Factor out a commonly used expression

node_board/main.cpp

@@ -124,10 +124,11 @@ int main() {
     // Ground pads and traces
     double const cable_pad_width = (width - 2 * min_cut_thickness) / 3;
     double const cable_pad_height = soic_btm_y - min_cut_thickness;
+    double const bridge_offset = 0.5 * (pad_width - min_trace_thickness);
     board.draw_rectangle(0, cable_pad_width, 0, cable_pad_height);
     board.draw_rectangle(0, min_trace_thickness, 0, height);
-    board.draw_rectangle(soic_x_min + 0.5 * (pad_width - min_trace_thickness),
-                         soic_x_min + 0.5 * (pad_width - min_trace_thickness) + min_trace_thickness,
+    board.draw_rectangle(soic_x_min + bridge_offset,
+                         soic_x_min + bridge_offset + min_trace_thickness,
                          cable_pad_height,
                          cable_pad_height + min_cut_thickness);
     board.draw_rectangle(0,
@@ -147,15 +148,15 @@ int main() {
                          soic_x_max + min_cut_thickness + min_trace_thickness,
                          cable_pad_height,
                          soic_btm_y + pad_height + min_cut_thickness);
-    board.draw_rectangle(soic_x_min + 0.5 * (pad_width - min_trace_thickness),
+    board.draw_rectangle(soic_x_min + bridge_offset,
                          soic_x_max + min_cut_thickness + min_trace_thickness,
                          soic_btm_y + pad_height + min_cut_thickness,
                          soic_btm_y + pad_height + min_cut_thickness + min_trace_thickness);
-    board.draw_rectangle(soic_x_min + 0.5 * (pad_width - min_trace_thickness),
-                         soic_x_min + 0.5 * (pad_width - min_trace_thickness) + min_trace_thickness,
+    board.draw_rectangle(soic_x_min + bridge_offset,
+                         soic_x_min + bridge_offset + min_trace_thickness,
                          soic_btm_y + pad_height + min_cut_thickness,
                          soic_top_y + min_cut_thickness);
-    board.draw_rectangle(soic_x_min + 0.5 * (pad_width - min_trace_thickness),
+    board.draw_rectangle(soic_x_min + bridge_offset,
                          data_pad_x_max,
                          soic_top_y + min_cut_thickness,
                          soic_top_y + min_cut_thickness + min_trace_thickness);
@@ -180,7 +181,7 @@ int main() {
                          width,
                          soic_top_y - pad_height - min_cut_thickness,
                          height - cable_pad_height);
-    double const vcc_pin_x = soic_x_min + soic_pitch + 0.5 * (pad_width - min_trace_thickness);
+    double const vcc_pin_x = soic_x_min + soic_pitch + bridge_offset;
     board.draw_rectangle(vcc_pin_x,
                          width,
                          soic_top_y - pad_height - min_cut_thickness - min_trace_thickness,