Android绘图Canvas、Paint类基本用法
2015-08-03 23:14
363 查看
这些用法都是英文的字面意思,所以解释部分就放在代码的注释那里了,要画图,就要继承View类重写onDraw方法,要注意的是构造方法也重写一下吧,话不多说直接上代码~~~
import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.LinearGradient; import android.graphics.Paint; import android.graphics.Path; import android.graphics.RectF; import android.graphics.Shader; import android.util.AttributeSet; import android.view.View; public class MyView extends View { public MyView(Context context, AttributeSet set) { super(context, set); } @Override //重写该方法进行绘图 protected void onDraw(Canvas canvas) { super.onDraw(canvas); //把整张画布绘制成白色 canvas.drawColor(Color.WHITE); Paint paint = new Paint(); //去锯齿 paint.setAntiAlias(true); //设置画笔颜色 paint.setColor(Color.BLUE); //设置画笔风格 paint.setStyle(Paint.Style.STROKE); //设置画笔大小 paint.setStrokeWidth(3); //绘制圆形,这里cx,cy参数是指圆心的坐标,更JavaSE的不一样 canvas.drawCircle(40, 40, 30, paint); //绘制正方形(左上 、右下) canvas.drawRect(10, 80, 70, 140, paint); //绘制矩形 canvas.drawRect(10, 150, 70, 190, paint); //绘制圆角矩形 RectF re1 = new RectF(10, 200, 70, 230); //下面方法参数解释 //rx The x-radius of the oval used to round the corners //ry The y-radius of the oval used to round the corners canvas.drawRoundRect(re1, 15, 15, paint); //绘制椭圆 RectF re11 = new RectF(10, 240, 70, 270); canvas.drawOval(re11, paint); //绘制三角形--需要定义一个Path对象来绘制路径 Path path1 = new Path(); path1.moveTo(10, 340); path1.lineTo(70, 340); path1.lineTo(40, 290); path1.close(); canvas.drawPath(path1, paint); //绘制五边形--需要定义一个Path对象来绘制路径 Path path2 = new Path(); path2.moveTo(26, 360); path2.lineTo(54, 360); path2.lineTo(70, 392); path2.lineTo(40, 420); path2.lineTo(10, 392); path2.close(); canvas.drawPath(path2, paint); //改变风格再绘制 paint.setStyle(Paint.Style.FILL); paint.setColor(Color.RED); //绘制圆形 canvas.drawCircle(120, 40, 30, paint); //绘制正方形 canvas.drawRect(90, 80, 150, 140, paint); //绘制矩形 canvas.drawRect(90, 150, 150, 190, paint); //绘制圆角矩形 RectF re2 = new RectF(90, 200, 150, 230); canvas.drawRoundRect(re2, 15, 15, paint); //绘制椭圆 RectF re21 = new RectF(90, 240, 150, 270); canvas.drawOval(re21, paint); //绘制三角形 Path path3 = new Path(); path3.moveTo(90, 340); path3.lineTo(150, 340); path3.lineTo(120, 290); path3.close(); canvas.drawPath(path3, paint); //绘制五角形 Path path4 = new Path(); path4.moveTo(106, 360); path4.lineTo(134, 360); path4.lineTo(150, 392); path4.lineTo(120, 420); path4.lineTo(90, 392); path4.close(); canvas.drawPath(path4, paint); //改变样式--设置渐变 Shader mShader = new LinearGradient(0, 0, 40, 60, new int[]{Color.RED, Color.GREEN, Color.BLUE, Color.YELLOW}, null, Shader.TileMode.REPEAT); paint.setShader(mShader); //设置阴影 paint.setShadowLayer(45, 10, 10, Color.GRAY); //绘制圆形 canvas.drawCircle(200, 40, 30, paint); //绘制正方形 canvas.drawRect(170, 80, 230, 140, paint); //绘制圆角矩形 RectF re3 = new RectF(); canvas.drawRoundRect(re3, 15, 15, paint); //绘制椭圆 RectF re31 = new RectF(170, 240, 230, 270); canvas.drawOval(re31, paint); //绘制三角形 Path path5 = new Path(); path5.moveTo(170, 340); path5.lineTo(230, 340); path5.lineTo(200, 290); path5.close(); canvas.drawPath(path5, paint); //绘制五边形 Path path6 = new Path(); path6.moveTo(186, 360); path6.moveTo(214, 360); path6.moveTo(230, 392); path6.moveTo(200, 420); path6.moveTo(170, 392); path6.close(); canvas.drawPath(path6, paint); //改变风格,绘制字体 paint.setTextSize(10); paint.setShader(null); // canvas.drawText(getResources().getString(R.string.circle), 240, 50, paint); canvas.drawText(getResources().getString(R.string.square), 240, 120, paint); // canvas.drawText(getResources().getString(R.string.rect), 240, 175, paint); // canvas.drawText(getResources().getString(R.string.round_rect), 230, 220, paint); // canvas.drawText(getResources().getString(R.string.oval), 240, 260, paint); // canvas.drawText(getResources().getString(R.string.triangle), 240, 325, paint); // canvas.drawText(getResources().getString(R.string.pentagon), 240, 390, paint); } }
相关文章推荐
- 关闭Android 应用的三种方法
- Android 实例:通过自定义View组件实现跟随手指移动的小兔子
- Android Hotpatch系列之-项目介绍
- Android推送 百度云推送 入门篇
- Android基础之Activity四种启动模式和task相关
- Android真机获取root权限,进入data目录
- android动态添加view
- Android 中Junit 测试框架(单元测试)
- Android四大组件之BroadcastReceiver
- Android Dalvik模式下劫持 Java 函数
- 今天发现一个android动画合集,明天开始研究
- Android Binder 分析——多线程支持
- android广播和短信广播详解----使用广播接收者监听短信
- Android获取屏幕宽度与长度的三个方法
- Android中多线程编程(四)AsyncTask类的详细解释(附源码)
- android 中int 和 String 互相转换的多种方法
- Android SDK下载网址
- android 源码下载中遇到的问题 repo sync
- 关于android:showAsAction
- Android之Inflate()方法用途