canvas

Programmatically select object in a Fabricjs canvas from coords

由 ε祈祈猫儿з 提交于 2020-01-03 02:45:33
问题 I've been stuck with this for so long now. I'm using a Fabricjs canvas as a texture for a 3D model in Three.js. The model renders the canvas as a texture every time there's a change on it. I would like to click on the model and programmatically select an item on the Fabricjs canvas. I achieved to transform the 3d coords to the Fabric 2D coords with a raycaster, so I can add new items to the canvas clicking directly on the model. But I can't find the way to select a canvas object clicking on

how to send HTML5 canvas image with email

由 空扰寡人 提交于 2020-01-03 02:43:11
问题 First I try'd doing it with Mail_mime from Pear, but I can't load the class from my shared host provider and cpanel. Next I followed directions from this post .It writes the image to the "temp" folder but it writes zero bytes. Obviously the question is, what am I missing. Somewhere I read about converting + signs in the encoded string, but i'm not sure? The main problem is how to send the canvas image with email, I don't have a complete knowledge for going about that. I followed some posts

Fabric.js layering text over Images on a Canvas

由 China☆狼群 提交于 2020-01-03 01:22:47
问题 So, I've just recently begun working with HTML5 and canvases , I'm currently working with fabric.js . But, I ran into an issue, and after spending the last 12 hours trying different things, I've decided to come here for help, so here it is: Using fabric.js, I've layered a bunch of images to make it how I want, but now I want to be able to write over those images using fabric.js. I can only get it to write either all of them in the write spot, but wrong z-position(the words end up all BELOW

Android AdMob Banner add on top of Canvas?

由 半腔热情 提交于 2020-01-03 01:10:18
问题 I have created a small game using Canvas, and now I want to display AdMob ads on top of the canvas. The Example on the AdMob site suggests I do the following: // Create an ad. adView = new AdView(this); adView.setAdSize(AdSize.BANNER); adView.setAdUnitId(AD_UNIT_ID); // Add the AdView to the view hierarchy. The view will have no size // until the ad is loaded. LinearLayout layout = (LinearLayout) findViewById(R.id.linearLayout); layout.addView(adView); However, I am setting the contentView to

Grow square div with color based on the percentage value provided

由 与世无争的帅哥 提交于 2020-01-02 21:57:15
问题 I am working on a square graph animation. The squares should grow from zero on the x/y axis(top left corner) to their determined percent size with ease. Can anyone provide me any hints to accomplish this? This is what I have so far: http://jsfiddle.net/2n6kduL4/3/ The progress is happening from left to right. But it has to fill from the left top corner to the right bottom corner. var canvas = document.getElementById('myProgress'); var myPerc = 500; ctx = canvas.getContext('2d'); ctx.fillStyle

Empty JPEG image (DNL not supported) node-canvas

由 安稳与你 提交于 2020-01-02 19:59:30
问题 I am trying to use node-canvas to crop a background image and i am running into some a weird error with the following code. The error is "[Error: error while writing to output stream]". If i use the crop example code from the node-canvas repo i get this error "Empty JPEG image (DNL not supported)" /* */ var cnv = new Canvas(w,h), ctx = cnv.getContext('2d'), original = '/img/pages/'+page+'/background.jpg'; ctx.imageSmoothingEnabled = true; fs.readFile('public/'+original, function( err,image){

微信小程序绘制canvas图片

由 谁说我不能喝 提交于 2020-01-02 19:09:27
1.效果图 2.注意事项 1.https网址图片需要预先下载到本地用wx.downloadFile方法 2.wx.downloadFile需要在微信公众号后台配置域名才能获取图片，如图： 3.代码 1.wxml canvas.wxml <cover-view bindtap='savePic'> <canvas style="width:100%;height:{{contentHeight}}px" canvas-id="myCanvas" bindlongpress="savePic"> </canvas> </cover-view> <button bindtap='savePic' class="buttonStyle">预览并发送</button> 2.js代码 1.图片需要先下载到本地，并保存本地图片路径，包括头像，头像图片的域名同样要在后台配置，不然发布线上获取不到。 canvas.js var util = require('../../utils/md5.js'); var tool = require('../../utils/base64tool.js') var app = new getApp(); //canvas.js Page({ data: { windowWidth: 0, //屏幕宽度 windowHeight: 0,//屏幕高度

JavaScript Canvas - change smoothly rgb

由 烈酒焚心 提交于 2020-01-02 17:16:50
问题 I'm trying to change color of a rectangle from 'yellow' to 'blue'. I use for it fillStyle with rgb. var canvas = document.getElementById('mycanvas'), ctx = document.getElementById('mycanvas').getContext('2d'), red = 255, blue = 0, green = 179, inc = 2; function animate(){ ctx.clearRect(0,0,canvas.width,canvas.height); ctx.beginPath(); ctx.rect(100, 100, 100, 100); ctx.fillStyle = 'rgb('+ red +','+ green +','+ blue +')'; ctx.fill(); ctx.closePath(); red = Math.min(Math.max(red - inc, 36))

HTML5: Inverse text-color on canvas

由 浪尽此生 提交于 2020-01-02 14:33:21
问题 I want to draw text on a canvas in the inverse color of the background (to make sure the text is readible no matter the background color). I believe in oldskool bitblt-ing, this was an XOR operation. How to do this? 回答1: I've removed my old answer, as it did not solve the question. As of recently, there are new globalCompositeOperation s that do all kinds of great things. I've created an example that shows how to obtain inverted text. In case that link breaks, the method is essentially this:

HTML5: Inverse text-color on canvas

由 蓝咒 提交于 2020-01-02 14:31:51
问题 I want to draw text on a canvas in the inverse color of the background (to make sure the text is readible no matter the background color). I believe in oldskool bitblt-ing, this was an XOR operation. How to do this? 回答1: I've removed my old answer, as it did not solve the question. As of recently, there are new globalCompositeOperation s that do all kinds of great things. I've created an example that shows how to obtain inverted text. In case that link breaks, the method is essentially this:
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