/*
* 绘制几何图形
*/
import 略;
public class Ex07_02Activity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); MyView myView = new MyView(this); setContentView(myView); } private class MyView extends View { public MyView(Context context) { super(context); } // 重写onDraw()方法 protected void onDraw(Canvas canvas) { super.onDraw(canvas); // 设置背景为白色 canvas.drawColor(Color.WHITE); Paint paint = new Paint(); // 消去锯齿 paint.setAntiAlias(true); // 设置paint的颜色 paint.setColor(Color.RED); // 设置paint的style为STROKE,空心的 paint.setStyle(Paint.Style.STROKE); // 设置paint的外框宽度 paint.setStrokeWidth(3); // 画一个空心圆 canvas.drawCircle(40, 40, 30, paint); // 画一个空心正方形 canvas.drawRect(10, 90, 70, 150, paint); // 画一个空心的长方形 canvas.drawRect(10, 170, 70, 200, paint); // 画一个空心的椭圆 RectF re = new RectF(10, 220, 70, 250); canvas.drawOval(re, paint); // 画一个空心的三角形 Path path = new Path(); path.moveTo(10, 330); path.lineTo(70, 330); path.lineTo(40, 270); path.close(); canvas.drawPath(path, paint); // 画一个空心梯形 Path path1 = new Path(); path1.moveTo(10, 410); path1.lineTo(70, 410); path1.lineTo(55, 350); path1.lineTo(25, 350); path1.close(); canvas.drawPath(path1, paint); // 设置paint的颜色 paint.setColor(Color.BLUE); // 设置paint的style为FILL,实心 paint.setStyle(Paint.Style.FILL); // 画一个实心圆 canvas.drawCircle(120, 40, 30, paint); // 画一个实心正方形 canvas.drawRect(90, 90, 150, 150, paint); // 画一个实心的长方形 canvas.drawRect(90, 170, 150, 200, paint); // 画一个实心的椭圆 RectF re2 = new RectF(90, 220, 150, 250); canvas.drawOval(re2, paint); // 画一个实心的三角形 Path path2 = new Path(); path2.moveTo(90, 330); path2.lineTo(150, 330); path2.lineTo(120, 270); path2.close(); canvas.drawPath(path2, paint); // 画一个实心梯形 Path path3 = new Path(); path3.moveTo(90, 410); path3.lineTo(150, 410); path3.lineTo(135, 350); path3.lineTo(105, 350); path3.close(); canvas.drawPath(path3, paint); // 设置渐变颜色 Shader mShader = new LinearGradient(0, 0, 100, 100, new int[] { Color.RED, Color.GREEN, Color.BLUE, Color.YELLOW }, null, Shader.TileMode.REPEAT); paint.setShader(mShader); // 画一个渐变的圆 canvas.drawCircle(200, 40, 30, paint); // 画一个渐变的正方形 canvas.drawRect(170, 90, 230, 150, paint); // 画一个渐变的的长方形 canvas.drawRect(170, 170, 230, 200, paint); // 画一个渐变的的椭圆 RectF re3 = new RectF(170, 220, 230, 250); canvas.drawOval(re3, paint); // 画一个渐变的的三角形 Path path4 = new Path(); path4.moveTo(170, 330); path4.lineTo(230, 330); path4.lineTo(200, 270); path4.close(); canvas.drawPath(path4, paint); // 画一个渐变的梯形 Path path5 = new Path(); path5.moveTo(170, 410); path5.lineTo(230, 410); path5.lineTo(215, 350); path5.lineTo(185, 350); path5.close(); canvas.drawPath(path5, paint); // 写字 paint.setTextSize(24); canvas.drawText(getResources().getString(R.string.str_text1), 240, 50, paint); canvas.drawText(getResources().getString(R.string.str_text2), 240, 120, paint); canvas.drawText(getResources().getString(R.string.str_text3), 240, 190, paint); canvas.drawText(getResources().getString(R.string.str_text4), 240, 250, paint); canvas.drawText(getResources().getString(R.string.str_text5), 240, 320, paint); canvas.drawText(getResources().getString(R.string.str_text6), 240, 390, paint); } } }
下面我们来看看程序运行后的结果: