protected void rotateContext(Cairo.Context context, Direction direction)
{
switch (direction)
{
case Direction.Down:
context.Rotate(Math.PI);
context.Translate(-fieldSize, -fieldSize);
break;
case Direction.Right:
context.Rotate(Math.PI / 2);
context.Translate(0, -fieldSize);
break;
case Direction.Left:
context.Rotate(3 * Math.PI / 2);
context.Translate(-fieldSize, 0);
break;
}
}
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();
}
public static void DrawText(Cairo.Context context, float x, float y, double angle, string text)
{
var ext = context.TextExtents(text);
context.Save();
context.Translate(x, y);
context.Rotate(angle - Math.PI / 2);
context.Translate(-ext.Width / 2, 0);
context.ShowText(text);
context.Stroke();
context.Restore();
}
void DrawQuota(Cairo.Context context, double angle, Color color)
{
context.Save();
context.Rotate(angle * Math.PI / 180.0);
context.MoveTo(0, -95);
context.LineTo(1, -110);
context.LineTo(-1, -110);
context.ClosePath();
var c = color.ToCairo();
context.SetSourceRGBA(c.R, c.G, c.B, c.A);
context.Stroke();
context.Restore();
}
public void DrawAxisTitle(Cairo.Context cr, string text, int x, int y,
Orientation orientation)
{
cr.Save();
if (orientation == Orientation.Vertical)
{
cr.Translate(x, y);
cr.Rotate(Math.PI / 2);
cr.SetFontSize(AXIS_TITLE_FONT_SIZE);
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.Color = CairoHelper.GetCairoColor (gtk_style.Foreground (state));
cr.ShowText(text);
}
else
{
DrawText(cr, AXIS_TITLE_FONT_SIZE, text, x, y);
}
cr.Restore();
}
private void DrawStringTBLR(PageText pt, Cairo.Context g, Cairo.Rectangle r)
{
StyleInfo si = pt.SI;
string s = pt.Text;
g.Save();
layout = CairoHelper.CreateLayout(g);
//Pango fonts are scaled to 72dpi, Windows fonts uses 96dpi
float fontsize = (si.FontSize * 72 / 96);
var font = FontDescription.FromString($"{si.GetFontFamily().Name} {fontsize * PixelsX(1)}");
if (si.FontStyle == FontStyleEnum.Italic)
{
font.Style = Style.Italic;
}
switch (si.FontWeight)
{
case FontWeightEnum.Bold:
case FontWeightEnum.Bolder:
case FontWeightEnum.W500:
case FontWeightEnum.W600:
case FontWeightEnum.W700:
case FontWeightEnum.W800:
case FontWeightEnum.W900:
font.Weight = Weight.Bold;
break;
}
FontDescription oldfont = layout.FontDescription;
layout.FontDescription = font;
switch (si.TextAlign)
{
case TextAlignEnum.Right:
layout.Alignment = Alignment.Right;
break;
case TextAlignEnum.Center:
layout.Alignment = Alignment.Center;
break;
case TextAlignEnum.Left:
default:
layout.Alignment = Alignment.Left;
break;
}
layout.Width = Units.FromPixels((int)(r.Height - si.PaddingTop - si.PaddingBottom - 2));
layout.Wrap = WrapMode.WordChar;
layout.SetText(s);
Rectangle logical;
Rectangle ink;
layout.GetExtents(out ink, out logical);
double height = logical.Height / Scale.PangoScale;
double y = 0;
double x = 0;
switch (si.VerticalAlign)
{
case VerticalAlignEnum.Top:
x = r.X + si.PaddingLeft;
break;
case VerticalAlignEnum.Middle:
x = r.X + (r.Width - height) / 2;
break;
case VerticalAlignEnum.Bottom:
x = r.X + (r.Width - height) + si.PaddingLeft;
break;
}
// draw the background
DrawBackground(g, r, si);
Cairo.Rectangle box = new Cairo.Rectangle(
x,
r.Y + r.Height - si.PaddingBottom - 1,
r.Height - si.PaddingBottom - si.PaddingTop,
r.Width - si.PaddingLeft + si.PaddingRight);
g.Color = si.Color.ToCairoColor();
g.Rotate(270 * Math.PI / 180.0);
CairoHelper.UpdateLayout(g, layout);
g.MoveTo(-box.Y, box.X);
CairoHelper.ShowLayout(g, layout);
layout.FontDescription = oldfont;
g.Restore();
}
private void DrawArcSegment(double xm1, double ym1, double xm2, double ym2, double xr, double yr, double alpha, bool isLargeArc, SweepDirection direction)
{
if (xr <= 0.000000001 || yr <= 0.000000001)
{
return;
}
var x1 = xm1 * Math.Cos(-alpha) - ym1 * Math.Sin(-alpha);
var y1 = xm1 * Math.Sin(-alpha) + ym1 * Math.Cos(-alpha);
var x2 = xm2 * Math.Cos(-alpha) - ym2 * Math.Sin(-alpha);
var y2 = xm2 * Math.Sin(-alpha) + ym2 * Math.Cos(-alpha);
var r = 0.0;
if (xr > yr)
{
y1 = y1 * xr / yr;
y2 = y2 * xr / yr;
r = xr;
}
else
{
x1 = x1 * yr / xr;
x2 = x2 * yr / xr;
r = yr;
}
if (4 * r * r < (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2))
{
return;
}
var xc1 = 0.0;
var xc2 = 0.0;
var yc1 = 0.0;
var yc2 = 0.0;
if (Math.Abs(y1 - y2) > 0.000000001)
{
var A = (x1 - x2) / (y2 - y1);
var B = (x2 * x2 - x1 * x1 + y2 * y2 - y1 * y1) / (2 * (y2 - y1));
var a = A * A + 1;
var b = -2 * x1 + 2 * A * B - 2 * A * y1;
var c = x1 * x1 + B * B - 2 * B * y1 + y1 * y1 - r * r;
xc1 = (-b + Math.Sqrt(b * b - 4 * a * c)) / (2 * a);
yc1 = A * xc1 + B;
xc2 = (-b - Math.Sqrt(b * b - 4 * a * c)) / (2 * a);
yc2 = A * xc2 + B;
}
else
{
xc1 = (x1 + x2) / 2;
yc1 = y1 + Math.Sqrt(r * r - (xc1 - x1) * (xc1 - x1));
xc2 = (x1 + x2) / 2;
yc2 = y1 - Math.Sqrt(r * r - (xc2 - x1) * (xc2 - x1));
}
var angle1 = Math.Abs(y1 - yc1) / r > 1 ? Math.PI / 2 : Math.Asin(Math.Abs(y1 - yc1) / r);
if ((x1 < xc1) && (y1 >= yc1))
{
angle1 = Math.PI - angle1;
}
if (y1 < yc1)
{
if (x1 < xc1)
{
angle1 = Math.PI + angle1;
}
else
{
angle1 = -angle1;
}
}
var angle2 = Math.Abs(y2 - yc1) / r > 1 ? Math.PI / 2 : Math.Asin(Math.Abs(y2 - yc1) / r);
if ((x2 < xc1) && (y2 >= yc1))
{
angle2 = Math.PI - angle2;
}
if (y2 < yc1)
{
if (x2 < xc1)
{
angle2 = Math.PI + angle2;
}
else
{
angle2 = -angle2;
}
}
var alfa1 = Math.Abs(y1 - yc2) / r > 1 ? Math.PI / 2 : Math.Asin(Math.Abs(y1 - yc2) / r);
if ((x1 < xc2) && (y1 >= yc2))
{
alfa1 = Math.PI - alfa1;
}
if (y1 < yc2)
{
if (x1 < xc2)
{
alfa1 = Math.PI + alfa1;
}
else
{
alfa1 = -alfa1;
}
}
var alfa2 = Math.Abs(y2 - yc2) / r > 1 ? Math.PI / 2 : Math.Asin(Math.Abs(y2 - yc2) / r);
if ((x2 < xc2) && (y2 >= yc2))
{
alfa2 = Math.PI - alfa2;
}
if (y2 < yc2)
{
if (x2 < xc2)
{
alfa2 = Math.PI + alfa2;
}
else
{
alfa2 = -alfa2;
}
}
cr.Save();
cr.Rotate(alpha);
if (xr > yr)
{
cr.Scale(1, yr / xr);
}
else
{
cr.Scale(xr / yr, 1);
}
if (direction == SweepDirection.Clockwise)
{
if (isLargeArc)
{
if ((y1 < y2) || ((Math.Abs(y1 - y2) < 0.00000001) && (x1 > x2)))
{
cr.Arc(xc1, yc1, r, angle1, angle2);
}
else
{
cr.Arc(xc2, yc2, r, alfa1, alfa2);
}
}
else
{
if ((y1 > y2) || ((Math.Abs(y1 - y2) < 0.00000001) && (x1 < x2)))
{
cr.Arc(xc1, yc1, r, angle1, angle2);
}
else
{
cr.Arc(xc2, yc2, r, alfa1, alfa2);
}
}
}
else
{
if (isLargeArc)
{
if ((y1 > y2) || ((Math.Abs(y1 - y2) < 0.00000001) && (x1 < x2)))
{
cr.ArcNegative(xc1, yc1, r, angle1, angle2);
}
else
{
cr.ArcNegative(xc2, yc2, r, alfa1, alfa2);
}
}
else
{
if ((y1 < y2) || ((Math.Abs(y1 - y2) < 0.00000001) && (x1 > x2)))
{
cr.ArcNegative(xc1, yc1, r, angle1, angle2);
}
else
{
cr.ArcNegative(xc2, yc2, r, alfa1, alfa2);
}
}
}
cr.Restore();
}
