Pay attention: Attribute href is obligatory, without it the area-tag does nothing! To add a click event, you’ll need to block default href. Your code should start as follows: $(“.blue”).on(“click”, function(e){ e.preventDefault(); /* your code here */ }); Live example here.
Convert the path to a polygon of arbitrary precision, and then calculate the area of the polygon. Interactive Demo: Area of Path via Subdivision (broken) At its core the above demo uses functions for adaptively subdividing path into a polygon and computing the area … Read more
What you basically need, is the distance between two points on the map: float[] results = new float[1]; Location.distanceBetween(centerLatitude, centerLongitude, testLatitude, testLongitude, results); float distanceInMeters = results[0]; boolean isWithin10km = distanceInMeters < 10000; If you have already Location objects: Location center; Location test; float distanceInMeters = center.distanceTo(test); boolean isWithin10km = distanceInMeters < 10000; Here is … Read more
Building off of @gnovice’s answer, you can actually create filled plots with shading only in the area between the two curves. Just use fill in conjunction with fliplr. Example: x=0:0.01:2*pi; %#initialize x array y1=sin(x); %#create first curve y2=sin(x)+.5; %#create second curve X=[x,fliplr(x)]; %#create continuous x value array for plotting Y=[y1,fliplr(y2)]; %#create y values for out … Read more
Implementation of Shoelace formula could be done in Numpy. Assuming these vertices: import numpy as np x = np.arange(0,1,0.001) y = np.sqrt(1-x**2) We can redefine the function in numpy to find the area: def PolyArea(x,y): return 0.5*np.abs(np.dot(x,np.roll(y,1))-np.dot(y,np.roll(x,1))) And getting results: print PolyArea(x,y) # 0.26353377782163534 Avoiding for loop makes this function ~50X faster than PolygonArea: %timeit … Read more
The numpy and scipy libraries include the composite trapezoidal (numpy.trapz) and Simpson’s (scipy.integrate.simpson) rules. Here’s a simple example. In both trapz and simpson, the argument dx=5 indicates that the spacing of the data along the x axis is 5 units. import numpy as np from scipy.integrate import simpson from numpy import trapz # The y … Read more
Find all circle intersections on the outer perimeter (e.g. B,D,F,H on the following diagram). Connect them together with the centres of the corresponding circles to form a polygon. The area of the union of the circles is the area of the polygon + the area of the circle slices defined by consecutive intersection points and … Read more