private void Draw()
{
//hàm vẽ giá trị
try
{
Graphics graph = PictureBox_DoThi.CreateGraphics();
Point toaDo = new Point();
Point ptAnt = new Point(0, 100);
graph.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
for (int ContItems = 0; ContItems <= Display_X_Y.Items.Count - 1; ContItems++)
{
string str = Display_X_Y.Items[ContItems].ToString();
for (int ContChar = 0; ContChar < str.Length; ContChar++)
{
if (Display_X_Y.Items[ContItems].ToString().Substring(ContChar, 1) == " ")
{
toaDo.X = Convert.ToInt32(str.Remove(ContChar, str.Length - ContChar));
toaDo.Y = 100 - Convert.ToInt32(str.Remove(0, ContChar));
ContChar = str.Length;
}
}
graph.DrawLine(new Pen(Color.Blue, 2), ptAnt.X + 310, ptAnt.Y + 160, toaDo.X + 310, toaDo.Y + 160); //vẽ đường nối
graph.FillEllipse(new SolidBrush(Color.Red), toaDo.X + 310, toaDo.Y + 153, 6, 6); //vẽ chấm đỏ
graph.DrawLine(new Pen(Color.Black, 1), 0, 260, 620, 260); //vẽ trục X
graph.DrawLine(new Pen(Color.Black, 1), 310, 1, 310, 520); //vẽ trục Y
graph.DrawString("O",
new Font("Palatino Linotype", 10, FontStyle.Bold),
new SolidBrush(Color.Black), 310, 260);//ghi tâm O
graph.DrawString("Y",
new Font("Palatino Linotype", 10, FontStyle.Bold),
new SolidBrush(Color.Black), 310, 1); // ghi trục y
graph.DrawString("X",
new Font("Palatino Linotype", 10, FontStyle.Bold),
new SolidBrush(Color.Black), 600, 260); // ghi trục x
ptAnt = toaDo;
}
}
catch (Exception ex2)
{
MessageBox.Show(ex2.Message, "LỖI VẼ HÌNH");
}
}
private void button_Clear_Click(object sender, EventArgs e)
{
try
{
File.WriteAllText(@"savedata.txt", String.Empty);
}
catch (Exception ex4)
{
{
MessageBox.Show(ex4.Message, "LỖI XÓA FILE");
}
}
// xóa đồ thị và list box
PictureBox_DoThi.Refresh();
Display_X_Y.Refresh();
Display_X_Y.ResetText();
Display_X_Y.Items.Clear();
}
