I have my own class that extends of PictureBox. I have a problem when I draw a circle arround it. The problem was on the "base.OnPaint(e)" and it throws an ArgumentException. I put the code below and then the complete class.
The method that throws the exception:
private void Parent_Paint(object sender, PaintEventArgs e)
{
if (clickPerformed)
{
using (Graphics g = e.Graphics)
{
using (Pen pen = new Pen(Color.Black, 2))
{
float locationX = this.Location.X + this.Size.Width / 2;
float locationY = this.Location.Y + this.Size.Height / 2;
float radius = (this.Size.Height + this.Size.Width) / 2;
float[] dashValues = { 5, 2, 15, 4 };
pen.DashPattern = dashValues;
DrawCircle(g, pen, locationX, locationY, radius); // draw circle
clickPerformed = false; // process done so set it to false
}
}
}
base.OnPaint(e);
}
The Unidad.cs class:
public class Unidad : PictureBox
{
//Constructor
public Unidad(string nombre, string tipo, int movimiento, int ha, int hp, int fuerza, int resistencia, int heridas, int iniciativa, int ataques, int liderazgo, int coste, string rutaImagen)
{
tipoUnidad = tipo;
movimientoUnidad = movimiento;
nombreUnidad = nombre;
costeUnidad = coste;
haUnidad = ha;
hpUnidad = hp;
fuerzaUnidad = fuerza;
resistenciaUnidad = resistencia;
iniciativaUnidad = iniciativa;
ataquesUnidad = ataques;
liderazgoUnidad = liderazgo;
rutaImagenUnidad = rutaImagen;
}
//Propiedades
public string nombreUnidad { get; set; }
public string tipoUnidad { get; set; }
public int movimientoUnidad { get; set; }
public int costeUnidad { get; set; }
public int haUnidad { get; set; }
public int hpUnidad { get; set; }
public int fuerzaUnidad { get; set; }
public int resistenciaUnidad { get; set; }
public int heridasUnidad { get; set; }
public int iniciativaUnidad { get; set; }
public int ataquesUnidad { get; set; }
public int liderazgoUnidad { get; set; }
public string rutaImagenUnidad { get; set; }
//Método para dibujar unidad
public void Colocar(Control control, Unidad unidad, Point p)
{
unidad.Location = p;
control.Controls.Add(unidad);
}
protected override void OnPaint(PaintEventArgs pe)
{
if (this.Parent != null)
{
this.Parent.Paint += Parent_Paint; // picturebox's paint means it added to parent so we need to trigger parent's paint event
}
base.OnPaint(pe);
}
bool clickPerformed = false; // to catch control has mouse down
private Point MouseDownLocation;
protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown(e);
clickPerformed = true; // set mouse down
Control tempSender = this.Parent; // get sender
tempSender.Invalidate(); // invalidate to trigger paint event
MouseDownLocation = e.Location;
}
private void Parent_Paint(object sender, PaintEventArgs e)
{
if (clickPerformed)
{
using (Graphics g = e.Graphics)
{
using (Pen pen = new Pen(Color.Black, 2))
{
float locationX = this.Location.X + this.Size.Width / 2;
float locationY = this.Location.Y + this.Size.Height / 2;
float radius = (this.Size.Height + this.Size.Width) / 2;
float[] dashValues = { 5, 2, 15, 4 };
pen.DashPattern = dashValues;
DrawCircle(g, pen, locationX, locationY, radius); // draw circle
clickPerformed = false; // process done so set it to false
}
}
}
base.OnPaint(e);
}
protected override void OnMouseUp(MouseEventArgs e)
{
this.Parent.Invalidate(); // mouse up circle should be erased, so invalidate again to trigger paint, but this time clickPerformed is false
// so it won't draw circle again
base.OnMouseDown(e);
}
public void DrawCircle(Graphics g, Pen pen, float centerX, float centerY, float radius)
{
g.DrawEllipse(pen, centerX - radius, centerY - radius, radius + radius, radius + radius);
}
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
if (clickPerformed)
{
Left = e.X + Left - MouseDownLocation.X;
Top = e.Y + Top - MouseDownLocation.Y;
}
}
//Método para dibujar la zona límite de movimiento de la unidad
public void DibujarLimites()
{
using (Graphics g = CreateGraphics())
{
using (Pen pen = new Pen(Color.Red, 2))
{
float[] dashValues = { 5, 2, 15, 4 };
pen.DashPattern = dashValues;
DrawCircle(g, pen, 0, 0, 20);
}
}
}
}
When I remove the "base.OnPaint(e)" line, it gives me an "System.ArgumentException' in System.Drawing.dll" at Program.cs, on line:"Application.Run(new Form1());"
Can anyone help me? Thanks!
