I'm trying to create a chart somewhat along the lines of the Multi-Line Tooltip example, but I'd like to format the string that is being printed to have some text added at the end. I'm trying to modify this part:
# Draw text labels near the points, and highlight based on selection
text = line.mark_text(align='left', dx=5, dy=-5).encode(
text=alt.condition(nearest, 'y:Q', alt.value(' '))
)
Specifically, rather than 'y:Q' I want something along the lines of 'y:Q' + " suffix". I've tried doing something like this:
# Draw text labels near the points, and highlight based on selection
text = line.mark_text(align='left', dx=5, dy=-5).encode(
text=alt.condition(nearest, 'y:Q', alt.value(' '), format=".2f inches")
)
Alternatively, I've tried:
# Draw text labels near the points, and highlight based on selection
y_fld = 'y'
text = line.mark_text(align='left', dx=5, dy=-5).encode(
text=alt.condition(nearest, f"{y_fld:.2f} inches", alt.value(' '))
)
I think I see why those don't work, but I can't figure out how to intercept the value of y and pass it through a format string. Thanks!
I think the easiest way to do this is to calculate a new field using transform_calculate to compute the label that you want.
Using the example from the documentation, I would change the text chart like this:
text = line.mark_text(align='left', dx=5, dy=-5).encode(
text=alt.condition(nearest, 'label:N', alt.value(' '))
).transform_calculate(label='datum.y + " inches"')
That leads to this chart:
If you want more control, you could change the dataset with pandas beforhand. Be sure to set the type to Nominal (and not Quantitative) otherwise you would get NaNs in the tooltips.
Related
Just like we can highlight point(s) in one of the charts of a concatenated chart or a faceted chart and the corresponding point(s) will also get highlighted in the other chart, I was wondering if the same can be done with a tooltip.
I have been able to come up with a demo using mark_text as you can see below. But the biggest challenge is not being able to show multiple encodings as text. Tooltips make that really easy by just mentioning all the encodings in a list. So I was thinking if there is a way to do that in Altair.
Or is this not the expected behavior of Tooltips, and they are ONLY supposed to highlight the point over which the mouse is hovering even if other charts may have a common selection?
Whatever I have tried with Tooltips only works in a single chart, the other point despite being highlighted does not also show a tooltip.
Code:
import altair as alt
from vega_datasets import data
source = data.cars()
highlight = alt.selection(type='single', on="mouseover", empty='none')
base = alt.Chart(source).encode(
y='Miles_per_Gallon',
color=alt.condition(highlight, 'Origin', alt.ColorValue('gray')),
)
mpg = base.mark_point().encode(
x='Horsepower',
size=alt.condition(highlight, alt.value(150), alt.value(50))).add_selection(
highlight
)
acc = base.mark_point().encode(
x='Acceleration',
size=alt.condition(highlight, alt.value(150), alt.value(50))).add_selection(
highlight
)
text_mpg = base.mark_text(dx=5, dy=-10, size=15).encode(
x='Horsepower',
y='Miles_per_Gallon',
text=alt.condition(highlight, 'Horsepower:Q', alt.value('')),
)
text_acc = base.mark_text(dx=5, dy=-10, size=15).encode(
x='Acceleration',
y='Miles_per_Gallon',
text=alt.condition(highlight, 'Acceleration:Q', alt.value('')),
)
(mpg+text_mpg)|(acc+text_acc)
Demo:
Expected Output:
Show tooltips instead of text, with multiple encodings
I am however starting to feel that this is not the intended behavior of tooltip.
I got a problem with changing the height of the Treeview.heading. I have found some answers about the dimensions of Treeview.column, but when I access Treeview.heading in the documentation, there is not a single word about changing the height of the heading dynamically when the text doesn't fit (and wrapping it) or even just hard-coding height of the heading in pixels.
I don't have to split the text to two rows, but when I just keep it that long the whole table (as it has many entries) takes up the whole screen. I want to keep it smaller, therefore I need to split longer entries.
Here is how it looks like:
I can't find any documentation to verify this but it looks like the height of the heading is determined by the heading in the first column.
Reproducing the problem
col_list = ('Name', 'Three\nLine\nHeader', 'Two\nline')
tree = Treeview(parent, columns=col_list[1:])
ix = -1
for col in col_list:
ix += 1
tree.heading(f'#{ix}', text=col)
The fix
col_list = ('Name\n\n', 'Three\nLine\nHeader', 'Two\nline')
or, if you want to make it look prettier
col_list = ('\nName\n', 'Three\nLine\nHeader', 'Two\nline')
The only problem is I haven't figured out how to centre the heading on a two line header
Edit
The newlines work if it is the top level window but not if it is a dialog. Another way of doing this is to set the style. I've got no idea why this works.
style = ttk.Style()
style.configure('Treeview.Heading', foreground='black')
you can use font size to increase the header height for sometimes;
style = ttk.Style()
style.configure('Treeview.Heading', foreground='black', background='white', font=('Arial',25),)
I need to plot line plot that has different colors. I create special df column 'color' that contains for each point appropriate color.
I already found the solution here:
python/matplotlib - multicolor line
And take the approach from the above question. First, it was working when I use index but now I need to plot it vs other column and I can not appropriately handle the colors. It is all the time colores only with one color.
I use this code for setting colors, but it color line with one color that is the last in the column 'color'. And also create a legend that I don't understand how to delete from the plot.
for color2, start, end in gen_repeating(df2['color']):
print(start, end)
if start > 0: # make sure lines connect
start -= 1
idx = df2.index[start:end+1]
x2 = idx
y2 = df2.loc[idx, 'age_gps_data'].tolist()
df2.plot(x='river_km', y='age_gps_data', color=color2, ax=ax[1])
ax[1].xaxis.set_major_locator(plt.MaxNLocator(5))
plt.setp(ax[1].get_xticklabels())
I would appreciate any help.
How can I set these colors to achieve different color in one line? And don't have legend on the plot.
My task is a variation of a multiple object tracking task. There are 7 circles on the screen. It randomly selects 3 circles to change the color (red, green, blue) briefly to indicate to the participant to track these circles. After the color change, all the circles will change to the same color and the circles will move for a period of time. When the circles stop moving, a response prompt will appear, where the participant is to select one of the three colored circles ('select the red/green/blue circle'). I am having difficulty inserting which color circle to select into the formatted string. I keep getting the error message: unsupported operand type(s) for %: 'TextStim' and 'list'
I'm not sure if I need to or how to convert these lists, so any help would be much appreciated!
n_targets = 7 #seven locations
circles = [] #setting up the circle stimuli
for i in range(n_targets):
tmp = visual.Circle(win,radius = 27,units = 'pix',edges = 32,fillColor='white',lineColor = 'black',lineWidth = 1, pos=(posx[i],posy[i]))
circles.append(tmp)
cols = ['blue','red','green'] #3 colors the circles will change to
targets = random.sample(circles,3) #randomly select 3 of the 7 circles
TrialTarget = random.sample(targets, 1) #select 1 of the 3 circles to be the target for the trial
#code for movement would go here (skipping since it is not relevant)
#at end of trial, response prompt appears and ask user to select target and is where error occurs
ResponsePrompt = visual.TextStim(win, text = "Select the %s circle") %TrialTarget
In this line, you are trying to create a formatted string from a TextStim object and a Circle stimulus object rather than a string object and another string object:
ResponsePrompt = visual.TextStim(win, text = "Select the %s circle") %TrialTarget
i.e. ResponsePrompt is clearly a visual.TextStim, as you are creating it as one, and I think TrialTarget is a visual.Circle stimulus, as you randomly sample it from a list of Circles.
I'm guessing that you actually want to incorporate the colour label into the prompt text. So to fix both problems (the type incompatibility and the formatting syntax), you need to actually get one of the elements of cols, called say trialColour, and use something like this:
ResponsePrompt = visual.TextStim(win, text = "Select the %s circle" % trialColour)
i.e. here trialColour is actually a string, and the formatting operation is brought inside the brackets so it applies directly to the text string "Select the %s circle"
That should hopefully fix your immediate problem. You might also want to investigate using random.shuffle() to shuffle lists in place instead of random.sample().
I am running the following command to draw a few X,Y points in gnuplot:
plot "Output.tsv" using ($2+3):($3+3):1 with labels, "Output.tsv" using 2:3
Some of the data points are very close to each other and it makes the label unreadable. Is there a way to ask gnuplot to eliminate/reduce the overlap between labels?
I think you could consider 3 options:
1) make your graph huge and hope your labels do not overlap
2) plot the points as different series with each item having its own legend
3) use letters instead of labels, you can put a letter at each point using
plot "???" using 1:2
plot "" using 1:2:(stringcolumn(3) ne 'compare to' ? 'if equal' : 'if not equal' ) with labels
the stringcolumn function looks in column 3, compares the value to the string 'compareto' and if there is a match it puts 'if equal' at that location, otherwise 'if not equal'
Hence, I see something like Simulator in your graph, you could keep the green point and put an S with it/on it using
plot "" using 1:2:(stringcolumn(3) ne 'Simulator' ? 'S' : '' ) with labels
I hope this helps.