public void DrawLine(int x1, int y1, int x2, int y2, Argb32 color)
{
if (y1 == y2)
{
this.DrawHorizontalLine(x1, y1, x2, color);
return;
}
if (x1 == x2)
{
this.DrawVerticalLine(x1, y1, y2, color);
return;
}
int dx = Math.Abs(x2 - x1), sx = x1 < x2 ? 1 : -1;
int dy = Math.Abs(y2 - y1), sy = y1 < y2 ? 1 : -1;
int err = (dx > dy ? dx : -dy) / 2, e2;
while (true)
{
this.SetPixel(x1, y1, color);
if (x1 == x2 && y1 == y2)
{
break;
}
e2 = err;
if (e2 > -dx)
{
err -= dy; x1 += sx;
}
if (e2 < dy)
{
err += dx; y1 += sy;
}
}
}
public void AlphaBlend(Argb32 foreGround, double opacity)
{
if (foreGround.A == 255 && opacity == 1)
{
this.A = foreGround.A;
this.R = foreGround.R;
this.G = foreGround.G;
this.B = foreGround.B;
this.Color = foreGround.Color;
return;
}
if (foreGround.A == 0)
{
return;
}
var colora = this.color;
var colorb = foreGround.color;
uint a2 = foreGround.A; //(colorb & 0xFF000000) >> 24;
// prendre en compte l'opacité globale
a2 = (uint)((double)a2 * opacity);
uint a1 = (colora & 0xFF000000) >> 24;
uint nalpha = 0x100 - a2;
uint rb1 = (nalpha * (colora & 0xFF00FF)) >> 8;
uint rb2 = (a2 * (colorb & 0xFF00FF)) >> 8;
uint g1 = (nalpha * (colora & 0x00FF00)) >> 8;
uint g2 = (a2 * (colorb & 0x00FF00)) >> 8;
uint anew = a1 + a2;
if (anew > 255)
{
anew = 255;
}
this.SetColor(((rb1 + rb2) & 0xFF00FF) + ((g1 + g2) & 0x00FF00) + (anew << 24));
//if (foreGround.A == 0)
// return;
//if (this.A == 0)
//{
// this.SetColor(foreGround);
// return;
//}
//foreGround.A = (byte)((double)foreGround.A * opacity);
//if (foreGround.A == 255)
//{
// this.SetColor(foreGround);
// return;
//}
//int Alpha = ((int)foreGround.A) + 1;
//int B = Alpha * foreGround.B + (255 - Alpha) * this.B >> 8;
//int G = Alpha * foreGround.G + (255 - Alpha) * this.G >> 8;
//int R = Alpha * foreGround.R + (255 - Alpha) * this.R >> 8;
//int A = foreGround.A;
//if (this.A == 255)
// A = 255;
//if (A > 255)
// A = 255;
//if (R > 255)
// R = 255;
//if (G > 255)
// G = 255;
//if (B > 255)
// B = 255;
//this.SetColor((byte)Math.Abs(A), (byte)Math.Abs(R), (byte)Math.Abs(G), (byte)Math.Abs(B));
}
public void SetColor(Argb32 color)
{
SetColor(color.a, color.r, color.g, color.b);
}
