form1.java

巴特渥斯滤波器设计(butterworth),根据设计参数需要,设计出符合要求的滤波器,并提供示意图

import com.ms.wfc.app.*;
import com.ms.wfc.core.*;
import com.ms.wfc.ui.*;
import com.ms.wfc.html.*;

public class Form1 extends Form
{
	
public boolean ok=false;
public int rank;//数字滤波器的阶数
public double Qc;//数字滤波器的截至频率
public complex P[],A[];//（从序号0开始）//记录极点位置；记录系统函数Ha（S）部分分式形式的分解系数；
public complex Br[],Ak[];//标准差分方程的系数参数（从0开始定义）
public double K0;//归一化常数

	
	public Form1()
	{
		
		super();
		initForm();	
		
		      
	}

	
	public void dispose()
	{
		super.dispose();
		components.dispose();
		
	}


private void button3_click(Object source, Event e)
{
	new help().showDialog();
}

private void button4_click(Object source, Event e)
{
	new aboutme().showDialog();
}

private void button1_click(Object source, Event e)
{
	int rankx;//备用，存储计算出来的阶数如果合格就赋值给rank
	double Qcx;
	iirfilterset myframe=new iirfilterset();
	int result=myframe.showDialog();
	if(result==DialogResult.OK){
		//System.out.print("FUCK!");
		double w1=0.01*myframe.trackBar1.getValue()*Math.PI;
		double w2=0.01*myframe.trackBar3.getValue()*Math.PI;
		double a=0.1*myframe.trackBar2.getValue();
		double b=0.1*myframe.trackBar4.getValue();
		double nn=(Math.log(Math.pow(10,a/10)-1)-Math.log(Math.pow(10,b/10)-1))/(2*Math.log(w1/w2));
		double nnn=nn;
		int nnnn=(int)nnn;
		double nnnnn=nnnn;
		if(nnnnn-nn==0)rankx=(int)nn;
		else rankx=(int)(nn+1);
		Qcx=w1/Math.pow(Math.pow(10,a/10)-1,1/(double)(2*rankx));
		rank=rankx;//合格！接受此值
			Qc=Qcx;
			MessageBox.show("计算结果：滤波器阶数N＝"+String.valueOf(rank)+"，截止频率Ωc＝"+String.valueOf(Qc)+'\n'+"祝贺你，滤波器参数初始化成功！","提示",MessageBox.ICONINFORMATION);
			//求出极点位置
			P=new complex[rank];
			K0=1;//归一化常数
			for(int i=0;i<rank;i++){
				P[i]=new complex();
				P[i].Re=Qc*Math.cos(Math.PI*(0.5+(double)(2*i+1)/(double)(2*rank)));
				P[i].Im=Qc*Math.sin(Math.PI*(0.5+(double)(2*i+1)/(double)(2*rank)));
				//System.out.println("P["+i+"]=("+P[i].Re+")+("+P[i].Im+")");
				K0*=Math.sqrt(P[i].Re*P[i].Re+P[i].Im*P[i].Im);
			}
			this.edit1.setText(String.valueOf(K0));
			String s="";
			for(int i=0;i<P.length;i++){
				s+="[S-("+P[i].Re+((P[i].Im<0)?"-j":"+j")+Math.abs(P[i].Im)+"]";
			}
			this.edit2.setText(s);
			ok=true;
			this.panel.invalidate();
				
		
	}
}

private void panel_paint(Object source, PaintEvent e)
{
	if(ok){
	    int x0=10;
		int y0=this.panel.getHeight()-20;
		int height=y0-10;
		int width=this.panel.getWidth()-x0-10;
		//绘制坐标	
		e.graphics.setPen(new Pen(Color.WHITE,PenStyle.SOLID,2));
		for(int i=0;i<=10;i++){//横向10格纵向10格
			e.graphics.drawLine(x0,y0-height*i/10,x0+width,y0-height*i/10);//横向
			e.graphics.drawLine(x0+width*i/10,y0-height,x0+width*i/10,y0);//纵向
		}
		//绘制文字
		e.graphics.setTextColor(Color.WHITE);
		//for(int i=0;i<=5;i++){//纵向写6个
			//e.graphics.drawString(String.valueOf(-i*20)+"dB",5,5+height*i/5);
	//	}
		e.graphics.drawString("0",x0-5,y0+5);//纵向写6个
		for(int i=1;i<5;i++){
			e.graphics.drawString(String.valueOf((float)(0.2*i))+"π",x0+width*i/5-10,5+y0);
		}
		e.graphics.drawString("π",x0+width-5,y0+5);
		//画数据
		e.graphics.setPen(new Pen(Color.GREEN,PenStyle.SOLID,2));
		double MAX=0;
		for(double w=0;w<=Math.PI;w+=0.01){
			double xx=K0;
			for(int i=0;i<P.length;i++){
				xx/=Math.sqrt(P[i].Re*P[i].Re+(w-P[i].Im)*(w-P[i].Im));
				
			}//for
			if(Math.abs(10*Math.log(xx))>=MAX){
				MAX=Math.abs(10*Math.log(xx));
			}
		}		
		for(double w=0;w<=Math.PI;w+=0.01){
			double xx=K0;
			double nextxx=K0;
			for(int i=0;i<P.length;i++){
				xx/=Math.sqrt(P[i].Re*P[i].Re+(w-P[i].Im)*(w-P[i].Im));
				//if(i<P.length-1){
				nextxx/=Math.sqrt(P[i].Re*P[i].Re+((w+0.01)-P[i].Im)*(w+0.01-P[i].Im));
				//}
			}//for
			e.graphics.drawLine(x0+(int)(width*w/Math.PI),10-(int)(10*Math.log(xx)*height/MAX),x0+(int)(width*(w+0.01)/Math.PI),10-(int)(10*Math.log(nextxx)*height/MAX));
		}//for
		double xx=K0;
		for(int i=0;i<P.length;i++)	xx/=Math.sqrt(P[i].Re*P[i].Re+(Qc-P[i].Im)*(Qc-P[i].Im));
		//e.graphics.
		//e.graphics.setPixel(x0+(int)(width*Qc/Math.PI),10-(int)(10*Math.log(xx)*height/100),Color.RED);
		e.graphics.setPen(new Pen(Color.RED,PenStyle.SOLID,2));
		e.graphics.drawLine(x0+(int)(width*Qc/Math.PI)-2,10-(int)(10*Math.log(xx)*height/MAX)-2,x0+(int)(width*Qc/Math.PI)+2,10-(int)(10*Math.log(xx)*height/MAX)+2);
		e.graphics.drawLine(x0+(int)(width*Qc/Math.PI)-2,10-(int)(10*Math.log(xx)*height/MAX)+2,x0+(int)(width*Qc/Math.PI)+2,10-(int)(10*Math.log(xx)*height/MAX)-2);
	}
}

private void panel_mouseMove(Object source, MouseEvent e)
{
	
	if(e.x>=10&&e.x<=this.panel.getWidth()-10&&ok){
		double xx=K0;
		double w=(double)(e.x-10)/(double)(this.panel.getWidth()-20)*Math.PI;
		for(int i=0;i<P.length;i++)
			xx/=Math.sqrt(P[i].Re*P[i].Re+(w-P[i].Im)*(w-P[i].Im));
		xx=10*Math.log(xx);
		this.toolTip1.setToolTip(panel,"ω="+String.valueOf((float)(e.x-10)/(float)(this.panel.getWidth()-20))+"π，Hdb(ω)="+xx+"dB");
		}
	
	
}

Container components = new Container();
Button button1 = new Button();
GroupBox groupBox3 = new GroupBox();
Button button4 = new Button();
StatusBarPanel statusBarPanel1 = new StatusBarPanel();
StatusBarPanel statusBarPanel2 = new StatusBarPanel();
StatusBarPanel statusBarPanel3 = new StatusBarPanel();
StatusBarPanel statusBarPanel4 = new StatusBarPanel();
StatusBarPanel statusBarPanel5 = new StatusBarPanel();
StatusBarPanel statusBarPanel6 = new StatusBarPanel();
StatusBarPanel statusBarPanel7 = new StatusBarPanel();
GroupBox groupBox1 = new GroupBox();
Button button3 = new Button();
GroupBox groupBox2 = new GroupBox();
Label label1 = new Label();
Label label2 = new Label();
Edit edit1 = new Edit();
Edit edit2 = new Edit();
GroupBox groupBox4 = new GroupBox();
Panel panel = new Panel();
ToolTip toolTip1 = new ToolTip(components);

private void initForm()
{
	// NOTE:  This form is storing resource information in an
	// external file.  Do not modify the string parameter to any
	// resources.getObject() function call. For example, do not
	// modify "foo1_location" in the following line of code
	// even if the name of the Foo object changes: 
	//   foo1.setLocation((Point)resources.getObject("foo1_location"));

	IResourceManager resources = new ResourceManager(this, "Form1");
	this.setText("Design of butterworth filter");
	this.setAutoScaleBaseSize(new Point(6, 12));
	this.setBorderStyle(FormBorderStyle.FIXED_DIALOG);
	this.setClientSize(new Point(840, 455));
	this.setIcon((Icon)resources.getObject("this_icon"));
	this.setMaximizeBox(false);
	this.setMinimizeBox(false);
	this.setStartPosition(FormStartPosition.CENTER_SCREEN);

	button1.setLocation(new Point(40, 40));
	button1.setSize(new Point(168, 24));
	button1.setTabIndex(0);
	button1.setText("Low-pass filter setting");
	button1.addOnClick(new EventHandler(this.button1_click));

	groupBox3.setLocation(new Point(592, 304));
	groupBox3.setSize(new Point(240, 144));
	groupBox3.setTabIndex(2);
	groupBox3.setTabStop(false);
	groupBox3.setText("information");

	button4.setLocation(new Point(40, 80));
	button4.setSize(new Point(168, 24));
	button4.setTabIndex(0);
	button4.setText("&About Me");
	button4.addOnClick(new EventHandler(this.button4_click));

	statusBarPanel1.setText("statusBarPanel1");

	statusBarPanel2.setText("statusBarPanel2");

	statusBarPanel3.setText("statusBarPanel3");

	statusBarPanel4.setText("statusBarPanel4");

	statusBarPanel5.setText("statusBarPanel5");

	statusBarPanel6.setText("statusBarPanel6");

	statusBarPanel7.setText("statusBarPanel7");

	groupBox1.setLocation(new Point(592, 8));
	groupBox1.setSize(new Point(240, 120));
	groupBox1.setTabIndex(0);
	groupBox1.setTabStop(false);
	groupBox1.setText("setting");

	button3.setLocation(new Point(40, 32));
	button3.setSize(new Point(168, 24));
	button3.setTabIndex(1);
	button3.setText("About the &Topic");
	button3.addOnClick(new EventHandler(this.button3_click));

	groupBox2.setLocation(new Point(592, 144));
	groupBox2.setSize(new Point(240, 144));
	groupBox2.setTabIndex(1);
	groupBox2.setTabStop(false);
	groupBox2.setText("transfer function");

	label1.setLocation(new Point(16, 24));
	label1.setSize(new Point(88, 16));
	label1.setTabIndex(0);
	label1.setTabStop(false);
	label1.setText("H(S)=R(S)/E(S)");

	label2.setLocation(new Point(40, 80));
	label2.setSize(new Point(192, 16));
	label2.setTabIndex(1);
	label2.setTabStop(false);
	label2.setText("=-----------------------------------------");

	edit1.setLocation(new Point(48, 40));
	edit1.setSize(new Point(184, 40));
	edit1.setTabIndex(3);
	edit1.setText("");
	edit1.setMultiline(true);
	edit1.setReadOnly(true);
	edit1.setScrollBars(ScrollBars.HORIZONTAL);

	edit2.setLocation(new Point(48, 88));
	edit2.setSize(new Point(184, 40));
	edit2.setTabIndex(2);
	edit2.setText("");
	edit2.setMultiline(true);
	edit2.setReadOnly(true);
	edit2.setScrollBars(ScrollBars.HORIZONTAL);

	groupBox4.setLocation(new Point(8, 8));
	groupBox4.setSize(new Point(576, 440));
	groupBox4.setTabIndex(3);
	groupBox4.setTabStop(false);
	groupBox4.setText("figure of gain response");

	panel.setBackColor(Color.CONTROLTEXT);
	panel.setLocation(new Point(8, 16));
	panel.setSize(new Point(560, 408));
	panel.setTabIndex(0);
	panel.setText("panel1");
	panel.addOnMouseMove(new MouseEventHandler(this.panel_mouseMove));
	panel.addOnPaint(new PaintEventHandler(this.panel_paint));

	toolTip1.setAutoPopDelay(5000);
	toolTip1.setInitialDelay(500);
	toolTip1.setReshowDelay(0);
	toolTip1.setShowAlways(true);
	toolTip1.setActivate(true);
	toolTip1.setToolTip(panel, "hhh");
	/* @designTimeOnly toolTip1.setLocation(new Point(112, 256)); */

	this.setNewControls(new Control[] {
						groupBox4, 
						groupBox3, 
						groupBox2, 
						groupBox1});
	groupBox3.setNewControls(new Control[] {
							 button4, 
							 button3});
	groupBox1.setNewControls(new Control[] {
							 button1});
	groupBox2.setNewControls(new Control[] {
							 edit2, 
							 edit1, 
							 label2, 
							 label1});
	groupBox4.setNewControls(new Control[] {
							 panel});
}
public static void main(String args[])
	{
		Application.run(new Form1());
	}

}