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); }