android图形绘制

package irdc.ex07_02; /* import相关class */ import android.app.Activity; 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.os.Bundle; import android.view.View; public class EX07_02 extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); /* 设定ContentView为自定义的MyView */ MyView myView = new MyView(this); setContentView(myView); } /* 自定义继承View的MyView */ private class MyView extends View { public MyView(Context context) { super(context); } /* 覆写onDraw() */ @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); /* 设定背景为白色 */ canvas.drawColor(Color.WHITE); Paint paint = new Paint(); /* 去锯齿 */ paint.setAntiAlias(true); /* 设定paint的颜色 */ paint.setColor(Color.RED); /* 设定paint的style为STROKE：空心的 */ paint.setStyle(Paint.Style.STROKE); /* 设定paint的外框宽度 */ paint.setStrokeWidth(3); /* 画一个空心圆形 */ canvas.drawCircle(40,40,30, paint); /* 画一个空心正方形 */ canvas.drawRect(10,90,70,150,paint); /* 画一个空心长方形 */ canvas.drawRect(10,170,70,200,paint); /* 画一个空心椭圆形 */ RectF re=new RectF(10,220,70,250); canvas.drawOval(re, paint); /* 画一个空心三角形 */ 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); /* 设定paint的style为FILL：实心 */ paint.setStyle(Paint.Style.FILL); /* 设定paint的颜色 */ paint.setColor(Color.BLUE); /* 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); /* 画一个实心长方形 */ canvas.drawRect(90,170,150,200,paint); /* 画一个实心椭圆形 */ RectF re2=new RectF(90,220,150,250); canvas.drawOval(re2, paint); /* 画一个实心三角形 */ 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); /* 设定渐层色 */ 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); /* 画一个渐层色的圆形 */ canvas.drawCircle(200,40, 30, paint); /* 画一个渐层色的正方形 */ canvas.drawRect(170,90,230,150,paint); /* 画一个渐层色的长方形 */ canvas.drawRect(170,170,230,200,paint); /* 画一个渐层色的椭圆形 */ RectF re3=new RectF(170,220,230,250); canvas.drawOval(re3, paint); /* 画一个渐层色的三角形 */ Path path4 = new Path(); path4.moveTo(170,330); path4.lineTo(230,330); path4.lineTo(200,270); path4.close(); canvas.drawPath(path4, paint); /* 画一个渐层色的梯形 */ 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); } } }