I want to create a marker, to make the value projection, but only to the bar of the current month.
To draw shapes on certain values, you can try annotations. Using yaxis.annotations, you will be able to draw text as well as a shape on y-values.
A complete example of how to use annotations can be found here
Related
I'm currently developing a Qt desktop application using the Q3DScatter class. I'm inspecting Qt's 3D Scatter example project and I tried to modify the data item set to plot my own data. The data is plotted except that one axis is not well scaled and my 3D plot looks really messy. I'm looking for a way to adjust this axis. I've tried to change the range and the segment count of the axis, I even tried to set the "AutoAdjustRange" of the axis to true, but nothing seemed to solve the problem.
Would really appreciate some help.
PS: Here's a screen capture of what my 3D scatter graph looks like (the "messy" axis is shown with the red arrow)
I figured this out by creating a CustomFormatter class by subclassing QValue3DAxisFormatter and reimplementing some of its functions (I followed this tutorial). Then I set up my axis formatter to my custom formatter (m_graph->axisZ()->setFormatter(cf);).
Subclassing QValue3DAxisFormatter will not work: it determines where ticks and labels are placed, but not how large the axex actually are.
To do that, you can set the (horizontal) aspect ratio, that is a property of Q3DScatter. The following settings will make the data into a cube volume:
plot->setAspectRatio(1.0);
plot->setHorizontalAspectRatio(1.0);
In v2.0-beta, is there a way to configure the tooltip corresponding to that x-position to show up when hovering anywhere above that point on the axis? for example, the functionality shown here:
https://blockchain.info/charts/market-price
As you trace the line horizontally, you are shown the tooltip corresponding with your distance from the y-axis.
What the tooltip shows in your example is the y value corresponding to the distance from the y-axis (i.e. the x value).
Unless you want to extrapolate between data points (not usually a good idea for data like that shown in your example, since you don't know that its going to follow your extrapolation), this means that you need to have data values for all points where you want to show the tooltip.
With that your question is basically about showing every n x axis labels. https://stackoverflow.com/a/31606933/360067 does this similar for the current stable version of Chart.js. For v2.0-alpha, the option you need to be adjusting is scales.xAxes.labels.template.
Each red circle in this map is a point but due to the density of them, there isn't enough space to show the text labels for all of them. So I want to filter them down to just show those which can show a text label.
How can I do this? marker-spacing seemed to be promising but makes no difference. I see no "marker-min-distance" as there is with "text-min-distance".
Basically there's no point in showing a marker at all if it can't be identified with text. This is for a non-interactive offline map.
There is marker-spacing.
If you want to draw only labelled markers, use shields instead (answered here).
I'm creating a simulator coded in python and based on ODE (Open Dynamics Engine). For visualization I chose VTK.
For every object in the simulation, I create a corresponding source (e.g. vtkCubeSource), mapper and actor. I am able to show objects correctly and update them as the simulation runs.
I want to add axes to have a point of reference and to show the direction of each axis. Doing that I realized that, by default, X and Z are in the plane of the screen and Y points outwards. In my program I have a different convention.
I've been able to display axes in 2 ways:
1) Image
axes = vtk.vtkAxes()
axesMapper = vtk.vtkPolyDataMapper()
axesMapper.SetInputConnection(axes.GetOutputPort())
axesActor = vtk.vtkActor()
axesActor.SetMapper(axesMapper)
axesActor.GetProperty().SetLineWidth(4)
2) Image (colors do not match with the first case)
axesActor = vtk.vtkAxesActor()
axesActor.AxisLabelsOn()
axesActor.SetShaftTypeToCylinder()
axesActor.SetCylinderRadius(0.05)
In the second one, the user is allowed to set many parameters related to how the axis are displayed. In the first one, I only managed to set the line width but nothing else.
So, my questions are:
Which is the correct way to define and display axes in a 3D scene? I just want them in a fixed position and orientation.
How can I set a different convention for the axes orientation, both for their display and the general visualization?
Well, if you do not mess with objects' transformation matrix for display
purposes, it could probably be sufficient to just put your camera into a
different position while using axes approach 2. The easy methods to adjust
your camera position are: Pitch(), Azimuth() and Roll().
If you mess with object transforms, then apply the same transform to the
axes.
Dženan Zukić kindly answered this question in vtkusers#vtk.org mail list.
http://www.vtk.org/pipermail/vtkusers/2011-November/119990.html
I would like to display multiple colors (and potentially shapes and sizes) of data points in a Google Chart scatter chart. Does anyone have an example of how to do so?
I answered my own question after waiting SECONDS for an answer here :-)
You can indeed have different colors for different data elements. For example:
http://chart.apis.google.com/chart?chs=300x200&cht=s&chd=t:1,2,3|6,5,4&chds=1,3,0,10&chxt=x,y&chxl=0:|0|1|2|1:|0|10&chm=d,ff0000,0,0,8,0|a,ff8080,0,1,42,0|c,ffff00,0,2,16,0
It's the chm= that does the magic. I was trying to have multiple chm= statements. You need to have just one, but with multiple descriptions separated by vertical bars.
You can only use one dataset in a scatter plot, thus only one color.
http://code.google.com/apis/chart/#scatter_plot
From the API description:
Scatter plots use multiple data sets differently than other chart types. You can only show one data set in a scatter plot.
You could effectively fake a multi-color scatter plot by using a line plot with white lines and colored shape markers at the points you want to display.
Here's another example: twitter charts. I'm hoping to do the same thing. Need to find out how to do the concentric circles.