Correcting transparent line draw issues; moving brush settings to method call; refactored erase to extend line

src/data/events/brushes/arrow.py

@@ -32,12 +32,14 @@ class Arrow(BrushEvent):
         self.points[1] = Point(eve.x, eve.y)
         self.is_valid = True
 
-
-    def process(self, brush: cairo.Context):
+    def set_brush_data(self, brush):
         brush.set_line_width(self.size)
         brush.set_line_cap(1) # 0 = BUTT, 1 = ROUND, 2 = SQUARE
         brush.set_source_rgba(*self.color)
-        brush.set_operator(cairo.OPERATOR_OVER);
+        brush.set_operator(cairo.OPERATOR_OVER)
+
+    def process(self, brush: cairo.Context):
+        self.set_brush_data(brush)
 
         x1, y1 = self.points[0].x, self.points[0].y
         x2, y2 = self.points[1].x, self.points[1].y

src/data/events/brushes/circle.py

@@ -27,11 +27,15 @@ class Circle(BrushEvent):
         self.points.append( Point(eve.x, eve.y) )
         self.is_valid = True
 
-    def process(self, brush: cairo.Context):
+    def set_brush_data(self, brush):
         brush.set_source_rgba(*self.color)
-        brush.set_operator(cairo.OPERATOR_OVER);
+        brush.set_operator(cairo.OPERATOR_OVER)
+
+    def process(self, brush: cairo.Context):
+        self.set_brush_data(brush)
 
         for point in self.points:
             brush.move_to(point.x, point.y)
             brush.arc(point.x, point.y, self.size, 0, 2 * 3.14)
-            brush.fill()
+
+        brush.fill()

src/data/events/brushes/erase.py

@@ -7,36 +7,17 @@ import cairo
 from data.point import Point
 from data.points import Points
 
-from . import BrushEvent
+from . import Line
 
 
-class Erase(BrushEvent):
+class Erase(Line):
     def __init__(self):
         super(Erase, self).__init__()
 
         self.points: Points = Points()
 
-    def __copy__(self):
-        copy       = type(self)()
-        copy.color = self.color
-
-        return copy
-
-
-    def update(self, eve):
-        self.points.append( Point(eve.x, eve.y) )
-        self.is_valid = True
-
-    def process(self, brush: cairo.Context):
-        if len(self.points) < 2: return
-
+    def set_brush_data(self, brush):
         brush.set_line_width(self.size)
         brush.set_line_cap(1) # 0 = BUTT, 1 = ROUND, 2 = SQUARE
         brush.set_source_rgba(*self.color)
-        brush.set_operator(cairo.OPERATOR_CLEAR);
-
-        brush.move_to(self.points[0].x, self.points[0].y)
-        for point in self.points[1 : -1]:
-            brush.line_to(point.x, point.y)
-            brush.stroke()
-            brush.move_to(point.x, point.y)
+        brush.set_operator(cairo.OPERATOR_CLEAR)

src/data/events/brushes/grid.py

@@ -26,9 +26,12 @@ class Grid(BrushEvent):
     def update(self, eve):
         self.is_valid = True
 
-    def process(self, brush: cairo.Context):
+    def set_brush_data(self, brush):
         brush.set_source_rgba(*self.color)
 
+    def process(self, brush: cairo.Context):
+        self.set_brush_data(brush)
+
         # Draw vertical lines
         x = 0
         while x < self.width:

src/data/events/brushes/line.py

@@ -28,15 +28,18 @@ class Line(BrushEvent):
         if len(self.points) < 2: return
         self.is_valid = True
 
-    def process(self, brush: cairo.Context):
-
+    def set_brush_data(self, brush):
         brush.set_line_width(self.size)
         brush.set_line_cap(1) # 0 = BUTT, 1 = ROUND, 2 = SQUARE
         brush.set_source_rgba(*self.color)
-        brush.set_operator(cairo.OPERATOR_OVER);
+        brush.set_operator(cairo.OPERATOR_OVER)
+
+    def process(self, brush: cairo.Context):
+        self.set_brush_data(brush)
 
         brush.move_to(self.points[0].x, self.points[0].y)
         for point in self.points[1 : -1]:
             brush.line_to(point.x, point.y)
-            brush.stroke()
             brush.move_to(point.x, point.y)
+
+        brush.stroke()

src/data/events/brushes/square.py

@@ -31,13 +31,18 @@ class Square(BrushEvent):
         self.points[1] = Point(eve.x, eve.y)
         self.is_valid = True
 
+    def set_brush_data(self, brush):
+        brush.set_source_rgba(*self.color)
+        brush.set_operator(cairo.OPERATOR_OVER)
+
     def process(self, brush: cairo.Context):
+        self.set_brush_data(brush)
+
         x1, y1 = self.points[0].x, self.points[0].y
         x2, y2 = self.points[1].x, self.points[1].y
         w      = x2 - x1
         h      = y2 - y1
 
-        brush.set_source_rgba(*self.color)
-        brush.set_operator(cairo.OPERATOR_OVER);
         brush.rectangle(x1, y1, w, h)
+
         brush.fill()