private void DrawLineH(RPen rpen, int y1, int x1, int x2)
{
if (x1 > x2)
{
int t = x1; x1 = x2; x2 = t;
}
PenAdapter pen = rpen.ToPenA();
pen.color.SetToSDLRenderer();
int width = (int)pen.width;
int w0, w1;
w0 = w1 = width / 2;
//w1 -= (width != 1 && width % 2 == 1) ? 1 : 0;
List <SDL.SDL_Rect> rects = new List <SDL.SDL_Rect>();
int length = (int)(x2 - x1) + 1;
switch (pen.dashStyle)
{
case RDashStyle.Solid:
rects.Add(new SDL.SDL_Rect {
x = x1, y = y1 - w0, w = length, h = width
});
break;
case RDashStyle.Dot:
for (int x = (int)x1; x <= x2 - width + 1; x += width * 2)
{
rects.Add(new SDL.SDL_Rect {
x = x, y = y1 - w0, w = width, h = width
});
}
if (length % (width * 2) < width)
{
rects.Add(new SDL.SDL_Rect {
x = x2 - length % (width * 2) + 1, y = y1 - w0, w = length % width, h = width
});
}
break;
case RDashStyle.Dash:
for (int x = (int)x1; x <= x2 - width * 2 + 1; x += width * 3)
{
rects.Add(new SDL.SDL_Rect {
x = x, y = y1 - w0, w = width * 2, h = width
});
}
if (length % (width * 3) < width * 2)
{
rects.Add(new SDL.SDL_Rect {
x = x2 - length % (width * 3) + 1, y = y1 - w0, w = length % (width * 3) + 1, h = width
});
}
break;
}
SDL.SDL_RenderFillRects(_renderer, rects.ToArray(), rects.Count);
}
internal List <SDL.SDL_Point> GetArcSDLPoints(PenAdapter pen, PathItem corner)
{
List <SDL.SDL_Point> points = new List <SDL.SDL_Point>();
Double step = 90f / ((double)corner.arc_r * Math.PI / 2f);
//points.Add(new SDL.SDL_Point { x = corner.arc_cx, y = corner.arc_cy });
for (double angle = 0; angle <= 90; angle += step)
{
points.Add(GetArcSDLPointAtAngle(corner, angle));
switch (pen.dashStyle)
{
case RDashStyle.Solid:
break;
case RDashStyle.Dot:
angle += step * 1.5f;
break;
case RDashStyle.Dash:
angle += step;
points.Add(GetArcSDLPointAtAngle(corner, angle));
angle += step * 2f;
break;
}
}
return(points);
}
private void DrawLineV(RPen rpen, int x1, int y1, int y2)
{
if (y1 > y2)
{
int t = y1; y1 = y2; y2 = t;
}
PenAdapter pen = rpen.ToPenA();
pen.color.SetToSDLRenderer();
int width = (int)pen.width;
int w0, w1;
w0 = w1 = width / 2;
//w1 -= (width != 1 && width % 2 == 1) ? 1 : 0;
List <SDL.SDL_Rect> rects = new List <SDL.SDL_Rect>();
int length = (int)(y2 - y1);
switch (pen.dashStyle)
{
case RDashStyle.Solid:
rects.Add(new SDL.SDL_Rect {
x = x1 - w0, y = y1, w = width, h = length
});
break;
case RDashStyle.Dot:
for (int y = y1; y <= y2 - width + 1; y += width * 2)
{
rects.Add(new SDL.SDL_Rect {
x = x1 - w0, y = y, w = width, h = width
});
}
if (length % (width * 2) < width)
{
rects.Add(new SDL.SDL_Rect {
x = x1 - w0, y = y2 - length % (width * 2) + 1, w = width, h = length % width
});
}
break;
case RDashStyle.Dash:
for (int y = y1; y <= y2 - width * 2 + 1; y += width * 3)
{
rects.Add(new SDL.SDL_Rect {
x = x1 - w0, y = y, w = width, h = width * 2
});
}
if (length % (width * 3) < width * 2)
{
rects.Add(new SDL.SDL_Rect {
x = x1 - w0, y = y2 - length % (width * 3) + 1, w = width, h = length % (width * 3)
});
}
break;
}
SDL.SDL_RenderFillRects(_renderer, rects.ToArray(), rects.Count);
}
