I am trying to do a Panel in c# using .net framework. I have a panel where I draw some lines and thots. And I want to control de bezier curves with it. And I came out with this: ``
namespace Bezier { public partial class FormMain : Form { Pen lapisLinhas = new Pen(Color.White, 3); Pen lapisPontos = new Pen(Color.Black, 2); Pen lapisControlos = new Pen(Color.Red, 3); Random rnd;
private int frame = 40;
private int sele = 0, ct = 0;
private Point p1, p2, p3, p4, p5, p6, p7, p8, p9, p10;
public FormMain()
{
InitializeComponent();
}
private void PanelDraw_Paint(object sender, PaintEventArgs e)
{
desenhaBezier(e.Graphics);
}
/* protected virtual void onl oad(EventArgs e)
{
gerarPontos();
}*/
private void FormMain_Load(object sender, EventArgs e)
{
gerarPontos();
}
private void desenhaBezier(Graphics g)
{
Point[] pontos = { p1, p2, p3, p4, p5, p6, p7, p8, p9, p10 };
g.Clear(PanelDraw.BackColor);
int w = PanelDraw.DisplayRectangle.Width;
int h = PanelDraw.DisplayRectangle.Height;
rnd = new Random();
g.DrawBeziers(lapisLinhas, pontos);
int r = 3;
for (int i = 0; i < pontos.Length; i )
{
g.DrawEllipse(lapisPontos, pontos[i].X - r, pontos[i].Y - r, r * 2, r * 2);
}
g.DrawLine(lapisControlos, p1, p2);
g.DrawLine(lapisControlos, p3, p4);
g.DrawLine(lapisControlos, p5, p6);
g.DrawLine(lapisControlos, p7, p8);
g.DrawLine(lapisControlos, p9, p10);
}
private void gerarPontos()
{
int w = PanelDraw.DisplayRectangle.Width;
int h = PanelDraw.DisplayRectangle.Height;
StatusLabelScreen.Text = "Screen: (w: " w "|h: " h ")";
rnd = new Random();
p1 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
p2 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
p3 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
p4 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
p5 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
p6 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
p7 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
p8 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
p9 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
p10 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
PanelDraw.Invalidate();
}
private void StatusLabelPosicao_Click(object sender, EventArgs e)
{
}
private void novosPontosToolStripMenuItem_Click(object sender, EventArgs e)
{
rnd = new Random();
int w = PanelDraw.DisplayRectangle.Width;
int h = PanelDraw.DisplayRectangle.Height;
StatusLabelScreen.Text = "Screen: (w: " w "| h: " h ")";
p1 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
p2 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
p3 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
p4 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
p5 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
p6 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
p7 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
p8 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
p9 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
p10 = new Point(rnd.Next(frame, w - frame), rnd.Next(frame, h - frame));
PanelDraw.Invalidate();
}
private void corDosPontosToolStripMenuItem_Click(object sender, EventArgs e)
{
if (colorDialog.ShowDialog() == DialogResult.OK)
{
Color pontosCor = colorDialog.Color;
lapisPontos.Color = pontosCor;
PanelDraw.Invalidate();
}
}
private void pontosToolStripMenuItem_Click(object sender, EventArgs e)
{
pontosToolStripMenuItem.Checked = !pontosToolStripMenuItem.Checked;
if (!pontosToolStripMenuItem.Checked)
{
Color trans = Color.Transparent;
lapisPontos = new Pen(trans);
}
else
{
lapisPontos = new Pen(Color.Red);
}
PanelDraw.Invalidate();
}
private void controlosToolStripMenuItem_Click(object sender, EventArgs e)
{
controlosToolStripMenuItem.Checked = !controlosToolStripMenuItem.Checked;
if (!controlosToolStripMenuItem.Checked)
{
Color trans = Color.Transparent;
lapisControlos = new Pen(trans);
}
else
{
lapisControlos = new Pen(Color.Black);
}
PanelDraw.Invalidate();
}
private void corDosControlosToolStripMenuItem_Click(object sender, EventArgs e)
{
if (colorDialog.ShowDialog() == DialogResult.OK)
{
Color controlosCor = colorDialog.Color;
lapisControlos.Color = controlosCor;
PanelDraw.Invalidate();
}
}
private void PanelDraw_MouseMove(object sender, MouseEventArgs e)
{
StatusLabelPosicao.Text = "Rato = (" e.X "|" e.Y ")";
if (sele == 1)
{
for (int i = 0; i < 10; i )
{
if (ct - 1 == i)
{
switch (i)
{
case 0:
p1.X = e.X;
p1.Y = e.Y;
break;
case 1:
p2.X = e.X;
p2.Y = e.Y;
break;
case 2:
p3.X = e.X;
p3.Y = e.Y;
break;
case 3:
p4.X = e.X;
p4.Y = e.Y;
break;
case 4:
p5.X = e.X;
p5.Y = e.Y;
break;
case 5:
p6.X = e.X;
p6.Y = e.Y;
break;
case 6:
p7.X = e.X;
p7.Y = e.Y;
break;
case 7:
p8.X = e.X;
p8.Y = e.Y;
break;
case 8:
p9.X = e.X;
p9.Y = e.Y;
break;
case 9:
p10.X = e.X;
p10.Y = e.Y;
break;
}
}
}
PanelDraw.Invalidate();
}
}
private void sairToolStripMenuItem_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void PanelDraw_Resize(object sender, EventArgs e)
{
int w = PanelDraw.DisplayRectangle.Width;
int h = PanelDraw.DisplayRectangle.Height;
StatusLabelScreen.Text = "Screen: (w: " w "| h: " h ")";
PanelDraw.Invalidate();
}
private void corDasLinhasToolStripMenuItem_Click(object sender, EventArgs e)
{
if (colorDialog.ShowDialog() == DialogResult.OK)
{
Color linhasCor = colorDialog.Color;
lapisLinhas.Color = linhasCor;
PanelDraw.Invalidate();
}
}
private void PanelDraw_click(object sender, MouseEventArgs e)
{
Point[] pontos = { p1, p2, p3, p4, p5, p6, p7, p8, p9, p10 };
if (sele == 1)
{
for (int i = 0; i < 10; i )
{
if (ct - 1 == i)
{
switch (i)
{
case 0:
p1.X = e.X;
p1.Y = e.Y;
break;
case 1:
p2.X = e.X;
p2.Y = e.Y;
break;
case 2:
p3.X = e.X;
p3.Y = e.Y;
break;
case 3:
p4.X = e.X;
p4.Y = e.Y;
break;
case 4:
p5.X = e.X;
p5.Y = e.Y;
break;
case 5:
p6.X = e.X;
p6.Y = e.Y;
break;
case 6:
p7.X = e.X;
p7.Y = e.Y;
break;
case 7:
p8.X = e.X;
p8.Y = e.Y;
break;
case 8:
p9.X = e.X;
p9.Y = e.Y;
break;
case 9:
p10.X = e.X;
p10.Y = e.Y;
break;
}
PanelDraw.Update();
sele = 0;
}
}
}
else
{
ct = 0;
foreach (Point point in pontos)
{
ct ;
if (e.X >= point.X - 3 && e.X <= point.X 3 && e.Y >= point.Y - 3 && e.Y <= point.Y 3)
{
sele = 1;
return;
}
}
}
PanelDraw.Invalidate();
}
}
} ``
Is there a way to make the lines draw faster? Everytime I move the mouse, they update, and I want that. But they are just blinking all the time. I have tried update() instead of validate, but the line update after click, so I can´t see it properly.
Is there a way to make it smooth transition?
CodePudding user response：
I have used this, found in other post, and it worked pretty fine:
typeof(Panel).InvokeMember("DoubleBuffered", BindingFlags.SetProperty
| BindingFlags.Instance | BindingFlags.NonPublic, null,
YourPanelName, new object[] { true });