Recent questions tagged Canvas

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canvas - Drawing line less than one pixel thick requires anti-aliasing in Android 4.2

I'm trying to draw a very thin line (less than one pixel thick) in android. I'm using Paint blackThin = new ... the same. Thanks for the help! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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474 views

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canvas - Is it an anti-pattern to modify JavaScript's built-in prototypes?

I understand from this post, that it's an anti-pattern to modify Object's prototype in JavaScript. I was ... this against 'best practices' ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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475 views

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canvas - Text smear effect in JavaScript

I'm pretty experienced with Javascript but haven't delved much into its advanced graphics capabilities (canvas, webGL ... . Thanks in advance! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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742 views

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canvas - Empty PDF report is generated when we have multiple graphs using html2canvas and jsPDF library

I have two flot charts in One page , and with the code below, I want to use jsPDF to create report ... I use html2canvas and jsPDF libraries. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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550 views

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canvas - Java: plot points based on distances

I need to plot a group of points based on distances. I have three unknown points X, Y, and Z. I then get another ... , XZ, YZ, AB, AC, etc. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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604 views

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canvas - Android Convert view to BitMap

I'm trying to convert a view to bitmap but I lose the black color. I'm converting like this: Bitmap ... is not lost? Thanks, Regards See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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683 views

1 answer

canvas - Copy and crop images in Javascript

I'm trying to create a small 2D game in Javascript/Canvas which consists of several animated sprites. I'd like ... time due to network latency. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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400 views

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canvas - Python Tkinter: Tree selection

I have created 2 trees with idlelib.TreeWidget in Canvas, left and right. I am also able to print out the name ... == '__main__': main() See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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419 views

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canvas - Setting multiple custom elements to MultiAutoCompleteTextView : Android

Continuing from my previous post, I was able to set multiple elements to the MultiAutoCompleteTextView but I was ... look something like this See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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428 views

1 answer

canvas - Setting multiple custom elements to MultiAutoCompleteTextView : Android

Continuing from my previous post, I was able to set multiple elements to the MultiAutoCompleteTextView but I was ... look something like this See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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456 views

1 answer

canvas - Why does omitting beginPath() redraw everything?

Without context.beginPath(); the 10px red stroke at the top is redrawn as a 30px green stroke, even though the 30px ... "; context.stroke(); }; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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468 views

1 answer

canvas - HTML crossorigin attribute for img tag

I am trying to understand how to use the crossorigin attribute for the img tag. I couldn't find a good ... attribute with the img tag? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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505 views

1 answer

canvas unable to generate bmp image dataurl in chrome

I have code to draw image from video. Here is the code <script type="text/javascript"> function capture() { ... url is generated in bmp format. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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446 views

1 answer

canvas - How to draw on Bitmap in android?

I'm trying to figure out how to draw on a bitmap in android, and keep a copy of these changed bitmaps ... 'm going about this entirely wrong. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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413 views

1 answer

canvas - Android: Howto use clipRect in API15

i have a problem with a custom view with running on api 15 (Android 4.0.3) the code: canvas.clipRect(10,10, ... and 9... Thanks for your help See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

870 views

1 answer

canvas - Crop image by polygon area in Java

by using Canvas and JS I can draw a shape like this and have the x,y of each point : Tha area can be choosen ... . Which lib in java I can use? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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779 views

1 answer

canvas - Either drawImage or paintImage doesn't work properly in Flutter

I basically want to show an image that I have in the assets folder onto the canvas. import 'package:flutter/ ... with ui.Image. Please advise. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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672 views

1 answer

canvas - Collision detection between a line and a circle in JavaScript

I'm looking for a definitive answer, maybe a function cos I'm slow, that will determine if a line segment and ... but they are over my head. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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836 views

1 answer

canvas - Three.js: how to keep sprite text size unchanged when zooming

In three.js, when the mouse is zoomed, the text will be magnified and reduced accordingly. var texture = new ... when the mouse is zoomed? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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333 views

1 answer

canvas - WPF for LCD screen Full HD

I am developing a WPF application that will be displayed in a Full-HD LCD screen (42 inch). In addition, ... practice to accomplish this task? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

426 views

1 answer

canvas - create Bitmap from byteArray in android

I want to create a bitmap from a bytearray . I tried the following codes Bitmap bmp; bmp = BitmapFactory. ... an byteArray. Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

416 views

1 answer

canvas - Merge two bitmaps in android

I want to merge two bitmaps, here is my code // Camera arg conversion to Bitmap Bitmap cameraBitmap = BitmapFactory. ... me. Any idea.? Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

387 views

1 answer

canvas - Calculate exact characterstring height in javascript

I'm working with canvases and i can't think of any solution, or find answer on line to my problem. I have ... anyone help me with this ? Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

486 views

1 answer

canvas - Replace one color using SVG filters

Is it possible to take an IMG picture and replace one exact color to another, say #fff to #000, keeping all ... from SVG filters can help? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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950 views

1 answer

canvas - Tkinter create image function error (pyimage1 does not exist)

I'm a student from the outside world with no previous programming experience. I have been learning Python as ... (root) root.mainloop() See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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707 views

1 answer

canvas - matplotlib and PyQt: Dynamic figure runs slow after several loads or looks messy

EDIT: I decided to rewrite this to include a working example of my problem. Although this is pretty long, I ... more than welcome. Thank you. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

282 views

1 answer

canvas - How to Include CSS style when converting svg to png

i've created a simple SVG elment that get dowbloaded to png when clicking on a button, my solution is similiar to here ... ; img.src = url; }); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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