: number;
}

export function RulersAndGuides({ canvasWidth, canvasHeight }: RulersAndGuidesProps) {
  const { guides, showGuides, showRulers } = useGuidesStore();
  const { zoom, offsetX, offsetY } = useCanvasStore();

  if (!showGuides && !showRulers) return null;

  const rulerSize = 20;

  return (
    <>
      {/* Horizontal Ruler */}
      {showRulers && (
        <div
          className="absolute top-0 left-0 bg-card border-b border-border"
          style={{
            width: `${canvasWidth}px`,
            height: `${rulerSize}px`,
            marginLeft: `${rulerSize}px`,
          }}
        >
          <svg width={canvasWidth} height={rulerSize}>
            {Array.from({ length: Math.ceil(canvasWidth / (zoom * 50)) }).map((_, i) => {
              const x = i * 50 * zoom + offsetX;
              if (x < 0 || x > canvasWidth) return null;
              return (
                <g key={i}>
                  <line
                    x1={x}
                    y1={rulerSize - 5}
                    x2={x}
                    y2={rulerSize}
                    stroke="currentColor"
                    strokeWidth="1"
                    className="text-muted-foreground"
                  />
                  <text
                    x={x + 2}
                    y={rulerSize - 8}
                    fontSize="10"
                    className="text-muted-foreground fill-current"
                  >
                    {i * 50}
                  </text>
                </g>
              );
            })}
          </svg>
        </div>
      )}

      {/* Vertical Ruler */}
      {showRulers && (
        <div
          className="absolute top-0 left-0 bg-card border-r border-border"
          style={{
            width: `${rulerSize}px`,
            height: `${canvasHeight}px`,
            marginTop: `${rulerSize}px`,
          }}
        >
          <svg width={rulerSize} height={canvasHeight}>
            {Array.from({ length: Math.ceil(canvasHeight / (zoom * 50)) }).map((_, i) => {
              const y = i * 50 * zoom + offsetY;
              if (y < 0 || y > canvasHeight) return null;
              return (
                <g key={i}>
                  <line
                    x1={rulerSize - 5}
                    y1={y}
                    x2={rulerSize}
                    y2={y}
                    stroke="currentColor"
                    strokeWidth="1"
                    className="text-muted-foreground"
                  />
                  <text
                    x={2}
                    y={y - 2}
                    fontSize="10"
                    className="text-muted-foreground fill-current"
                    transform={`rotate(-90 ${2} ${y - 2})`}
                  >
                    {i * 50}
                  </text>
                </g>
              );
            })}
          </svg>
        </div>
      )}

      {/* Guides */}
      {showGuides && guides.map((guide) => (
        <div
          key={guide.id}
          className="absolute pointer-events-none"
          style={
            guide.type === 'horizontal'
              ? {
                  top: `${guide.position * zoom + offsetY}px`,
                  left: 0,
                  right: 0,
                  height: '1px',
                  backgroundColor: '#00ff00',
                  boxShadow: '0 0 2px rgba(0, 255, 0, 0.5)',
                }
              : {
                  left: `${guide.position * zoom + offsetX}px`,
                  top: 0,
                  bottom: 0,
                  width: '1px',
                  backgroundColor: '#00ff00',
                  boxShadow: '0 0 2px rgba(0, 255, 0, 0.5)',
                }
          }
        />
      ))}
    </>
  );
}