bar widget, are regions possible?
10 Feb 2014 21:46 - 10 Feb 2014 21:48 #43702
by ArcEye
There is now.
Because there is no dial and needle, it does not make much sense to have a coloured scale, but the colour of the bar itself can be changed to reflect its state.
Comment out the original class pyvcp_bar in pyvcp_widgets.py
Then insert this code
The revised widget takes 3 range definitions (you must use all 3 or none will be used, if you just want 2, set 2 of them to the same colour)
If these are set the bar colour will change depending upon the value of the pin
xml file snippet
postgui hal file snippet
and results
bar changes colour with increase in value within the ranges set
regards
Replied by ArcEye on topic bar widget, are regions possible?
I did my first attempt at a pyvcp panel today with pretty good success. I did a spindle load meter and it works nicely. I used the bar widget for the display but would really like to have green yellow red regions/ zones on the bar. I seen that the meter widget allows setting of regions like this but could not find any info on doing similar with a bar.
Is there any way of doing regions like this on a pyvcp bar?
There is now.
Because there is no dial and needle, it does not make much sense to have a coloured scale, but the colour of the bar itself can be changed to reflect its state.
Comment out the original class pyvcp_bar in pyvcp_widgets.py
Then insert this code
class pyvcp_bar(Canvas):
## reworked by ArcEye 10022014
## choice to have value ranges in different colours
""" (indicator) a bar-indicator for a float
<bar>
<halpin>"my-bar"</halpin>
<min_>0</min_>
<max_>150</max_>
<bgcolor>"grey"</bgcolor>
<range1>(0,80,"green")</range1>
<range2>(80,100,"orange")</range2>
<range3>(100,123,"red")</range3>
<fillcolor>"green"</fillcolor>
</bar>
"""
n=0
def __init__(self,master,pycomp,fillcolor="green",bgcolor="grey",
halpin=None,min_=0.0,max_=100.0,range1=None,range2=None,range3=None,**kw):
self.cw=200 # canvas width
self.ch=50 # canvas height
self.bh=30 # bar height
self.bw=150 # bar width
self.pad=((self.cw-self.bw)/2)
Canvas.__init__(self,master,width=self.cw,height=self.ch)
if halpin == None:
halpin = "bar."+str(pyvcp_bar.n)
pyvcp_bar.n += 1
self.halpin=halpin
self.endval=max_
self.startval=min_
pycomp.newpin(halpin, HAL_FLOAT, HAL_IN)
self.value=0.0 # some dummy value to start with
pycomp[self.halpin] = self.value
# the border
border=self.create_rectangle(self.pad,1,self.pad+self.bw,self.bh)
self.itemconfig(border,fill=bgcolor)
# the bar
tmp=self.bar_coords()
start=tmp[0]
end=tmp[1]
self.bar=self.create_rectangle(start,2,end,self.bh-1)
# default fill unless overriden
self.itemconfig(self.bar,fill=fillcolor)
# start text
start_text=self.create_text(self.pad,self.bh+10,text=str(self.startval) )
#end text
end_text=self.create_text(self.pad+self.bw,self.bh+10,text=str(self.endval) )
# value text
self.val_text=self.create_text(self.pad+self.bw/2,
self.bh/2,text=str(self.value) )
if range1!=None:
self.range1 = range1
if range2!=None:
self.range2 = range2
if range3!=None:
self.range3 = range3
def set_fill(self, (start1, end1, color1),(start2, end2, color2), (start3, end3, color3)):
if self.value:
if (self.value > start1) and (self.value <= end1):
self.itemconfig(self.bar,fill=color1)
else:
if (self.value > start2) and (self.value <= end2):
self.itemconfig(self.bar,fill=color2)
else:
if (self.value > start3) and (self.value <= end3):
self.itemconfig(self.bar,fill=color3)
def bar_coords(self):
""" calculates the coordinates in pixels for the bar """
# the bar should start at value = zero
# and extend to value = self.value
# it should not extend beyond the initial box reserved for the bar
min_pixels=self.pad
max_pixels=self.pad+self.bw
bar_end = min_pixels + ((float)(max_pixels-min_pixels)/(float)(self.endval-self.startval)) * (self.value-self.startval)
if bar_end>max_pixels:
bar_end = max_pixels
elif bar_end < min_pixels:
bar_end = min_pixels
bar_start = min_pixels + ((float)(max_pixels-min_pixels)/(float)(self.endval-self.startval)) * (0-self.startval)
if bar_start < min_pixels: # don't know if this is really needed
bar_start = min_pixels
return [bar_start, bar_end]
def update(self,pycomp):
# update value
newvalue=pycomp[self.halpin]
if newvalue != self.value:
self.value = newvalue
valtext = str( "%(b)3.1f" % {'b':self.value} )
self.itemconfig(self.val_text,text=valtext)
# set bar colour
if self.range1 and self.range2 and self.range3:
self.set_fill(self.range1, self.range2, self.range3)
# set bar size
tmp=self.bar_coords()
start=tmp[0]
end=tmp[1]
self.coords(self.bar, start, 2,
end, self.bh-1)
# -------------------------------------------The revised widget takes 3 range definitions (you must use all 3 or none will be used, if you just want 2, set 2 of them to the same colour)
If these are set the bar colour will change depending upon the value of the pin
xml file snippet
<pyvcp>
<hbox>
<bar>
<halpin>"my-bar"</halpin>
<min_>0</min_>
<max_>150</max_>
<bgcolor>"grey"</bgcolor>
<range1>(0,100,"green")</range1>
<range2>(100,130,"orange")</range2>
<range3>(130,150,"red")</range3>
</bar>
</hbox>
<hbox>
<scale>
<font>("Helvetica",16)</font>
<width>"25"</width>
<halpin>"my-hscale"</halpin>
<resolution>1</resolution>
<orient>HORIZONTAL</orient>
<initval>0</initval>
<min_>0</min_>
<max_>150</max_>
</scale>
</hbox>
</pyvcp>postgui hal file snippet
net bar1 pyvcp.my-bar <= pyvcp.my-hscale-fand results
bar changes colour with increase in value within the ranges set
regards
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