You can pass this structure directly to the patch command fvc surf2patchz calculates the patch data from the surfaces zdata matrix z. I want to ensure that the patchs i plot are always displayed, not depending if they are to small compared to the current axes units. If youve found any other interesting use of these undocumentedhidden legend properties, please share it in a comment below. Transparency is a very useful feature when creating pictures in 3d. And then pull up the saved image and draw the lines atop it again. If x and y are matrices, matlab draws one polygon per column. Problems with the patch transparency in a gui matlab. The facealpha property that you would like to change is a property of a patch.
The facecolor property is set to interp to make the. Based on your location, we recommend that you select. May 05, 2012 hi everyone, i need a bit help regarding the following situation. Why do i receive an error when i try to change the transparency. Like its analog, and unlike higher level functions such as fillm and fill3m, patchm adds patch objects to the current map axes regardless of hold state. This mapping toolbox function is very similar to the standard matlab patch function.
I tried to search and i think it has to do something with cdata but i. Learn more about legend facealpha opaque transparent patch matlab. In any case, as noted above, while making the legend fullytransparent is simple, making it semitransparent is more problematic. I am trying to write a small program that will be able to get the number and dimensions of some rectangles from the user and then randomly place them on a palette lets say a bigger rectangle that will represent a map or workspace. The data can be numeric values that are scaled to map linearly into the current colormap, integer values that are used. I suppose there is a problem with my version, since area and bar plot seem to lack a facealpha option. When i try to plot following patch, i get a patch which is not allfilled, but has some blank parts.
The way matlab interprets cdata depends on the type of data supplied. You can improve the speed with which matlab renders patch objects using the following techniques. Patch and transparency issue matlab answers matlab central. There are probably quicker methods that i dont have time to think about so someone else will likely suggest them, but instead of your outer k loop just keep a counter that you initialise and increment within your inner loop to give you your k index into the imagepatches. My actual plot has the x values which are a time and date exported from excel, and then converted to matlab date and time by using datetime and stored in the vector time.
However, this is not very simple because the image is not saved with the same dimensions as the original so i need to bring it into photoshop to change the dimensions first. Lets look at a simple example to explore some of these issues. Changing transparency of images, patches or surfaces. If c is a column vector or a matrix, fill3 generates polygons with interpolated colors and sets the patch object facecolor property to interp. You can specify color for each vertex, each face, or a single color for the entire patch. Learn more about transparency, bars, bar, histogram, barseries, alpha. When i try to plot a transparent patch on an image in my gui, it doesnt work, i mean, the patch doesnt become transparent. This section concentrates on use of the patch function. However when i set my shaded errors bars to be transparent the left and bottom x axes disappear. I agree that the green patch is transparent i designed it that way with facealpha but my problem is that this transparency is not displayed by the legend. Use the facealpha and edgealpha properties to make the larger patch object more translucent and the inside one less translucent.
But there are a suprising number of things to think about when youre using transparency in 3d. Follow 3 views last 30 days cameron crook on 8 dec 2016. I am facing the same problem facealpha is not working in histfit command. This option sets the facealpha property for the objects. Each element becomes the cdata property value for the respective patch object.
The problem is actually caused by the rendrer of the figure object. Problem with patch transparency facealpha ask question asked 8 years, 5 months ago. Interpret the values as transparency values 0 is invisible, 1 is opaque by setting the alphadatamapping property. Patch properties control the appearance and behavior of patch objects. Transparent uipanels matlab uipanels can be made transparent, for very useful effects.
Set the last entry of y to nan so that patch creates a line instead of a closed polygon define one transparency value per vertex by setting the facevertexalphadata property to a column vector. Problem with rendering patch object when facevertexalphadata is. The same code on 2017a perhaps 2014b and newer versions too shows a different plot. The fill function creates colored polygons fillx,y,c creates filled polygons from the data in x and y with vertex color specified by c. The only thing you need to do after that, is set the facealpha for each patch. Patch color and transparency problem matlab answers. In this case, the smallest value is c2,21, and it maps to the first row in the colormap. Painters export problem matlab answers matlab central. The output, fvc, is a structure containing the face, vertex, and color data. It can be a single colorspec, one color per face, or one color per vertex see remarks. This illustration shows the x, y, and zcoordinates of the vertices defining a cube in which the sides are one unit in length if you specify the x, y, and zcoordinate arguments as vectors, they render as a single polygon with points connected in sequence. Aug 14, 20 your second patch is visible if you zoom in the plot. Kssv on 8 dec 2016 i have a script which is plotting some 3d objects made with patch.
C is a vector or matrix used as an index into the colormap. A number of matlab functions create patch objects fill, fill3, isosurface, isocaps, some of the contour functions, and patch. Getting transparency in a vector plot matlab answers. I have a very strange problem so i want to create a series of patch objects and plot them together for simplicity in this example there is only one object. Nov 22, 2017 so some faces are transparent, some are half transparent, i do not get this. I would also like to plot the trajectory of one of the objects. If you separate the faces in the first patch into separate faces you get 12 edges. When this occurs, automatic reprojection of the patch data by changing the projection or any of its parameters will not be possible. For constant transparency across the entire patch, set the facevertexalphadata to a constant between 0 fully transparent and 1 fully opaque, and set the facealpha property to flat. Error creating or updating patch error in value of property. Since true color specified with the facevertexcdata property has the same format as a matlab colormap i. Each row element becomes the cdata property value for the nth patch object, where n is the corresponding column in x. A cube is defined by eight vertices that form six sides. So some faces are transparent, some are half transparent, i do not get this.
You define a patch by specifying the coordinates of its vertices and some form of color data. How do i set transparency of area plot in r2014b learn more about facealpha, r2014b, area plot. Rppdsidelength,centerloc,facecolor,edgecolor,alpha creates an rppd with the following arguments. If c is a 1by3 vector, it is assumed to be an rgb triplet, specifying a color directly. As with patch faces, matlab scales the values in c to the number of rows in the colormap. Plots a rectangular parallelepiped cuboid patch object. Learn more about eps, vector, area, plot, transparency, facealpha matlab. How to set facealpha of area plot matlab answers matlab. Triangular surface plot matlab trisurf mathworks france. Ensure that patch is displayed matlab answers matlab central. I encountered some strange problem with patch ploting in matlab 2010b with windows xp. Creating transparent rectangles when x values are times with. Convert surface data to patch data matlab surf2patch. First well create a patch with three rectangular faces.
This illustration shows the x, y, and zcoordinates of the vertices defining a cube in which the sides are one unit in length. Edge color, specified as the commaseparated pair consisting of edgecolor and a color name, an rgb triplet, or none. Patch facecolor property matlab answers matlab central. Each patch objects facecolor property is set to flat. By changing property values, you can modify certain aspects of the patch. Set the last entry of y to nan so that patch creates a line instead of a closed polygon.
May 12, 2011 the only way i have found a way around this is to save the image. I have an image and i want to create a patch with color map same as of image i. If you are using patch objects that have many vertices per patch face, you should modify your data so that each face has only three vertices, but still looks like your original object. It looks like the problem may be the opengl renderer. One option is to create your own function that implements the patch function and then call it in your plots. Filled 2d polygons matlab fill mathworks switzerland. The only way i have found a way around this is to save the image. Creating 3d models with patches using matlab graphics.
Problem using facevertexalphadata to control edge visibility. Matlab graphical objects patch follow 2 views last 30 days raldi on 5 may 2012. Since each face shares vertices with four other faces, you can define the patch more efficiently by defining each vertex only once and then specifying the order in which to connect these vertices to form each face. If c is a row vector, fill generates flatshaded polygons where each element determines the color of the polygon defined by the respective column of the x and y matrices.
Learn more about patch, facealpha, rendering, visual stacking matlab. Matlab graphical objects patch matlab answers matlab. Generalizing the question i do not care for a cube of course, just some general 3dhexahedron. Dec 01, 20 how to make color and lighting continuouse using. Project patch objects on map axes matlab patchm mathworks. For example, facecolor,y sets the face color to yellow. Since you are drawing a patch so thin from 9000 to 9001 the resolution of the screen is not enough to make it visible. Plotting with plot3 and patch matlab answers matlab. Removing graphic objects that fall outside the map frame is called trimming. The default color of 0 0 0 corresponds to black boundaries an rgb triplet is a threeelement row vector whose elements specify the intensities of the. Starting in r2014b, you can use dot notation to query and set properties.
Hi everyone, i need a bit help regarding the following situation. In the patch call, the independent variable x has to retrace its steps thus the flip call to complete the curve, while the dependent variable y only has to define those retraced steps as zero, since by our definition here the patch only exists between the xaxis and y at any particular point. You can pass this structure directly to the patch command. The largest value is c3,16, and it maps to the last row in the colormap. Transparency seems to be doing something else than i expect.
To create multiple polygons, specify x and y as matrices where each column corresponds to a polygon. They reappear if i go setgca, linewidth, 2 thereby making the axes thicker, but the right and top axes then are disproportionately think. Learn more about patch, plot, facealpha, problems with patch, patch changes plot properties, plot properties, background color matlab. Bizare problem with facealpha and rendering matlab. It allows transparent area plots in r2014b and newer. Changing facealpha on a patch changes the plot matlab. If you are using an earlier release, use the get and set functions instead.
Learn more about patch, facecolor, facevertexcdata, graphics, interpolation, patch properties. If x, y, and z are matrices of the same size, fill3 forms a vertex from the corresponding elements of x, y, and z all from the same matrix location, and creates one polygon from the data in each column if x, y, or z is a matrix, fill3 replicates any column vector argument to produce matrices of the required size. Interpret the values as transparency values 0 is invisible, 1 is opaque by setting the alphadatamapping property to none. Define one transparency value per vertex by setting the facevertexalphadata property to a column vector. Mar 11, 2015 in any case, as noted above, while making the legend fullytransparent is simple, making it semitransparent is more problematic. The arrow shows that while the patch is indeed transparent, the green area in the legend is not. Creating transparent rectangles when x values are times. Plot one or more filled polygonal regions matlab patch.
This can be solve if i set the renderer to painters see below, but then i cant change the transparency of the patch. Edgealpha,0,facealpha,1 i have prepared patch for painters export using accepted answer in. Multicolumn grid legend this article explains how to use undocumented axes listeners for implementing multicolumn plot legends plot legend title titles to plot legends are easy to achieve in hg1 r2014a or earlier, but much more difficult in hg2 r2014b or newer. I am trying to write a small program that will be able to get the number and dimensions of some rectangles from the user and then randomly place them on a palette lets say a.
If c is a row vector, lengthc must equal sizex,2 and sizey,2. Plotting with plot3 and patch matlab answers matlab central. When i create a single patch object with different transparency and color per face, matlab r2016b under osx seems having a bug in rendering. The transparency of a patch is defined by its facealpha and facevertexalphadata properties. This matlab function fills threedimensional polygons. If, after trimming to the map frame no polygons remain to be seen within it, patchm creates no patches and returns an empty 0by1 handle. The following matlab project contains the source code and matlab examples used for plots a rectangular parallelepiped cuboid patch object. I only replaced your last line of code with the last three lines shown here. Choose a web site to get translated content where available and see local events and offers. Jun 08, 2011 use the facealpha and edgealpha properties to make the larger patch object more translucent and the inside one less translucent. The largest value is c3,16, and it maps to the last row in the colormap this code creates the patch object described in the preceding illustration. Ensure that patch is displayed matlab answers matlab. Specify value as a scalar value between 0 transparent and 1 no transparency, clear, or opaque.
But when i do the same out of my gui in the matlab command line, it works perfecty. If c is a row vector, fill3 generates flatshaded polygons and sets the facecolor property of the patch objects to flat. Problem with visual stacking of my patches matlab answers. I tried to search and i think it has to do something with cdata but i dont understand how to apply that.