android canvas draw

Yesterday we mentioned the ondraw method in the details of the three views on the android game development journey. For detailed implementation, we will mainly talk about the use of canvas and painting objects for Android today. The canvas class mainly implements the Screen Painting Process, including many practical me

[Android] custom View, Canvas and Paint brush, androidcanvas Android custom View is actually very simple. This View can use Java code to generate a series of components, just like "Android" uses Java code layout and buttons to add and click events "(click to open a link. You can also use it with

The usual Android application development in the picture, look for art design some pictures, put in the project on it, but in addition to using existing images, we can also use 2D drawing, is to draw some patterns or text in view. The classes that are commonly used are canvas (canvas), Paint (brush) and color (used to

The process of cutting the canvas for Android is not very difficult, but it is difficult to understand. Here I will write my understanding but it is not necessarily correct:Canvas. cliprect (30, 30, 70, 70, region. op. XOR); the last parameter has multiple options: // difference is the first time different from the second display.// Replace is displayed for the second time// Reverse_difference is the second

The process of cutting the canvas for Android is not very difficult, but it is difficult to understand. Here I will write my understanding but it is not necessarily correct:Canvas. cliprect (30, 30, 70, 70, region. op. XOR); the last parameter has multiple options: // difference is the first time different from the second display.// Replace is displayed for the second time// Reverse_difference is the second

In Android, you need to display 2D graphics through the graphics class.The graphics include commonly used classes such as canvas, paint (brush), color (colors), Bitmap (image), and so on. Graphics have features such as drawing points, lines, colors, 2D geometries, and image processing.Canvas:void DrawRect (RECTF rect, paint paint)//plot area, parameter one for RECTF one areavoid DrawPath (path path, paint p

Android plotting mechanism: canvas initial solution Canvas refers to "Canvas", which is used for 2D painting in Android.When using canvas for drawing, a View is usually customized to override its onDraw method: public class CustomCanvas extends View { public CustomCanvas

); Canvas.drawtext (MText, (mwidth-txtlength)/2,rectbottomy + 40,p); Super.ondraw (canvas);This completes the drawing of the entire view.The following is to be done for the convenience of users. Provides some methods for setting properties./** * Set percentage * @param percent * /public void setpercent (int percent) { mpercent = percent; Invalidate (); } /** * Set Text * @param text * /pu

angle * * canvas.rotate (); /** * to (100,100) as the center, rotate 30 degrees, clockwise direction is the positive direction * Parameters: Rotation angle * * canvas.rotate (30,100,100); Five, canvas operation example Paint p = new Paint (); P.setcolor (Color.argb (50,255,100,100)); Canvas.drawrect (0,0,200,200,P); Draw a rectangle with the original

(Android) canvas movement and flip Android canvas flip is a powerful tool, especially in image processing. You can easily change the origin without having to reverse the array with a bunch of linear changes.Just like the sauce purple, at the beginning, the canvas sister ove

Draw two views of the Android group-English notes series (1 ). 3. view rendering 1. Usage: the drawing is completed by inheriting the view and rewriting its onDraw () method. 2. Specific implementation: A. First define a Canvas object, which is similar to a Canvas. The definition method is as follows:

Android uses a touch to dynamically draw a rectangle and an android rectangle on the screen.Requirement Overview: Draw an area with your finger on the screen and return the coordinates of the area in the circle.Technical implementation: Customize the View, set the paint brush and corresponding parameters, and judge the

When customizing the control and using the Surfaceview to lock the canvas with Serfaceholder to draw the game, the tank picture needs to be drawn according to the direction of the tank, so the canvas's rotate (float Degrees) method, tried many times to cause the picture on the screen to be a mess, not according to the imagination. After a lot of attempts finally mastered a rule:The

I have been studying this problem for the past two or three days. Today I have finally succeeded. The final result I want to achieve is that when I press the button for the first time when taking a photo like a camera, a rectangle box will appear and I don't want to take a photo. If I press it again, the face will be framed again, draw a new rectangle. That's simple. Misunderstanding 1: I have set a cleardraw () sub-function and set it in the sub-func

number whose absolute value is the distance the font draws the boundary to baseline.So if the text is drawn in a rectangle with a fontmetrics height, the DrawText should pass in the-fontmetrics.top.To draw the center position of the Targetrect, the baseline formula is:Targetrect.top + (Targetrect.bottom-targetrect.top)/2-(fontmetrics.bottom-fontmetrics.top)/2-fontmetrics.topSolution:So the initial code should be changed (by adding the horizontal cent

Target:Draws the Chinese character to the center of the target rectangle.Questions:Android Canvas drawing, origin in the DrawText is based on baseline, directly to the target rectangle bottom into DrawText, the character position will be lower. Write the code like this:[Java]View Plaincopy print? @Override Public void OnDraw (canvas canvas) { Rect targ

Android custom control Series 3: How to draw In the previous chapter, we talked about how to define attributes and how to define the width and height, so that the simple shape or outline of the component is displayed, or the size of the canvas has been defined, the solution is how to make a splash on the canvas. Compon

protected void OnDraw (canvas canvas) {//TODO auto-generated method Stubsuper.ondraw (canvas);//construction of two brushes, one red, one green paint Paint_green = Generatepaint (Color.green, Style.stroke, 3); Paint paint_red = Generatepaint (color.red, Style.stroke, 3);//Constructs a rectangle rect rect1 = new Rect (0,0,400,220);//

Create a simple canvas for Android multimedia development and learning A simple canvas can be drawn, selected, and saved. Of course, this tool is commonly used in communication software, such as QQ and feiqiu. Among them, we must listen to the touch events of the fingers. The touch events of the fingers are divided into three types: Press, lift, and move. Usually

Using Bitmap as Canvas material for Android ImagesOverview When Bitmap is used as the canvas material, the following pattern can be drawn: Demo /*** Image Processing: Painting on Bitmap */public class MyBitMapViewSec extends View {private int width; private int height; private Paint mPaintCircle; private Paint mPaintRect; private Bitmap mBitmap; private