JFreeChart has quite flexible support for crosshairs. To do what you described I would use an Overlay on the ChartPanel, and update the crosshairs from your ChartMouseListener. Here is a self-contained example (which I’ll add to the collection of demos that we ship with the JFreeChart Developer Guide): package org.jfree.chart.demo; import java.awt.BasicStroke; import java.awt.Color; import … Read more
This is becoming a FAQ. See the replies to these questions: Add “Search Area” outline onto google maps result Google has started highlighting search areas in Pink color. Is this feature available in Google Maps API 3?
There is some confusion here. OpenGL is right handed in object space and world space. But in window space (aka screen space) we are suddenly left handed. How did this happen? The way we get from right-handed to left-handed is a negative z scaling entry in the glOrtho or glFrustum projection matrices. Scaling z by … Read more
What you’re using is called the haversine formula, which calculates the distance between two points on a sphere as the crow flies. The Google Maps link you provided shows the distance as 2.2 km because it’s not a straight line. Wolfram Alpha is a great resource for doing geographic calculations, and also shows a distance … Read more
Update: User cphyc has kindly created a Github repository for the code in this answer (see here), and bundled the code into a package which may be installed using pip install matplotlib-label-lines. Pretty Picture: In matplotlib it’s pretty easy to label contour plots (either automatically or by manually placing labels with mouse clicks). There does … Read more
To get the x and y position of “any other unrelated application” you’re going to have to query the OS and that means likely using either JNI, JNA or some other scripting utility such as AutoIt (if Windows). I recommend either JNA or the scripting utility since both are much easier to use than JNI … Read more
Please check how i’m using in my app and its working perfect.I’m using fused api for update location please follow few steps.Currently you using very old approach.So, there is no need now and pass here your time in milliseconds what you want UPDATE_INTERVAL_IN_MILLISECONDS Step 1. Make this class GoogleLocationService.java public class GoogleLocationService { private GoogleServicesCallbacks … Read more
I’ve written for my project the following function; it receives an THREE.Object3D instance and a camera as a parameters and returns the position on the screen. function toScreenPosition(obj, camera) { var vector = new THREE.Vector3(); var widthHalf = 0.5*renderer.context.canvas.width; var heightHalf = 0.5*renderer.context.canvas.height; obj.updateMatrixWorld(); vector.setFromMatrixPosition(obj.matrixWorld); vector.project(camera); vector.x = ( vector.x * widthHalf ) + widthHalf; … 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 Android API already provides a method to achieve that. Try this: Rect offsetViewBounds = new Rect(); //returns the visible bounds childView.getDrawingRect(offsetViewBounds); // calculates the relative coordinates to the parent parentViewGroup.offsetDescendantRectToMyCoords(childView, offsetViewBounds); int relativeTop = offsetViewBounds.top; int relativeLeft = offsetViewBounds.left; Here is the doc