问题
I am modifying this code: https://github.com/jasondavies/d3-cloud
<script>
d3.layout.cloud().size([300, 300])
.words([
"Hello", "world", "normally", "you", "want", "more", "words",
"than", "this"].map(function(d) {
return {text: d, size: 10 + Math.random() * 90};
}))
.rotate(function() { return ~~(Math.random() * 2) * 90; })
.fontSize(function(d) { return d.size; })
.on("end", draw)
.start();
function draw(words) {
d3.select("body").append("svg")
.attr("width", 300)
.attr("height", 300)
.append("g")
.attr("transform", "translate(150,150)")
.selectAll("text")
.data(words)
.enter().append("text")
.style("font-size", function(d) { return d.size + "px"; })
.attr("text-anchor", "middle")
.attr("transform", function(d) {
return "translate(" + [d.x, d.y] + ")rotate(" + d.rotate + ")";
})
.text(function(d) { return d.text; });
}
</script>
I'd like to get the word and size data from separate JSON data. I have two variables
jWord = ["abc","def","ghi,"jkl"];
jCount = ["2", "5", "3", "8"];
jWord has the words that I want to display in the tag clouds. jCount is the size of the corresponding word (same order).
I switched to the word to jWord, but not sure how to switch the size part in
.words(jWord.map(function(d) {
return {text: d, size: 10 + Math.random() * 90};
}))
I also have another Json format variable.
jWord_Count = ["abc":2, "def":5, "ghi":3, "jkl":8 ];
If this format helps.
回答1:
Try d3.zip: d3.zip(jWord, jCount)
returns a merged array where the first element is the text and size of the first word [jWord[0], jCount[0]]
, the second element is the second word, and so on. For example:
.words(d3.zip(jWord, jCount).map(function(d) {
return {text: d[0], size: d[1]};
}))
In effect, d3.zip turns column-oriented data into row-oriented data. You could also just represent your data in row-oriented form to begin with:
var words = [
{text: "abc", size: 2},
{text: "def", size: 5},
{text: "ghi", size: 3},
{text: "jkl", size: 8}
];
Lastly, watch out with types. Your counts are represented as strings ("2"
) rather than numbers (2
). So you might want to use +
to coerce them to numbers.
来源:https://stackoverflow.com/questions/10692276/d3-js-tag-cloud-size-from-a-json-array