class graphCanvas extends Canvas{
	double xmin=0,xmax=30,ymin=0,ymax=300;
	int gxmin=20,gxmax=180,gymin=20,gymax=180;
	
	public void setGraphSize(double xmin0,double xmax0,double ymin0,double ymax0){
		xmin=xmin0;
		xmax=xmax0;
		ymin=ymin0;
		ymax=ymax0;
	}
	public void paint(Graphics g){
		drawGraphAxis(g);
	}
	public void drawGraphAxis(Graphics g){
		g.drawLine(40,20,40,280);
		g.drawLine(20,260,280,260);
		g.drawString("����",145,275);
		g.drawString("�w",25,140);
		g.drawString("��",25,155);
		g.drawString("�W",25,170);
		g.drawString("0",25,275);
	}
	public void clear(){
		Graphics g=getGraphics();
		g.clearRect(0,0,getSize().width,getSize().height);
		drawGraphAxis(g);
	}
	public void drawPoint(double x,double y){
		int gx,gy;
		gx=(int)(x+40);
		gy=(int)(260-y);
		Graphics g=getGraphics();
		g.drawLine(gx,gy,gx,gy);
	}
}