canvas drawarc android example

Note: This article translated from: http://developer.android.com/guide/topics/graphics/2d-graphics.html The android framework API provides a set of 2D plotting APIs that can render custom images on a canvas and modify existing view objects, to customize their appearance and visual effects. When drawing a 2D image, you usually need to use one of the following two methods: 1. Draw a graph or animation to a vi

simple metaphor: If you compare an Android interface to a window, then each view is a piece of glass, the whole frame is viewgroup, and the pattern on each piece of glass is what we call canvas, If there is no Canvas we can not see anything (only transparent glass), and receive all kinds of event processing or by the glass (View) receive processing, notice refre

[Book Note: Android game programming starts from scratch] 12. Game Development BASICS (Canvas), Learning android from scratch 1. Canvas Canvas of the Canvas class encapsulates graphics and image painting. Common functions of this

This example describes the canvas of Android programming to draw various graphics. Share to everyone for your reference, specific as follows: 1, first of all say canvas class: Class Overview The Canvas class holds the "draw" calls. To draw something, your need 4 basic com

the activity background color was white. In this example, after the new layer is drawn, the target color of the rectangle is also reset to the transparent color (0,0,0,0), so that the whole new layer is only 3/4 of the circle is not transparent, the rest of the pixels are all transparent, We then call Canvas.restoretocount () to draw the layer again onto the canvas. When you draw a new layer to the

Objective Android custom controls often use canvas to draw 2D graphics and must be proficient in canvas drawing mechanisms before optimizing their own custom control skills. This paper explains the canvas drawing mechanism from the following three aspects: Canvas CanvasBru

){Super (context ); Int x= 10;Int y= 10;Int width= 300;Int height= 50; Mdrawable= Newshapedrawable (newovalshape ());Mdrawable. getpaint (). setcolor (0xff74ac23 );Mdrawable. setbounds (X,Y, X+ Width, y+ Height );} ProtectedvoidOndraw (canvas ){Mdrawable. Draw (canvas );}}In the constructor in the above example, shapedrawable is defined as an ovalshape object, a

four is the Paint object.DrawOval (RECTF oval, paint paint)//Draw ellipse, parameter one is scan area, parameter two is Paint object;Drawcircle (float CX, float CY, float radius,paint paint)//Draw circle, parameter one is the X axis of center point, parameter two is the Y axis of center point, parameter is radius, parameter four is Paint object;DrawArc (RECTF oval, float startangle, float sweepAngle, Boolean usecenter, Paint paint)//arc, parameter on

OverviewWhen writing an application, it is important to properly determine your graphics needs. different graphic tasks correspond to different technologies. for example, the implementation of graphics and animation for a static application must be very different from that for an interactive game. here, we will discuss some operations for Drawing Images on android and their most suitable tasks.

There is a Canvas class in Android. The Canvas class represents a Canvas. You can draw what you want on it. Of course, you can also set canvas attributes, the color/size of the canvas, and so on.

, the x-axis horizontal position of the three end of the parameter, Parameter four the vertical position of the y-axis, and the last parameter is the paint brush object.Drawpoint (float x, float y, paint paint)//Draw point, parameter one horizontal x axis, parameter two vertical y axis, third parameter is paint object.DrawText (string text, float x, floaty, paint paint)//rendered text, canvas class In addition to the above can also depict text, parame

inheriting SurfaceView. You can use the implements interfaces Runnable and SurfaceHolder. Callback. The second interface needs to overload three functions. These three functions are the life cycle processing of SurfaceView. You can pass the implemented Callback object through the addCallback () method of the SurfaceHolder object. 3)When using the SurfaceView Canvas, remember to lock the synchronization, because the