本文整理汇总了C#中Cairo.Context.ArcNegative方法的典型用法代码示例。如果您正苦于以下问题：C# Context.ArcNegative方法的具体用法？C# Context.ArcNegative怎么用？C# Context.ArcNegative使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Cairo.Context的用法示例。
在下文中一共展示了Context.ArcNegative方法的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: arc_negative
public void arc_negative(Context cr, int width, int height)
{
PointD c = new PointD(0.5, 0.5);
double radius = 0.4;
double angle1 = 45.0 * (Math.PI/180.0); /* angles are specified */
double angle2 = 180.0 * (Math.PI/180.0); /* in radians */
Normalize(cr, width, height);
cr.ArcNegative(c.X, c.Y, radius, angle1, angle2);
cr.Stroke();
// draw helping lines
cr.Color = new Color (1, 0.2, 0.2, 0.6);
cr.Arc(c.X, c.Y, 0.05, 0, 2*Math.PI);
cr.Fill();
cr.LineWidth = 0.03;
cr.Arc(c.X, c.Y, radius, angle1, angle1);
cr.LineTo(c);
cr.Arc(c.X, c.Y, radius, angle2, angle2);
cr.LineTo(c);
cr.Stroke();
}示例2: GeneratePuzzlePiece
public static Gdk.Pixbuf GeneratePuzzlePiece(TypeColors tc, int size)
{
Gdk.Pixbuf pb;
using (ImageSurface imsu = new ImageSurface (Format.ARGB32, size, size)) {
using (Context ctx = new Context (imsu)) {
ctx.Color = White;
ctx.Paint ();
double x1 = 0.9d * size, x0 = size - x1, x2 = 0.35d * size, x3 = 0.55d * size, x4 = 0.45d * size;
ctx.MoveTo (0.0d, x0);
ctx.LineTo (x2, x0);
ctx.Arc (x4, x0, x0, Math.PI, 2.0d * Math.PI);
ctx.LineTo (x1, x0);
ctx.LineTo (x1, x2 + x0);
ctx.Arc (x1, x4 + x0, x0, 1.5d * Math.PI, 2.5d * Math.PI);
ctx.LineTo (x1, size);
ctx.LineTo (x3, size);
ctx.ArcNegative (x4, size, x0, 2.0d * Math.PI, Math.PI);
ctx.LineTo (0.0d, size);
ctx.LineTo (0.0d, x3 + x0);
ctx.ArcNegative (0.0d, x4 + x0, x0, 2.5d * Math.PI, 1.5d * Math.PI);
ctx.ClosePath ();
ctx.Pattern = ExtensionMethods.GenerateColorSequencePattern (size, tc);
ctx.Fill ();
byte a, r, g, b;
byte[] dat = new byte[imsu.Data.Length];
for (int i = 0, j = 0; i < dat.Length;) {
b = imsu.Data [i++];
g = imsu.Data [i++];
r = imsu.Data [i++];
a = imsu.Data [i++];
dat [j++] = r;
dat [j++] = g;
dat [j++] = b;
dat [j++] = a;
}
pb = new Gdk.Pixbuf(dat,Gdk.Colorspace.Rgb,true,8,size,size,imsu.Stride);
}
}
return pb;
}示例3: Draw
//.........这里部分代码省略.........
}
//square angle
arcCenter.X = 0.5 * (arc.Middle.GeometryX + arc.End.GeometryX);
arcCenter.Y = 0.5 * (arc.Start.GeometryY + arc.Middle.GeometryY);
}
if (Math.Abs(yDeltaA) <= eps)
{
//1st is horizontal
if (Math.Abs(yDeltaB) <= eps)
{
//2nd is horizontal too
//throw new ArgumentException("Both line are horizontal");
return;
}
if (Math.Abs(xDeltaB) > eps)
{
//1st is not horizontal
//throw new NotImplementedException("Only first horizontal");
return;
}
//square angle
arcCenter.X = 0.5 * (arc.Start.GeometryX + arc.Middle.GeometryX);
arcCenter.Y = 0.5 * (arc.Middle.GeometryY + arc.End.GeometryY);
}
}
//radius
var arcRadius = Math.Sqrt(Math.Pow(arc.Start.GeometryX - arcCenter.X, 2)
+ Math.Pow(arc.Start.GeometryY - arcCenter.Y, 2));
//arc angles
var xStartDelta = arc.Start.GeometryX - arcCenter.X;
var yStartDelta = arc.Start.GeometryY - arcCenter.Y;
var xEndDelta = arc.End.GeometryX - arcCenter.X;
var yEndDelta = arc.End.GeometryY - arcCenter.Y;
//start of arc
if (Math.Abs(xStartDelta) < eps)
{
if (yStartDelta < 0.0)
{
arcStart = -0.5 * Math.PI;
}
else
{
arcStart = 0.5 * Math.PI;
}
}
else
{
arcStart = Math.Atan2(yStartDelta, xStartDelta);
}
//end of arc
if (Math.Abs(xEndDelta) < eps)
{
if (yEndDelta < 0.0)
{
arcEnd = -0.5 * Math.PI;
}
else
{
arcEnd = 0.5 * Math.PI;
}
}
else
{
arcEnd = Math.Atan2(yEndDelta, xEndDelta);
}
if (Math.Sign((arc.Middle.GeometryX - arc.Start.GeometryX)
* (arc.Middle.GeometryY - arc.End.GeometryY)
- (arc.Middle.GeometryY - arc.Start.GeometryY)
* (arc.Middle.GeometryX - arc.End.GeometryX)) < 0)
{
grw.Arc(
arcCenter.X,
arcCenter.Y,
arcRadius,
arcStart,
arcEnd);
}
else
{
grw.ArcNegative(
arcCenter.X,
arcCenter.Y,
arcRadius,
arcStart,
arcEnd);
}
grw.Stroke();
}示例4: DrawRibbon
/// <summary>Draws a ribbon.</summary>
public void DrawRibbon(Context cr, Gdk.Rectangle menuBarAllocation, Gdk.Rectangle bodyAllocation, double roundSize, double lineWidth, Ribbon widget)
{
double lineWidth05 = lineWidth / 2;
double lineWidth15 = 3 * lineWidth05;
double x0, x1, y0, y1;
LinearGradient linGrad;
if(menuBarAllocation.Height > 0)
{
cr.Rectangle (menuBarAllocation.X, menuBarAllocation.Y, menuBarAllocation.Width, menuBarAllocation.Height - 1);
linGrad = new LinearGradient (0, menuBarAllocation.Y, 0, menuBarAllocation.Y + menuBarAllocation.Height - 1);
linGrad.AddColorStop (0.0, new Color (1, 1, 1, 0.5));
linGrad.AddColorStop (0.3, new Color (1, 1, 1, 0.2));
linGrad.AddColorStop (0.3, new Color (1, 1, 1, 0.0));
linGrad.AddColorStop (1.0, new Color (1, 1, 1, 0.5));
cr.Pattern = linGrad;
cr.Fill ();
linGrad.Destroy ();
cr.MoveTo (menuBarAllocation.X, menuBarAllocation.Bottom + 0.5);
cr.LineTo (menuBarAllocation.Right, menuBarAllocation.Bottom + 0.5);
cr.Color = new Color (1, 1, 1, 0.5);
cr.LineWidth = 1;
cr.Stroke ();
// Quick Access Toolbar background
Gdk.Rectangle alloc = widget.QuickAccessToolbar.Allocation;
x0 = alloc.X;
x1 = alloc.Right - 1;
y0 = alloc.Y;
y1 = alloc.Bottom - 1;
double radius = (y1 - y0) / 2;
cr.LineWidth = 1;
if(widget.ApplicationButton != null)
{
Gdk.Rectangle alloc2 = widget.ApplicationButton.Allocation;
double cx = alloc2.X + alloc2.Width / 2;
double cy = alloc2.Y + alloc2.Height / 2;
double radius2 = x0 - cx;
double alpha = Math.Asin ((y0 - cy) / radius2);
double beta = Math.Asin ((y1 - cy) / radius2);
double curveWidth0 = Math.Cos (Math.Abs (alpha)) * radius2;
double curveWidth1 = Math.Cos (Math.Abs (beta)) * radius2;
double curveWidth = Math.Min (curveWidth0, curveWidth1);
cr.Save ();
cr.Rectangle (cx + curveWidth, y0, x1 - cx - curveWidth, alloc.Height);
cr.ClipPreserve ();
cr.ArcNegative (cx, cy, radius2, -alpha, -beta);
linGrad = new LinearGradient (0, y0, 0, y1);
linGrad.AddColorStop (0.0, colorScheme.Bright);
linGrad.AddColorStop (1.0, colorScheme.PrettyDark);
cr.Pattern = linGrad;
//cr.Color = new Color (1, 0, 0);
cr.Fill ();
cr.Restore ();
cr.Arc (x1, y0 + radius, radius - 0.5, 1.5 * Math.PI, 0.5 * Math.PI);
cr.Pattern = linGrad;
cr.Fill ();
linGrad.Destroy ();
cr.Arc (cx, cy, radius2, alpha, beta);
cr.Color = new Color (0, 0, 0, 0.6);
cr.Stroke ();
radius2 -= 1;
cr.Arc (cx, cy, radius2, alpha, beta);
cr.Color = new Color (1, 1, 1, 0.4);
cr.Stroke ();
cr.MoveTo (cx + curveWidth0, y0 - 0.5);
cr.LineTo (x1, y0 - 0.5);
cr.Color = new Color (1, 1, 1, 0.4);
cr.Stroke ();
cr.MoveTo (cx + curveWidth0, y0 + 0.5);
cr.LineTo (x1, y0 + 0.5);
cr.Color = new Color (0, 0, 0, 0.6);
cr.Stroke ();
cr.MoveTo (cx + curveWidth1, y1 - 0.5);
cr.LineTo (x1, y1 - 0.5);
cr.Color = new Color (0, 0, 0, 0.6);
cr.Stroke ();
cr.MoveTo (cx + curveWidth1, y1 + 0.5);
cr.LineTo (x1, y1 + 0.5);
cr.Color = new Color (1, 1, 1, 0.4);
cr.Stroke ();
}
else
{
cr.Rectangle (x0, y0, x1 - x0, alloc.Height);
linGrad = new LinearGradient (0, y0, 0, y1);
linGrad.AddColorStop (0.0, colorScheme.Bright);
linGrad.AddColorStop (1.0, colorScheme.PrettyDark);
cr.Pattern = linGrad;
//.........这里部分代码省略.........