canvas

问题 How can I submit Canvas content inside a PHP CodeIgniter form? One of the inputs on my form is a Canvas for a drawing or webcam photo. I created a tag <input name="picture" type="hidden"> and set its value to the base64 content: myPictureInput.value = canvas.toDataURL(); However, when the user submits the form, the POST value read from the <input> is truncated to 64kb. Is there an optimal way to post or submit images together with form data? 回答1: As mentioned in this answer, you should send

问题 I've been using Thomas J. Bradley's jQuery Signature Pad plugin for capturing drawn signatures and it works well. What I'd like to do is also allow typed signatures as shown in demo but have it output the same data as a drawn signature (JSON representation). Since the data output is actual coordinates of the cursor as it moves over the canvas, I'm guessing it would have to emulate that mouse or touch movement. I found another Stackoverflow answer about drawing text on the canvas. Is there a

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 7 years ago . Improve this question I write this javascript code : context.shadowOffsetX = 5; context.shadowOffsetY = 5; context.shadowBlur = 4; context.shadowColor = 'rgba(255, 0, 0, 0.5)'; context.fillStyle = '#f00'; context.fillRect(x, y, w, h); I add this script on a photo , I want see the color of image ,

问题 I am trying to create an effect with Fabric JS where letters appear to be "embroidered" on a sweater like this: I can achieve this effect in Photoshop by using this action. My idea for getting it into a <canvas> is to render out a png from Photoshop of every embroidered letter. Then, I will take each letter and place it on the canvas based on what the user types. However this approach will not have correct kerning. To fix this, I was trying to write out text in Fabric using the same font and

问题 I am trying to create an effect with Fabric JS where letters appear to be "embroidered" on a sweater like this: I can achieve this effect in Photoshop by using this action. My idea for getting it into a <canvas> is to render out a png from Photoshop of every embroidered letter. Then, I will take each letter and place it on the canvas based on what the user types. However this approach will not have correct kerning. To fix this, I was trying to write out text in Fabric using the same font and

问题 I am trying to create an effect with Fabric JS where letters appear to be "embroidered" on a sweater like this: I can achieve this effect in Photoshop by using this action. My idea for getting it into a <canvas> is to render out a png from Photoshop of every embroidered letter. Then, I will take each letter and place it on the canvas based on what the user types. However this approach will not have correct kerning. To fix this, I was trying to write out text in Fabric using the same font and

问题 I am trying to create an effect with Fabric JS where letters appear to be "embroidered" on a sweater like this: I can achieve this effect in Photoshop by using this action. My idea for getting it into a <canvas> is to render out a png from Photoshop of every embroidered letter. Then, I will take each letter and place it on the canvas based on what the user types. However this approach will not have correct kerning. To fix this, I was trying to write out text in Fabric using the same font and

问题 I need help with discord.py. I've been creating a bot on python, so I wanted to make a canvas profile card with this bot. The problem is, I did not find anything in google about it, only node.js. I do not want to rewrite my bot and I'd like to make a profile card like example: juniperbot, mee6. Help me with it please! 回答1: I don't know jupiterbot nor mee6 but if canvas means Image manipulation with Canvas in documentation for discord.js then it is used only to generate image and simply send()

问题 This question has been asked a lot, but I just don't understand why this is happening to me. Basically, I have a canvas, and an image, and when I try to do this: var canvas = document.getElementById('somecanvas'); var ctx = canvas.getContext('2d'); var someimage = document.createElement('img'); someimage.setAttribute('src', 'img/someimage.png'); someimage.onload = function(){ ctx.drawImage(someimage, 0, 0, canvas.width, canvas.height); data = ctx.getImageData(0,0,canvas.width,canvas.height);

问题 This question has been asked a lot, but I just don't understand why this is happening to me. Basically, I have a canvas, and an image, and when I try to do this: var canvas = document.getElementById('somecanvas'); var ctx = canvas.getContext('2d'); var someimage = document.createElement('img'); someimage.setAttribute('src', 'img/someimage.png'); someimage.onload = function(){ ctx.drawImage(someimage, 0, 0, canvas.width, canvas.height); data = ctx.getImageData(0,0,canvas.width,canvas.height);