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Adding Mask Feature #187

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Adding Mask Feature #187

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1742387
Word cloud with masks
a10k Sep 23, 2023
7d4d60f
Update mask in Readme
a10k Sep 27, 2023
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20 changes: 20 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -168,3 +168,23 @@ function() { return document.createElement("canvas"); }

When using Node.js, you will almost definitely override this default, e.g.
using the [canvas module](https://www.npmjs.com/package/canvas).

<a name="mask" href="#mask">#</a> <b>mask</b>([<i>mask</i>])

If specified, sets the **mask** image used internally
to draw text fitting within the transaparent areas of the provided image. If not specified, returns the current mask image, defaults to null.

```js
// Mask Example
var img = document.querySelector("img#mask")
img.onload = ()=>{
d3.layout.cloud()
.size([500, 500])
.mask(img)
}
```

Ensure the image is loaded before using it, typically using the onload event on the image.

Note: The image must be hosted with the appropriate CORS headers if being hosted on a different origin.

49 changes: 47 additions & 2 deletions build/d3.layout.cloud.js
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Expand Up @@ -13,6 +13,7 @@ const SPIRALS = {

const cw = 1 << 11 >> 5;
const ch = 1 << 11;
const random = Math.random;

module.exports = function() {
var size = [256, 256],
Expand All @@ -30,15 +31,17 @@ module.exports = function() {
timer = null,
random = Math.random,
cloud = {},
canvas = cloudCanvas;
canvas = cloudCanvas,
mask = false
maskBoard = null;

cloud.canvas = function(_) {
return arguments.length ? (canvas = functor(_), cloud) : canvas;
};

cloud.start = function() {
var contextAndRatio = getContext(canvas()),
board = zeroArray((size[0] >> 5) * size[1]),
board = mask ? maskBoard : zeroArray((size[0] >> 5) * size[1]),
bounds = null,
n = words.length,
i = -1,
Expand Down Expand Up @@ -161,6 +164,16 @@ module.exports = function() {
return arguments.length ? (timeInterval = _ == null ? Infinity : _, cloud) : timeInterval;
};

cloud.mask = function(_){
if(arguments.length){
mask = _
maskBoard = createMaskBoard(_,size[0],size[1])
return cloud
}else{
return mask
}
};

cloud.words = function(_) {
return arguments.length ? (words = _, cloud) : words;
};
Expand Down Expand Up @@ -404,6 +417,38 @@ function functor(d) {
return typeof d === "function" ? d : function() { return d; };
}

function get_mask_pixels(mask,w,h){
var canvas = document.createElement('canvas')
canvas.width = w
canvas.height = h;
var ctx = canvas.getContext("2d");
ctx.drawImage(mask, 0, 0, w, h)
return ctx.getImageData(0, 0, w, h).data
}

function create_mask_board_from_pixels(mask_pixels, w,h){
var w32 = w >> 5 //divedes by 32
var sprite = []
// Zero the buffer
for (var i = 0; i < h * w32; i++){
sprite[i] = 0
}
for (var j = 0; j < h; j++) {
for (var i = 0; i < w; i++) {
var k = w32 * j + (i >> 5);
var m = mask_pixels[(j * w + (i)) << 2] ? 1 << (31 - (i % 32)) : 0;
sprite[k] |= m;
}
}
return sprite.slice(0, w * w32)
}

function createMaskBoard(mask,w,h){
var pixels = get_mask_pixels(mask,w,h)
var board = create_mask_board_from_pixels(pixels,w,h)
return board
}

},{"d3-dispatch":2}],2:[function(require,module,exports){
// https://d3js.org/d3-dispatch/ v1.0.6 Copyright 2019 Mike Bostock
(function (global, factory) {
Expand Down
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67 changes: 67 additions & 0 deletions examples/mask_example.html
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@@ -0,0 +1,67 @@
<html>

<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/7.8.5/d3.min.js"></script>
<script src="../build/d3.layout.cloud.js"></script>
</head>

<body>
<img src="./mask.png" id="mask" />
<script>
document.querySelector("#mask").onload = () => {
var count = 500
var scale = d3.scaleSqrt().range([20, 8]).domain([0, count])
var words = d3.range(0, count).map((d) => {
return {
text: "Hello",
size: scale(d),
};
});

var layout = d3.layout
.cloud()
.size([500, 500])
.mask(document.querySelector("#mask"))
.words(words)
.padding(1)
.font("Impact")
.fontSize(function (d) {
return d.size;
})
.on("end", function draw(words) {
d3.select("body")
.append('svg').
attr("viewBox", "0 0 500 500")
.attr("width", 500)
.append("g")
.attr(
"transform",
"translate(" +
layout.size()[0] / 2 +
"," +
layout.size()[1] / 2 +
")"
)
.selectAll("text")
.data(words)
.enter()
.append("text")
.style("font-size", function (d) {
return d.size + "px";
})
.style("font-family", "Impact")
.attr("text-anchor", "middle")
.attr("transform", function (d) {
return "translate(" + [d.x, d.y] + ")rotate(" + d.rotate + ")";
})
.text(function (d) {
return d.text;
});
});
layout.start()
}

</script>
</body>

</html>
49 changes: 47 additions & 2 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@ const SPIRALS = {

const cw = 1 << 11 >> 5;
const ch = 1 << 11;
const random = Math.random;

module.exports = function() {
var size = [256, 256],
Expand All @@ -29,15 +30,17 @@ module.exports = function() {
timer = null,
random = Math.random,
cloud = {},
canvas = cloudCanvas;
canvas = cloudCanvas,
mask = false
maskBoard = null;

cloud.canvas = function(_) {
return arguments.length ? (canvas = functor(_), cloud) : canvas;
};

cloud.start = function() {
var contextAndRatio = getContext(canvas()),
board = zeroArray((size[0] >> 5) * size[1]),
board = mask ? maskBoard : zeroArray((size[0] >> 5) * size[1]),
bounds = null,
n = words.length,
i = -1,
Expand Down Expand Up @@ -160,6 +163,16 @@ module.exports = function() {
return arguments.length ? (timeInterval = _ == null ? Infinity : _, cloud) : timeInterval;
};

cloud.mask = function(_){
if(arguments.length){
mask = _
maskBoard = createMaskBoard(_,size[0],size[1])
return cloud
}else{
return mask
}
};

cloud.words = function(_) {
return arguments.length ? (words = _, cloud) : words;
};
Expand Down Expand Up @@ -402,3 +415,35 @@ function cloudCanvas() {
function functor(d) {
return typeof d === "function" ? d : function() { return d; };
}

function get_mask_pixels(mask,w,h){
var canvas = document.createElement('canvas')
canvas.width = w
canvas.height = h;
var ctx = canvas.getContext("2d");
ctx.drawImage(mask, 0, 0, w, h)
return ctx.getImageData(0, 0, w, h).data
}

function create_mask_board_from_pixels(mask_pixels, w,h){
var w32 = w >> 5 //divedes by 32
var sprite = []
// Zero the buffer
for (var i = 0; i < h * w32; i++){
sprite[i] = 0
}
for (var j = 0; j < h; j++) {
for (var i = 0; i < w; i++) {
var k = w32 * j + (i >> 5);
var m = mask_pixels[(j * w + (i)) << 2] ? 1 << (31 - (i % 32)) : 0;
sprite[k] |= m;
}
}
return sprite.slice(0, w * w32)
}

function createMaskBoard(mask,w,h){
var pixels = get_mask_pixels(mask,w,h)
var board = create_mask_board_from_pixels(pixels,w,h)
return board
}