C# Cairo.Context.MoveTo方法代码示例

        /// <summary>
        /// Draws the text.
        /// </summary>
        /// <param name="showCursor">Whether or not to show the mouse cursor in the drawing.</param>
        /// <param name="useTextLayer">Whether or not to use the TextLayer (as opposed to the Userlayer).</param>
        private void RedrawText(bool showCursor, bool useTextLayer)
        {
            Rectangle r = CurrentTextEngine.GetLayoutBounds();
            r.Inflate(10 + OutlineWidth, 10 + OutlineWidth);
            CurrentTextBounds = r;

            Rectangle cursorBounds = Rectangle.Zero;

            Cairo.ImageSurface surf;

            if (!useTextLayer)
            {
                //Draw text on the current UserLayer's surface as finalized text.
                surf = PintaCore.Workspace.ActiveDocument.CurrentUserLayer.Surface;
            }
            else
            {
                //Draw text on the current UserLayer's TextLayer's surface as re-editable text.
                surf = PintaCore.Workspace.ActiveDocument.CurrentUserLayer.TextLayer.Surface;

                ClearTextLayer();
            }

            using (var g = new Cairo.Context (surf)) {
                g.Save ();

                // Show selection if on text layer
                if (useTextLayer) {
                    // Selected Text
                    Cairo.Color c = new Cairo.Color (0.7, 0.8, 0.9, 0.5);
                    foreach (Rectangle rect in CurrentTextEngine.SelectionRectangles)
                        g.FillRectangle (rect.ToCairoRectangle (), c);
                }
                g.AppendPath (PintaCore.Workspace.ActiveDocument.Selection.SelectionPath);
                g.FillRule = Cairo.FillRule.EvenOdd;
                g.Clip ();

                g.MoveTo (new Cairo.PointD (CurrentTextEngine.Origin.X, CurrentTextEngine.Origin.Y));

                g.Color = PintaCore.Palette.PrimaryColor;

                //Fill in background
                if (BackgroundFill) {
                    using (var g2 = new Cairo.Context (surf)) {
                        g2.FillRectangle(CurrentTextEngine.GetLayoutBounds().ToCairoRectangle(), PintaCore.Palette.SecondaryColor);
                    }
                }

                // Draw the text
                if (FillText)
                    Pango.CairoHelper.ShowLayout (g, CurrentTextEngine.Layout);

                if (FillText && StrokeText) {
                    g.Color = PintaCore.Palette.SecondaryColor;
                    g.LineWidth = OutlineWidth;

                    Pango.CairoHelper.LayoutPath (g, CurrentTextEngine.Layout);
                    g.Stroke ();
                } else if (StrokeText) {
                    g.Color = PintaCore.Palette.PrimaryColor;
                    g.LineWidth = OutlineWidth;

                    Pango.CairoHelper.LayoutPath (g, CurrentTextEngine.Layout);
                    g.Stroke ();
                }

                if (showCursor) {
                    var loc = CurrentTextEngine.GetCursorLocation ();

                    g.Antialias = Cairo.Antialias.None;
                    g.DrawLine (new Cairo.PointD (loc.X, loc.Y), new Cairo.PointD (loc.X, loc.Y + loc.Height), new Cairo.Color (0, 0, 0, 1), 1);

                    cursorBounds = Rectangle.Inflate (loc, 2, 10);
                }

                g.Restore ();

                if (useTextLayer && (is_editing || ctrlKey) && !CurrentTextEngine.IsEmpty())
                {
                    //Draw the text edit rectangle.

                    g.Save();

                    g.Translate(.5, .5);

                    using (Cairo.Path p = g.CreateRectanglePath(new Cairo.Rectangle(CurrentTextBounds.Left, CurrentTextBounds.Top,
                        CurrentTextBounds.Width, CurrentTextBounds.Height - FontSize)))
                    {
                        g.AppendPath(p);
                    }

                    g.LineWidth = 1;

                    g.Color = new Cairo.Color(1, 1, 1);
                    g.StrokePreserve();
//.........这里部分代码省略.........

        protected override void OnMouseMove(object o, Gtk.MotionNotifyEventArgs args, Cairo.PointD point)
        {
            if (!painting || offset.IsNotSet ())
                return;

            int x = (int)point.X;
            int y = (int)point.Y;

            if (last_point.IsNotSet ()) {
                last_point = new Point (x, y);
                return;
            }

            using (Cairo.Context g = new Cairo.Context (PintaCore.Layers.ToolLayer.Surface)) {
                g.AppendPath (PintaCore.Layers.SelectionPath);
                g.FillRule = Cairo.FillRule.EvenOdd;
                g.Clip ();

                g.Antialias = Cairo.Antialias.Subpixel;

                g.MoveTo (last_point.X, last_point.Y);
                g.LineTo (x, y);

                g.SetSource (PintaCore.Workspace.ActiveDocument.CurrentLayer.Surface, offset.X, offset.Y);
                g.LineWidth = BrushWidth;
                g.LineCap = Cairo.LineCap.Round;

                g.Stroke ();
            }

            var dirty_rect = GetRectangleFromPoints (last_point, new Point (x, y));

            last_point = new Point (x, y);
            surface_modified = true;
            PintaCore.Workspace.Invalidate (dirty_rect);
        }

        protected Gdk.Pixbuf DrawConstDataIcon()
        {
            using (var surface = new Cairo.ImageSurface (Cairo.Format.Argb32, rectSizing.Width, rectSizing.Height)) {
                using (Cairo.Context cr = new Cairo.Context (surface)) {
                    // background
                    cr.SetSourceRGB (0.7, 0.7, 0.7);
                    cr.Paint ();

                    // text
                    cr.SetSourceRGB (1, 0, 0);
                    // simple Cairo text API instead of Pango
                    //cr.MoveTo (10, 0.3 * height);
                    //cr.SetFontSize (20);
                    //cr.ShowText ("const");

                    using (var layout = Pango.CairoHelper.CreateLayout (cr)) {
                        // font size 12 seems suitable for iconHeight 48 pixels
                        float fontSize = 12 * rectSizing.Height / 48f;
                        layout.FontDescription = Pango.FontDescription.FromString ("Sans " + fontSize.ToString ());
                        layout.SetText ("const");
                        layout.Width = rectSizing.Width;
                        layout.Alignment = Pango.Alignment.Center;
                        int lwidth, lheight;
                        layout.GetPixelSize (out lwidth, out lheight);
                        // 0, 0 = left top
                        //cr.MoveTo (0.5 * (width - lwidth), 0.5 * (height - lheight));
                        cr.MoveTo (0.5 * rectSizing.Width, 0.5 * (rectSizing.Height - lheight));
                        Pango.CairoHelper.ShowLayout (cr, layout);
                    }
                }
                return new Gdk.Pixbuf (surface.Data, Gdk.Colorspace.Rgb, true, 8, rectSizing.Width, rectSizing.Height, surface.Stride, null);
            }
        }

        private void RedrawText(bool showCursor, bool useToolLayer)
        {
            Cairo.ImageSurface surf;
            var invalidate_cursor = old_cursor_bounds;

            if (!useToolLayer)
                surf = PintaCore.Workspace.ActiveDocument.CurrentLayer.Surface;
            else {
                surf = PintaCore.Workspace.ActiveDocument.ToolLayer.Surface;
                surf.Clear ();
            }

            using (var g = new Cairo.Context (surf)) {
                g.Save ();

                // Show selection if on tool layer
                if (useToolLayer) {
                    // Selected Text
                    Cairo.Color c = new Cairo.Color (0.7, 0.8, 0.9, 0.5);
                    foreach (Rectangle rect in engine.SelectionRectangles)
                        g.FillRectangle (rect.ToCairoRectangle (), c);
                }
                g.AppendPath (PintaCore.Workspace.ActiveDocument.SelectionPath);
                g.FillRule = Cairo.FillRule.EvenOdd;
                g.Clip ();
                g.MoveTo (new Cairo.PointD (engine.Origin.X, engine.Origin.Y));
                g.Color = PintaCore.Palette.PrimaryColor;

                if (BackgroundFill)	{

                    using (var g2 = new Cairo.Context (surf)) {

                        g2.FillRectangle (engine.GetLayoutBounds ().ToCairoRectangle (),PintaCore.Palette.SecondaryColor);

                    }
            }

                if (FillText) {
                    Pango.CairoHelper.ShowLayout (g, engine.Layout);
            }

                if (FillText && StrokeText) {
                    g.Color = PintaCore.Palette.SecondaryColor;
                    g.LineWidth = OutlineWidth;

                    Pango.CairoHelper.LayoutPath (g, engine.Layout);
                    g.Stroke ();
                } else if (StrokeText) {
                    g.Color = PintaCore.Palette.PrimaryColor;
                    g.LineWidth = OutlineWidth;

                    Pango.CairoHelper.LayoutPath (g, engine.Layout);
                    g.Stroke ();
                }

                if (showCursor) {
                    var loc = engine.GetCursorLocation ();

                    g.Antialias = Cairo.Antialias.None;
                    g.DrawLine (new Cairo.PointD (loc.X, loc.Y), new Cairo.PointD (loc.X, loc.Y + loc.Height), new Cairo.Color (0, 0, 0, 1), 1);

                    loc.Inflate (2, 10);
                    old_cursor_bounds = loc;
                }

                g.Restore ();
            }

            Rectangle r = engine.GetLayoutBounds ();
            r.Inflate (10 + OutlineWidth, 10 + OutlineWidth);

            PintaCore.Workspace.Invalidate (old_bounds);
            PintaCore.Workspace.Invalidate (invalidate_cursor);
            PintaCore.Workspace.Invalidate (r);

            old_bounds = r;
        }

        internal static Gdk.Pixbuf CreateBitmap(string stockId, double width, double height, double scaleFactor)
        {
            Gdk.Pixbuf result = null;

            Gtk.IconSet iconset = Gtk.IconFactory.LookupDefault (stockId);
            if (iconset != null) {
                // Find the size that better fits the requested size
                Gtk.IconSize gsize = Util.GetBestSizeFit (width);
                result = iconset.RenderIcon (Gtk.Widget.DefaultStyle, Gtk.TextDirection.Ltr, Gtk.StateType.Normal, gsize, null, null, scaleFactor);
                if (result == null || result.Width < width * scaleFactor) {
                    var gsize2x = Util.GetBestSizeFit (width * scaleFactor, iconset.Sizes);
                    if (gsize2x != Gtk.IconSize.Invalid && gsize2x != gsize)
                        // Don't dispose the previous result since the icon is owned by the IconSet
                        result = iconset.RenderIcon (Gtk.Widget.DefaultStyle, Gtk.TextDirection.Ltr, Gtk.StateType.Normal, gsize2x, null, null);
                }
            }

            if (result == null && Gtk.IconTheme.Default.HasIcon (stockId))
                result = Gtk.IconTheme.Default.LoadIcon (stockId, (int)width, (Gtk.IconLookupFlags)0);

            if (result == null)
            {
                // render a custom gtk-missing-image icon
                // if Gtk.Stock.MissingImage is not found
                int w = (int)width;
                int h = (int)height;
                #if XWT_GTK3
                Cairo.ImageSurface s = new Cairo.ImageSurface(Cairo.Format.ARGB32, w, h);
                Cairo.Context cr = new Cairo.Context(s);
                cr.SetSourceRGB(255, 255, 255);
                cr.Rectangle(0, 0, w, h);
                cr.Fill();
                cr.SetSourceRGB(0, 0, 0);
                cr.LineWidth = 1;
                cr.Rectangle(0.5, 0.5, w - 1, h - 1);
                cr.Stroke();
                cr.SetSourceRGB(255, 0, 0);
                cr.LineWidth = 3;
                cr.LineCap = Cairo.LineCap.Round;
                cr.LineJoin = Cairo.LineJoin.Round;
                cr.MoveTo(w / 4, h / 4);
                cr.LineTo((w - 1) - w / 4, (h - 1) - h / 4);
                cr.MoveTo(w / 4, (h - 1) - h / 4);
                cr.LineTo((w - 1) - w / 4, h / 4);
                cr.Stroke();
                result = Gtk3Extensions.GetFromSurface(s, 0, 0, w, h);
                #else
                using (Gdk.Pixmap pmap = new Gdk.Pixmap (Gdk.Screen.Default.RootWindow, w, h))
                using (Gdk.GC gc = new Gdk.GC (pmap)) {
                    gc.RgbFgColor = new Gdk.Color (255, 255, 255);
                    pmap.DrawRectangle (gc, true, 0, 0, w, h);
                    gc.RgbFgColor = new Gdk.Color (0, 0, 0);
                    pmap.DrawRectangle (gc, false, 0, 0, (w - 1), (h - 1));
                    gc.SetLineAttributes (3, Gdk.LineStyle.Solid, Gdk.CapStyle.Round, Gdk.JoinStyle.Round);
                    gc.RgbFgColor = new Gdk.Color (255, 0, 0);
                    pmap.DrawLine (gc, (w / 4), (h / 4), ((w - 1) - (w / 4)), ((h - 1) - (h / 4)));
                    pmap.DrawLine (gc, ((w - 1) - (w / 4)), (h / 4), (w / 4), ((h - 1) - (h / 4)));
                    result = Gdk.Pixbuf.FromDrawable (pmap, pmap.Colormap, 0, 0, 0, 0, w, h);
                }
                #endif
            }
            return result;
        }