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EraserTool.cs
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EraserTool.cs
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//
// EraserTool.cs
//
// Author:
// Jonathan Pobst <monkey@jpobst.com>
//
// Copyright (c) 2010 Jonathan Pobst
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using Cairo;
using Gtk;
using Pinta.Core;
namespace Pinta
{
public class EraserTool : BaseTool
{
private static Point point_empty = new Point (-500, -500);
private Point last_point = point_empty;
private ToolBarComboBox brush_width;
private ToolBarLabel brush_width_label;
private ToolBarButton brush_width_minus;
private ToolBarButton brush_width_plus;
private ImageSurface undo_surface;
private bool surface_modified;
public EraserTool ()
{
}
#region Properties
public override string Name { get { return "Eraser"; } }
public override string Icon { get { return "Tools.Eraser.png"; } }
public override string StatusBarText { get { return "Click and drag to erase a portion of the image"; } }
public override bool Enabled { get { return true; } }
private int BrushWidth {
get { return int.Parse (brush_width.ComboBox.ActiveText); }
set { (brush_width.ComboBox as Gtk.ComboBoxEntry).Entry.Text = value.ToString (); }
}
#endregion
#region ToolBar
protected override void OnBuildToolBar (Toolbar tb)
{
base.OnBuildToolBar (tb);
if (brush_width_label == null)
brush_width_label = new ToolBarLabel (" Brush width: ");
tb.AppendItem (brush_width_label);
if (brush_width_minus == null) {
brush_width_minus = new ToolBarButton ("Toolbar.MinusButton.png", "", "Decrease brush size");
brush_width_minus.Clicked += MinusButtonClickedEvent;
}
tb.AppendItem (brush_width_minus);
if (brush_width == null)
brush_width = new ToolBarComboBox (50, 1, true, "1", "2", "3", "4", "5", "6", "7", "8", "9",
"10", "11", "12", "13", "14", "15", "20", "25", "30", "35",
"40", "45", "50", "55");
tb.AppendItem (brush_width);
if (brush_width_plus == null) {
brush_width_plus = new ToolBarButton ("Toolbar.PlusButton.png", "", "Increase brush size");
brush_width_plus.Clicked += PlusButtonClickedEvent;
}
tb.AppendItem (brush_width_plus);
}
private void MinusButtonClickedEvent (object o, EventArgs args)
{
if (BrushWidth > 1)
BrushWidth--;
}
private void PlusButtonClickedEvent (object o, EventArgs args)
{
BrushWidth++;
}
#endregion
#region Mouse Handlers
protected override void OnMouseDown (Gtk.DrawingArea canvas, Gtk.ButtonPressEventArgs args, Cairo.PointD point)
{
surface_modified = false;
undo_surface = PintaCore.Layers.CurrentLayer.Surface.Clone ();
}
protected override void OnMouseMove (object o, Gtk.MotionNotifyEventArgs args, Cairo.PointD point)
{
if ((args.Event.State & Gdk.ModifierType.Button1Mask) != Gdk.ModifierType.Button1Mask
&& (args.Event.State & Gdk.ModifierType.Button3Mask) != Gdk.ModifierType.Button3Mask
) {
last_point = point_empty;
return;
}
DrawingArea drawingarea1 = (DrawingArea)o;
int x = (int)point.X;
int y = (int)point.Y;
if (last_point.Equals (point_empty)) {
last_point = new Point (x, y);
return;
}
if (PintaCore.Workspace.PointInCanvas (point))
surface_modified = true;
ImageSurface surf = PintaCore.Layers.CurrentLayer.Surface;
using (Context g = new Context (surf)) {
g.Antialias = Antialias.Subpixel;
g.MoveTo (last_point.X, last_point.Y);
g.LineTo (x, y);
g.Operator = Operator.Clear;
g.LineWidth = int.Parse (brush_width.ComboBox.ActiveText);
g.LineJoin = LineJoin.Round;
g.LineCap = LineCap.Round;
g.Stroke ();
}
Gdk.Rectangle r = GetRectangleFromPoints (last_point, new Point (x, y));
PintaCore.Workspace.InvalidateRect (r, true);
last_point = new Point (x, y);
}
protected override void OnMouseUp (Gtk.DrawingArea canvas, Gtk.ButtonReleaseEventArgs args, Cairo.PointD point)
{
if (surface_modified)
PintaCore.History.PushNewItem (new SimpleHistoryItem (Icon, Name, undo_surface, PintaCore.Layers.CurrentLayerIndex));
else if (undo_surface != null)
(undo_surface as IDisposable).Dispose ();
surface_modified = false;
}
#endregion
#region Private Methods
private Gdk.Rectangle GetRectangleFromPoints (Point a, Point b)
{
int x = Math.Min (a.X, b.X) - BrushWidth - 2;
int y = Math.Min (a.Y, b.Y) - BrushWidth - 2;
int w = Math.Max (a.X, b.X) - x + (BrushWidth * 2) + 4;
int h = Math.Max (a.Y, b.Y) - y + (BrushWidth * 2) + 4;
return new Gdk.Rectangle (x, y, w, h);
}
#endregion
}
}