private void button4_Click(object sender, EventArgs e)
{
if (this.uC_Parabola1.IsValid())
{
var a = this.uC_Parabola1.A;
var b = this.uC_Parabola1.B;
var c = this.uC_Parabola1.C;
//判断方程的参数，是否有效
ParabolicEquation parabolic = new ParabolicEquation()
{
A = a, B = b, C = c
};
if (!parabolic.IsValid())
{
MessageBox.Show("输入的方程参数无效");
return;
}
if (!this.axisControl1.CheckParabolicIsValid(parabolic))
{
MessageBox.Show("输入的方程不在坐标轴内");
return;
}
bool flag = this.axisControl1.GenerateParabolic(parabolic);
if (!flag)
{
MessageBox.Show("生成抛物线失败");
return;
}
}
}
private async void button7_Click(object sender, EventArgs e)
{
if (this.uC_Parabola1.IsValid())
{
var a = this.uC_Parabola1.A;
var b = this.uC_Parabola1.B;
var c = this.uC_Parabola1.C;
//判断方程的参数，是否有效
ParabolicEquation parabolic = new ParabolicEquation()
{
A = a, B = b, C = c
};
if (!parabolic.IsValid())
{
MessageBox.Show("输入的方程参数无效");
return;
}
if (!this.axisControl1.CheckParabolicIsValid(parabolic))
{
MessageBox.Show("输入的方程不在坐标轴内");
return;
}
List <PointF> lstPoints = this.axisControl1.GetPointFromEquation(parabolic);
foreach (var ele in lstPoints)
{
axisControl1.GeneratePoint(ele);
await Task.Delay(500);
}
}
}
/// <summary>
/// 检查抛物线方程是否有效
/// </summary>
/// <param name="parabolic"></param>
/// <returns></returns>
public bool CheckParabolicIsValid(ParabolicEquation parabolic)
{
List <PointF> lstPoint = GetPointFromEquation(parabolic);
if (lstPoint.Count > 2)
{
return(true);
}
else
{
return(false);
}
}
public bool GenerateParabolic(ParabolicEquation parabolic)
{
List <PointF> lstPoint = GetPointFromEquation(parabolic);
//将刻度点，转换成像素点
List <PointF> lstPixlsPoint = ConvertScaleToPixls(lstPoint);
Color lineColor = Color.SeaGreen;//线条的颜色
Graphics g = this.CreateGraphics();
g.DrawCurve(new Pen(lineColor, lineWidth), lstPixlsPoint.ToArray());
g.DrawString(string.Format("P{0}", index), t_Font, Brushes.Black, new PointF(lstPixlsPoint[1].X + 2, lstPixlsPoint[1].Y - 2));
this.label1.Text += string.Format("P{0}:y={1}x2+{2}x+{3} ; ", index, parabolic.A, parabolic.B, parabolic.C);
index++;
return(true);
}
/// <summary>
/// 从抛物线方程中取点值
/// </summary>
/// <param name="parabolic"></param>
/// <returns></returns>
public List <PointF> GetPointFromEquation(ParabolicEquation parabolic)
{
List <PointF> lstPoint = new List <PointF>();
//从坐标轴最小值开始，隔0.5 取一个
int j = 0;
for (float i = 0 - this._AxisX.Max; i <= this._AxisX.Max; i = i + 0.5f)
{
PointF p = new PointF(i, parabolic.GetValueFromX(i));
//再判断点是否在坐标轴内
if (CheckPointIsValid(p) && (j == 0 || lstPoint[j - 1].X == i - 0.5f))
{
lstPoint.Add(p);//抛物线内的点应该是连续的
j++;
}
}
return(lstPoint);
}
