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HTML

              
                .background
  each _ in Array(5)
    span
.cloud
  each _ in Array(8)
    span
//- .fps
//- .rain-count
.reset Reset
//- .debug Debug
.title mouse moves cloud ° click to rain ° FLOOD the VALLEY
.ground-grid

              
            
!

CSS

              
                @import url("https://fonts.googleapis.com/css?family=Major+Mono+Display&display=swap");

$ground: #481d13;
$density: 3.33vw;
$water: lighten(blue, 10%);

html,
body {
  height: 100%;
  width: 100%;
  overflow: hidden;
  background: #cfe3f1;
}

.title {
  user-select: none;
  position: absolute;
  font-family: "Major Mono Display", monospace;
  color: $water;
  top: 16px;
  left: 16px;
  right: 100px;
  font-size: 22px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  word-spacing: -5px;
  letter-spacing: -1.5px;
  padding-bottom: 15px;
  &::before {
    content: "";
    position: absolute;
    bottom: 0;
    opacity: 0.25;
    left: 0px;
    height: 3px;
    width: 87px;
    background: $water;
  }
}

.background {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  opacity: 0.5;

  span {
    width: 35vw;
    height: 35vw;
    background: linear-gradient(
      135deg,
      rgb(181 189 200 / 94%) 0%,
      #769cbd 36%,
      #126b2e 100%
    );
    position: absolute;
    bottom: 0;
    left: 0;
    transform: rotate(45deg) translateY(50%);
    border-radius: 40px;

    &:nth-of-type(2) {
      left: 25%;
    }

    &:nth-of-type(3) {
      left: 50%;
    }

    &:nth-of-type(4) {
      left: 75%;
    }

    &:nth-of-type(5) {
      left: 100%;
    }
  }
}

.fps {
  position: absolute;
  top: 110px;
  right: 10px;
  font: 400 16px/1 sans-serif;
}

.rain-count {
  position: absolute;
  top: 135px;
  right: 10px;
  font: 400 16px/1 sans-serif;
}

.reset,
.debug {
  position: absolute;
  top: 10px;
  right: 10px;
  font: 400 16px/1 sans-serif;
  padding: 10px;
  border: 1px solid black;
  cursor: pointer;

  &:hover {
    background: black;
    color: white;
  }
}

.debug {
  top: 60px;
}

.raindrop {
  position: absolute;
  top: 0px;
  width: 2px;
  height: 5px;
  background: $water;
  transform: translateY(150px);
  z-index: 0;
}

.ground-grid {
  display: flex;
  flex-wrap: wrap;
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;

  &__block {
    width: $density;
    padding-top: $density;
    // border: 1px dashed black;
    box-sizing: border-box;
    position: relative;

    &--water {
      span {
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        background: $water;

        &:not([style="height:0%"])::before,
        &:not([style="height:0%"])::after {
          content: "";
          position: absolute;
          z-index: 0;
          background: $water;
          top: 0;
          right: 90%;
          height: 3vw;
          width: 1vw;
          border-radius: 15px;
        }
        &:not([style="height:0%"])::after {
          right: auto;
          left: 90%;
        }
      }

      &.heavyWater {
        &::after {
          content: "";
          position: absolute;
          top: 100%;
          left: 0;
          right: 0;
          height: 2vw;
          background: $water;
        }
      }
    }

    &--dirt,
    &--leftRound,
    &--rightRound {
      background: $ground;

      &::after {
        content: "";
        position: absolute;
        z-index: 1;
        width: 100%;
        height: 100%;
        background: $ground;
        top: 0;
        left: 0;
        border-radius: 15px 0 0 0;
      }
    }

    &--leftRound {
      border-radius: 15px 0 0 0;

      &.spillage {
        &::before {
          content: "";
          position: absolute;
          right: 0;
          bottom: 0;
          background: $water;
          top: -2px;
          left: -2px;
          border-radius: 15px 0 0 0;
        }
      }
    }

    &--rightRound {
      border-radius: 0 15px 0 0;

      &::after {
        border-radius: 0 15px 0 0;
      }

      &.spillage {
        &::before {
          content: "";
          position: absolute;
          left: 0;
          bottom: 0;
          background: $water;
          right: -2px;
          top: -2px;
          border-radius: 0 15px 0 0;
        }
      }
    }

    &--rightSlope {
      &::after {
        content: "";
        position: absolute;
        top: 0px;
        left: 0px;
        width: 0;
        height: 0;
        border-style: solid;
        border-width: 5vw 0 0 5vw;
        border-color: transparent transparent transparent $ground;
      }
    }

    &--leftSlope {
      &::after {
        content: "";
        position: absolute;
        top: 0px;
        left: 0px;
        width: 0;
        height: 0;
        border-style: solid;
        border-width: 0 0 5vw 5vw;
        border-color: transparent transparent $ground transparent;
      }
    }
  }
}

.cloud {
  position: absolute;
  top: 100px;
  left: 50%;
  transform: translateX(-50%);
  width: 110px;
  cursor: pointer;
  z-index: 1;

  &::after {
    content: "";
    position: absolute;
    background: white;
    width: 70px;
    height: 30px;
    top: 27px;
    left: 22px;
  }

  span {
    position: absolute;
    width: 40px;
    height: 40px;
    top: 0;
    left: 0;
    border-radius: 100%;
    background: white;
    box-shadow: 0px 0px 4px rgba(black, 0.1);

    &:nth-of-type(1) {
      top: 25px;
    }

    &:nth-of-type(2) {
      width: 30px;
      height: 30px;
      top: 13px;
      left: 20px;
    }

    &:nth-of-type(3) {
      left: 40px;
    }

    &:nth-of-type(4) {
      width: 30px;
      height: 30px;
      top: 12px;
      left: 67px;
    }

    &:nth-of-type(5) {
      width: 30px;
      height: 30px;
      top: 30px;
      left: 80px;
    }

    &:nth-of-type(6) {
      width: 23px;
      height: 23px;
      left: 24px;
      top: 45px;
    }

    &:nth-of-type(7) {
      width: 35px;
      height: 35px;
      left: 38px;
      top: 38px;
    }

    &:nth-of-type(8) {
      left: 60px;
      top: 40px;
      width: 30px;
      height: 30px;
    }
  }
}

              
            
!

JS

              
                let rows = [
  [
    0,
    0,
    0,
    5,
    6,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    5
  ],
  [
    6,
    0,
    5,
    4,
    4,
    6,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    5,
    4
  ],
  [
    4,
    4,
    4,
    4,
    4,
    4,
    4,
    6,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    5,
    4,
    4,
    4
  ],
  [
    4,
    4,
    4,
    4,
    4,
    4,
    4,
    4,
    6,
    0,
    5,
    6,
    0,
    0,
    5,
    4,
    6,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    4,
    4,
    4,
    4
  ],
  [
    4,
    4,
    4,
    4,
    4,
    4,
    4,
    4,
    4,
    4,
    4,
    4,
    4,
    4,
    4,
    4,
    4,
    6,
    0,
    5,
    4,
    6,
    0,
    0,
    0,
    5,
    4,
    4,
    4,
    4
  ]
];
const rowsBackup = JSON.parse(JSON.stringify(rows));
const cloudW = 110;
const density = 0.0333;
const maxDroplets = 80;
let raining = false;
const times = [];
const rainSpeed = 7;
const rainIncrease = 0.025;
const spreadIncrement = 0.01; // how fast the water spreads
const spreadCutoff = 0.01; // determines when the water should consider itself "equalized"
let reset = false;
let fps;

$(".reset").on("click", function (e) {
  reset = true;
});

$(".debug").on("click", function () {
  console.log(rows);
});

$(document).on("mousemove", function (e) {
  $(".cloud").css("left", e.pageX);
});

$(document).on("mousedown", function () {
  raining = true;
});

$(document).on("mouseup", function () {
  raining = false;
});

function mainLoop() {
  if (reset) {
    console.log("resetting flood...");
    rows = JSON.parse(JSON.stringify(rowsBackup));
    $(".raindrop").remove();
    reset = false;
  } else {
    if (raining && $(".raindrop").length < maxDroplets) {
      addDrop();
    }
    moveDrops();
    calcDrops();
    spreadWater();
  }
  calcFPS();
  drawRows();
  requestAnimationFrame(mainLoop);
}
requestAnimationFrame(mainLoop);

function moveDrops() {
  const screenH = $(window).outerHeight();
  const screenW = $(window).outerWidth();
  $(".raindrop").each(function () {
    const currY = $(this).offset().top;
    const newY = currY + rainSpeed;
    const dropCol = parseInt($(this).data("col"));
    const colHeight = getColHeight(dropCol);
    if (newY > screenH - colHeight * (screenW * density)) {
      let emptyRow = -1;
      $.each(rows.slice().reverse(), function (index, row) {
        if (row[dropCol] < 1) {
          emptyRow = rows.length - 1 - index;
          return false;
        }
      });
      if (emptyRow > -1) {
        rows[emptyRow][dropCol] = Math.min(
          1,
          rows[emptyRow][dropCol] + rainIncrease
        );
      }
      $(this).remove();
    } else {
      $(this).css("transform", "translateY(" + newY + "px)");
    }
  });
}

function addDrop() {
  const xRand = Math.random() * cloudW;
  const cloudLeft = $(".cloud").offset().left;
  const rainPos = cloudLeft + xRand;
  const winW = $(window).outerWidth();
  const colSector = Math.floor((rainPos / winW / 3.33) * 100);
  // console.log("adding raindrop to column " + colSector);
  $("body").append('<div class="raindrop raindrop--new"></div>');
  $(".raindrop--new")
    .removeClass("raindrop--new")
    .css("left", rainPos)
    .data("col", colSector);
}

function calcFPS() {
  const now = performance.now();
  while (times.length > 0 && times[0] <= now - 1000) {
    times.shift();
  }
  times.push(now);
  fps = times.length;
  $(".fps").text("FPS: " + fps);
}

function calcDrops() {
  $(".rain-count").text("Droplets: " + $(".raindrop").length);
}

function drawRows() {
  const grid = $(".ground-grid");
  grid.empty();
  $.each(rows, function (index, row) {
    $.each(row, function (index2, col) {
      let removeSpillage = false;
      let newBlock = $(
        '<div class="ground-grid__block" data-row=' +
          index +
          " data-col=" +
          index2 +
          "></div>"
      );
      if (col > 6) {
        newBlock.addClass("spillage");
        removeSpillage = true;
      }
      if (col == 6 || col == 8) {
        newBlock.addClass("ground-grid__block--rightRound");
      }
      if (col == 5 || col == 7) {
        newBlock.addClass("ground-grid__block--leftRound");
      }
      if (col == 4) {
        newBlock.addClass("ground-grid__block--dirt");
      }
      if (col == 2) {
        newBlock.addClass("ground-grid__block--rightSlope");
      }
      if (col == 3) {
        newBlock.addClass("ground-grid__block--leftSlope");
      }
      if (col <= 1 && col > 0) {
        const level = col * 100;
        const heavyWater = level >= 5;
        const drawLevel = heavyWater ? level : 0;
        newBlock
          .addClass("ground-grid__block--water")
          .append(
            "<span data-level=" +
              level +
              ' style="height:' +
              (drawLevel + "%") +
              '"></span>'
          );
        if (heavyWater) {
          newBlock.addClass("heavyWater");
        }
      }
      grid.append(newBlock);
      rows[index][index2] = removeSpillage
        ? rows[index][index2] - 2
        : rows[index][index2];
    });
  });
}

function spreadWater() {
  // remove spillage animations
  $(".spillage").removeClass("spillage");
  // go through each water tile and spread water
  $(".ground-grid__block--water").each(function () {
    const row = $(this).data("row");
    const col = $(this).data("col");
    const level = $(this).find("span").data("level") / 100;
    let addBelow = false;
    // always check block below first
    const belowBlockVal = row != rows.length - 1 ? rows[row + 1][col] : null;
    if (belowBlockVal !== null && belowBlockVal < 1) {
      rows[row + 1][col] += spreadIncrement;
      if (rows[row + 1][col] > 1) {
        rows[row + 1][col] = 1;
      }
      rows[row][col] -= spreadIncrement;
      addBelow = true;
    }
    // check block to the left
    const leftBlockVal = col != 0 ? rows[row][col - 1] : null;
    if (
      leftBlockVal !== null &&
      leftBlockVal < 1 &&
      leftBlockVal < level &&
      Math.abs(leftBlockVal - level) > spreadCutoff &&
      !addBelow
    ) {
      rows[row][col] -= spreadIncrement;
      rows[row][col - 1] += spreadIncrement;
      if (rows[row][col - 1] > 1) {
        rows[row][col - 1] = 1;
      }
      // if not falling down, add spillage below
      if (belowBlockVal !== null && belowBlockVal != 4 && belowBlockVal != 1) {
        rows[row + 1][col] = belowBlockVal == 5 ? 7 : 8;
      }
    }
    // check block to the right
    const rightBlockVal = col != 29 ? rows[row][col + 1] : null;
    if (
      rightBlockVal !== null &&
      rightBlockVal < 1 &&
      rightBlockVal < level &&
      Math.abs(rightBlockVal - level) > spreadCutoff &&
      !addBelow
    ) {
      rows[row][col] -= spreadIncrement;
      rows[row][col + 1] += spreadIncrement;
      if (rows[row][col + 1] > 1) {
        rows[row][col + 1] = 1;
      }
      // if not falling down, add spillage below
      if (belowBlockVal !== null && belowBlockVal != 4 && belowBlockVal != 1) {
        rows[row + 1][col] = belowBlockVal == 5 ? 7 : 8;
      }
    }
    // if tile is essentially empty, drain it
    if (level < spreadIncrement) {
      rows[row][col] = 0;
    }
  });
}

function getColHeight(col) {
  let height = 0;
  $.each(rows.slice().reverse(), function (index, row) {
    const rowCol = row[col];
    if (rowCol == 0) {
      return false;
    } else if (rowCol <= 1) {
      height += rowCol;
    } else {
      height += 1;
    }
  });
  return height;
}

              
            
!
999px

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