drawing views

Introduction to VC double buffer Drawing Technology and vc buffer drawing Double-buffered plotting is a basic graphic image plotting technology. First, it creates an object in the memory that is consistent with the screen drawing area, and then draws the image to this object in the memory, finally, copy and display the graphic data on this object to the scree

Introduction to coordinate systemIllustrates the Java coordinate system. The coordinate origin is in the upper-left corner, in pixels, which is the smallest display unit on the computer screen. In the Java coordinate system, the first is the x-coordinate, which indicates that the current position is horizontal, the origin of the coordinates is x pixels, and the second is the y-coordinate, which indicates that the current position is in the vertical direction, and y pixels from the origin of the

PrefaceAn excellent application is not only to have attractive features and interactions, but also to have high performance requirements. Mobile phone running Android system, although the configuration in the continuous upgrade, but still can not be compared with the PC, the PC does not have the same large memory and high-performance CPU, so in the development of Android applications can not be unlimited use of CPU and memory, Improper use of CPU and memory can also cause problems such as applic

In the previous articles, I have introduced how to use GDI + for drawing and made an example. In this article, I will introduce how to use a tool similar to Windows for drawing.I personally think that if you want to create a powerful drawing tool, it is far from enough to simply master GDI. At present, I can only do a simple drawing tool. you are welcome to discu

call Requesfocus () if you want to force the focus to be set.* Set Listener: The view allows the client to set the listener, which is notified when related events occur on the view. For example, allows you to set a listener for the view to get focus gain and loss notifications. You can register the focus listener via Setonfocuschangelistener (Android.view.View.OnFocusChangeListener). Other view subclasses may provide more specific listeners. For example, a button exposes a listener that is used

() method in sequence, that is, dispatchDraw () is used to draw the UI of all child views of the ViewGroup () different. Because ViewGroup has implemented the dispatchDraw () method, in most cases, the ViewGroup subclass does not need to be rewritten, such as PhoneWindow $ DecorView, RelativeLayout, FrameLayout, and RelativeLayout.NoOverride the dispatchDraw () method. Only in rare cases can we rewrite the dispatchDraw () method of ViewGroup to meet

How can I attract my sister-in-law's attention? There is no way to draw a pencil drawing. Nowadays, the popular pencil drawing effect is very popular among many sisters and is also a high performance, today, I organized a tutorial on converting images to pencil drawing effects to attract the attention of my sisters? There is no way to draw a pencil

Original address: http://android.xsoftlab.net/training/graphics/opengl/draw.htmlIf you don't know how to define graphics and coordinate systems, please visit: Android Official Development document Training Series Course Chinese version: Graphic definition of OpenGL drawing.After defining the graphic, all you need to do next is draw it to the screen. However, using the OpenGL ES 2.0 API to draw this graph may require more code than you might think, because the API provides a lot of control detail

1.1 Quartz 2D drawing, 1.1quartz2d drawing Quartz2D drawing steps: 1. Get the [graphic context] Object -- (get draft paper) 2. Add [path] 2.1 splicing path (painting content) 2.2 to the context (put the content on the draft paper) to the [graphic context] object) 3. rendering -- (draw the image in the [graphic context] to the corres

Article Source: http://www.objc.io/issue-3/scroll-view.htmlIssue #3 views, August 2013 ByJoe Conway It may be hard to believe, butUIScrollViewIsn' t much different than a standardUIView. Sure, the scroll view has a few more methods, but those methods are really just facades of existingUIViewProperties. Thus, most of the understanding of how a uiscrollview works comes from understandingUIView-Specifically, the details of the two-step view rendering pro

one, for reference:This paper draws on the understanding of this paper's algorithm in the summer of Csdn: Wind-blown summer's image pencil drawing algorithm, and the home page of the paper written by people such as Cewu Lu, the Chinese University of Hong Kong. The original author and blogger Wind up the summer has given code, but the code is not complete. After I read the original paper and the blogger's article, basically, the idea of the approximate

This article by Harry _ Spider-Man original, reproduced please indicate the source! If you have any questions, please contact [email protected]This time we continue to tell Jim Adams old brother's RPG Programming book Second edition of Chapter 8th: Using Fonts (use fonts), and section 9th: Billboards (Billboard). The two sections are not much, so put it in one issue.Original translation:=============================================================================== 2.8 Using Fonts ( use fonts )

How can I quickly open the drawing and locate the CAD online? Now many friends know how to use the CAD view software to open the CAD drawings and measure the drawing distance, but some friends do not want to download and install the CAD view software on the computer desktop. Then you can view the image online. How can I open a CAD drawing with an online view? And

How to close a layer in a CAD Drawing in a CAD drawing? In the CAD industry, when we open a new CAD drawing file for viewing, if we want to know where each layer is, you need to close some layers that do not need to be searched, but how to close a layer in the CAD drawing in the CAD view graph? How can I perform this o

1. Introduction to the three major mapping systems of R1.1 Basic drawing System (base plotting systems)-Artist's palette: drawing suitable for blank canvas· need to implement plans; visualize the logic of drawing and analyzing data in real time-Two steps = figure + Modify/Add = Perform a series of functions-Suitable for drawi