Android绘图-阿里云

【Android 应用开发】Canvas 精准绘制文字 ( 文本边界坐标解析 | 绘图位置 )

文章目录一、文本边界坐标解析二、绘图位置一、文本边界坐标解析在上一篇博客【Android 应用开发】Canvas 精准绘制文字 ( 测量文本真实边界 | 将文本中心点与给定中心点对齐 ) 中 , 简要介绍了 Paint.getTextBounds() 函数获取的 Rect 边界 , 今天补充下精准...

6.4 Android绘图技巧(Primary：四大方法&Layer)

1.Canvas的四大金刚 Canvas.save()这个方法从字面上可以理解为保存画布，作用就是将之前的所有已绘制的图像保存起来。让后续的操作就好像在一个新的图层上操作一样，这一点与Photoshop中的图层理解基本一致。 Canvas.restore()可以理解为Photoshop中的合并图层操...

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Android：shape、XML绘图

1.线line: 1 2 3 4 5 6 7 8 <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android"  ...

从头学起android<android基本的绘图.四十六.>

在一般的图形渲染用户通常只需要重写onDraw()该方法可以是。但是假设，才能真正完成绘图操作。此外，我们需要掌握的四大核心经营类： android.graphics.Bitmap：主要表示的是一个图片的存储空间。所包括的图片能够来自于文件或由程序创建； android.graphics.Paint...

Android--使用Canvas绘图

画布Canvas 　　在Android下进行2D绘图需要Canvas类的支持，它位于"android.graphics.Canvas"包下，直译过来为画布的意思，用于完成在View上的绘图。　　　　　　Canvas为提供了两个构造函数： Canvas()：创建一个空的Canvas对象。 Canva...

Android SurfaceView 绘图覆盖刷新及脏矩形刷新方法

SurfaceView在Android中用作游戏开发是最适宜的，本文就将演示游戏开发中常用的两种绘图刷新策略在SurfaceView中的实现方法。首先我们来看一下本例需要用到的两个素材图片： bj.jpg就是一个渐变图，用作背景。 question.png是一个半透明的图像，我们希望将它放在上面，...

android:绘图 (android.graphics包)

android:绘图 View：组件，理解为画布 Drawable:所有可见对象的描述，理解为：素材类 Bitmap：图片类 Canvas：画笔 Paint：画笔样式与颜色、特效的集合近期很多网友对Android用户界面的设计表示很感兴趣，对于Android UI开发自绘控件和游戏制作而言掌握好绘...

Android应用程序窗口（Activity）的绘图表面（Surface）的创建过程分析

在前文中，我们分析了应用程序窗口连接到WindowManagerService服务的过程。在这个过程中，WindowManagerService服务会为应用程序窗口创建过一个到SurfaceFlinger服务的连接。有了这个连接之后，WindowManagerService服...

Android SurfaceView 绘图及帧频处理方法修正

帧频处理今天我在审视上篇示例代码时猛然发现我犯了个低级错误，致使帧频达不到预期，这个错误在这里：这里设置每次绘制之后固定休眠33毫秒，以此来限制每秒帧频在30帧。但实际上这里忽视了绘图及其他运算所消耗的时间，也就是说除非其他所有操作的总耗时都不足1/3毫秒，否则我们就根本无法达到每秒30帧的期...

Android绘图操作onDraw

做java的都知道，绘图肯定首先需要一个Canvas，然后在用Graphics在上面绘制自己想要图案。不错，Android上面也类似，你可以从一个Bitmap得到它的Canvas，进行绘制，也可以自定义一个View，用它的 Canvas。不同的时，Android里没有Graphics，而用 Pain...

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