fix issue #2: single quadrant mode is supported

gerberex/rs274x.py

@@ -208,6 +208,7 @@ class GerberContext(FileSettings):
                        1, 0,
                        1, 1)
 
+        self.in_single_quadrant_mode = False
         self.op = None
         self.interpolation = self.IP_LINEAR
         self.direction = self.DIR_CLOCKWISE
@@ -237,6 +238,9 @@ class GerberContext(FileSettings):
         elif isinstance(stmt, ADParamStmt) and not isinstance(stmt, AMParamStmtEx):
             stmt = ADParamStmtEx.from_stmt(stmt)
             return (self.TYPE_AD, [stmt])
+        elif isinstance(stmt, QuadrantModeStmt):
+            self.in_single_quadrant_mode = stmt.mode == 'single-quadrant'
+            stmt.mode = 'multi-quadrant'
         elif isinstance(stmt, CoordStmt):
             self._normalize_coordinate(stmt)
 
@@ -262,22 +266,23 @@ class GerberContext(FileSettings):
                 self.scale[1] * mx, self.scale[0] * my)
 
     def _normalize_coordinate(self, stmt):
+        if stmt.function == 'G01' or stmt.function == 'G1':
+            self.interpolation = self.IP_LINEAR
+        elif stmt.function == 'G02' or stmt.function == 'G2':
+            self.interpolation = self.IP_ARC
+            self.direction = self.DIR_CLOCKWISE
+            if self.mirror[0] != self.mirror[1]:
+                stmt.function = 'G03'
+        elif stmt.function == 'G03' or stmt.function == 'G3':
+            self.interpolation = self.IP_ARC
+            self.direction = self.DIR_COUNTERCLOCKWISE
+            if self.mirror[0] != self.mirror[1]:
+                stmt.function = 'G02'
         if stmt.only_function:
-            if stmt.function == 'G01' or stmt.function == 'G1':
-                self.interpolation = self.IP_LINEAR
-            elif stmt.function == 'G02' or stmt.function == 'G2':
-                self.interpolation = self.IP_ARC
-                self.direction = self.DIR_CLOCKWISE
-                if self.mirror[0] != self.mirror[1]:
-                    self.direction = self.DIR_COUNTERCLOCKWISE
-                    stmt.function = 'G03'
-            elif stmt.function == 'G03' or stmt.function == 'G3':
-                self.interpolation = self.IP_ARC
-                self.direction = self.DIR_COUNTERCLOCKWISE
-                if self.mirror[0] != self.mirror[1]:
-                    self.direction = self.DIR_CLOCKWISE
-                    stmt.function = 'G02'
             return
+
+        last_x = self.x
+        last_y = self.y
         if self.notation == 'absolute':
             x = stmt.x if stmt.x is not None else self.x
             y = stmt.y if stmt.y is not None else self.y
@@ -291,5 +296,15 @@ class GerberContext(FileSettings):
         stmt.x = self.matrix[0] * x + self.matrix[1]
         stmt.y = self.matrix[2] * y + self.matrix[3]
         if stmt.op == 'D01' and self.interpolation == self.IP_ARC:
-            stmt.i = self.matrix[4] * stmt.i if stmt.i is not None else 0
-            stmt.j = self.matrix[5] * stmt.j if stmt.j is not None else 0
+            qx, qy = 1, 1
+            if self.in_single_quadrant_mode:
+                if self.direction == self.DIR_CLOCKWISE:
+                    qx = 1 if y > last_y else -1
+                    qy = 1 if x < last_x else -1
+                else:
+                    qx = 1 if y < last_y else -1
+                    qy = 1 if x > last_x else -1
+                if last_x == x and last_y == y:
+                    qx, qy = 0, 0
+            stmt.i = qx * self.matrix[4] * stmt.i if stmt.i is not None else 0
+            stmt.j = qy * self.matrix[5] * stmt.j if stmt.j is not None else 0

tests/data/ref_gerber_single_quadrant.gtl

@@ -0,0 +1,40 @@
+%MOMM*%
+%FSLAX34Y34*%
+%IPPOS*%
+%ADD10C,0.1*%
+G74*
+%LPD*%
+
+D10*
+
+G36*
+G01*
+X0Y10000D02*
+Y90000D01*
+G02*
+X10000Y100000I10000*
+X20000Y90000J10000*
+G01*
+Y20000*
+X40000*
+G02*
+X50000Y10000J10000*
+X40000Y0I10000*
+G01*
+X10000*
+G02*
+X0Y10000J10000*
+G37*
+
+G03*
+X70000Y50000D02*
+X60000Y60000I10000D01*
+X50000Y50000J10000*
+X60000Y40000I10000*
+X70000Y50000J10000*
+
+G02*
+X60000Y90000D02*
+X60000Y90000I10000D01*
+
+M02*

tests/expects/RS2724x_single_quadrant.gtl

@@ -0,0 +1,35 @@
+%MOMM*%
+%FSLAX34Y34*%
+%IPPOS*%
+%ADD10C,0.1*%
+G75*
+%LPD*%
+D10*
+G36*
+G01*
+X0Y10000D02*
+X0Y90000D01*
+G02*
+X10000Y100000I10000J0D01*
+X20000Y90000I0J-10000D01*
+G01*
+X20000Y20000D01*
+X40000Y20000D01*
+G02*
+X50000Y10000I0J-10000D01*
+X40000Y0I-10000J0D01*
+G01*
+X10000Y0D01*
+G02*
+X0Y10000I0J10000D01*
+G37*
+G03*
+X70000Y50000D02*
+X60000Y60000I-10000J0D01*
+X50000Y50000I0J-10000D01*
+X60000Y40000I10000J0D01*
+X70000Y50000I0J10000D01*
+G02*
+X60000Y90000D02*
+X60000Y90000I0J0D01*
+M02*

tests/test_rs274x.py

@@ -17,6 +17,7 @@ class TestRs274x(unittest.TestCase):
         cls.OUTPREFIX = 'RS2724x_'
         cls.METRIC_FILE = os.path.join(cls.INDIR, 'ref_gerber_metric.gtl')
         cls.INCH_FILE = os.path.join(cls.INDIR, 'ref_gerber_inch.gtl')
+        cls.SQ_FILE = os.path.join(cls.INDIR, 'ref_gerber_single_quadrant.gtl')
         try:
             os.mkdir(cls.OUTDIR)
         except FileExistsError:
@@ -65,5 +66,11 @@ class TestRs274x(unittest.TestCase):
         gerber.write(outfile)
         self._checkResult(outfile)
 
+    def test_single_quadrant(self):
+        outfile = os.path.join(self.OUTDIR, self.OUTPREFIX + 'single_quadrant.gtl')
+        gerber = gerberex.read(self.SQ_FILE)
+        gerber.write(outfile)
+        self._checkResult(outfile)
+
 if __name__ == '__main__':
     unittest.main()