all files / src/ rect.js

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1×
 
 
 
 
 
 
import lineSegment from './lineSegment.js';
 
function rectToLineSegments (rect) {
  const top = {
    start: {
      x: rect.left,
      y: rect.top
    },
    end: {
      x: rect.left + rect.width,
      y: rect.top
 
    }
  };
  const right = {
    start: {
      x: rect.left + rect.width,
      y: rect.top
    },
    end: {
      x: rect.left + rect.width,
      y: rect.top + rect.height
 
    }
  };
  const bottom = {
    start: {
      x: rect.left + rect.width,
      y: rect.top + rect.height
    },
    end: {
      x: rect.left,
      y: rect.top + rect.height
 
    }
  };
  const left = {
    start: {
      x: rect.left,
      y: rect.top + rect.height
    },
    end: {
      x: rect.left,
      y: rect.top
 
    }
  };
  const lineSegments = [top, right, bottom, left];
 
 
  return lineSegments;
}
 
function distanceToPoint (rect, point) {
  let minDistance = 655535;
  const lineSegments = rectToLineSegments(rect);
 
  lineSegments.forEach(function (segment) {
    const distance = lineSegment.distanceToPoint(segment, point);
 
    if(distance < minDistance) {
      minDistance = distance;
    }
  });
 
  return minDistance;
}
 
// Returns top-left and bottom-right points of the rectangle
function rectToPoints (rect) {
  const rectPoints = {
    topLeft: {
      x: rect.left,
      y: rect.top
    },
    bottomRight: {
      x: rect.left + rect.width,
      y: rect.top + rect.height
    }
  };
 
  return rectPoints;
}
 
// Returns whether two non-rotated rectangles are intersected
function doesIntersect (rect1, rect2) {
  let intersectLeftRight;
  let intersectTopBottom;
 
  const rect1Points = rectToPoints(rect1);
  const rect2Points = rectToPoints(rect2);
 
  if (rect1.width >= 0) {
    if (rect2.width >= 0) {
      intersectLeftRight = !((rect1Points.bottomRight.x <= rect2Points.topLeft.x) || (rect2Points.bottomRight.x <= rect1Points.topLeft.x));
    } else {
      intersectLeftRight = !((rect1Points.bottomRight.x <= rect2Points.bottomRight.x) || (rect2Points.topLeft.x <= rect1Points.topLeft.x));
    }
  } else if (rect2.width >= 0) {
    intersectLeftRight = !((rect1Points.topLeft.x <= rect2Points.topLeft.x) || (rect2Points.bottomRight.x <= rect1Points.bottomRight.x));
  } else {
    intersectLeftRight = !((rect1Points.topLeft.x <= rect2Points.bottomRight.x) || (rect2Points.topLeft.x <= rect1Points.bottomRight.x));
  }
 
  if (rect1.height >= 0) {
    if (rect2.height >= 0) {
      intersectTopBottom = !((rect1Points.bottomRight.y <= rect2Points.topLeft.y) || (rect2Points.bottomRight.y <= rect1Points.topLeft.y));
    } else {
      intersectTopBottom = !((rect1Points.bottomRight.y <= rect2Points.bottomRight.y) || (rect2Points.topLeft.y <= rect1Points.topLeft.y));
    }
  } else if (rect2.height >= 0) {
    intersectTopBottom = !((rect1Points.topLeft.y <= rect2Points.topLeft.y) || (rect2Points.bottomRight.y <= rect1Points.bottomRight.y));
  } else {
    intersectTopBottom = !((rect1Points.topLeft.y <= rect2Points.bottomRight.y) || (rect2Points.top <= rect1Points.bottomRight.y));
  }
 
  return intersectLeftRight && intersectTopBottom;
}
 
// Returns intersection points of two non-rotated rectangles
function getIntersectionRect (rect1, rect2) {
  const intersectRect = {
    topLeft: {},
    bottomRight: {}
  };
 
  if (!doesIntersect(rect1, rect2)) {
    return;
  }
 
  const rect1Points = rectToPoints(rect1);
  const rect2Points = rectToPoints(rect2);
 
  if (rect1.width >= 0) {
    if (rect2.width >= 0) {
      intersectRect.topLeft.x = Math.max(rect1Points.topLeft.x, rect2Points.topLeft.x);
      intersectRect.bottomRight.x = Math.min(rect1Points.bottomRight.x, rect2Points.bottomRight.x);
    } else {
      intersectRect.topLeft.x = Math.max(rect1Points.topLeft.x, rect2Points.bottomRight.x);
      intersectRect.bottomRight.x = Math.min(rect1Points.bottomRight.x, rect2Points.topLeft.x);
    }
  } else if (rect2.width >= 0) {
    intersectRect.topLeft.x = Math.min(rect1Points.topLeft.x, rect2Points.bottomRight.x);
    intersectRect.bottomRight.x = Math.max(rect1Points.bottomRight.x, rect2Points.topLeft.x);
  } else {
    intersectRect.topLeft.x = Math.min(rect1Points.topLeft.x, rect2Points.topLeft.x);
    intersectRect.bottomRight.x = Math.max(rect1Points.bottomRight.x, rect2Points.bottomRight.x);
  }
 
  if (rect1.height >= 0) {
    if (rect2.height >= 0) {
      intersectRect.topLeft.y = Math.max(rect1Points.topLeft.y, rect2Points.topLeft.y);
      intersectRect.bottomRight.y = Math.min(rect1Points.bottomRight.y, rect2Points.bottomRight.y);
    } else {
      intersectRect.topLeft.y = Math.max(rect1Points.topLeft.y, rect2Points.bottomRight.y);
      intersectRect.bottomRight.y = Math.min(rect1Points.bottomRight.y, rect2Points.topLeft.y);
    }
  } else if (rect2.height >= 0) {
    intersectRect.topLeft.y = Math.min(rect1Points.topLeft.y, rect2Points.bottomRight.y);
    intersectRect.bottomRight.y = Math.max(rect1Points.bottomRight.y, rect2Points.topLeft.y);
  } else {
    intersectRect.topLeft.y = Math.min(rect1Points.topLeft.y, rect2Points.topLeft.y);
    intersectRect.bottomRight.y = Math.max(rect1Points.bottomRight.y, rect2Points.bottomRight.y);
  }
 
  // Returns top-left and bottom-right points of intersected rectangle
  return intersectRect;
 
}
 
const rect = {
  distanceToPoint,
  getIntersectionRect
};
 
export default rect;