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javascript - 使用 D3.js 的 3D 条形图的透视问题

转载 作者:行者123 更新时间:2023-11-29 23:16:23 24 4
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我目前正在使用 D3.js 构建 3D 条形图并基于可用代码 here

我遇到的问题是,当将所有条形图彼此靠近并旋转我的条形图时,透视/投影/ View 会做一些奇怪的事情,并使某些值在某些 Angular 完全平坦。现在我知道这可能只是一个 Angular 问题,但我非常想纠正它。

这是我使用的代码

<!DOCTYPE html>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://unpkg.com/d3-3d/build/d3-3d.min.js"></script>
<body>
<svg width="960" height="500"></svg>
<style type="text/css">
button {
position: absolute;
right: 10px;
top: 10px;
}
</style>
<button>update</button>
<script>
var origin = [480, 300], scale = 20, j = 10, cubesData = [], alpha = 0, beta = 0, startAngle = Math.PI/6;
var svg = d3.select('svg').call(d3.drag().on('drag', dragged).on('start', dragStart).on('end', dragEnd)).append('g');
var color = d3.scaleOrdinal(d3.schemeCategory20);
var cubesGroup = svg.append('g').attr('class', 'cubes');
var mx, my, mouseX, mouseY;

var cubes3D = d3._3d()
.shape('CUBE')
.x(function(d){ return d.x; })
.y(function(d){ return d.y; })
.z(function(d){ return d.z; })
.rotateY( startAngle)
.rotateX(-startAngle)
.origin(origin)
.scale(scale);

function processData(data, tt){

/* --------- CUBES ---------*/

var cubes = cubesGroup.selectAll('g.cube').data(data, function(d){ return d.id });

var ce = cubes
.enter()
.append('g')
.attr('class', 'cube')
.attr('fill', function(d){ return color(d.id); })
.attr('stroke', function(d){ return d3.color(color(d.id)).darker(2); })
.merge(cubes)
.sort(cubes3D.sort);

cubes.exit().remove();

/* --------- FACES ---------*/

var faces = cubes.merge(ce).selectAll('path.face').data(function(d){ return d.faces; }, function(d){ return d.face; });

faces.enter()
.append('path')
.attr('class', 'face')
.attr('fill-opacity', 0.95)
.classed('_3d', true)
.merge(faces)
.transition().duration(tt)
.attr('d', cubes3D.draw);

faces.exit().remove();

/* --------- TEXT ---------*/

var texts = cubes.merge(ce).selectAll('text.text').data(function(d){
var _t = d.faces.filter(function(d){
return d.face === 'top';
});
return [{height: d.height, centroid: _t[0].centroid}];
});

texts
.enter()
.append('text')
.attr('class', 'text')
.attr('dy', '-.7em')
.attr('text-anchor', 'middle')
.attr('font-family', 'sans-serif')
.attr('font-weight', 'bolder')
.attr('x', function(d){ return origin[0] + scale * d.centroid.x })
.attr('y', function(d){ return origin[1] + scale * d.centroid.y })
.classed('_3d', true)
.merge(texts)
.transition().duration(tt)
.attr('fill', 'black')
.attr('stroke', 'none')
.attr('x', function(d){ return origin[0] + scale * d.centroid.x })
.attr('y', function(d){ return origin[1] + scale * d.centroid.y })
.tween('text', function(d){
var that = d3.select(this);
var i = d3.interpolateNumber(+that.text(), Math.abs(d.height));
return function(t){
that.text(i(t).toFixed(1));
};
});

texts.exit().remove();

/* --------- SORT TEXT & FACES ---------*/

ce.selectAll('._3d').sort(d3._3d().sort);

}

function init(){
cubesData = [];
var cnt = 0;
for(var z = -j/2; z <= j/2; z = z + 2){
for(var x = -j; x <= j; x = x + 2){
var h = d3.randomUniform(-2, -7)();
var _cube = makeCube(h, x, z);
_cube.id = 'cube_' + cnt++;
_cube.height = h;
cubesData.push(_cube);
}
}
processData(cubes3D(cubesData), 1000);
}

function dragStart(){
mx = d3.event.x;
my = d3.event.y;
}

function dragged(){
mouseX = mouseX || 0;
mouseY = mouseY || 0;
beta = (d3.event.x - mx + mouseX) * Math.PI / 230 ;
alpha = (d3.event.y - my + mouseY) * Math.PI / 230 * (-1);
processData(cubes3D.rotateY(beta + startAngle).rotateX(alpha - startAngle)(cubesData), 0);
}

function dragEnd(){
mouseX = d3.event.x - mx + mouseX;
mouseY = d3.event.y - my + mouseY;
}

function makeCube(h, x, z){
return [
{x: x - 1, y: h, z: z + 1}, // FRONT TOP LEFT
{x: x - 1, y: 0, z: z + 1}, // FRONT BOTTOM LEFT
{x: x + 1, y: 0, z: z + 1}, // FRONT BOTTOM RIGHT
{x: x + 1, y: h, z: z + 1}, // FRONT TOP RIGHT
{x: x - 1, y: h, z: z - 1}, // BACK TOP LEFT
{x: x - 1, y: 0, z: z - 1}, // BACK BOTTOM LEFT
{x: x + 1, y: 0, z: z - 1}, // BACK BOTTOM RIGHT
{x: x + 1, y: h, z: z - 1}, // BACK TOP RIGHT
];
}

d3.selectAll('button').on('click', init);

init();
</script>
</body>

这里用两张图片来说明问题。

第一张图片确实清楚地显示了我的酒吧及其值(value)。 Highlighted bar is displayed

稍微旋转以获得第二张图片,但它会“消失”(然而我的印象是它并没有消失,只是达到了一个非常小的高度值)Highlighted bar is not visible

有人知道这是从哪里来的吗?

最佳答案

感谢@rioV8 的评论,我解决了这个问题,他建议 SVG 在这里不够用。

因此我使用了 Three.js。这是我的函数 makeCube

function makeCube(h, x, length_x, z, length_z){


h = normalise_height(h)
h = -h //for drawing purposes

x = x
z = z


var geometry = new THREE.CubeGeometry(length_x, h, length_z);
var material = new THREE.MeshBasicMaterial( { color: 0x00ff00ff, wireframe: false } );
var mesh = new THREE.Mesh(geometry, material);


var eGeometry = new THREE.Geometry();
var positions = [];
positions.push([0, 0, 0]);
positions.push([length_x, 0, 0]);
positions.push([length_x, 0, length_z]);
positions.push([0, 0, length_z]);
positions.push([0, 0, 0]);
positions.push([0, h, 0]);
positions.push([length_x, h, 0]);
positions.push([length_x, h, length_z]);
positions.push([0, h, length_z]);
positions.push([0, h, 0]);
positions.push([0, h, length_z]);
positions.push([0, 0, length_z]);
positions.push([0, h, length_z]);
positions.push([length_x, h, length_z]);
positions.push([length_x, 0, length_z]);
positions.push([length_x, h, length_z]);

positions.push([length_x, h, 0]);
positions.push([length_x, 0, 0]);

for(i = 0; i < positions.length; i++)
{
//console.log(positions[i])
eGeometry.vertices.push(new THREE.Vector3(positions[i][0]-length_x/2.0,
positions[i][1]-h/2.0,
positions[i][2]-length_z/2.0));
}

length_x -= epsilon;
length_z -= epsilon;

var eMaterial = new THREE.LineBasicMaterial( { color: 0x0000000, linewidth: 1 } );
var edges = new THREE.Line( eGeometry , eMaterial );
mesh.add( edges );

mesh.position.set(x+length_x/2.0, h/2.0, z+length_z/2.0);
parentObject.add(mesh);

return mesh;
}

关于javascript - 使用 D3.js 的 3D 条形图的透视问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52649382/

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