add margin around simulator (#46)

This adds a 10px margin around the design in the simulator view (both the Simulate plugin and the Params preview window). This is useful because otherwise stitches at the edges weren't very visible. Also, because we're using anti-aliased lines, parts of the drawing did actually extend beyond the canvas previously.

All in all, with the margin it just feels more comfortable.

1 files changed, 14 insertions, 13 deletions

diff --git a/embroider_simulate.py b/embroider_simulate.py
index 667ef7d0..063a2f35 100644
--- a/embroider_simulate.py
+++ b/embroider_simulate.py
@@ -18,6 +18,8 @@ class EmbroiderySimulator(wx.Frame):
         self.stitches_per_frame = kwargs.pop('stitches_per_frame', 1)
         self.target_duration = kwargs.pop('target_duration', None)
 
+        self.margin = 10
+
         screen_rect = wx.Display(0).ClientArea
         self.max_width = kwargs.pop('max_width', screen_rect.GetWidth())
         self.max_height = kwargs.pop('max_height', screen_rect.GetHeight())
@@ -33,7 +35,7 @@ class EmbroiderySimulator(wx.Frame):
         if self.target_duration:
             self.adjust_speed(self.target_duration)
 
-        self.buffer = wx.Bitmap(self.width * self.scale, self.height * self.scale)
+        self.buffer = wx.Bitmap(self.width * self.scale + self.margin * 2, self.height * self.scale + self.margin * 2)
         self.dc = wx.MemoryDC()
         self.dc.SelectObject(self.buffer)
         self.canvas = wx.GraphicsContext.Create(self.dc)
@@ -197,8 +199,10 @@ class EmbroiderySimulator(wx.Frame):
         self.segments = new_segments
 
     def calculate_dimensions(self):
-        width = 0
-        height = 0
+        # 0.01 avoids a division by zero below for designs with no width or
+        # height (e.g. a straight vertical or horizontal line)
+        width = 0.01
+        height = 0.01
 
         for x, y in self.all_coordinates():
             width = max(width, x)
@@ -208,7 +212,7 @@ class EmbroiderySimulator(wx.Frame):
         self.height = height
         self.scale = min(float(self.max_width) / width, float(self.max_height) / height)
 
-        # make room for decorations and a bit of a margin
+        # make room for decorations and the margin
         self.scale *= 0.95
 
     def go(self):
@@ -247,7 +251,8 @@ class EmbroiderySimulator(wx.Frame):
         decorations_width = window_width - client_width
         decorations_height = window_height - client_height
 
-        self.SetSize((self.width * self.scale + decorations_width, self.height * self.scale + decorations_height))
+        self.SetSize((self.width * self.scale + decorations_width + self.margin * 2,
+                      self.height * self.scale + decorations_height + self.margin * 2))
 
         e.Skip()
 
@@ -259,10 +264,6 @@ class EmbroiderySimulator(wx.Frame):
             dc.DrawLine(self.last_pos[0] - 10, self.last_pos[1],      self.last_pos[0] + 10, self.last_pos[1])
             dc.DrawLine(self.last_pos[0],      self.last_pos[1] - 10, self.last_pos[0],      self.last_pos[1] + 10)
 
-    def redraw(self):
-        dc = wx.ClientDC(self)
-        dc.DrawBitmap(self.buffer, 0, 0)
-
     def draw_one_frame(self):
         for i in xrange(self.stitches_per_frame):
             try:
@@ -272,10 +273,10 @@ class EmbroiderySimulator(wx.Frame):
                     y1 = self.height - y1
                     y2 = self.height - y2
 
-                x1 = x1 * self.scale
-                y1 = y1 * self.scale
-                x2 = x2 * self.scale
-                y2 = y2 * self.scale
+                x1 = x1 * self.scale + self.margin
+                y1 = y1 * self.scale + self.margin
+                x2 = x2 * self.scale + self.margin
+                y2 = y2 * self.scale + self.margin
 
                 self.canvas.SetPen(color)
                 self.canvas.DrawLines(((x1, y1), (x2, y2)))