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javascript - 仅在蒙版图像上显示图标

转载 作者:太空狗 更新时间:2023-10-29 15:09:48 25 4
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我们的 json 文件中有两种类型的图像....

1.蒙版图片

  • 具有如下透明背景:

enter image description here

2.背景图片:

  • 任何普通图片

现在我在所有图像上显示图标,如下面的代码笔....

mask 图像 上的图标:https://codepen.io/kidsdial/pen/aMPvam

enter image description here

背景图片上的图标:https://codepen.io/kidsdial/pen/jJXbej

enter image description here

蒙版图像的 Json 示例:

"layers" : [
{
"src" : "image1.png",
"name" : "mask_image_1"
},

背景图像的 Json 示例:

"layers" : [
{
"src" : "image2.png",
"name" : "bg_image"
},

要求:

但我只想在蒙版图像上显示图标,而不是在背景图像上显示图标....

所以我使用了下面的代码,但这对我没有帮助:

if (layer.name == mask_image_1) 
{
imageUrl: imageUrl,
}

面具图像的名称将在 JSON 中以“ma​​sk_”开头

var target;
var imageUrl = "https://i.imgur.com/As37YCl.png";

let jsonData = {
"layers" : [
{
"x" : 0,
"height" : 788,
"layers" : [
{
"x" : 0,
"height" : 788,
"src" : "lRtZPoj.jpg",
"y" : 0,
"width" : 940,
"type" : "image",
"name" : "bg_image"
}
],
"y" : 0,
"width" : 940,
"type" : "group",
"name" : "fb_post_5"
}
]
};

$(document).ready(function() {

// upload image onclick

$('.container').click(function(e) {
// filtering out non-canvas clicks
if (e.target.tagName !== 'CANVAS') return;

// getting absolute points relative to container
const absX = e.offsetX + e.target.parentNode.offsetLeft + e.currentTarget.offsetLeft;
const absY = e.offsetY + e.target.parentNode.offsetTop + e.currentTarget.offsetTop;

const $canvasList = $(this).find('canvas');
// moving all canvas parents on the same z-index
$canvasList.parent().css({zIndex: 0});

$canvasList.filter(function () { // filtering only applicable canvases
const bbox = this.getBoundingClientRect()
return (
absX >= bbox.left && absX <= bbox.left + bbox.width &&
absY >= bbox.top && absY <= bbox.top + bbox.height)
}).each(function () { // checking white in a click position
const x = absX - this.parentNode.offsetLeft - e.currentTarget.offsetLeft;
const y = absY - this.parentNode.offsetTop - e.currentTarget.offsetTop;
const pixel = this.getContext('2d').getImageData(x, y, 1, 1).data;
if (pixel[3] === 255) {
$(this).parent().css({zIndex: 2})
target = this.id;
console.log(target);
setTimeout(() => {
$('#fileup').click();
}, 20);
}
})
});


function getAllSrc(layers) {
let arr = [];
layers.forEach(layer => {
if (layer.src) {
arr.push({
src: layer.src,
x: layer.x,
y: layer.y
});
} else if (layer.layers) {
let newArr = getAllSrc(layer.layers);
if (newArr.length > 0) {
newArr.forEach(({
src,
x,
y
}) => {
arr.push({
src,
x: (layer.x + x),
y: (layer.y + y)
});
});
}
}
});
return arr;
}

function json(data)

{
var width = 0;
var height = 0;

let arr = getAllSrc(data.layers);

let layer1 = data.layers;
width = layer1[0].width;
height = layer1[0].height;
let counter = 0;
let table = [];

for (let {
src,
x,
y
} of arr) {
$(".container").css('width', width + "px").css('height', height + "px").addClass('temp');

var mask = $(".container").mask({
imageUrl: imageUrl,
maskImageUrl: 'https://i.imgur.com/' + src,
onMaskImageCreate: function(img) {

img.css({
"position": "absolute",
"left": x + "px",
"top": y + "px"
});

},
id: counter
});
table.push(mask);
fileup.onchange = function() {

let mask2 = table[target];
mask2.loadImage(URL.createObjectURL(fileup.files[0]));
document.getElementById('fileup').value = "";
};
counter++;
// get the text

}
drawText(data);
}

json(jsonData);
}); // end of document ready


// extempl code - get the text

const fonts = []; // caching duplicate fonts

function drawText(layer) {

if (layer.type === 'image') return;

if (!layer.type || layer.type === 'group') {
return layer.layers.forEach(drawText)
}

if (layer.type === 'text') {
const url = 'http://piccellsapp.com:1337/parse/files/PfAppId/' + layer.src;

if (!fonts.includes(url)) {
fonts.push(url);
$("style").prepend("@font-face {\n" +
"\tfont-family: \"" + layer.font + "\";\n" +
"\tsrc: url(" + url + ") format('truetype');\n" +
"}");
}

$('.container').append(
'<div class="txtContainer" ' +
'style="' +
'text-align: ' + layer.justification + '; ' +
'font-family: ' + layer.font + '; ' +
'left: ' + layer.x + 'px; ' +
'top: ' + layer.y + 'px; ' +
'width:' + layer.width + 'px; ' +
'color: ' + layer.color.replace(/^0x/, '#') + '; ' +
'font-size: ' + layer.size + 'px; ' +
'height:' + layer.height + 'px;' +
'">' +
layer.text +
'</div>');
}

}
// extempl code end



// jq plugin

(function($) {
var JQmasks = [];
$.fn.mask = function(options) {
// This is the easiest way to have default options.
var settings = $.extend({
// These are the defaults.
maskImageUrl: undefined,
imageUrl: undefined,
scale: 1,
id: new Date().getUTCMilliseconds().toString(),
x: 0, // image start position
y: 0, // image start position
onMaskImageCreate: function(div) {},
}, options);


var container = $(this);

let prevX = 0,
prevY = 0,
draggable = false,
img,
canvas,
context,
image,
timeout,
initImage = false,
startX = settings.x,
startY = settings.y,
div;

container.mousePosition = function(event) {
return {
x: event.pageX || event.offsetX,
y: event.pageY || event.offsetY
};
}

container.selected = function(ev) {
var pos = container.mousePosition(ev);
var item = $(".masked-img canvas").filter(function() {
var offset = $(this).offset()
var x = pos.x - offset.left;
var y = pos.y - offset.top;
var d = this.getContext('2d').getImageData(x, y, 1, 1).data;
return d[0] > 0
});

JQmasks.forEach(function(el) {
var id = item.length > 0 ? $(item).attr("id") : "";
if (el.id == id)
el.item.enable();
else el.item.disable();
});
};

container.enable = function() {
draggable = true;
$(canvas).attr("active", "true");
div.css({
"z-index": 2
});
}

container.disable = function() {
draggable = false;
$(canvas).attr("active", "false");
div.css({
"z-index": 1
});
}

container.onDragStart = function(evt) {
if (evt.target.getContext) {
var pixel = evt.target.getContext('2d').getImageData(evt.offsetX, evt.offsetY, 1, 1).data;

$(canvas).attr("active", "true");
container.selected(evt);
prevX = evt.clientX;
prevY = evt.clientY;
var img = new Image();
evt.originalEvent.dataTransfer.setDragImage(img, 10, 10);
evt.originalEvent.dataTransfer.setData('text/plain', 'anything');

}
};

container.getImagePosition = function() {
return {
x: settings.x,
y: settings.y,
scale: settings.scale
};
};

container.onDragOver = function(evt) {

if (evt.target.getContext) {
var pixel = evt.target.getContext('2d').getImageData(evt.offsetX, evt.offsetY, 1, 1).data;
if (pixel[3] === 255) {
if (draggable && $(canvas).attr("active") === "true") {
var x = settings.x + evt.clientX - prevX;
var y = settings.y + evt.clientY - prevY;
if (x == settings.x && y == settings.y)
return; // position has not changed
settings.x += evt.clientX - prevX;
settings.y += evt.clientY - prevY;
prevX = evt.clientX;
prevY = evt.clientY;
updateStyle();
}
} else {
evt.stopPropagation();
return false;
}
}
};

function updateStyle()
{
//context.clearRect(0, 0, canvas.width, canvas.height);
context.beginPath();
context.globalCompositeOperation = "source-over";
image = new Image();
image.setAttribute('crossOrigin', 'anonymous');
image.src = settings.maskImageUrl;
image.onload = function() {
canvas.width = image.width;
canvas.height = image.height;
context.drawImage(image, 0, 0, image.width, image.height);
div.css({
"width": image.width,
"height": image.height
});
img = new Image();
img.setAttribute('crossOrigin', 'anonymous');
img.src = settings.imageUrl;
img.onload = function() {
settings.x = settings.x == 0 && initImage ? (canvas.width - (img.width * settings.scale)) / 2 : settings.x;
settings.y = settings.y == 0 && initImage ? (canvas.height - (img.height * settings.scale)) / 2 : settings.y;
context.globalCompositeOperation = 'source-atop';
context.drawImage(img, settings.x, settings.y, img.width * settings.scale, img.height * settings.scale);
initImage = false;
};
};
};

// change the draggable image
container.loadImage = function(imageUrl) {
console.log("load");
//if (img)
// img.remove();
// reset the code.
settings.y = startY;
settings.x = startX;
prevX = prevY = 0;
settings.imageUrl = imageUrl;
initImage = true;
updateStyle();
};

// change the masked Image
function loadMaskImage(imageUrl) {
canvas = document.createElement("canvas");
context = canvas.getContext('2d');
canvas.setAttribute("draggable", "true");
canvas.setAttribute("id", settings.id);
settings.maskImageUrl = imageUrl;
div = $("<div/>", {
"class": "masked-img"
}).append(canvas);

// div.find("canvas").on('touchstart mousedown', function(event)
div.find("canvas").on('dragstart', function(event) {
if (event.handled === false) return;
event.handled = true;
container.onDragStart(event);
});

div.find("canvas").on('touchend mouseup', function(event) {
if (event.handled === false) return;
event.handled = true;
container.selected(event);
});

div.find("canvas").bind("dragover", container.onDragOver);
container.append(div);
if (settings.onMaskImageCreate)
settings.onMaskImageCreate(div);
container.loadImage(settings.imageUrl);
};
loadMaskImage(settings.maskImageUrl);
JQmasks.push({
item: container,
id: settings.id
})
return container;
};
}(jQuery));
.container {
background: gold;
position: relative;

}

.container img {
position:absolute;
top:0;
bottom:250px;
left:0;
right:0;
margin:auto;
z-index:999;
}

.masked-img {
overflow: hidden;
position: relative;
}

.txtContainer{ position:absolute; text-align:center; color:#FFF}
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>

<input id="fileup" name="fileup" type="file" style="display:none" >

<div class="container">

</div>

最佳答案

你必须为 json(data) 函数定义新的属性 name 然后你可以像这样创建条件。

if(name.indexOf('bg_image') == -1){
var imageUrl1 = imageUrl;
}else{
var imageUrl1 = '';
}

这里我更新了完整的代码:

var target;
var imageUrl = "https://i.imgur.com/As37YCl.png";

let jsonData = {
"layers" : [
{
"x" : 0,
"height" : 788,
"layers" : [
{
"x" : 0,
"height" : 788,
"src" : "lRtZPoj.jpg",
"y" : 0,
"width" : 940,
"type" : "image",
"name" : "bg_image"
}
],
"y" : 0,
"width" : 940,
"type" : "group",
"name" : "fb_post_5"
}
]
};

$(document).ready(function() {

// upload image onclick

$('.container').click(function(e) {
// filtering out non-canvas clicks
if (e.target.tagName !== 'CANVAS') return;

// getting absolute points relative to container
const absX = e.offsetX + e.target.parentNode.offsetLeft + e.currentTarget.offsetLeft;
const absY = e.offsetY + e.target.parentNode.offsetTop + e.currentTarget.offsetTop;

const $canvasList = $(this).find('canvas');
// moving all canvas parents on the same z-index
$canvasList.parent().css({zIndex: 0});

$canvasList.filter(function () { // filtering only applicable canvases
const bbox = this.getBoundingClientRect()
return (
absX >= bbox.left && absX <= bbox.left + bbox.width &&
absY >= bbox.top && absY <= bbox.top + bbox.height)
}).each(function () { // checking white in a click position
const x = absX - this.parentNode.offsetLeft - e.currentTarget.offsetLeft;
const y = absY - this.parentNode.offsetTop - e.currentTarget.offsetTop;
const pixel = this.getContext('2d').getImageData(x, y, 1, 1).data;
if (pixel[3] === 255) {
$(this).parent().css({zIndex: 2})
target = this.id;
console.log(target);
setTimeout(() => {
$('#fileup').click();
}, 20);
}
})
});


function getAllSrc(layers) {
let arr = [];
layers.forEach(layer => {
if (layer.src) {
arr.push({
src: layer.src,
x: layer.x,
y: layer.y,
name: layer.name
});
} else if (layer.layers) {
let newArr = getAllSrc(layer.layers);
if (newArr.length > 0) {
newArr.forEach(({
src,
x,
y,
name
}) => {
arr.push({
src,
x: (layer.x + x),
y: (layer.y + y),
name: (name)
});
});
}
}
});
return arr;
}

function json(data)

{
var width = 0;
var height = 0;

let arr = getAllSrc(data.layers);

let layer1 = data.layers;
width = layer1[0].width;
height = layer1[0].height;
let counter = 0;
let table = [];

for (let {
src,
x,
y,
name
} of arr) {
$(".container").css('width', width + "px").css('height', height + "px").addClass('temp');
if(name.indexOf('bg_image') == -1){
var imageUrl1 = imageUrl;
}else{
var imageUrl1 = '';
}
var mask = $(".container").mask({
imageUrl: imageUrl1,
maskImageUrl: 'https://i.imgur.com/' + src,
onMaskImageCreate: function(img) {

img.css({
"position": "absolute",
"left": x + "px",
"top": y + "px"
});

},
id: counter
});
table.push(mask);
fileup.onchange = function() {

let mask2 = table[target];
mask2.loadImage(URL.createObjectURL(fileup.files[0]));
document.getElementById('fileup').value = "";
};
counter++;
// get the text

}
drawText(data);
}

json(jsonData);
}); // end of document ready


// extempl code - get the text

const fonts = []; // caching duplicate fonts

function drawText(layer) {

if (layer.type === 'image') return;

if (!layer.type || layer.type === 'group') {
return layer.layers.forEach(drawText)
}

if (layer.type === 'text') {
const url = 'http://piccellsapp.com:1337/parse/files/PfAppId/' + layer.src;

if (!fonts.includes(url)) {
fonts.push(url);
$("style").prepend("@font-face {\n" +
"\tfont-family: \"" + layer.font + "\";\n" +
"\tsrc: url(" + url + ") format('truetype');\n" +
"}");
}

$('.container').append(
'<div class="txtContainer" ' +
'style="' +
'text-align: ' + layer.justification + '; ' +
'font-family: ' + layer.font + '; ' +
'left: ' + layer.x + 'px; ' +
'top: ' + layer.y + 'px; ' +
'width:' + layer.width + 'px; ' +
'color: ' + layer.color.replace(/^0x/, '#') + '; ' +
'font-size: ' + layer.size + 'px; ' +
'height:' + layer.height + 'px;' +
'">' +
layer.text +
'</div>');
}

}
// extempl code end



// jq plugin

(function($) {
var JQmasks = [];
$.fn.mask = function(options) {
// This is the easiest way to have default options.
var settings = $.extend({
// These are the defaults.
maskImageUrl: undefined,
imageUrl: undefined,
scale: 1,
id: new Date().getUTCMilliseconds().toString(),
x: 0, // image start position
y: 0, // image start position
onMaskImageCreate: function(div) {},
}, options);


var container = $(this);

let prevX = 0,
prevY = 0,
draggable = false,
img,
canvas,
context,
image,
timeout,
initImage = false,
startX = settings.x,
startY = settings.y,
div;

container.mousePosition = function(event) {
return {
x: event.pageX || event.offsetX,
y: event.pageY || event.offsetY
};
}

container.selected = function(ev) {
var pos = container.mousePosition(ev);
var item = $(".masked-img canvas").filter(function() {
var offset = $(this).offset()
var x = pos.x - offset.left;
var y = pos.y - offset.top;
var d = this.getContext('2d').getImageData(x, y, 1, 1).data;
return d[0] > 0
});

JQmasks.forEach(function(el) {
var id = item.length > 0 ? $(item).attr("id") : "";
if (el.id == id)
el.item.enable();
else el.item.disable();
});
};

container.enable = function() {
draggable = true;
$(canvas).attr("active", "true");
div.css({
"z-index": 2
});
}

container.disable = function() {
draggable = false;
$(canvas).attr("active", "false");
div.css({
"z-index": 1
});
}

container.onDragStart = function(evt) {
if (evt.target.getContext) {
var pixel = evt.target.getContext('2d').getImageData(evt.offsetX, evt.offsetY, 1, 1).data;

$(canvas).attr("active", "true");
container.selected(evt);
prevX = evt.clientX;
prevY = evt.clientY;
var img = new Image();
evt.originalEvent.dataTransfer.setDragImage(img, 10, 10);
evt.originalEvent.dataTransfer.setData('text/plain', 'anything');

}
};

container.getImagePosition = function() {
return {
x: settings.x,
y: settings.y,
scale: settings.scale
};
};

container.onDragOver = function(evt) {

if (evt.target.getContext) {
var pixel = evt.target.getContext('2d').getImageData(evt.offsetX, evt.offsetY, 1, 1).data;
if (pixel[3] === 255) {
if (draggable && $(canvas).attr("active") === "true") {
var x = settings.x + evt.clientX - prevX;
var y = settings.y + evt.clientY - prevY;
if (x == settings.x && y == settings.y)
return; // position has not changed
settings.x += evt.clientX - prevX;
settings.y += evt.clientY - prevY;
prevX = evt.clientX;
prevY = evt.clientY;
updateStyle();
}
} else {
evt.stopPropagation();
return false;
}
}
};

function updateStyle()
{
//context.clearRect(0, 0, canvas.width, canvas.height);
context.beginPath();
context.globalCompositeOperation = "source-over";
image = new Image();
image.setAttribute('crossOrigin', 'anonymous');
image.src = settings.maskImageUrl;
image.onload = function() {
canvas.width = image.width;
canvas.height = image.height;
context.drawImage(image, 0, 0, image.width, image.height);
div.css({
"width": image.width,
"height": image.height
});
img = new Image();
img.setAttribute('crossOrigin', 'anonymous');
img.src = settings.imageUrl;
img.onload = function() {
settings.x = settings.x == 0 && initImage ? (canvas.width - (img.width * settings.scale)) / 2 : settings.x;
settings.y = settings.y == 0 && initImage ? (canvas.height - (img.height * settings.scale)) / 2 : settings.y;
context.globalCompositeOperation = 'source-atop';
context.drawImage(img, settings.x, settings.y, img.width * settings.scale, img.height * settings.scale);
initImage = false;
};
};
};

// change the draggable image
container.loadImage = function(imageUrl) {
console.log("load");
//if (img)
// img.remove();
// reset the code.
settings.y = startY;
settings.x = startX;
prevX = prevY = 0;
settings.imageUrl = imageUrl;
initImage = true;
updateStyle();
};

// change the masked Image
function loadMaskImage(imageUrl) {
canvas = document.createElement("canvas");
context = canvas.getContext('2d');
canvas.setAttribute("draggable", "true");
canvas.setAttribute("id", settings.id);
settings.maskImageUrl = imageUrl;
div = $("<div/>", {
"class": "masked-img"
}).append(canvas);

// div.find("canvas").on('touchstart mousedown', function(event)
div.find("canvas").on('dragstart', function(event) {
if (event.handled === false) return;
event.handled = true;
container.onDragStart(event);
});

div.find("canvas").on('touchend mouseup', function(event) {
if (event.handled === false) return;
event.handled = true;
container.selected(event);
});

div.find("canvas").bind("dragover", container.onDragOver);
container.append(div);
if (settings.onMaskImageCreate)
settings.onMaskImageCreate(div);
container.loadImage(settings.imageUrl);
};
loadMaskImage(settings.maskImageUrl);
JQmasks.push({
item: container,
id: settings.id
})
return container;
};
}(jQuery));
.container {
background: gold;
position: relative;

}

.container img {
position:absolute;
top:0;
bottom:250px;
left:0;
right:0;
margin:auto;
z-index:999;
}

.masked-img {
overflow: hidden;
position: relative;
}

.txtContainer{ position:absolute; text-align:center; color:#FFF}
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>

<input id="fileup" name="fileup" type="file" style="display:none" >

<div class="container">

</div>

关于javascript - 仅在蒙版图像上显示图标,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/55297319/

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