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我正在寫一個圖形繪製代碼來呈現圖中所示的數學表達式。我不明白如何在文本框中輸入表達式來應用於進一步的計算?舉個例子:我如何取代y = x * x/128;在我的代碼中輸入在文本框中的表達式?像y = textbox.text;C#如何使用UI文本框中的數學表達式進行計算?
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
e.Graphics.ScaleTransform(1.0f, -1.0f); //Invert coordinatesystem on screen
e.Graphics.TranslateTransform(420, -this.ClientRectangle.Height + 300); //PUT coordinate 0, 0 in the middle of screen
int min = 0;
int max = 250;
int x = 0;
int y = 0;
e.Graphics.DrawLine(Pens.LightSteelBlue, min-400, min, max+200, min); //X1,Y1,X2;Y2
e.Graphics.DrawLine(Pens.LightSteelBlue, min, min-250, min, max); //X1,Y1,X2;Y2
Brush aBrush = (Brush)Brushes.LightSteelBlue;
while (x <= max && y <= max)
{
y = x*x/128;
if (y > max)
break;
e.Graphics.FillRectangle(aBrush, x, y, 1, 1); //x,y,width,height
System.Threading.Thread.Sleep(10);
Application.DoEvents();
x++;
}
INPUT_FORMULA.Focus(); // textbox to enter formula
INPUT_FORMULA.Select(INPUT_FORMULA.Text.Length, 0);
}
我該怎麼做? –
我試過了:double.TryParse(INPUT_FORMULA.Text,out b); –
int p = Convert.ToInt32(a); int q = Convert.ToInt32(b); –