private void put4pitxel(int x, int y, Graphics g)
{
ToaDo.putpixel(new Point(tam.X + x, tam.Y + y), g, this.mau);
ToaDo.putpixel(new Point(tam.X - x, tam.Y + y), g, this.mau);
ToaDo.putpixel(new Point(tam.X - x, tam.Y - y), g, this.mau);
ToaDo.putpixel(new Point(tam.X + x, tam.Y - y), g, this.mau);
}
public int netdut(Point p, Graphics g, Color c, int length)
{
if (length % 7 >= 0 && length % 7 < 5)
{
ToaDo.putpixel(p, g, this.mau);
}
length++;
return(length);
}
public void Drawn8Point(int x, int y, Graphics g, Color color)
{
ToaDo.putpixel(new Point(x + tam.X, y + tam.Y), g, color);
ToaDo.putpixel(new Point(y + tam.X, x + tam.Y), g, color);
ToaDo.putpixel(new Point(-x + tam.X, -y + tam.Y), g, color);
ToaDo.putpixel(new Point(-y + tam.X, -x + tam.Y), g, color);
ToaDo.putpixel(new Point(-x + tam.X, y + tam.Y), g, color);
ToaDo.putpixel(new Point(-y + tam.X, x + tam.Y), g, color);
ToaDo.putpixel(new Point(x + tam.X, -y + tam.Y), g, color);
ToaDo.putpixel(new Point(y + tam.X, -x + tam.Y), g, color);
}
public void vedthang(Graphics g)
{
//Này xài thuật toán Breshenhem nha
int x, y;
float p;
float c2 = 0;
float c = 0;
int x1 = this.diemdau.X;
int y1 = this.diemdau.Y;
int x2 = this.diemcuoi.X;
int y2 = this.diemcuoi.Y;
float Dx = Math.Abs(x2 - x1);
float Dy = Math.Abs(y2 - y1);
c = Dx - Dy;
c2 = 2 * c;
x = x1;
p = 2 * Dy - Dx;
y = y1;
int x_unit = 5, y_unit = 5;
if (x2 - x1 < 0)
{
x_unit = -x_unit;
}
if (y2 - y1 < 0)
{
y_unit = -y_unit;
}
ToaDo.putpixel(new Point(x, y), g, this.mau);
if (x1 == x2) // duong thang dung
{
while (y != y2)
{
y += y_unit;
ToaDo.putpixel(new Point(x, y), g, this.mau);
}
}
else if (y1 == y2) // duong ngang
{
while (x != x2)
{
x += x_unit;
ToaDo.putpixel(new Point(x, y), g, this.mau);
}
}
else if (x1 != x2 && y1 != y2) // duong xien
{
if ((Math.Abs(y2 - y1)) <= 25)
{
while (x != x2)
{
if (p < 0)
{
p += 2 * Dy;
}
else
{
p += 2 * (Dy - Dx);
y += y_unit;
}
x += x_unit;
ToaDo.putpixel(new Point(x, y), g, this.mau);
}
}
else
{
if (x2 >= x1)
{
// var sign=5;
// (y2>y1)? sign=5:sign=-5;
while (!(x == x2 + 5 || y == y2))
{
c2 = 2 * c;
if (c2 > -Dy)
{
c = c - Dy;
x = x + x_unit;
}
if (c2 < Dx)
{
c = c + Dx;
y = y + y_unit;
}
ToaDo.putpixel(new Point(x, y), g, this.mau);
}
}
if (x2 < x1)
{
// var sign=5;
// (y2>y1)? sign=+5:sign=-5;
while (!(x == x2 - 5 || y == y2))
{
c2 = 2 * c;
if (c2 > -Dy)
{
c = c - Dy;
x = x + x_unit;
}
if (c2 < Dx)
{
c = c + Dx;
y = y + y_unit;
}
ToaDo.putpixel(new Point(x, y), g, this.mau);
}
}
}
}
}
public void veelip(Graphics g)
{
//code ve elip
//Elip su dung thuat toan midpoint
int x, y, cx, cy;
cx = tam.X; cy = tam.Y;
x = 0; y = this.b;
int A, B;
A = a * a;
B = b * b;
double p = B + A / 4 - A * b;
x = 0;
y = b;
int Dx = 0;
int Dy = 2 * A * y;
put4pitxel(x, y, g);
while (Dx < Dy)
{
x++;
Dx += 2 * B;
if (p < 0)
{
p += B + Dx;
}
else
{
y--;
Dy -= 2 * A;
p += B + Dx - Dy;
}
if (x % 5 == 0)
{
put4pitxel(x, ToaDo.round(y), g);
}
}
p = Math.Round(B * (x + 0.5f) * (x + 0.5f) + A * (y - 1) * (y - 1) - A * B);
while (y > 0)
{
y--;
Dy -= A * 2;
if (p > 0)
{
p += A - Dy;
}
else
{
x++;
Dx += B * 2;
p += A - Dy + Dx;
}
if (x % 5 == 0)
{
put4pitxel(x, ToaDo.round(y), g);
}
}
}
public void venetdut_elip(Graphics g)
{
int x, y, cx, cy, a, b;
cx = this.tam.X;
cy = this.tam.Y;
a = this.a;
b = this.b;
x = 0;
y = b;
int A, B;
A = a * a;
B = b * b;
double p = B + A / 4 - A * b;
x = 0;
y = b;
int Dx = 0;
int Dy = 2 * A * y;
put4pitxel_3D(x, y, g);
while (Dx <= Dy)
{
x += 1;
Dx += 2 * B;
if (p < 0)
{
p += B + Dx;
}
else
{
y -= 1;
Dy -= 2 * A;
p += B + Dx - Dy;
}
if (x % 5 == 0)
{
put4pitxel_3D(x, ToaDo.round(y), g);
}
}
p = Math.Round(B * (x + 0.5f) * (x + 0.5f) + A * (y - 1) * (y - 1) - A * B);
while (y >= 0)
{
y -= 1;
Dy -= A * 2;
if (p > 0)
{
p += A - Dy;
}
else
{
x += 1;
Dx += B * 2;
p += A - Dy + Dx;
}
if (x % 5 == 0)
{
put4pitxel_3D(x, ToaDo.round(y), g);
}
}
}