correct commit f3abc2cbf2

I can't be trusted to do anything without a test.

This should fix #5. Please reopen if it doesn't.

drawing.lua

@@ -243,24 +243,39 @@ function Drawing.update()
         local mx,my = Drawing.coord(x-Margin_left), Drawing.coord(y-drawing.y)
         drawing.pending.target_point.x = mx
         drawing.pending.target_point.y = my
+        Drawing.relax_constraints(drawing, drawing.pending.target_point_index)
       end
     end
   elseif Current_drawing_mode == 'move' then
     if Drawing.in_drawing(drawing, x, y) then
       local mx,my = Drawing.coord(x-Margin_left), Drawing.coord(y-drawing.y)
-      if drawing.mode == 'manhattan' then
-        drawing.mode = 'line'
-      elseif drawing.mode == 'rectangle' or drawing.mode == 'square' then
-        drawing.mode = 'polygon'
-      end
       drawing.pending.target_point.x = mx
       drawing.pending.target_point.y = my
+      Drawing.relax_constraints(drawing, drawing.pending.target_point_index)
     end
   else
     -- do nothing
   end
 end
 
+function Drawing.relax_constraints(drawing, p)
+  for _,shape in ipairs(drawing.shapes) do
+    if shape.mode == 'manhattan' then
+      if shape.p1 == p then
+        shape.mode = 'line'
+      elseif shape.p2 == p then
+        shape.mode = 'line'
+      end
+    elseif shape.mode == 'rectangle' or shape.mode == 'square' then
+      for _,v in ipairs(shape.vertices) do
+        if v == p then
+          shape.mode = 'polygon'
+        end
+      end
+    end
+  end
+end
+
 function Drawing.mouse_released(x,y, button)
   if Current_drawing_mode == 'move' then
     Current_drawing_mode = Previous_drawing_mode
@@ -474,13 +489,13 @@ function Drawing.keychord_pressed(chord)
     end
     drawing.pending.mode = 'circle'
   elseif chord == 'C-u' and not App.mouse_down(1) then
-    local drawing_index,drawing,_,p = Drawing.select_point_at_mouse()
+    local drawing_index,drawing,i,p = Drawing.select_point_at_mouse()
     if drawing then
       if Previous_drawing_mode == nil then
         Previous_drawing_mode = Current_drawing_mode
       end
       Current_drawing_mode = 'move'
-      drawing.pending = {mode=Current_drawing_mode, target_point=p}
+      drawing.pending = {mode=Current_drawing_mode, target_point=p, target_point_index=i}
       Lines.current_drawing_index = drawing_index
       Lines.current_drawing = drawing
     end

drawing_tests.lua

@@ -421,7 +421,6 @@ function test_move_point()
   check_eq(p1.y, 6, 'F - test_move_point/baseline/p1:y')
   check_eq(p2.x, 35, 'F - test_move_point/baseline/p2:x')
   check_eq(p2.y, 36, 'F - test_move_point/baseline/p2:y')
-  check_nil(p2.name, 'F - test_move_point/baseline/p2:name')
   -- wait until save
   App.wait_fake_time(3.1)
   App.update(0)
@@ -458,6 +457,32 @@ function test_move_point()
   check_eq(p2.y, 44, 'F - test_move_point/save/y')
 end
 
+function test_move_point_on_manhattan_line()
+  io.write('\ntest_move_point_on_manhattan_line')
+  -- create a drawing with a manhattan line
+  Filename = 'foo'
+  App.screen.init{width=Margin_left+300, height=300}
+  Lines = load_array{'```lines', '```', ''}
+  Line_width = 256  -- drawing coordinates 1:1 with pixels
+  Current_drawing_mode = 'manhattan'
+  App.draw()
+  App.run_after_mouse_press(Margin_left+5, Margin_top+Drawing_padding_top+6, 1)
+  App.run_after_mouse_release(Margin_left+35, Margin_top+Drawing_padding_top+46, 1)
+  local drawing = Lines[1]
+  check_eq(#drawing.shapes, 1, 'F - test_move_point_on_manhattan_line/baseline/#shapes')
+  check_eq(#drawing.points, 2, 'F - test_move_point_on_manhattan_line/baseline/#points')
+  check_eq(drawing.shapes[1].mode, 'manhattan', 'F - test_move_point_on_manhattan_line/baseline/shape:1')
+  App.draw()
+  -- enter 'move' mode
+  App.run_after_keychord('C-u')
+  check_eq(Current_drawing_mode, 'move', 'F - test_move_point_on_manhattan_line/mode:1')
+  -- move point
+  App.mouse_move(Margin_left+26, Margin_top+Drawing_padding_top+44)
+  App.update(0.05)
+  -- line is no longer manhattan
+  check_eq(drawing.shapes[1].mode, 'line', 'F - test_move_point_on_manhattan_line/baseline/shape:1')
+end
+
 function test_delete_lines_at_point()
   io.write('\ntest_delete_lines_at_point')
   -- create a drawing with two lines connected at a point

geom.lua

@@ -22,8 +22,6 @@ function geom.on_shape(x,y, drawing, shape)
         x1,x2 = x2,x1
       end
       return x >= x1*0.95 and x <= x2*1.05
-    else
-      assert(false)
     end
   elseif shape.mode == 'polygon' or shape.mode == 'rectangle' or shape.mode == 'square' then
     return geom.on_polygon(x,y, drawing, shape)