draw erd

First, let's take a look at cgcontextref: An opaque type that represents a quartz 2D drawing environment. Graphics context is a graphical context. It can be understood as a canvas. We can draw a canvas on it. After the painting is complete, place the canvas in our view for display, view is a frame. I hope to help you with the demo I implemented when I learned it myself. For specific implementation, I can see the code and provide a perfect explanation.

member function Performtraversals of the Viewroot class to initiate the measurement, Layout and drawing operations, these three operations are implemented by the member functions of the Decorview class, measure and layout, and the member function draw of the Viewroot class, respectively.Next, we will analyze the measurement, layout, and drawing process of the Android application window, starting with the member functions measure and layout of the Dec

The most flexible way to draw a uiview is to finish drawing it yourself. In fact, you are not drawing a uiview, you just subclass the UIView and give the child the ability to draw their own. When a uiview needs to perform a drawing operation, theDrawRect: method is called. Overriding this method gives you the chance to get a drawing operation. When the DrawRect: method is called, the current graphics contex

created page. New layer, we try to paint as many layers, easy to modify, can save a lot of time. Figure 1-2 2 Drafts Draft to now mind the idea of what the whole picture wants to express, this painting wants to draw into the bright sunshine, the little princess in the Lotus pond next to want to kiss the frog, and left in the side peeping Prince, full of naughty fun. After the picture is drawn in the new layer, we

This article is about how to draw segments with canvas, and then we'll look at specific content and hopefully help you. To learn canvas, first you need to know how to draw line segments, and then through a lot of simple lines to achieve more complex graphics, such as common chart, histogram, line chart, etc. are through a segment of the line to achieve. Basic knowledge Canvas basic knowledge is not much,

When you start the game, you must be reminded to reduce the draw call and, of course, unity is no exception, open the Stats in the game window and see the numbers of draw calls and batched. But what exactly is Draw call? Is the effect coming from the CPU? or GPU? Let Unityin once tell you.First, let's define what "Draw

Comments: This article describes how to draw Rectangles and circles in a canvas. They are basic images. Of course, there are more than basic graphics, but in canvas, only rectangular and circular shapes do not need to be simulated using other methods, interested friends can understand how to draw Rectangles and circles in the canvas. They are basic images. Of course, there are more than basic graphics, but

What if you want a video chat but don't have a webcam? Don't worry, it's for everyone! Start fireworks and create a new 450*400 size canvas. Select the Ellipse tool in the tools panel and draw a 179*179 circle on the canvas. The stroke color of the circle is then set to colorless in the properties panel. In the Fill category, select Oval in the gradient option, and then set up three color sliders in the fill-color preselection box with the color

Note after reading: 1. Learn the writing structure of similar articles A first writes an official introduction to this product and his own understanding of it. B. Let's talk about the product features and deep understanding of this product. For example, this article shows draw well that social games will become the development trend of the game market in the future. C. Finally, I will talk about my understanding of the future development direction of

Problem In most cases, you want to draw another image on multiple images. The main problem is that if all the images cover the screen completely, they will overwrite the previous image. Make sure that you first draw the background image. Solution With xNa, you can specify layers or the depth of the image. The image at the maximum depth is first drawn. Most image formats support transparency. This means

Link: http://docs.eoeandroid.com/training/graphics/opengl/draw.html After defining the shape to be drawn with OpenGL, you may want to draw them on the screen. Drawing these shapes based on OpenGL ES 2.0 requires a little more code than you think, because the 2.0 API provides a lot of control over the image rendering pipeline. This section describes how to use the OpenGL ES 2.0 API to draw the shape you have

What is Draw Calls?First, let's look at what is called "Draw Calls": A draw call, which is equal to calling a drawindexedprimitive (DX) or gldrawelements (OGL), equals a Batch.People who have touched DirectX or OpenGL, the API for drawindexedprimitive and gldrawelements must be familiar. When we prepare the data (usually the vertex information of the triangle) fo

This article describes how to use the TIKZ macro package to draw a flowchart. \usepackage{tikz} \usetikzlibrary{arrows,shapes,chains} Same as picture, also included in \begin{figure}...\end{figure}. The drawing flowchart is divided into two steps, and the first step is to define the control style. To give an example, define a rectangular box: \tikzstyle{process} = [Rectangle, Minimum width = 3cm, Minimum height = 1cm, text centered,

Introduction The learning of UML started on the 3rd and ended on the evening of the 13th. Today (Nov 14), I reviewed UML and refined the following learning tasks. The overall learning of UML is similar, but there are still many areas to be improved. Learning Process At the beginning of UML learning, I first spent half a day on the concept of UML. The main method is to query materials and watch books online, and then watch the UML video, during the watching process, I watched the video quickly. A

1. The first one is about mobile-adaptive problems:A: If it is the last time a canvas-generated picture, rather than the canvas that you want to draw, you do not need to consider adaptive, draw canvas when the width of the height, can be directly written to the UI provided by the size of the graph, such as the UI provides a graph is 750 * 1280, When the canvas is drawn, all the data can beTo 375*640 to calc

In FLASH or PHOTOSHOP, you can easily draw a circle or an ellipse. How can you create a work so that you can drag the mouse inside to draw a circle or an ellipse? The following is an explanation of BreakDS's use of AS to achieve this effect -- Preview: I. basic definition: although everyone knows it, I 'd like to talk about it so that some people may not forget it ~~ Circle: the trajectory of a point with

Preface: Read the JS book canvas that picture today, good happy ~ is the beloved canvas~ oh yes ~Before I saw someone suggested that I paint blue fat, oh, how can I forget my childhood favorite blue fat, in order to express my apology to the blue fat, so today drew a moving Hello World, also is a kind of progress ~All right, everyone, please get in the car, please do not block the passage, thank you. Let's drive.Body:Let's see how it works today.Today's blue fat long so, see it still so fat, I w

http://my.oschina.net/sweetdark/blog/161002Learning the knowledge of drawing lines, we can use Gl_line_loop to draw closed polygons. But in this way, only the wireframe is drawn, and the polygon has no fill color. OpenGL supports drawing a solid polygon and fills it with the current color.TriangleFor a simple triangle, you need to specify three vertices. 1:glbegin (Gl_triangles); 2: glvertex2f (0.0f, 0.0f); V0 3: glvertex2f (2

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Some time ago, for you to explain how in fireworks to draw QQ Skin Tutorial examples, I believe that we have been harvested. This time we use fireworks with the GIF animation production function, for you to explain the dynamic QQ expression production. Thus also personalized QQ to carry out in the end! In our daily life, people's expressions are included in the "Emotions". But in the online QQ chat, the usable expression action is rich and colorful,