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CSS Base

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HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              body {
  margin: 0;
  padding: 0;
}

canvas {
  display: block;
  float: left;
}
            
          
!
            
              var previewCanvas = document.createElement('canvas');
var width = previewCanvas.width = 100;
var height = previewCanvas.height = 100;
var pctx = previewCanvas.getContext('2d');

var PI = Math.PI;
var TAU = PI*2;


renderTallGrass();
renderTallGrass();
renderBushes();
renderForest();
renderBushes();
renderMountainRange();
renderForest();
renderMountainRange();
renderRiver();


var imgData = pctx.getImageData( 0, 0, width, height ).data;
var scale = Math.floor( Math.max( window.innerWidth, window.innerHeight ) / 20 );

document.body.style.width = width * scale + 'px';

var colorRenderers = {
  // empty
  // '#000000': function( ctx ) {
  //   ctx.fillStyle = '#FD9';
  //   circle( ctx, 0.5, 0.5, 0.25 );
  // },
  '#000000': function( ctx ) {
    ctx.fillStyle = '#FD9';
    // circle( ctx, 0.5, 0.5, 0.475 );
    emptyDot( ctx, 0.25, 0.25 );
    emptyDot( ctx, 0.25, 0.75 );
    emptyDot( ctx, 0.75, 0.25 );
    emptyDot( ctx, 0.75, 0.75 );
  },
  // water
  '#1199FF': function( ctx ) {
    ctx.fillStyle = '#19F';
    circle( ctx, 0.5, 0.5, 0.475 );
  },
  // mountain
  '#CC5500': function( ctx ) {
    ctx.fillStyle = '#C50';
    ctx.beginPath();
    ctx.moveTo( 0, 1 );
    ctx.lineTo( 0.5, 0 );
    ctx.lineTo( 1, 1 );
    ctx.lineTo( 0, 1 );
    ctx.fill();
    ctx.closePath();
  },
  // forest
  '#88CC88': function( ctx ) {
    ctx.fillStyle = '#2C5';
    ctx.beginPath();
    ctx.moveTo( 0, 1 );
    ctx.lineTo( 0.5, 0.5 );
    ctx.lineTo( 1, 1 );
    ctx.lineTo( 0, 1 );
    ctx.moveTo( 0, 0.5 );
    ctx.lineTo( 0.5, 0 );
    ctx.lineTo( 1, 0.5 );
    ctx.lineTo( 0, 0.5 );
    ctx.fill();
    ctx.closePath();
  },

  // tall grass
  '#CCEEBB': function( ctx ) {
    ctx.fillStyle = '#CDB';
    ctx.beginPath();
    ctx.moveTo( 0, 0.75 );
    ctx.lineTo( 0.25, 0 );
    ctx.lineTo( 0.25, 0.75 );
    ctx.lineTo( 0, 0.75 );
    ctx.moveTo( 0.5, 1 );
    ctx.lineTo( 0.5, 0.25 );
    ctx.lineTo( 0.75, 1 );
    ctx.lineTo( 0.5, 1 );
    ctx.fill();
    ctx.closePath();
  },
  // bushes/boulders
  '#CC2255': function( ctx ) {
    ctx.fillStyle = '#C90';
    ctx.save();
    ctx.beginPath();
    ctx.arc( 0.5, 0.5, 0.45, TAU * 3/8, TAU*9/8 );
    ctx.fill();
    ctx.closePath();
    ctx.restore();
  }

};

function circle( ctx, x, y, radius ) {
  ctx.beginPath();
  ctx.arc( x, y, radius, 0, TAU );
  ctx.fill();
  ctx.closePath();
}

function emptyDot( ctx, x, y ) {
  if ( Math.random() > 0.0 ) {
    circle( ctx, x, y, 0.125 );
  }
}


for ( var tileY = 0; tileY < height; tileY += 10 ) {
  for ( var tileX = 0; tileX < width; tileX += 10 ) {
    renderOverworldTile( tileX, tileY );
  }
}

function renderOverworldTile( tileX, tileY ) {
  var canvas = document.createElement('canvas');
  var ctx = canvas.getContext('2d');
  var tw = canvas.width = scale * 10;
  var th = canvas.height = scale * 10;

  ctx.fillStyle = '#FED';
  ctx.fillRect( 0, 0, tw, th );
  ctx.scale( scale, scale );

  // console.log('render tile', tileX, tileY);

  for ( var y=0; y<10; y++ ) {
    for ( var x=0; x<10; x++ ) {
      var x2 = tileX + x;
      var y2 = tileY + y;
      // console.log( x2, y2 );
      var i = ( y2*width + x2 ) * 4;
      var color = [ imgData[i], imgData[i+1], imgData[i+2] ];
      var hex = rgb2hex( color );
      var renderer = colorRenderers[ hex ];
      if ( renderer ) {
        ctx.save();
        ctx.translate( x, y );
        renderer( ctx );
        ctx.restore();
      }
    }
  }

  document.body.appendChild( canvas );
}


document.body.insertBefore( previewCanvas, container );

function renderForest() {
  curlyWalk({
    color: '#8C8',
    length: 200,
    angleVelocitySize: 1.5,
    walkSize: 2,
    minBrushSize: 2,
    maxBrushSize: 10,
    startBrushSize: 4,
    brushStepSize: 2,
  });
}

function renderTallGrass() {
  curlyWalk({
    color: '#CEB',
    maxBrushSize: 7,
    startBrushSize: 3,
    brushStepSize: 2,
    // angleVelocitySize: 1.5,
    // walkSize: 2,
    // minBrushSize: 1,
    // maxBrushSize: 3,
  });
}

function renderBushes() {
  curlyWalk({
    color: '#C25',
    walkSize: 2,
    minBrushSize: 1,
    maxBrushSize: 3,
    startBrushSize: 1,
    brushStepSize: 1,
  });
}

function renderMountainRange() {

  curlyWalk({
    color: '#C50',
    angleVelocitySize: 2,
    walkSize: 3,
    minBrushSize: 4,
    maxBrushSize: 12,
    startBrushSize: 4,
    brushStepSize: 2,
  });


}

function renderRiver() {

  var startTheta = Math.random() * TAU;

  var walkerX = Math.cos( startTheta ) * 80;
  var walkerY = Math.sin( startTheta ) * 80;

  var flowAngle = startTheta + TAU/2;
  var angle = flowAngle;
  var rSize = 3;

  pctx.fillStyle = '#19F';

  for ( var i=0; i < 400; i++ ) {
    // angleVelocity = (Math.random() - 0.5) * (Math.random() - 0.5) * 3;
    if ( Math.random() > 0.7 ) {
      angle = flowAngle + ( Math.random()*2 - 1 ) * TAU/4;
    }
    walkerX += Math.cos( angle );
    walkerY += Math.sin( angle );

    var rRand = Math.random();
    if ( rRand > 0.82 ) {
      rSize += 1;
    } else if ( rRand > 0.62 ) {
      rSize -= 1;
    }
    rSize = Math.max( 2, Math.min( rSize, 8 ) );
    var size = rSize;

    var x = Math.round( width/2 + walkerX - size/2 );
    var y = Math.round( height/2 + walkerY - size/2 );

    pctx.fillRect( x, y, size, size );
  }


}


function curlyWalk( props ) {

  props = extend({
    startSize: 30,
    length: 300,
    color: '#888',
    angleVelocitySize: 1.5,
    walkSize: 1,
    minBrushSize: 1,
    maxBrushSize: 5,
    brushStepSize: 1,
    startBrushSize: 1,
  }, props );

  var wx = ( Math.random()*2 - 1 ) * props.startSize;
  var wy = ( Math.random()*2 - 1 ) * props.startSize;

  var angleVelocity = 0;
  var angle = 0;

  pctx.fillStyle = props.color;

  for ( var i=0; i < props.length; i++ ) {

    angleVelocity = ( Math.random()*2 - 1 ) * props.angleVelocitySize;
    angle += angleVelocity;

    wx += Math.cos( angle ) * props.walkSize;
    wy += Math.sin( angle ) * props.walkSize;

    var rSize = props.startBrushSize;
    var rRand = Math.random();
    if ( rRand > 0.82 ) {
      rSize += props.brushStepSize;
    } else if ( rRand > 0.62 ) {
      rSize -= props.brushStepSize;
    }
    rSize = Math.max( props.minBrushSize, Math.min( rSize, props.maxBrushSize ) );

    var x = Math.round( width/2 + wx - rSize/2 );
    var y = Math.round( height/2 + wy - rSize/2 );

    pctx.fillRect( x, y, rSize, rSize );

  }

}


function extend( a, b ) {
  for ( var prop in b ) {
    a[ prop ] = b[ prop ];
  }
  return a;
}


function rgb2hex( rgb ) {
  var hex = rgb.map( function( value ) {
    var hexNum = value.toString(16).toUpperCase();
    // left pad 0
    hexNum = hexNum.length < 2 ? '0' + hexNum : hexNum;
    return hexNum;
  });

  return '#' + hex.join('');
}
            
          
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