Implemented difference (XOR) option for symbols.

data/en.mse-locale/locale

-mse version: 0.3.2
+mse version: 0.3.2
 full name: English
 
 ############################################################## Menu items
@@ -194,6 +194,7 @@ help:
 	merge:				Merges this shape with those below it
 	subtract:			Subtracts this shape from shapes below it, leaves only the area in that shape that is not in this shape
 	intersect:			Intersects this shape with shapes below it, leaves only the area in both shapes
+	difference:			Differs this shape from the shapes below it, leaves only the area not in any other shape
 	overlap:			Place this shape, and its border above shapes below it
 	border:				Draws this shape as a border
 	
@@ -251,6 +252,7 @@ tool:
 	merge:				Merge
 	subtract:			Subtract
 	intersect:			Intersect
+	difference:			Difference
 	overlap:			Overlap
 	border:				Border
 	
@@ -317,6 +319,7 @@ tooltip:
 	merge:				Merge with shapes below
 	subtract:			Subtract from shapes below
 	intersect:			Intersect with shapes below
+	difference:			Differ from shapes below
 	overlap:			Place above other shapes
 	border:				Draw as a border
 	

src/gui/symbol/select_editor.cpp

@@ -110,8 +110,8 @@ void SymbolSelectEditor::initUI(wxToolBar* tb, wxMenuBar* mb) {
 	tb->AddSeparator();
 	tb->AddTool(ID_PART_MERGE,			_TOOL_("merge"),	 load_resource_image(_("combine_or")),		wxNullBitmap, wxITEM_CHECK, _TOOLTIP_("merge"),		_HELP_("merge"));
 	tb->AddTool(ID_PART_SUBTRACT,		_TOOL_("subtract"),	 load_resource_image(_("combine_sub_dark")),	wxNullBitmap, wxITEM_CHECK, _TOOLTIP_("subtract"),	_HELP_("subtract"));
-	tb->AddTool(ID_PART_INTERSECTION,	_TOOL_("intersect"),load_resource_image(_("combine_and_dark")),	wxNullBitmap, wxITEM_CHECK, _TOOLTIP_("intersect"),	_HELP_("intersect"));
-	// note: difference doesn't work (yet)
+	tb->AddTool(ID_PART_INTERSECTION,	_TOOL_("intersect"), load_resource_image(_("combine_and_dark")),	wxNullBitmap, wxITEM_CHECK, _TOOLTIP_("intersect"),	_HELP_("intersect"));
+	tb->AddTool(ID_PART_DIFFERENCE,		_TOOL_("difference"),load_resource_image(_("combine_xor")),			wxNullBitmap, wxITEM_CHECK, _TOOLTIP_("difference"),	_HELP_("difference"));
 	tb->AddTool(ID_PART_OVERLAP,		_TOOL_("overlap"),	 load_resource_image(_("combine_over")),		wxNullBitmap, wxITEM_CHECK, _TOOLTIP_("overlap"),	_HELP_("overlap"));
 	tb->AddTool(ID_PART_BORDER,			_TOOL_("border"),	 load_resource_image(_("combine_border")),	wxNullBitmap, wxITEM_CHECK, _TOOLTIP_("border"),	_HELP_("border"));
 	tb->Realize();
@@ -120,6 +120,7 @@ void SymbolSelectEditor::destroyUI(wxToolBar* tb, wxMenuBar* mb) {
 	tb->DeleteTool(ID_PART_MERGE);
 	tb->DeleteTool(ID_PART_SUBTRACT);
 	tb->DeleteTool(ID_PART_INTERSECTION);
+	tb->DeleteTool(ID_PART_DIFFERENCE);
 	tb->DeleteTool(ID_PART_OVERLAP);
 	tb->DeleteTool(ID_PART_BORDER);
 	// HACK: hardcoded size of rest of toolbar

src/render/symbol/viewer.cpp

@@ -138,39 +138,41 @@ void SymbolViewer::highlightPart(DC& dc, const SymbolPart& part, HighlightStyle
 void SymbolViewer::combineSymbolPart(const SymbolPart& part, DC& border, DC& interior, bool directB, bool directI) {
 	// what color should the interior be?
 	// use black when drawing to the screen
-	int interiorCol = directI ? 0 : 255;
+	unsigned char interiorCol = directI ? 0 : 255;
 	// how to draw depends on combining mode
 	switch(part.combine) {
 		case PART_OVERLAP:
 		case PART_MERGE: {
-			drawSymbolPart(part, &border, &interior, 255, interiorCol, directB);
+			drawSymbolPart(part, &border, &interior, 255, interiorCol, directB, false);
 			break;
 		} case PART_SUBTRACT: {
 			border.SetLogicalFunction(wxAND);
-			drawSymbolPart(part, &border, &interior, 0, interiorCol ^ 255, directB);
+			drawSymbolPart(part, &border, &interior, 0, ~interiorCol, true, true);
 			border.SetLogicalFunction(wxCOPY);
 			break;
 		} case PART_INTERSECTION: {
 			MemoryDCP keepBorder   = getTempDC(border);
 			MemoryDCP keepInterior = getTempDC(interior);
-			drawSymbolPart(part, keepBorder.get(), keepInterior.get(), 255, 255, false);
+			drawSymbolPart(part, keepBorder.get(), keepInterior.get(), 255, 255, false, false);
 			// combine the temporary dcs with the result using the AND operator
 			wxSize s = border.GetSize();
-			border  .Blit(0, 0, s.GetWidth(), s.GetHeight(), &*keepBorder,   0, 0, wxAND);
+			border  .Blit(0, 0, s.GetWidth(), s.GetHeight(), &*keepBorder  , 0, 0, wxAND);
 			interior.Blit(0, 0, s.GetWidth(), s.GetHeight(), &*keepInterior, 0, 0, wxAND);
 			break;
 		} case PART_DIFFERENCE: {
-			// TODO
+			interior.SetLogicalFunction(wxXOR);
+			drawSymbolPart(part, &border, &interior, 0, ~interiorCol, directB, true);
+			interior.SetLogicalFunction(wxCOPY);
 			break;
 		} case PART_BORDER: {
 			// draw border as interior
-			drawSymbolPart(part, nullptr, &border, 0, 255, false);
+			drawSymbolPart(part, nullptr, &border, 0, 255, false, false);
 			break;
 		}
 	}
 }
 
-void SymbolViewer::drawSymbolPart(const SymbolPart& part, DC* border, DC* interior, int borderCol, int interiorCol, bool directB) {
+void SymbolViewer::drawSymbolPart(const SymbolPart& part, DC* border, DC* interior, unsigned char borderCol, unsigned char interiorCol, bool directB, bool clear) {
 	// create point list
 	vector<wxPoint> points;
 	size_t size = part.points.size();
@@ -179,15 +181,20 @@ void SymbolViewer::drawSymbolPart(const SymbolPart& part, DC* border, DC* interi
 	}
 	// draw border
 	if (border) {
-		if (directB) {
-			// white/green
-			border->SetBrush(Color(borderCol, min(255,borderCol + 128), borderCol));
-		} else {
 		// white/black
-			border->SetBrush(Color(borderCol, borderCol, borderCol));
-		}
+		border->SetBrush(Color(borderCol, borderCol^(directB ? 128 : 0), borderCol));
 		border->SetPen(wxPen(*wxWHITE, (int) rotation.trS(border_radius)));
 		border->DrawPolygon((int)points.size(), &points[0]);
+
+		if (clear) {
+			border->SetPen(*wxTRANSPARENT_PEN);
+			border->SetBrush(Color(0, (directB ? 128 : 0), 0));
+
+			int func = border->GetLogicalFunction();
+			border->SetLogicalFunction(wxCOPY);
+			border->DrawPolygon((int)points.size(), &points[0]);
+			border->SetLogicalFunction(func);
+		}
 	}
 	// draw interior
 	if (interior) {

src/render/symbol/viewer.hpp

@@ -60,7 +60,7 @@ class SymbolViewer : public SymbolView {
 	 *  The **Col parameters give the color to use for the (interior of) the border and the interior
 	 *  default should be white (255) border and black (0) interior.
 	 */
-	void drawSymbolPart(const SymbolPart& part, DC* border, DC* interior, int borderCol, int interiorCol, bool directB);
+	void drawSymbolPart(const SymbolPart& part, DC* border, DC* interior, unsigned char borderCol, unsigned char interiorCol, bool directB, bool oppB);
 /*	
 	// ------------------- Bezier curve calculation