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draw hover snap point

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This commit is contained in:
Josh Holtrop 2011-07-27 23:57:32 -04:00
parent a0fe5aa6aa
commit 6c91677c11
1 changed files with 42 additions and 1 deletions
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43
SketchWidget.py
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@ -24,7 +24,7 @@ class SketchWidget:
'arrow': gtk.gdk.Cursor(gtk.gdk.ARROW),
'crosshair': gtk.gdk.Cursor(gtk.gdk.CROSSHAIR),
}
self.current_snap_point = None
self.hover_snap_point = None
# Configuration parameters
self.line_width = 1.5
@ -34,6 +34,7 @@ class SketchWidget:
self.background_color = (0.0, 0.05, 0.1, 1.0)
self.line_color = (0.1, 0.6, 1.0, 1.0)
self.axis_color = (1.0, 0.0, 0.0, 1.0)
self.hover_color = (1.0, 1.0, 1.0, 1.0)
self.constraint_color = (0.8, 1.0, 0.0, 1.0)
self.snap_angle = 10
self.hv_snap_dist = 10
@ -132,6 +133,11 @@ class SketchWidget:
for c in self.drawingConstraints:
self.drawConstraint(c)
if self.hover_snap_point is not None:
glColor(*self.hover_color)
s, p = self.hover_snap_point
self.drawConnect(Connect(s, p, s, p))
if gldrawable.is_double_buffered():
gldrawable.swap_buffers()
else:
@ -408,6 +414,8 @@ class SketchWidget:
self.drawingConstraints = []
self.drawingShape.setPt(1, this_pt)
self.queue_redraw()
sp = self.get_closest_snap_point(x, y)
self.update_hover_snap_point(sp)
def do_circle_left_click(self, x, y):
pt = self.screenPtToPt((x, self.size[1] - y))
@ -428,10 +436,14 @@ class SketchWidget:
r = self.dist_bw(self.drawingShape.getPt(0), pt)
self.drawingShape.setRadius(r)
self.queue_redraw()
else:
sp = self.get_closest_snap_point(x, y)
self.update_hover_snap_point(sp)
def cancel_drawing_shape(self):
self.drawingShape = None
self.drawingConstraints = []
self.hover_snap_point = None
def merge_in_drawing_shape(self):
self.sketch.shapes.append(self.drawingShape)
@ -445,6 +457,11 @@ class SketchWidget:
y = pt2[1] - pt1[1]
return math.sqrt(x * x + y * y)
def dist2_bw(self, pt1, pt2):
x = pt2[0] - pt1[0]
y = pt2[1] - pt1[1]
return x * x + y * y
def update_snap_points(self):
self.snap_points = {}
for s in self.sketch.shapes:
@ -454,3 +471,27 @@ class SketchWidget:
for i in range(shape.nPts()):
pt = self.ptToScreenPt(shape.getPt(i))
self.snap_points[(shape, i)] = pt
def get_closest_snap_point(self, x, y):
closest_point = None
closest_dist = self.snap_dist * self.snap_dist * 2
for p in self.snap_points:
shape, ptNum = p
pt = self.ptToScreenPt(shape.getPt(ptNum))
dist = self.dist2_bw((x, self.size[1] - y), pt)
if dist < closest_dist:
closest_dist = dist
closest_point = p
if closest_dist <= self.snap_dist * self.snap_dist:
return closest_point
return None
def update_hover_snap_point(self, sp):
if sp is not None:
if sp != self.hover_snap_point:
self.hover_snap_point = sp
self.queue_redraw()
else:
if self.hover_snap_point is not None:
self.hover_snap_point = None
self.queue_redraw()