1 files changed, 140 insertions, 0 deletions
diff --git a/gerbonara/gerber/graphic_primitives.py b/gerbonara/gerber/graphic_primitives.py
new file mode 100644
index 0000000..391a452
--- /dev/null
+++ b/gerbonara/gerber/graphic_primitives.py
@@ -0,0 +1,140 @@
+
+import math
+import itertools
+
+from dataclasses import dataclass, KW_ONLY, replace
+
+from gerber_statements import *
+
+
+class GraphicPrimitive:
+    _ : KW_ONLY
+    polarity_dark : bool = True
+
+
+def rotate_point(x, y, angle, cx=None, cy=None):
+    if cx is None:
+        return (x, y)
+    else:
+        return (cx + (x - cx) * math.cos(angle) - (y - cy) * math.sin(angle),
+                cy + (x - cx) * math.sin(angle) + (y - cy) * math.cos(angle))
+
+
+@dataclass
+class Circle(GraphicPrimitive):
+    x : float
+    y : float
+    r : float # Here, we use radius as common in modern computer graphics, not diameter as gerber uses.
+
+    def bounds(self):
+        return ((self.x-self.r, self.y-self.r), (self.x+self.r, self.y+self.r))
+
+
+@dataclass
+class Obround(GraphicPrimitive):
+    x : float
+    y : float
+    w : float
+    h : float
+    rotation : float # radians!
+
+    def decompose(self):
+        ''' decompose obround to two circles and one rectangle '''
+
+        cx = self.x + self.w/2
+        cy = self.y + self.h/2
+
+        if self.w > self.h:
+            x = self.x + self.h/2
+            yield Circle(x, cy, self.h/2)
+            yield Circle(x + self.w, cy, self.h/2)
+            yield Rectangle(x, self.y, self.w - self.h, self.h)
+
+        elif self.h > self.w:
+            y = self.y + self.w/2
+            yield Circle(cx, y, self.w/2)
+            yield Circle(cx, y + self.h, self.w/2)
+            yield Rectangle(self.x, y, self.w, self.h - self.w)
+
+        else:
+            yield Circle(cx, cy, self.w/2)
+
+    def bounds(self):
+        return ((self.x-self.w/2, self.y-self.h/2), (self.x+self.w/2, self.y+self.h/2))
+
+
+@dataclass
+class ArcPoly(GraphicPrimitive):
+    """ Polygon whose sides may be either straight lines or circular arcs """
+
+    # list of (x : float, y : float) tuples. Describes closed outline, i.e. first and last point are considered
+    # connected.
+    outline : list(tuple(float))
+    # list of radii of segments, must be either None (all segments are straight lines) or same length as outline.
+    # Straight line segments have None entry.
+    arc_centers : list(tuple(float))
+
+    @property
+    def segments(self):
+        return itertools.zip_longest(self.outline[:-1], self.outline[1:], self.radii or [])
+
+    def bounds(self):
+        for (x1, y1), (x2, y2), radius in self.segments:
+            return 
+
+
+@dataclass
+class Line(GraphicPrimitive):
+    x1 : float
+    y1 : float
+    x2 : float
+    y2 : float
+    width : float
+
+    # FIXME bounds
+
+@dataclass
+class Arc(GraphicPrimitive):
+    x : float
+    y : float
+    r : float
+    angle1 : float # radians!
+    angle2 : float # radians!
+    width : float
+
+    # FIXME bounds
+
+@dataclass
+class Rectangle(GraphicPrimitive):
+    # coordinates are center coordinates
+    x : float
+    y : float
+    w : float
+    h : float
+    rotation : float # radians, around center!
+
+    def bounds(self):
+        return ((self.x, self.y), (self.x+self.w, self.y+self.h))
+
+    @prorperty
+    def center(self):
+        return self.x + self.w/2, self.y + self.h/2
+
+
+class RegularPolygon(GraphicPrimitive):
+    x : float
+    y : float
+    r : float
+    n : int
+    rotation : float # radians!
+
+    def decompose(self):
+        ''' convert n-sided gerber polygon to normal Region defined by outline '''
+
+        delta = 2*math.pi / self.n
+
+        yield Region([
+                (self.x + math.cos(self.rotation + i*delta) * self.r,
+                 self.y + math.sin(self.rotation + i*delta) * self.r)
+                for i in range(self.n) ])
+