public static void ChuongTrinh_GiaiPhuongTrinhBacHai()
{
double a = HTConnsole.NhapSoThuc("a=");
double b = HTConnsole.NhapSoThuc("b=");
double c = HTConnsole.NhapSoThuc("c=");
if (a == 0)
{
Console.WriteLine("a khong the la 0");
return;
}
double[] nghiem = HTMath.PhuongTrinhBac2(a, b, c);
if (nghiem.Length == 2)
{
Console.WriteLine("Phuong trinh co 2 nghiem la x1 = {0}, x2 = {1}", nghiem[0], nghiem[1]);
}
else if (nghiem.Length == 1)
{
Console.WriteLine("Phuong trinh co 1 nghiem la x = {0}", nghiem[0]);
}
else if (nghiem.Length == 0)
{
Console.WriteLine("Phuong trinh vo nghiem");
}
}
public virtual bool DrawNeedle(Graphics Gr, RectangleF rc)
{
if (this.AnalogMeter == null)
{
return(false);
}
float w, h;
w = rc.Width;
h = rc.Height;
double minValue = this.AnalogMeter.MinValue;
double maxValue = this.AnalogMeter.MaxValue;
double currValue = this.AnalogMeter.Value;
float startAngle = this.AnalogMeter.GetStartAngle();
float endAngle = this.AnalogMeter.GetEndAngle();
float radius = (float)(w / 2 - (w * 0.12));
float val = (float)(maxValue - minValue);
val = (float)((100 * (currValue - minValue)) / val);
val = ((endAngle - startAngle) * val) / 100;
val += startAngle;
float angle = HTMath.GetRadian(val);
float cx = needleCenter.X;
float cy = needleCenter.Y;
PointF ptStart = new PointF(0, 0);
PointF ptEnd = new PointF(0, 0);
GraphicsPath pth1 = new GraphicsPath();
ptStart.X = cx;
ptStart.Y = cy;
angle = HTMath.GetRadian(val + 10);
ptEnd.X = (float)(cx + (w * .09F) * Math.Cos(angle));
ptEnd.Y = (float)(cy + (w * .09F) * Math.Sin(angle));
pth1.AddLine(ptStart, ptEnd);
ptStart = ptEnd;
angle = HTMath.GetRadian(val);
ptEnd.X = (float)(cx + radius * Math.Cos(angle));
ptEnd.Y = (float)(cy + radius * Math.Sin(angle));
pth1.AddLine(ptStart, ptEnd);
ptStart = ptEnd;
angle = HTMath.GetRadian(val - 10);
ptEnd.X = (float)(cx + (w * .09F) * Math.Cos(angle));
ptEnd.Y = (float)(cy + (w * .09F) * Math.Sin(angle));
pth1.AddLine(ptStart, ptEnd);
pth1.CloseFigure();
SolidBrush br = new SolidBrush(this.AnalogMeter.NeedleColor);
Pen pen = new Pen(this.AnalogMeter.NeedleColor);
Gr.DrawPath(pen, pth1);
Gr.FillPath(br, pth1);
return(true);
}
public virtual bool DrawDivisions(Graphics Gr, RectangleF rc)
{
if (this.AnalogMeter == null)
{
return(false);
}
float startAngle = this.AnalogMeter.GetStartAngle();
float endAngle = this.AnalogMeter.GetEndAngle();
float scaleDivisions = this.AnalogMeter.ScaleDivisions;
float scaleSubDivisions = this.AnalogMeter.ScaleSubDivisions;
double minValue = this.AnalogMeter.MinValue;
double maxValue = this.AnalogMeter.MaxValue;
Color scaleColor = this.AnalogMeter.ScaleColor;
float cx = needleCenter.X;
float cy = needleCenter.Y;
float w = rc.Width;
float h = rc.Height;
float incr = HTMath.GetRadian((endAngle - startAngle) / ((scaleDivisions - 1) * (scaleSubDivisions + 1)));
float currentAngle = HTMath.GetRadian(startAngle);
float radius = (float)(w / 2 - (w * 0.08));
float rulerValue = (float)minValue;
Pen pen = new Pen(scaleColor, (1 * drawRatio));
SolidBrush br = new SolidBrush(scaleColor);
PointF ptStart = new PointF(0, 0);
PointF ptEnd = new PointF(0, 0);
int n = 0;
for ( ; n < scaleDivisions; n++)
{
//Draw Thick Line
ptStart.X = (float)(cx + radius * Math.Cos(currentAngle));
ptStart.Y = (float)(cy + radius * Math.Sin(currentAngle));
ptEnd.X = (float)(cx + (radius - w / 20) * Math.Cos(currentAngle));
ptEnd.Y = (float)(cy + (radius - w / 20) * Math.Sin(currentAngle));
Gr.DrawLine(pen, ptStart, ptEnd);
//Draw Strings
Font font = new Font(this.AnalogMeter.Font.FontFamily, (float)(6F * drawRatio));
float tx = (float)(cx + (radius - (20 * drawRatio)) * Math.Cos(currentAngle));
float ty = (float)(cy + (radius - (20 * drawRatio)) * Math.Sin(currentAngle));
double val = Math.Round(rulerValue);
String str = String.Format("{0,0:D}", (int)val);
SizeF size = Gr.MeasureString(str, font);
Gr.DrawString(str,
font,
br,
tx - (float)(size.Width * 0.5),
ty - (float)(size.Height * 0.5));
rulerValue += (float)((maxValue - minValue) / (scaleDivisions - 1));
if (n == scaleDivisions - 1)
{
font.Dispose();
break;
}
if (scaleDivisions <= 0)
{
currentAngle += incr;
}
else
{
for (int j = 0; j <= scaleSubDivisions; j++)
{
currentAngle += incr;
ptStart.X = (float)(cx + radius * Math.Cos(currentAngle));
ptStart.Y = (float)(cy + radius * Math.Sin(currentAngle));
ptEnd.X = (float)(cx + (radius - w / 50) * Math.Cos(currentAngle));
ptEnd.Y = (float)(cy + (radius - w / 50) * Math.Sin(currentAngle));
Gr.DrawLine(pen, ptStart, ptEnd);
}
}
font.Dispose();
}
return(true);
}
