bar3D-image-pixels.html
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Bar3D Simplex Noise - ECHARTS-GL</title>
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
<meta name="apple-mobile-web-app-capable" content="yes"> <!-- Fullscreen Landscape on iOS -->
<link rel="stylesheet" href="./common.css">
</head>
<body>
<div id="main"></div>
<script src="../node_modules/echarts/dist/echarts.js"></script>
<script src="../dist/echarts-gl.js"></script>
<script src="lib/jquery.min.js"></script>
<script src="lib/dat.gui.js"></script>
<script src="js/commonUI.js"></script>
<script>
var chart = echarts.init(document.getElementById('main'), null, {
devicePixelRatio: 1
});
var img = new Image();
var canvas = document.createElement('canvas');
var ctx = canvas.getContext('2d');
var config = {
scale: 0.25
};
chart.setOption({
tooltip: {},
backgroundColor: '#000',
xAxis3D: {
type: 'value'
},
yAxis3D: {
type: 'value'
},
zAxis3D: {
type: 'value',
min: 0,
max: 100
},
grid3D: {
show: false,
viewControl: {
alpha: 70,
beta: 0
},
postEffect: {
enable: true,
bloom: {
// intensity: 0.2
},
screenSpaceAmbientOcclusion: {
enable: true,
intensity: 0
}
// depthOfField: {
// enable: true,
// blurRadius: 4,
// fstop: 10
// }
},
boxDepth: 100,
boxHeight: 20,
environment: 'none',
light: {
main: {
shadow: true,
intensity: 2
},
ambientCubemap: {
texture: 'asset/canyon.hdr',
exposure: 2,
diffuseIntensity: 0.2
}
}
}
})
function updateData(pixelData, width, height) {
console.time('update');
var data = new Float32Array(pixelData.length / 4 * 3);
var off = 0;
for (var i = 0; i < pixelData.length / 4; i++) {
var r = pixelData[i * 4];
var g = pixelData[i * 4 + 1];
var b = pixelData[i * 4 + 2];
var lum = (0.2125 * r + 0.7154 * g + 0.0721 * b);
lum = (lum - 125) * config.scale + 50;
data[off++] = i % width;
data[off++] = height - Math.floor(i / width);
data[off++] = lum;
}
chart.setOption({
series: [{
type: 'bar3D',
shading: 'realistic',
dimensions: ['x', 'y', 'z'],
encode: {
x: 'x',
y: 'y',
z: 'z'
},
realisticMaterial: {
roughness: 0.4
},
barSize: 0.8,
silent: true,
itemStyle: {
color: function (params) {
var i = params.dataIndex;
var r = pixelData[i * 4] / 255;
var g = pixelData[i * 4 + 1] / 255;
var b = pixelData[i * 4 + 2] / 255;
var lum = (0.2125 * r + 0.7154 * g + 0.0721 * b);
r *= lum * 2;
g *= lum * 2;
b *= lum * 2;
return [r, g, b, 1];
}
},
data: data
}]
});
console.timeEnd('update');
}
img.onload = function () {
var width = canvas.width = img.width / 2;
var height = canvas.height = img.height / 2;
ctx.drawImage(img, 0, 0, width, height);
var imgData = ctx.getImageData(0, 0, width, height);
updateData(imgData.data, width, height);
var gui = new dat.GUI();
gui.add(config, 'scale', 0, 1).onFinishChange(function () {
updateData(imgData.data, width, height);
})
}
img.src = 'asset/sample.jpg';
window.onresize = chart.resize;
</script>
</body>
</html>