I am trying OpenTok (examples from GitHub Basic-Video-Chat )
and would like to save screenshot.
Could somebody recommend me how to do it? Probably, I should somehow get Bitmap from Subscriber view?
here is how i did in react js
if (
otCore.internalState &&
otCore.internalState.subscribers &&
otCore.internalState.subscribers.camera
) {
let streams = otCore.internalState.subscribers.camera;
let key = Object.keys(streams)[0];
let object = streams[key];
if (object) {
let imgData = object.getImgData();
let div = document.createElement("div");
div.style =
"display: flex;justify-content: center;flex-direction: column;justify-items: center;align-items: center; min-height: -webkit-fill-available;";
let img = document.createElement("img");
img.setAttribute("src", "data:image/png;base64," + imgData);
img.setAttribute("height", "60%");
img.setAttribute("width", "70%");
var imgWin = window.open("", "", "postwindow");
imgWin.document.write("<title>DstTok:Annotation</title>");
imgWin.document.write("<body style='background:#666666'></body>");
div.appendChild(img);
imgWin.document.body.appendChild(div);
}
}
}
Related
Button(
onClick = {
raceOn = !raceOn
if (raceOn) {
text.value = "Stop!"
color.value = Color.Red
} else {
text.value = "Go!"
color.value = Color.Green
}
},
modifier = Modifier.background(color = color.value),
content = {
Text(
text = "${text.value}",
)
}
)
Using the code above, I got the attached image. What I want is the inside of the button to be green and not the background behind it. I couldn't the right property to modify.
Has anyone here tried to modify the Button background? Or perhaps suggest another solution. I tried the OutlinedButton and wasn't successful.
Thanks!
Use the MaterialTheme ButtonColors.
val colors: ButtonColors = ButtonDefaults.primaryButtonColors(backgroundColor = Color.Red)
Button(onClick = { /*TODO*/ }, colors = ButtonDefaults.primaryButtonColors()) {
// TODO
}
You can also update via setting the MaterialTheme defaults.
val wearColorPalette: Colors = Colors(
primary = Purple200,
primaryVariant = Purple700,
secondary = Teal200,
secondaryVariant = Teal200,
error = Red400,
onPrimary = Color.Black,
onSecondary = Color.Black,
onError = Color.Black
)
...
MaterialTheme(
colors = wearColorPalette,
typography = Typography,
// For shapes, we generally recommend using the default Material Wear shapes which are
// optimized for round and non-round devices.
content = content
)
When we are converting creative from swf to html5 with Swiffy and as result we got clickTAG or link1 GET options to redirect url.
Because of this, we have to transmit the same data in the two settings.
Question
Can swiffy runtime replace all link1 to clickTAG so that we can pass a reference to the clickTAG!
I was found the solution
var stage = new swiffy.Stage(document.getElementById('swiffycontainer'),
swiffyobject, {});
var tmpVars = {}, flashVars = [];
var keyValues = window.location.search.substring(1).split('&');
for (var i in keyValues) {
var key = keyValues[i].split('=');
if (key.length > 1) {
tmpVars[key[0]] = key[1];
}
}
if (tmpVars.hasOwnProperty('clickTAG')) {
tmpVars.link1 = tmpVars.clickTAG;
}
for (var i in tmpVars) {
flashVars.push([i, tmpVars[i]].join('='));
}
stage.setFlashVars(flashVars.join('&'));
stage.start();
So my project was to make two gallery pages. I called them "gallery1" and "gallery2".The gallery pages each have 5 thumbnails that act like buttons so when you click on em, it opens an swf of the picture. Now the problem is, it always opens on the top left, i want them to be in the middle of the page. This is the code for gallery1. Gallery 2 is the samething but with different pics. b1-b5 are the thumbnails.Please help.
var swfRequest1:URLRequest = new URLRequest("image1.swf");
var swfRequest2:URLRequest = new URLRequest("image2.swf");
var swfRequest3:URLRequest = new URLRequest("image3.swf");
var swfRequest4:URLRequest = new URLRequest("image4.swf");
var swfRequest5:URLRequest = new URLRequest("image5.swf");
var swfLoader:Loader = new Loader();
function opengal(evt:MouseEvent):void
{
var pTarget:String = evt.currentTarget.name;
if(pTarget == "b1")
{
swfLoader.load(swfRequest1);
addChild(swfLoader);
}
else if(pTarget == "b2")
{
swfLoader.load(swfRequest2);
addChild(swfLoader);
}
else if(pTarget == "b3")
{
swfLoader.load(swfRequest3);
addChild(swfLoader);
}
else if (pTarget == "b4")
{
swfLoader.load(swfRequest4);
addChild(swfLoader);
}
else if(pTarget == "b5")
{
swfLoader.load(swfRequest5);
addChild(swfLoader);
}
};
b1.addEventListener(MouseEvent.CLICK, opengal);
b2.addEventListener(MouseEvent.CLICK, opengal);
b3.addEventListener(MouseEvent.CLICK, opengal);
b4.addEventListener(MouseEvent.CLICK, opengal);
b5.addEventListener(MouseEvent.CLICK, opengal);
To set your loaded content in the middle of your stage, you can do like this :
// store files path into an array
var files:Array = ['image01.swf', 'image02.swf', 'image03.swf', 'image04.swf', 'image05.swf'];
var loader:Loader = new Loader();
// use loader.contentLoaderInfo to listen to Event.INIT
loader.contentLoaderInfo.addEventListener(
Event.INIT, function(e:Event):void {
// center our loader
loader.x = (stage.stageWidth - loader.width)/2;
loader.y = (stage.stageHeight - loader.height)/2;
})
addChild(loader);
function opengal(evt:MouseEvent):void {
// here the pTarget should be between 0 and 4 as an array index
var pTarget:int = Number((evt.currentTarget.name).substr(-1, 1)) - 1;
loader.load(new URLRequest(files[pTarget]));
};
...
I hope this can help you.
You have to position your swfLoader in the middle of the screen.
You can do this with this code:
swfLoader.x = (swfLoader.width - stage.stageWidth)/2; // and the y axis in a similar way
The required width and height properties can be retrieved when the contentLoaderInfo dispatches an Event.INIT.
I am working on a project for my programming class. I'd like to essentially have a canvas with a background element (say a room.jpg) and then maybe three interactive objects in the room (lamp.jpg, couch.jpg, desk.jpg). I'd like for it to be that if you hover over the lamp a small box or text pops out, giving you some information. Or maybe have it so if you click an image, the same concept happens. You know, something interactive with the objects in the canvas. Again, I'm new to canvas but we have to use it in our assignment. My current code is:
function loadImages(sources, callback) {
var images = {};
var loadedImages = 0;
var numImages = 0;
// get num of sources
for(var src in sources) {
numImages++;
}
for(var src in sources) {
images[src] = new Image();
images[src].onload = function() {
if(++loadedImages >= numImages) {
callback(images);
}
};
images[src].src = sources[src];
}
}
var sources = {
room: 'room.jpg',
title: 'title.jpg'
};
loadImages(sources, function(images) {
context.drawImage(images.room, 0,0);
context.drawImage(images.title, 0,0);
});
}
But from what I understand, it makes the two jpegs a "permanent" canvas element (unable to be messed with). I had been trying to get it so that when I clicked I'd go from the title.jpg to the room.jpg but I've since given up. Essentially, all I want now is just to have the room.jpg appear when the page is first loaded, and have three other png objects on top (as objects in the room). Are these able to be interacted with, or do I have to put the images into the canvas in another way? Thanks for all your help and your patience!
// --- Image Loader ----
var images = {};
var loadedImages = 0;
var pictures = {
room: 'room.jpg',
title: 'title.jpg'
lamp1: 'lampoff.jpg'
lamp2: 'lampon.jpg'
};
function loadImages(sources, callback) {
var numImages = 0;
for(var src in sources)numImages++;
for(var src in sources) {
images[src] = new Image();
images[src].onload = function() {
if(++loadedImages >= numImages) {
callback(images);
}
};
images[src].src = sources[src];
}
}
// --- Mouse Down Functionality ----
$('#canvas').addEventListener('mouseDown', function(e){
if(e.clientX){
var rect = this.getBoundingClientRect();
if(rect) clickCanvas(e.clientX - rect.left, e.clientY - rect.top)
else clickCanvas(e.clientX - this.offsetLeft, e.clientY - this.offsetTop);
}else if(e.offsetX) clickCanvas(e.offsetX, e.offsetY);
else if(e.layerX) clickCanvas(e.layerX, e.layerY);
else console.warn("Couldn't Determine Mouse Coordinates");
})
var lampOn;
function drawCanvas(showLamp){
lampOn = showLamp;
canvas.width = canvas.width //clears canvas
context.drawImage(images.room, 0,0);
context.drawImage(images.title, 0,0);
if(lampOn){
context.drawImage(images.lamp2, 100,100);
}else{
context.drawImage(images.lamp1, 100,100);
}
}
function clickCanvas(x,y){
console.log('clicked canvas at:',x,y)
if(clickedLamp){
drawCanvas(!lampOn)
}
}
loadImages(pictures, function(images) {
drawCanvas(false)
});
Make sure to replace "clickedLamp" and "#canvas"! The idea here is that you redraw the same canvas, using the same function. Everytime you modify any of it, you rerender ALL of it. See if you can get this example working, it will help clarify alot. If you don't understand something comment
I want to merge 2 images using node.js. Or rather, i want to place one smaller image on cordinates x,y on a larger image.
Even more precise: I have an image of glasses, and an image of a face and i want to put the glasses on the face.
I did some googling, and found some image manipulating libraries, but none seem to be able to merge images.
You might need this: https://github.com/zhangyuanwei/node-images
Cross-platform image decoder(png/jpeg/gif) and encoder(png/jpeg) for Nodejs
images("big.jpg").draw(images("small.jpg"), 10, 10).save("output.jpg");
I do no have enough reputation to add a comment, or else I would to Schmidko's answer.
Sharp works well, however, overlayWith is deprecated and you instead need to use composite. See below:
sharp(path + 'example.jpg')
.composite([{input: path + 'logo.png', gravity: 'southeast' }])
.toFile(path + 'output.png');
If you would like to center the image being overlayed:
gravity: 'centre'
I've used:
https://github.com/learnboost/node-canvas
to do something similar (build a composite image from components on the fly).
It works great.
Here's some example code:
var Canvas = require('canvas'),
fs = require('fs'),
Image = Canvas.Image;
var _components = [{prefix:'f', count:12},
{prefix:'h', count:12},
{prefix:'i', count:12},
{prefix:'m', count:12}];
var _total = 1;
for (var i=_components.length - 1; i>=0; i--){
_components[i].mult = _total;
_total *= _components[i].count;
}
module.exports.ensureImageExists = function(img, cb){
fs.stat(__dirname + '/../public/images/rb/' + img, function(err, stats){
if (err){
if (err.code == 'ENOENT')
generateImage(img, cb);
else
cb(err);
}
else{
cb();
}
});
}
function generateImage(name, cb){
var re = /rb([0-9]*)\.png/
var num = parseInt(re.exec(name)[1]) % _total;
var parts = [];
for (var i=0; i<_components.length; i++){
var n = Math.floor(num / _components[i].mult);
parts.push(_components[i].prefix + (n + 1));
num -= n * _components[i].mult;
}
var canvas = new Canvas(45, 45),
ctx = canvas.getContext('2d');
drawParts();
function drawParts(){
var part = parts.shift();
if (!part)
saveCanvas();
else {
var img = new Image;
img.onload = function(){
ctx.drawImage(img, 0, 0, 45, 45);
drawParts();
};
img.src = __dirname + '/components/' + part + '.png';
}
}
function saveCanvas(){
canvas.toBuffer(function(err, buf){
if (err)
cb(err);
else
fs.writeFile(__dirname + '/../public/images/rb/' + name, buf, function(){
cb();
});
});
}
}
In this case, the components are selected based upon the name of the image, but you clearly could do otherwise. Also, I imagine you could just stream the image out if you wanted -- I write it to a file so it's available the next time it's requested.
I put a route like this in to handle the generation:
app.get('/images/rb/:img', requireLogin, function(req, res, next){
//first make sure image exists, then pass along so it is handled
//by the static router
rbgen.ensureImageExists(req.params.img, function(err){
next();
})
});
Tested some librarys for a similar task and implemented finally this one.
https://github.com/lovell/sharp.
Clean API and all you need to merge two images together.
Example:
sharp(path + 'example.jpg')
.overlayWith(path + 'label.png', { gravity: sharp.gravity.southeast } )
.toFile(path + 'output.png')