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  • LWJGL glRotatef() without rotating axes?

    - by Brandon oubiub
    Okay so, I noticed when you rotate around an axis, say you do this: glRotatef(90.0f, 1.0f, 0.0f, 0.0f); That will rotate things 90 degrees around the x-axis. However, it also sort of rotates the y and z axes as well. So now the y-axis is pointing in and out of the screen, instead of up and down. So when I try to do stuff like this: glRotatef(90.0f, 1.0f, 0.0f, 0.0f); glRotatef(whatever, 0.0f, 1.0f, 0.0f); glRotatef(whatever2, 0.0f, 0.0f, 1.0f); The rotations around the y and z-axes end up not how I want them. I was wondering if there is any way I can sort of rotate just the axes back to their initial position after using glRotatef(), without rotating the object back. Or something like that, just so that when I rotate around the y-axis, it rotates around a vertical axis.

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  • How can I link axes of imshow plots for zooming and panning?

    - by Adam Fraser
    Suppose I have a figure canvas with 3 plots... 2 are images of the same dimensions plotted with imshow, and the other is some other kind of subplot. I'd like to be able to link the x and y axes of the imshow plots so that when I zoom in one (using the zoom tool provided by the NavigationToolbar), the other zooms to the same coordinates, and when I pan in one, the other pans as well. Subplot methods such as scatter and histogram can be passed kwargs specifying an axes for sharex and sharey, but imshow has no such configuration. I started hacking my way around this by subclassing NavigationToolbar2WxAgg (shown below)... but there are several problems here. 1) This will link the axes of all plots in a canvas since all I've done is get rid of the checks for a.in_axes() 2) This worked well for panning, but zooming caused all subplots to zoom from the same global point, rather than from the same point in each of their respective axes. Can anyone suggest a workaround? Much thanks! -Adam from matplotlib.backends.backend_wxagg import NavigationToolbar2WxAgg class MyNavToolbar(NavigationToolbar2WxAgg): def __init__(self, canvas, cpfig): NavigationToolbar2WxAgg.__init__(self, canvas) # overrided # As mentioned in the code below, the only difference here from overridden # method is that this one doesn't check a.in_axes(event) when deciding which # axes to start the pan in... def press_pan(self, event): 'the press mouse button in pan/zoom mode callback' if event.button == 1: self._button_pressed=1 elif event.button == 3: self._button_pressed=3 else: self._button_pressed=None return x, y = event.x, event.y # push the current view to define home if stack is empty if self._views.empty(): self.push_current() self._xypress=[] for i, a in enumerate(self.canvas.figure.get_axes()): # only difference from overridden method is that this one doesn't # check a.in_axes(event) if x is not None and y is not None and a.get_navigate(): a.start_pan(x, y, event.button) self._xypress.append((a, i)) self.canvas.mpl_disconnect(self._idDrag) self._idDrag=self.canvas.mpl_connect('motion_notify_event', self.drag_pan) # overrided def press_zoom(self, event): 'the press mouse button in zoom to rect mode callback' if event.button == 1: self._button_pressed=1 elif event.button == 3: self._button_pressed=3 else: self._button_pressed=None return x, y = event.x, event.y # push the current view to define home if stack is empty if self._views.empty(): self.push_current() self._xypress=[] for i, a in enumerate(self.canvas.figure.get_axes()): # only difference from overridden method is that this one doesn't # check a.in_axes(event) if x is not None and y is not None and a.get_navigate() and a.can_zoom(): self._xypress.append(( x, y, a, i, a.viewLim.frozen(), a.transData.frozen())) self.press(event)

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  • Rotate sphere in Javascript / three.js while moving on x/z axes

    - by kaipr
    I have a sphere/ball in three.js which I want to "roll" arround on a x/z axis. For the z axe I could simply do this no matter what the current x and y rotation is: sphere.roll_z = function(distance) { sphere.position.z += distance; sphere.rotation.x += distance > 0 ? 0.05 : -0.05; } But how can I roll it along the x axe? And how could I properly do the roll_z? I've found a lot about quateration and matrixes, but I can't figure out how to use them properly to achieve my (rather simple) goal. I'm aware that I have to update multiple rotations and that I have to calculate how far to rotate the sphere to match the distance, but the "how" is the question. It's probably just lack of mathematical skills which I should train, but a working example/short explanation would help alot to start with.

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  • Correlating traditional Windows joystick axes with HID

    - by Wade Williams
    I'm a bit confused on the description of joystick axes and I'm hoping that someone has a link or document which could help clear my confusion. I'm not a Windows guy, so trying to port some traditional Windows gameport code has me a bit confused. We all know about the common first three axes: X Y Z My understanding was that in the gameport-style interface the three other axes are: R U V However, looking in my IOHIDUsageTables (OS X), I see: kHIDUsage_GD_X = 0x30, /* Dynamic Value */ kHIDUsage_GD_Y = 0x31, /* Dynamic Value */ kHIDUsage_GD_Z = 0x32, /* Dynamic Value */ kHIDUsage_GD_Rx = 0x33, /* Dynamic Value */ kHIDUsage_GD_Ry = 0x34, /* Dynamic Value */ kHIDUsage_GD_Rz = 0x35, /* Dynamic Value */ kHIDUsage_GD_Vx = 0x40, /* Dynamic Value */ kHIDUsage_GD_Vy = 0x41, /* Dynamic Value */ kHIDUsage_GD_Vz = 0x42, /* Dynamic Value */ kHIDUsage_GD_Vbrx = 0x43, /* Dynamic Value */ kHIDUsage_GD_Vbry = 0x44, /* Dynamic Value */ kHIDUsage_GD_Vbrz = 0x45, /* Dynamic Value */ kHIDUsage_GD_Vno = 0x46, /* Dynamic Value */ This has me a bit confused due to the three R axis (though that does not appear to be uncommon) and the lack of a U axis. Two questions: 1) Can anyone confirm to what axis the traditional U axis would be? I saw one document describe it as "the axis for rudder pedals" leading me to believe it would be Rz. 2) Can anyone describe in more detail the typical usages of the V and Vbr axes? I understand the descriptions are "vector" and "relative vector,' respectively, but I'm having difficult visualizing what that means in terms of a physical device. All enlightenment and documentation pointers welcome.

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  • Updating GUI axes in MATLAB

    - by James
    HI, I am making a GUI for a program I have created, where I need to be able to change the position of a load along a beam. I have set up the axes and the slider properly, but I am unsure how to get the axes to update, as I can't find any examples that show how to do this on the internet. At present, as I move the load, the position updates properly, but the old position stays on screen as well, which is quite annoying. Can anyone recommend any good examples that show how to do this, or does anyone have a suggestion of how to go about refreshing the axes? Regards, James

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  • Edit axes to an image in matlab ?

    - by ZaZu
    Hello, I would like to edit the axes in my series of images being displayed .. This is how my image looks like : As you can see, it starts from 0 to ~~500 from top to bottom, can I invert that ? Plus I want to mirror the image being shown, so that it starts from left to right ... Or if its possible, let the axes show from right to left ? Thanks !

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  • Using the full width of an Excel chart with two Y-axes

    - by Jørn Schou-Rode
    I am trying to create a line chart in MicrosoftExcel 2007 with two data series, each with their own Y-axis. First, I create a simple chart by selecting the two data series, and choosing Insert > Charts > Line from the Ribbon. I now see the following chart in my workbook: I then continue my quest by right clicking one of the data series (lines) and choosing Format data series > Series Options > Secondary Axis. My chart is now looks like this: This is almost what I want. I did not expect to see the gap between the last X-axis tick point (x = 5) and the secondary (right most) Y-axis. Why does Excel introduce this gap? Is there anything I can do to avoid it? I have tried right clicking the X-axis and seleting Format Axis > Axis Options > Position Axis: Between tick marks, but that only introduces a similar gap on by the primary (left most) Y-axis.

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  • JSCharts - How to Hide Axes

    - by st4ck0v3rfl0w
    Hello All, I'm currently using JSCharts to chart some data, however, I'm not quite sure how to hide the axes. Maybe I'm overlooking something in the reference documentation (see http://www.jscharts.com/how-to-use-reference) but I can't seem to find it!~ myChart.setAxisWidth(0); //works in Firefox but not Chrome Thanks in advance!

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  • Plotting two axes in gnuplot

    - by ldigas
    Is it possible to plot two curves, with two corresponding axes in gnuplot, each of which has a different scale. For example, y=x*2. and y=x*4. in the same graph (they vary enough for them to be "uncomfortable" placed with the same scale) ?

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  • WPF MVVM Chart change axes

    - by c0uchm0nster
    I'm new to WPF and MVVM. I'm struggling to determine the best way to change the view of a chart. That is, initially a chart might have the axes: X - ID, Y - Length, and then after the user changes the view (either via lisbox, radiobutton, etc) the chart would display the information: X - Length, Y - ID, and after a third change by the user it might display new content: X - ID, Y - Quality. My initial thought was that the best way to do this would be to change the bindings themselves. But I don't know how tell a control in XAML to bind using a Binding object in the ViewModel, or whether it's safe to change that binding in runtime? Then I thought maybe I could just have a generic Model that has members X and Y and populate them as needed in the viewmodel? My last thought was that I could have 3 different chart controls and just hide and show them as appropriate. What is the CORRECT/SUGGESTED way to do this in the MVVM pattern? Any code examples would be greatly appreciated. Thanks

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  • 2D Platformer Collision Problems With Both Axes

    - by AusGat
    I'm working on a little 2D platformer/fighting game with C++ and SDL, and I'm having quite a bit of trouble with the collision detection. The levels are made up of an array of tiles, and I use a for loop to go through each one (I know it may not be the best way to do it, and I may need help with that too). For each side of the character, I move it one pixel in that direction and check for a collision (I also check to see if the character is moving in that direction). If there is a collision, I set the velocity to 0 and move the player to the edge of the tile. My problem is that if I check for horizontal collisions first, and the player moves vertically at more than one pixel per frame, it handles the horizontal collision and moves the character to the side of the tile even if the tile is below (or above) the character. If I handle vertical collision first, it does the same, except it does it for the horizontal axis. How can I handle collisions on both axes without having those problems? Is there any better way to handle collision than how I'm doing it?

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  • Missing z-axis rotation for transforming between two vectors

    - by Steve Baughman
    I'm trying to rotate a cube so that it's facing up, but am getting hung up on the final implementation details. It now reliably will rotate the x,y axis to the correct side, but the z-axis is never rotating (See photos of before and after rotation). When I'm using the code below I always get '0' for my rotationVector.z. What am I missing here? // Define lookAt vector lookAtVector = GLKVector3Make(0,0,1); // Define axes vectors axes[0] = GLKVector3Make(0,0,1); axes[1] = GLKVector3Make(-1,0,0); axes[2] = GLKVector3Make(0,1,0); axes[3] = GLKVector3Make(1,0,0); axes[4] = GLKVector3Make(0,-1,0); axes[5] = GLKVector3Make(0,0,-1); CGFloat highest_dot = -1.0; GLKVector3 closest_axis; for(int i = 0; i < 6; i++) { // multiply cube's axes by existing matrix GLKVector3 axis = GLKMatrix4MultiplyVector3(matrix, axes[i]); CGFloat dot = GLKVector3DotProduct(axis, lookAtVector); if(dot > highest_dot) { closest_axis = axis; highest_dot = dot; } } GLKVector3 rotationVector = GLKVector3CrossProduct(closest_axis, lookAtVector); // Get angle between vectors CGFloat angle = atan2(GLKVector3Length(rotationVector), GLKVector3DotProduct(closest_axis, lookAtVector)); // normalize the rotation vector rotationVector = GLKVector3Normalize(rotationVector); // Create transform CATransform3D rotationTransform = CATransform3DMakeRotation(angle, rotationVector.x, rotationVector.y, rotationVector.z); // add rotation transform to existing transformation baseTransform = CATransform3DConcat(baseTransform, rotationTransform); return baseTransform; Before 3d Rotation After 3d Rotation Implementation based on this post

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  • CSS: Freeze table header and first column, *but only on certain axes*

    - by Mega Matt
    Hello all, I have a variation on a common question, and I'll try to explain it as best I can. It may take some visualization on your part. I have an HTML table (in reality there are tables within tables within divs within tables -- I'm using the JSGantt plugin). I'd like for the table header to be frozen only when I scroll down on the y-axis, but if I need to scroll right to see more data, I would like it to scroll right. Meanwhile, as I scroll down (with the header row staying put), I'd like the first column of the table to scroll down with me. But when I scroll right, I want the first column to stay put (but as I mentioned above, the header row to scroll with me). So essentially I've frozen the first column only on the x-axis and the header row only on the y-axis. I'll stop there for now. If anyone needs more clarification I can try to explain. I've tried this multiple ways, but I'm convinced that it may not be possible without some serious javascript. The table, by the way, is contained within an outer div with set dimensions, hence the need for me to scroll the data. Any help you can provide would be greatly appeciated. Thanks very much.

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  • How can I reorient the axes of an object?

    - by d3vid
    I spent some time in Unity yesterday trying to fire a sphere from a horizontal cylinder (like a ball from a cannon). I was using Vector3.forward, but the sphere kept coming out the top of the cylinder rather than the front. Someone suggested using Vector3.up instead, and sure enough it worked! The cylinder is vertical by default. So, it appears that when I rotated the cylinder by 90 degrees to lay it flat, the local axes remained the same. The relative front of the cylinder remained at the same point, so when I fired the sphere it shot out the new "top", not what looked to me like the "front". If I had happened to be facing the other way, I would have had to fire at Vector3.down instead. How can I reorient/reset the axes of an object so that they match my expectations? (And if I can't, how can I tell by looking which way an object is oriented?)

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  • Stata - Multiple rotated plots on graph (including distributions on sides of axes)

    - by meerak
    I would like to produce a single graph containing both: (1) a scatter plot (2) either histograms or kernel density functions of the Y and X variables to the left of the Y axis and below the X axis. I found a graph that does this in MATLAB -- I would just like to produce something similar in Stata: That graph was produced using the following MATLAB code: n = 1000; rho = .7; Z = mvnrnd([0 0], [1 rho; rho 1], n); U = normcdf(Z); X = [gaminv(U(:,1),2,1) tinv(U(:,2),5)]; [n1,ctr1] = hist(X(:,1),20); [n2,ctr2] = hist(X(:,2),20); subplot(2,2,2); plot(X(:,1),X(:,2),'.'); axis([0 12 -8 8]); h1 = gca; title('1000 Simulated Dependent t and Gamma Values'); xlabel('X1 ~ Gamma(2,1)'); ylabel('X2 ~ t(5)'); subplot(2,2,4); bar(ctr1,-n1,1); axis([0 12 -max(n1)*1.1 0]); axis('off'); h2 = gca; subplot(2,2,1); barh(ctr2,-n2,1); axis([-max(n2)*1.1 0 -8 8]); axis('off'); h3 = gca; set(h1,'Position',[0.35 0.35 0.55 0.55]); set(h2,'Position',[.35 .1 .55 .15]); set(h3,'Position',[.1 .35 .15 .55]); colormap([.8 .8 1]); UPDATE: The Stata13 manual entry for "graph combine" has precisely this example (http://www.stata.com/manuals13/g-2graphcombine.pdf). Here is the code: use http://www.stata-press.com/data/r13/lifeexp, clear generate loggnp = log10(gnppc) label var loggnp "Log base 10 of GNP per capita" scatter lexp loggnp, ysca(alt) xsca(alt) xlabel(, grid gmax) fysize(25) saving(yx) twoway histogram lexp, fraction xsca(alt reverse) horiz fxsize(25) saving(hy) twoway histogram loggnp, fraction ysca(alt reverse) ylabel(,nogrid) xlabel(,grid gmax) saving(hx) graph combine hy.gph yx.gph hx.gph, hole(3) imargin(0 0 0 0) graphregion(margin(l=22 r=22)) title("Life expectancy at birth vs. GNP per capita") note("Source: 1998 data from The World Bank Group")

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  • Java2d: Translate the axes

    - by Algorist
    Hi, I am developing an application using Java2d. The weird thing I noticed is, the original is at the top left corner and x and y axis increases from there. Is there a way to move the origin bottom left? Thank you.

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  • matplotlib 3D plot with PyQt4 in Qtabwidget (mplwidget)

    - by artdijk
    I am working on my first Python app using PythonXY (2.6 and Qt4). I have a window with some buttons and a QtabWidget. When I press a button I want to plot a 3D image on a specific tab. I managed to get a 2D plot but I can't get the axes to 3D. Via Qt desiger I use the mplwidget. In many examples I see the use of figure(), but I can't get that to work with the mplwidget. (I am not sure if that is even possible) Can you please show me an example of code defining the 3D axes (in a QtabWidget) with a simple plot ? Thanks very much

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  • Sorting a 2D numpy array by multiple axes

    - by perimosocordiae
    I have a 2D numpy array of shape (N,2) which is holding N points (x and y coordinates). For example: array([[3, 2], [6, 2], [3, 6], [3, 4], [5, 3]]) I'd like to sort it such that my points are ordered by x-coordinate, and then by y in cases where the x coordinate is the same. So the array above should look like this: array([[3, 2], [3, 4], [3, 6], [5, 3], [6, 2]]) If this was a normal Python list, I would simply define a comparator to do what I want, but as far as I can tell, numpy's sort function doesn't accept user-defined comparators. Any ideas?

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  • Change axes of google chart without refresh?

    - by Mike Kriess
    If I was using the following: https://developers.google.com/chart/interactive/docs/gallery/annotatedtimeline Assuming I did not have the line: data.addColumn('number', 'Sold Pencils'); or anything referring to 'Sold Pencils'; How do I make it such that when the user clicks an external link 'Sold Pencils' I am able to retrieve the data and add it to the graph (without the user refreshing the page). Is there some way to redraw the graph/add the column in this way?

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  • scaling axes in Mathematica

    - by lak3rs
    I'm sure this is an incredibly simple question but I've recently started using Mathematica so it's all new to me. How do you scale the y axis? I try the following but it won't compile. Plot[y = {Exp[-(x^2+3x+2)]}, {x, 0, 5}, {y, 0, 1}]

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  • How can I change the tick marks scale in MATLAB?

    - by Wires
    Hey, I have a matrix A which I am plotting using imagesc(A). The matrix is a 512 X 512 matrix, but I need the axes to be labeled from 0 to 4000 instead of 0 to 512. I can't seem to find where I can change this instead of just changing from where to where the points are plotted!

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  • xpath query in a servlet gives exception

    - by user1401071
    I have a Document object initialized in the init() method of the servlet and use it in the doPost() method to service the requests. selectNodeList() xpath query gives exception when the servlet services many request at same time. The Exception is shown below: Caused by: javax.xml.transform.TransformerException: -1 at org.apache.xpath.XPath.execute(XPath.java:331) at org.apache.xpath.CachedXPathAPI.eval(CachedXPathAPI.java:328) at org.apache.xpath.CachedXPathAPI.selectNodeList(CachedXPathAPI.java:255) at org.apache.xpath.CachedXPathAPI.selectNodeList(CachedXPathAPI.java:235) at com.pro.bb.servlets.Controller.getDataOrPeriodForReport(Controller.java:511) ... 23 more Caused by: java.lang.ArrayIndexOutOfBoundsException: -1 at org.apache.xpath.XPathContext.pushCurrentNode(XPathContext.java:808) at org.apache.xpath.axes.PredicatedNodeTest.acceptNode(PredicatedNodeTest.java:447) at org.apache.xpath.axes.AxesWalker.nextNode(AxesWalker.java:409) at org.apache.xpath.axes.WalkingIterator.nextNode(WalkingIterator.java:176) at org.apache.xpath.axes.NodeSequence.nextNode(NodeSequence.java:320) at org.apache.xpath.axes.NodeSequence.runTo(NodeSequence.java:474) at org.apache.xpath.axes.NodeSequence.setRoot(NodeSequence.java:257) at org.apache.xpath.axes.LocPathIterator.execute(LocPathIterator.java:257) at org.apache.xpath.XPath.execute(XPath.java:308) Help me sort out the issue.

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  • Which run-time charting tools produce the best time axes?

    - by eft
    I need to generate and embed a time series chart into an ASP.NET application. Most run-time charting tools generate poor time axes, especially if the time scale is dynamic ie the user may choose to view data over a time scale of days, weeks, months or years. I'm looking for recommended tools that can be integrated into my app. Two that show promise are Chart Director and Google's annotated timeline visualization. Both are quite different in their implementation and have pros/cons.

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