area

Where would i go to look for algorithms that take a 2d grid of values that are either 0 or 1 as input and then identifies all possible non-overlapping rectangles in it? In a more practical explanation: I am drawing a grid that is represented by a number of squares, and i wish to find a way to combine as many adjacent squares into rectangles as possible, in order to cut down on the time spent on cycling through each square and drawing it. Maximum efficiency is not needed, speed is more important. Addendum: Apparently what i am looking for seems to be a technique called Tesselation. Now i only

I have the file data.txt with two columns and N rows, something like this: 0.009943796 0.4667975 0.009795735 0.46777886 0.009623984 0.46897832 0.009564759 0.46941447 0.009546991 0.4703958 0.009428543 0.47224948 0.009375241 0.47475737 0.009298249 0.4767201 [...] Every couple of values in the file correspond to one point coordinates (x,y). If plotted, this points generate a curve. I would like to calculate the area under curve (AUC) of this curve. So I load the data: data = load("data.txt"); X = data(:,1); Y = data(:,2); So, X contains all the x coordinates of the points, and Y all the y

Like you can see in my code, I take a screenshot and save it to the photo album. //for retina displays if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) { UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, NO, [UIScreen mainScreen].scale); } else { UIGraphicsBeginImageContext(self.view.bounds.size); } [self.view.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil); At the beginning I used webview.size instead of self

I'm working with Areas in Java. My test program draws three random triangles and combines them to form one or more polygons. After the Areas are .add() ed together, I use PathIterator to trace the edges. Sometimes, however, the Area objects will not combine as they should... and as you can see in the last image I posted, extra edges will be drawn. I think the problem is caused by rounding inaccuracies in Java's Area class (when I debug the test program, the Area shows the gaps before the PathIterator is used), but I don't think Java provides any other way to combine shapes. Any solutions?

I've got the following problem. I want to zoom-in a Scatterplot and then select all the displayed elements. It would be sufficient to somehow get the displayed area in the zoomed-in Scatterplot. From the range of this area i could determine which elements are displayed in the area and which are not. \edit: Found the Solution (Implementing AxisChangeListener Interface) import java.awt.Color; import java.awt.Dimension; import org.jfree.chart.ChartPanel; import org.jfree.chart.event.AxisChangeEvent; import org.jfree.chart.event.AxisChangeListener; import org.jfree.chart.plot.PlotOrientation;