OkamiMap/svgtest.html at master · dshepsis/OkamiMap · GitHub

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<!DOCTYPE HTML>

<html lang="en">
<head>
  <meta charset="utf-8">

  <title>Okami Map - Test</title>
  <meta name="description" content="Map of treasure, clovers, etc. in Okami">
  <meta name="author" content="Daniel Shepsis">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <!--Favicon.io-->
  <link rel="apple-touch-icon" sizes="180x180" href="./apple-touch-icon.png">
  <link rel="icon" type="image/png" sizes="32x32" href="./favicon-32x32.png">
  <link rel="icon" type="image/png" sizes="16x16" href="./favicon-16x16.png">
  <link rel="manifest" href="./site.webmanifest">

<style>
* {
  font: 20px/1.5 sans-serif;
  color: #222;
  box-sizing: border-box;
}
html {
  background: #f8f8f8;
  height:100%;
  margin: 0;
}
body {
  margin: 0;
  height: 100%;
}
svg {
  height: 500px;
  width: 500px;
  margin: 0;
  display: block;
  border: 5px dotted black;
}

svg.dragging {
  cursor: all-scroll;
}
</style>
</head>

<body>
  <svg tabindex="0" viewBox="0 0 10 10" xmlns="http://www.w3.org/2000/svg">
    <g id="matrix-group">
      <rect fill="#f0f3" x="0" y="0" width="10" height="10" />
      <rect fill="#ff03" stroke="green" stroke-width="0.2" x="-5" y="-5" width="16" height="16" />
      <circle cx="5" cy="5" r="5"/>
      <circle fill="red" cx="5" cy="3" r="3"/>
      <rect fill="orange" x="2.5" y = "2.5" width="2.5" height="2.5" />
      <rect fill="purple" x="5" y = "5" width="2.5" height="2.5" />
    </g>
  </svg>

<script>

//Credit http://www.petercollingridge.co.uk/tutorials/svg/interactive/dragging/
function getMousePosition(ev, svg) {
  const CTM = svg.getScreenCTM();
  return {
    x: (ev.clientX - CTM.e) / CTM.a,
    y: (ev.clientY - CTM.f) / CTM.d
  };
}


/* Normalize bounds so that they are defined by a top-left and bottom-right
 * corner: (lx, ly) and (rx, ry) respectively. */
function normalizeAndValidateBounds(bounds) {
  if (bounds === null) return {
    lx: -Infinity,
    rx: Infinity,
    width: Infinity,
    ly: -Infinity,
    ry: Infinity,
    height: Infinity
  };

  if (bounds.lx === undefined) bounds.lx = bounds.x;
  if (bounds.ly === undefined) bounds.ly = bounds.y;

  /* Checks the bounds in a single dimension: */
  function validateInterval(bounds, lName, rName, wName) {
    const lb = bounds[lName];
    if (lb === Infinity) throw new Error(
      `${lName} bound may be -Infinity, but must not be +Infinity.`
    );
    const rb = bounds[rName];
    if (rb === -Infinity) throw new Error(
      `${rName} bound may be +Infinity, but must not be -Infinity.`
    );
    const width = bounds[wName];
    if (width === -Infinity) throw new Error(
      `${wName} bound may be +Infinity, but must not be -Infinity.`
    );

    if (isFinite(width)) {
      if (lb === -Infinity || rb === Infinity) {
        throw new Error(
          `${wName} cannot by finite if ${lName} or ${rName} are infinite.`
        )
      }
      if (isFinite(lb)) {
        if (isFinite(rb)) {
          /* Defining all 3 bounds is okay if they agree exactly: */
          if (rb !== width + lb) throw new Error(
            `${lName}, ${wName}, and ${rName} are all finite, but do not agree.`
          );
        } else {
          bounds[rName] = lb + width;
        }
      } else {
        if (!isFinite(rb)) throw new Error(
          `If ${wName} is finite, ${lName} or ${rName} must be defined.`
        );
        bounds[lName] = rb - width;
      }
    } else {
      const lFinite = isFinite(lb);
      const rFinite = isFinite(rb);
      if (lFinite && rFinite) {
        if (width === Infinity) throw new Error(
          `${wName} cannot be Infinity if ${lName} and ${rName} are finite.`
        );
        bounds[wName] = rb - lb;
      } else {
        /* If width is undefined, and lb or rb (or both) are undefined,
         * width is effectively infinite */
        bounds[wName] = Infinity;
        /* Set undefined bounds as infinite: */
        bounds[lName] = lFinite ? lb : -Infinity;
        bounds[rName] = rFinite ? rb : Infinity;
      }
    }
  }
  validateInterval(bounds, 'lx', 'rx', 'width');
  validateInterval(bounds, 'ly', 'ry', 'height');
  return bounds;
}

/**
 * Takes a given <g> element within a parent SVG element, and makes the parent
 * interactive, such that clicking/tapping and dragging within the parent
 * applies transforms to the <g> to simulate panning around within the given
 * bounds (or with no bounds, if they're not given), and scrolling or pinching/ * stretching zooms in and out about the pointer(s).
 *
 * The expected use is to wrap all the contents of an <svg> within a <g>, so
 * that the
 */
var movTemp;
function makeSVGExplorable({
  g, //Required. The <g> element to apply transforms to.
  svg = g.ownerSVGElement, //Optional. Captures pan/zoomevents
  bounds = svg.getBBox(), //Optional. Use null for no bounds.
  minScale = 0.01, //Optional. Use 0 for no minimum.
  maxScale = 100, //Optional. Use Infinity for no maximum.
} = {}) {
  normalizeAndValidateBounds(bounds);

  const transform = svg.createSVGTransform();
  g.transform.baseVal.insertItemBefore(transform, 0);
  const tMat = transform.matrix;
  const initViewBox = svg.viewBox.baseVal;

  /**
   * The effective position and dimensions of the viewbox, relative to the
   * initial svg frame.
   */
  function effectiveViewBox() {
    return {
      x: initViewBox.x - tMat.e / tMat.a,
      y: initViewBox.y - tMat.f / tMat.d,
      width: initViewBox.width / tMat.a,
      height: initViewBox.height / tMat.d
    };
  // right bounds: x + width <= bounds.lx + bounds.width
  //              initViewBox.x - tMat.e / tMat.a + initViewBox.width / tMat.a <= bounds.lx + bounds.width
  //              tMat.e / tMat.a >= initViewBox.x + initViewBox.width / tMat.a - bounds.lx - bounds.width
  //              tMat.e >= (initViewBox.x - bounds.lx - bounds.width) * tMat.a + initViewBox.width
  // left bounds: x >= bounds.lx
  //             initViewBox.x - tMat.e / tMat.a >= bounds.lx
  //             tMat.e / tMat.a <= initViewBox.x - bounds.lx
  //             tMat.e <= (initViewBox.x - bounds.lx) * tMat.a
  }

  gls = svg;
  function clamp(n, min, max) {
    if (min > max) {
      let temp = min;
      min = max;
      max = temp;
      // throw new Error(`Minimum ${min} greater than maximum ${max}.`);
    }
    if (n < min) return min;
    if (n > max) return max;
    return n;
  }

  function translationBounds(dimName, scaleName, wName) {
    const leftBound = bounds['l' + dimName];
    const rightBound = bounds['r' + dimName];
    if (leftBound === -Infinity && rightBound === Infinity) {
      return [-Infinity, Infinity];
    }

    let minTranslate, maxTranslate;

    const viewXY = initViewBox[dimName];
    const curScale = tMat[scaleName];
    const viewWH = initViewBox[wName];
    if (rightBound === Infinity) minTranslate = -Infinity;
    else minTranslate = (viewXY - rightBound) * curScale + viewWH;
    if (leftBound === -Infinity) maxTranslate = Infinity;
    else maxTranslate = (viewXY - leftBound) * curScale

    return [minTranslate, maxTranslate];
  }
  /**
   * Translates <g> such that the effectiveViewBox has the given x and y (top
   * left corner). Obeys the given bounds.
   */
  function panAbsolute({x = -tMat.e, y = -tMat.f} = {}) {
    if (bounds === null) {
      tMat.e = -x;
      tMat.f = -y;
      return;
    }
    tMat.e = clamp(-x, ...translationBounds('x', 'a', 'width'));
    tMat.f = clamp(-y, ...translationBounds('y', 'd', 'height'));
  }
  /**
   * Translates <g> such that the effectiveViewBox is moved dx to the right and * dy downward. Obeys the given bounds.
   */
  function panRelative({dx = 0, dy = 0} = {}) {
    if (bounds === null) {
      tMat.e = -x;
      tMat.f = -y;
      return;
    }
    tMat.e = clamp(tMat.e - dx, ...translationBounds('x', 'a', 'width'));
    tMat.f = clamp(tMat.f - dy, ...translationBounds('y', 'd', 'height'));
  }

  function zoomRelative({scaleMul, cx, cy}) {
    if (isNaN(scaleMul)) {
      throw new Error(`scaleMul must be a number. Instead, found ${scaleMul}.`);
    }
    let minAD, maxAD;
    if (tMat.a < tMat.d) {
      minAD = tMat.a;
      maxAD = tMat.d;
    } else {
      minAD = tMat.d;
      maxAD = tMat.a;
    }
    scaleMul = clamp(scaleMul, minScale / maxAD, maxScale / minAD);
    tMat.a *= scaleMul;
    tMat.d *= scaleMul;

    //I don't actually know if this works with different a and d
    tMat.e = (1 - scaleMul) * cx + scaleMul * tMat.e;
    tMat.f = (1 - scaleMul) * cy + scaleMul * tMat.f;
  }
  function zoomAbsolute({scale, cx, cy}) {
    scale = clamp(scale, minScale, maxScale);
    //I don't actually know if this works with different a and d
    const scaleMulX = scale / tMat.a;
    const scaleMulY = scale / tMat.d;
    tMat.a = tMat.d = scale;
    tMat.e = (1 - scaleMulX) * cx + scaleMulX * tMat.e;
    tMat.f = (1 - scaleMulY) * cy + scaleMulY * tMat.f;
  }

  let dragging = false;
  window.dragStart = null;
  // window.movTemp = dragStart;
  const pointers = new Map();
  window.pss = pointers;
  function pointPos(index) {
    const values = Array.from(pointers.values());
    const pointer = values[index];
    return getMousePosition(pointer, svg);
  }
  function downHandler(ev) {
    dragging = true;
    pointers.set(ev.pointerId, ev);
    if (pointers.size === 1) {
      dragStart = pointPos(0);
      dragStart.x -= tMat.e;
      dragStart.y -= tMat.f;
    } else if (pointers.size === 2) {
      const [pointA, pointB] = [pointPos(0), pointPos(1)];
      dragStart = Object.create(null);

      /* The transform origin becomes the middle of the two pointers: */
      dragStart.x = (pointA.x + pointB.x) / 2 - tMat.e;
      dragStart.y = (pointA.y + pointB.y) / 2 - tMat.f;

      dragStart.dist = Math.hypot(pointA.x - pointB.x, pointA.y - pointB.y);
      dragStart.initZoom = tMat.a; //TODO: Figure out whether we're going to handle different zoom in x and y (a and d)
    } else {
      //TODO FIXME HELP: IDK what do for 3 or more fingers!!!
      console.warn("Sorry buddy idk what to do for 3+ fingers.")
    }
  }
  function upHandler(ev) {
    pointers.delete(ev.pointerId);
    if (pointers.size === 0) {
      dragging = false;
      svg.classList.remove('dragging');
    } else if (pointers.size === 1) { //TODO Fix this being duplicated from above
      const point = pointPos(0);
      dragStart = Object.create(null);
      dragStart.x = point.x - tMat.e;
      dragStart.y = point.y - tMat.f;
    } else if (pointers.size === 2) {
      // console.warn("UP");
      // console.log(uptemp = pointers);
      const [pointA, pointB] = [pointPos(0), pointPos(1)];
      dragStart = Object.create(null);

      /* The transform origin becomes the middle of the two pointers: */
      dragStart.x = (pointA.x + pointB.x) / 2 - tMat.e;
      dragStart.y = (pointA.y + pointB.y) / 2 - tMat.f;
      // console.log(dragStart);
      dragStart.dist = Math.hypot(pointA.x - pointB.x, pointA.y - pointB.y);
      dragStart.initZoom = tMat.a; //TODO: Figure out whether we're going to handle different zoom in x and y (a and d)
    } else {
      //TODO FIXME HELP: IDK what do for 3 or more fingers!!!
      console.warn("Sorry buddy idk what to do for 3+ fingers.")
    }
  }

  /* For touch screens, disable the browser's handling of touching so we can
   * implement our own behavior: */
  svg.style.touchAction = 'none';
  svg.addEventListener('pointerdown', downHandler);
  //Attach to window so that the pointer is followed even outside the <svg>
  window.addEventListener('pointerup', upHandler);
  window.addEventListener('pointermove', ev=>{
    if (dragging === false) return;
    svg.classList.add('dragging');
    pointers.set(ev.pointerId, ev);
    if (pointers.size === 1) {
      const dragCurrent = pointPos(0);
      panAbsolute({
        x: dragStart.x - dragCurrent.x,
        y: dragStart.y - dragCurrent.y
      });
    } else if (pointers.size === 2) {
      // console.warn("MOVING");
      const [pointA, pointB] = [pointPos(0), pointPos(1)];
      const dragCurrent = Object.create(null);

      /* The transform origin becomes the middle of the two pointers: */
      dragCurrent.x = (pointA.x + pointB.x) / 2; //- tMat.e;
      dragCurrent.y = (pointA.y + pointB.y) / 2; //- tMat.f;
      // console.warn("changes");
      dragCurrent.dist = Math.hypot(pointA.x - pointB.x, pointA.y - pointB.y);
      // movTemp = ev.x;
      // console.log(dragCurrent);
      zoomAbsolute({
        scale: dragCurrent.dist / dragStart.dist * dragStart.initZoom,
        cx: dragCurrent.x,
        cy: dragCurrent.y
      });
      // panAbsolute({
      //   x: dragStart.x - dragCurrent.x,
      //   y: dragStart.y - dragCurrent.y
      // });
    } else {
      //TODO FIXME HELP: IDK what do for 3 or more fingers!!!
      console.warn("Sorry buddy idk what to do for 3+ fingers.")
    }
  });

  const USE_FIXED_SCALE = false;
  svg.addEventListener('wheel', ev=>{
    ev.preventDefault();
    const factor = 0.1 * ev.deltaY;

    /* Calculate the scale such that scrolling up and down by the same number
     * of notches gives you the same zoom every time. */
    const scale = (factor > 0) ? (1 - factor) : (1 / (1 + factor));
    const scaleCenter = getMousePosition(ev, svg);
    zoomRelative({scaleMul: scale, cx: scaleCenter.x, cy: scaleCenter.y});
  });

  (()=>{
    const DBL_ZOOM = 2;
    let dblClickToggle = false;
    svg.addEventListener('dblclick', ev=>{
      const scaleCenter = getMousePosition(ev, svg);
      const scaleMul = dblClickToggle ? 1 / DBL_ZOOM : DBL_ZOOM;
      dblClickToggle = !dblClickToggle;
      zoomRelative({scaleMul, cx: scaleCenter.x, cy: scaleCenter.y});
    });
  })();
  svg.addEventListener('keydown', ev=>{
    if (ev.ctrlKey || ev.metaKey || ev.altKey) return;
    // ev.preventDefault();
    const KEY_ZOOM = 1.5;
    const KEY_PAN_FACTOR = 10;
    const vbox = initViewBox;
    let preventDefault = true;
    switch (ev.key) {
      case "w": case "W":
      case "ArrowUp":
        panRelative({dy: -vbox.height / KEY_PAN_FACTOR});
        break;
      case "s": case "S":
      case "ArrowDown":
        panRelative({dy: vbox.height / KEY_PAN_FACTOR});
        break;
      case "a": case "A":
      case "ArrowLeft":
        panRelative({dx: -vbox.width / KEY_PAN_FACTOR});
        break;
      case "d": case "D":
      case "ArrowRight":
        panRelative({dx: vbox.width / KEY_PAN_FACTOR});
        break;
      case "e": case "E":
      case "=": case "+":
        zoomRelative({
          scaleMul: KEY_ZOOM,
          cx: vbox.x + vbox.width / 2,
          cy: vbox.y + vbox.height / 2,
        });
        break;
      case "q": case "Q":
      case "-": case "_":
        zoomRelative({
          scaleMul: 1 / KEY_ZOOM,
          cx: vbox.x + vbox.width / 2,
          cy: vbox.y + vbox.height / 2,
        });
        break;
      case " ":
      case "Home":
        zoomAbsolute({
          scale: 1,
          cx: 0,
          cy: 0,
        });
        panAbsolute({x: 0, y: 0});
        break
      default:
        preventDefault = false;
    }
    if (preventDefault) ev.preventDefault();
  })

  return({
    g, svg, bounds,
    effectiveViewBox,
    panRelative, panAbsolute,
    zoomRelative, zoomAbsolute
  });
}
const g = document.getElementById('matrix-group');
const ext = makeSVGExplorable({
  g,
  // bounds:{lx: -5, ly:-5, rx: 11, height: 16},
  minScale: 0.1,
  maxScale: 10
});
</script>
</body>
</html>