by   wuyr Java Version: Current License: Apache-2.0

kandi X-RAY | CanvasX Summary

kandi X-RAY | CanvasX Summary

CanvasX is a Java library. CanvasX has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. However CanvasX build file is not available. You can download it from GitHub.

脱离Android模拟器,在Java程序中使用Android下的Canvas、Paint、Bitmap等Graphics类(提取自Android Studio)

            kandi-support Support

              CanvasX has a low active ecosystem.
              It has 29 star(s) with 1 fork(s). There are 2 watchers for this library.
              It had no major release in the last 6 months.
              CanvasX has no issues reported. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of CanvasX is current.

            kandi-Quality Quality

              CanvasX has 0 bugs and 0 code smells.

            kandi-Security Security

              CanvasX has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              CanvasX code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              CanvasX is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              CanvasX releases are not available. You will need to build from source code and install.
              CanvasX has no build file. You will be need to create the build yourself to build the component from source.
              Installation instructions are not available. Examples and code snippets are available.
              CanvasX saves you 29 person hours of effort in developing the same functionality from scratch.
              It has 79 lines of code, 1 functions and 3 files.
              It has low code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi's functional review helps you automatically verify the functionalities of the libraries and avoid rework.
            Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of CanvasX
            Get all kandi verified functions for this library.

            CanvasX Key Features

            No Key Features are available at this moment for CanvasX.

            CanvasX Examples and Code Snippets

            No Code Snippets are available at this moment for CanvasX.

            Community Discussions


            Two equidistant points from a random coordinate without breaking cavas constraints
            Asked 2021-Apr-23 at 19:23

            My variables are:

            • canvasX - This is the horizontal size of the canvas being drawn on. (user picks)

            • 1stX - My first point, determined at random, within canvasX. (something like: random(0, canvasX))

            • rando - A random number to determine the distance the next 2 points are from 1stX.

            • 2ndXleft - an equidistant point from 1stX to the left. (basically 1stX - rando)

            • 2ndXright - an equidistant point from the 1stX to the right. (basically 1stX + rando)

            I've got a canvas I'm drawing on and I want a point picked out with a random variable for x. I then want two more points but these need to have the x coordinate be equidistant from the first. I also want for these points to always be within the canvas.

            So, if my canvas size is 1000, and my 1stX is 100, the max distance for rando would have to be 100. same is my 1stX was 900.

            rando is my problem, how do I figure out what that distance can be?



            Answered 2021-Apr-23 at 18:10

            The simplest would possibly be the following



            How to change Stroke color once the box is filled with current color
            Asked 2021-Feb-21 at 01:24

            I have this design description to create:

            Step 1: Default state is type on white background.

            Step 2: Cursor tracks and you draw.

            Step 3: If you fill the whole screen red, then cursor draw changes to white colour.

            Step 4: You draw in white.

            Step 5: If you fill the full screen with the drawing, you're back to step 1 with a full white background.

            I have completed the task till Step 2 but unable to change color once entire screen is filled with red color.

            So in short, Once the users fills the box with red color, I want to change the color to white. And in same way once the box is filled with white color I want to change it back to red.

            Please check the codepen for code -



            Answered 2021-Feb-21 at 01:24

            You need verify each pixel value and compare to red color or white color (RGB value).

            Use the ctx.getImageData to get array of color. This array have a length = width * height * 4 size, cause it save 4 information: r, g, b and a. So turn a loop with i+4 interation. In interation you can work with i, i+1 and i+2 to get r, g and b.

            Red is R=255, G=0, B=0 White is R=255, G=255, GB=255



            What's the difference between an inner class and an inner inner class in python?
            Asked 2020-Dec-20 at 04:16

            Shouldn't field be undefined on line 50? It was my understanding that inner nested classes did not have visibility to outer classes, as I ran into on line 65... Just seems kind of inconsistent and I would love to have a better understanding of the outer nested classes visibility to avoid any confusion in the future.



            Answered 2020-Dec-18 at 03:32

            I've write very simplified example:



            what happens when you define a function?
            Asked 2020-Dec-11 at 00:49

            I found a beautiful script for making a snipp from actual window here on Stackoverflow and I'd love to use it in the personal application that I'm creating. But I think I'm missing something big here and I don't understand why it's not working.



            Answered 2020-Dec-11 at 00:06


            KonvaJS always center text in label
            Asked 2020-Dec-05 at 11:05

            I apologize for the code, it's in a state I'm actively playing with.

            In Konva JS, I'm creating labels. Which is basically a group, it has a shape and text element. The shapes are drawn dynamically from a database, and each db row has the coordinates, the shape (square, circle etc), size and rotation. These are multiplied by a scale depending on screen size. I had a working solution, which I've been using for weeks, but I also have a function that changes the shape of a shape. So I press a button, it updates the database (e.g changes square to circle) and then redraws the canvas. Because going from a square to a circle changes from a shape that's drawn from the top left to one that's drawn from center, it messes up the coordinates. I decided to switch to drawing rectangles with an offset of width/2 so that rectangles are drawn from the center too.

            I have subsequently kept breaking it further and I now can't get text centered at all. I need text centered regardless of shape, size or rotation.

            current code



            Answered 2020-Dec-05 at 11:05

            I slightly rewrote your creation routine; seems working well like this. The essence here is that shape + label are grouped together and global [scaled] position is applied to those groups, not individual graphic elements.




            Keeping track of each point of each polygon on a canvas with tkinter
            Asked 2020-Dec-01 at 02:37

            I'm making and UI for a Tangram (puzzle with different polygons) using tkinter in Python and I'd like to keep track of the coordinates of each point of each polygon when they move around my canvas.

            To do so, I created this class:



            Answered 2020-Nov-30 at 20:17
            canvas.bind('', self.start_movement)
            canvas.bind('', self.movement)
            canvas.bind('', self.stopMovement)
            canvas.bind('', self.rotate)



            When and why do I need to change a window coordinate to a canvas coordinate?
            Asked 2020-Nov-21 at 18:50

            I tried to see the difference between a window coordinate and a canvas coordinate by giving a canvas a callback that prints the coordinates of a mouse click in both types. I expected the two types of coordinates to have different values, but they didn't. Also, I tried to pass window coordinates to the find_closest method which, as stated in the documentation, accepts canvas coordinates, and there was no error.



            Answered 2020-Nov-21 at 18:50

            You only need to do the conversion if your canvas is able to scroll. Otherwise there's a 1:1 mapping between window and canvas coordinates.

            You can see this by adding the following code to your example, at some point after creating the canvas:



            Cube gets a little bigger when i draw it again. (Canvas, Javascript)
            Asked 2020-Oct-19 at 20:05



            Answered 2020-Oct-19 at 20:05
            You were tricked by the thickness of the border

            The border has a thickness, which is easy to forget. If you draw a box which is X wide, its left and right border are in addition to the width of X.

            So if you do NOT fill the interior, you get this nice appearance (left), but if you FILL, you get this ugly appearance (right).

            When you draw a grid of these squares, each one covers over the right-hand and bottom sides of previous squares, so that it is not obvious what is happening.

            Unless you redraw one that is not the last of the list, as I have done here (bottom-middle). Then it becomes obvious that something is wrong.

            Here is the code to reproduce the above figures, and below I recommend a solution.



            Can not draw rectangle at exact points on a canvas using mouse when the page is scroll able
            Asked 2020-Aug-22 at 10:42

            Although the code work just fine if we draw the rectangle without scrolling the canvas or page. But in case we do scrolling, the rectangle do not appear on the screen from the point where we start to drag the mouse.



            Answered 2020-Aug-22 at 10:42

            Using this answer to compute the mouse position, it works great. It takes the scrolling into consideration.



            Where to put addEventListener so it doesn't fire multiple times
            Asked 2020-Jul-27 at 09:01

            I've got a Javascript file which draws a canvas with circles. If I click on a circle, the color must change. This works, but the eventHandler fires many times with one click. Because of this, the program lags a lot. How do I improve this?



            Answered 2020-Jul-27 at 09:01

            Currently, you are adding an event listener on every draw cycle because of where you're calling addEventListener. If you instead move addEventListener to the constructor of the circle, it will only be attached once per Circle object (in your case, 64 times):


            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install CanvasX

            You can download it from GitHub.
            You can use CanvasX like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the CanvasX component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer For Gradle installation, please refer .


            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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