Tag:Mapping

  • HTML5 canvas basic drawing: drawing Pentagram

    Time:2021-4-18

    <canvas></canvas>It is a new tag added in HTML5 for drawing graphics. In fact, like other tags, this tag is special in that it can obtain a canvasrenderingcontext2d object, which can be controlled by JavaScript script for drawing. <canvas></canvas>It’s just a container for drawing graphics. In addition to ID, class, style and other attributes, there are […]

  • Drawing line of HTML5 canvas basic drawing

    Time:2021-4-17

    <canvas></canvas>It is a new tag added in HTML5 for drawing graphics. In fact, like other tags, this tag is special in that it can obtain a canvasrenderingcontext2d object, which can be controlled by JavaScript script for drawing. <canvas></canvas>It’s just a container for drawing graphics. In addition to ID, class, style and other attributes, there are […]

  • The implementation of fill pattern in HTML5 canvas basic drawing

    Time:2021-4-16

    <canvas></canvas>It is a new tag added in HTML5 for drawing graphics. In fact, like other tags, this tag is special in that it can obtain a canvasrenderingcontext2d object, which can be controlled by JavaScript script for drawing. <canvas></canvas>It’s just a container for drawing graphics. In addition to ID, class, style and other attributes, there are […]

  • The most complete 11 network security mind maps in history!

    Time:2021-4-12

    Network security means that the hardware, software and data in the network system are protected from damage, change and leakage due to accidental or malicious reasons. The system runs continuously and reliably without interruption of network service. It has the characteristics of confidentiality, integrity, availability, controllability and auditability. This paper sorts out the mind map […]

  • Memos for pandas data visualization

    Time:2021-4-11

    By Rashida nasrin suckyCompile VKSource: towards Data Science We use Python’s pandas library mainly for data operation in data analysis, but we can also use pandas for data visualization. You don’t even need to import the Matplotlib library for this. Pandas itself can use Matplotlib on the back end and visualize it for you. It […]

  • Learning canvas from a Sketchpad demo

    Time:2021-4-11

    preface I started to learn canvas and made a Sketchpad application,The address is here. This article is some basic ideas and considerations of canvas, not basic API. It mainly lies in the practical experience of touch event Retina screen compatible Retina screen will use multiple physical pixels to render an independent pixel, resulting in double […]

  • The foundation of canvas

    Time:2021-3-27

    After watching SVG essentials for half a month, and then watching HTML5 + canvas basic course, I feel that most of the content is relatively easy. Many methods of canvas and element attributes of SVG have very similar functions. I’ve been busy with the project a while ago, and it took less than a week […]

  • Coordinate system and deformation of canvas

    Time:2021-3-25

    I feel that the drawing in the second chapter of the book is a little bit messy. It doesn’t seem to fit in. I plan to split it into three parts Coordinate system and deformation Path drawing Rendering Coordinate systemDeformation is the basis of canvas drawing, and deformation is closely related to coordinate system.Path drawingIs […]

  • All relationships of swift usernotification related classes unnotificaitoncenter [map]

    Time:2021-3-22

    Swifionusernotification Center Sort it outUserNotificationAll the class attributes and relationships in the kit. How to use Create a new notification firstUNNotificationRequest Add notification contentUNNotificationContent Add notification triggerUNNotificationTrigger obtainUNNotificationCenterInstance, and addUNNotificationRequest If you need to display the action button in the notification, you need to create a new oneUNNotificationCategory Add the required buttons to the categoryUNNotificationAction […]

  • How to use Matplotlib plt.pause The dynamic drawing window could not be closed

    Time:2021-3-17

    Solution: judge whether the drawing window is closed in the loop, and exit the dynamic drawing loop if it is closed When PLT generates a figure object, it needs to specify an ID of type int (if not specified, it will be generated automatically inside PLT). The figure object can be obtained through this ID […]

  • Pyqt5 drawing board

    Time:2021-3-11

    Pyqt5 drawing board Main technology PyQt5 qtDesigner openCV major function painting paint brush Paint bucket straight line rectangle ellipse eraser Image processing Rotate and flip Brightness, saturation, contrast and tone adjustment Graying Binarization Reverse phase relief edge detection vague sharpening Detailed code GitHub warehouse Problems encountered in the implementation process Using qtdesigner on pychar Configure […]

  • The most complete Linux / C / C + + learning route (mind map), please collect!

    Time:2021-3-1

    1. Know Linux If you feel inconvenient to view, it doesn’t matter. Brother migrant workers has packed these pictures and uploaded them to the Internet disk for you to downloadThe way of migrant workers’ TechnologyOfficial account replyLinux mind mapYou can get the download link for free. 2. Linux command 3. Linux learning path 4. Introduction […]