static void DrawLineEndAtIter(Cairo.Context cntx, TextView view, TextIter iter)
{
Gdk.Rectangle rect = view.GetIterLocation(iter);
int x, y;
view.BufferToWindowCoords(TextWindowType.Text,
rect.X,
rect.Y + rect.Height / 2,
out x, out y);
cntx.Save();
cntx.Color = GetDrawingColorForIter(view, iter);
double arrowSize = 3;
cntx.MoveTo(x + 10, y);
cntx.RelLineTo(new Cairo.Distance(0, -arrowSize));
cntx.RelMoveTo(new Cairo.Distance(0, arrowSize));
cntx.RelLineTo(new Cairo.Distance(-8, 0));
cntx.RelLineTo(new Cairo.Distance(arrowSize, arrowSize));
cntx.RelMoveTo(new Cairo.Distance(-arrowSize, -arrowSize));
cntx.RelLineTo(new Cairo.Distance(arrowSize, -arrowSize));
cntx.Stroke();
cntx.Restore();
}
public static void RenderCross(Cairo.Context context, Point scale, Point item, double msize, double lw)
{
context.MoveTo(item.X * scale.X, item.Y * scale.Y);
context.RelMoveTo(-msize / 2, -msize / 2);
context.RelLineTo(msize, msize);
context.Stroke();
context.MoveTo(item.X * scale.X, item.Y * scale.Y);
context.RelMoveTo(msize / 2, -msize / 2);
context.RelLineTo(-msize, msize);
context.Stroke();
}
public void DrawAxisBoundingBox(Cairo.Context cr, int x, int y,
int width, int height, AxisLocation loc)
{
cr.MoveTo(x, y);
if (loc == AxisLocation.Bottom)
{
cr.RelMoveTo(width, 0);
}
else
{
cr.RelLineTo(width, 0);
}
if (loc == AxisLocation.Left)
{
cr.RelMoveTo(0, height);
}
else
{
cr.RelLineTo(0, height);
}
if (loc == AxisLocation.Top)
{
cr.RelMoveTo(-width, 0);
}
else
{
cr.RelLineTo(-width, 0);
}
if (loc == AxisLocation.Right)
{
cr.RelMoveTo(0, -height);
}
else
{
cr.RelLineTo(0, -height);
}
//cr.Color = CairoHelper.GetCairoColor (gtk_style.Foreground (state));
cr.SetSourceRGBA(CairoHelper.GetCairoColor(gtk_style.Foreground(state)).R, CairoHelper.GetCairoColor(gtk_style.Foreground(state)).G, CairoHelper.GetCairoColor(gtk_style.Foreground(state)).B, CairoHelper.GetCairoColor(gtk_style.Foreground(state)).A);
cr.LineWidth = 2.0f;
cr.Stroke();
}
private static void MakeSquare(Cairo.Context context, Point scale, Point item, double msize, double lw)
{
double size = msize - lw;
context.MoveTo(item.X * scale.X, item.Y * scale.Y);
context.RelMoveTo(-size / 2, -size / 2);
context.RelLineTo(size, 0);
context.RelLineTo(0, size);
context.RelLineTo(-size, 0);
context.ClosePath();
}
public static void SaveToPng(List <LibTessDotNet.ContourVertex> path)
{
if (path == null || path.Count <= 1)
{
return;
}
using (Cairo.ImageSurface surface = new Cairo.ImageSurface(Cairo.Format.Argb32, (int)Form.current.Size.Width, (int)Form.current.Size.Height))
using (Cairo.Context g = new Cairo.Context(surface))
{
g.MoveTo(path[0].Position.X, path[0].Position.Y);
for (int i = 1; i < path.Count; i++)
{
var x0 = path[i - 1].Position.X;
var y0 = path[i - 1].Position.Y;
var x1 = path[i].Position.X;
var y1 = path[i].Position.Y;
g.LineTo(x1, y1);
{
// draw index number
g.RelMoveTo(5, 5);
g.ShowText(i.ToString());
g.MoveTo(x1, y1);
// draw arrow
var dx = x1 - x0;
var dy = y1 - y0;
if (MathEx.AmostZero(dx) && MathEx.AmostZero(dy))
{
continue;
}
var n0 = new Vector(-dy, dx); n0.Normalize();
var n1 = new Vector(dy, -dx); n1.Normalize();
var B = new Point(x1, y1);
var d = new Vector(x0 - x1, y0 - y1); d.Normalize();
var arrowEnd0 = B + 5 * (d + n0);
var arrowEnd1 = B + 5 * (d + n1);
g.MoveTo(x1, y1);
g.LineTo(new Cairo.PointD(arrowEnd0.X, arrowEnd0.Y));
g.MoveTo(x1, y1);
g.LineTo(new Cairo.PointD(arrowEnd1.X, arrowEnd1.Y));
g.MoveTo(x1, y1);
}
}
g.Stroke();
surface.WriteToPng(@"D:\contour_test.png");
}
}
private static void DrawArrow(Cairo.Context graphics, double x, double y, double pos)
{
graphics.MoveTo(x, y);
graphics.Rotate(pos);
graphics.RelMoveTo(0, (pos + 0.5 * System.Math.PI < System.Math.PI ? -1 : 1) * s_arrowSize / 2);
graphics.RelLineTo(-s_arrowSize, 0);
graphics.RelLineTo(s_arrowSize, -s_arrowSize);
graphics.RelLineTo(s_arrowSize, s_arrowSize);
graphics.RelLineTo(-s_arrowSize, 0);
graphics.Fill();
}
private static void MakeTriangle(Cairo.Context context, Point scale, Point item, double msize, double lw)
{
double halfsize = (msize - lw) / 2;
context.MoveTo(item.X * scale.X, item.Y * scale.Y);
context.RelMoveTo(0, halfsize);
double dx = halfsize * s_triangleDxDy.X;
double dy = halfsize * s_triangleDxDy.Y;
context.RelLineTo(dx, -halfsize - dy);
context.RelLineTo(2 * -dx, 0);
context.ClosePath();
}
public override void RelMoveTo(object backend, double dx, double dy)
{
Cairo.Context ctx = ((CairoContextBackend)backend).Context;
ctx.RelMoveTo(dx, dy);
}
public void RelMoveTo(object backend, double dx, double dy)
{
Cairo.Context ctx = ((GtkContext)backend).Context;
ctx.RelMoveTo(dx, dy);
}
