polygon

问题 I am working on a 2D game as a learning project and I have hit a bump. I cannot figure out how to move a Polygon object using the KeyListener within a JPanel (which is added to a JFrame). I've tried the frog.translate(int x, int y) method, which does not update the location. I've also tried changing the array coordinates manually. A sample of my code is below: import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt

问题 I refer to the answer for this question and have additional question. I have modify the code as below: library(ggplot2) ids <- letters[1:2] # IDs and values to use for fill colour values <- data.frame( id = ids, value = c(4,5) ) # Polygon position positions <- data.frame( id = c(rep(ids, each = 10),rep("b",5)), # shape hole shape hole x = c(1,4,4,1,1, 2,2,3,3,2, 5,10,10,5,5, 6,6,7,7,6, 8,8,9,9,8), y = c(1,1,4,4,1, 2,3,3,2,2, 5,5,10,10,5, 6,7,7,6,6, 8,9,9,8,8) ) # Merge positions and values

问题 I want to divide a self-intersecting polygon into simple polygons. I have the edges and the intersection points saved in a data structure (a connected list). So here is an example. I have a connected list with the x,y coordinates of the edges and the intersection points of the polygon. According to the polygon in this picture it would be :: (1) -> (2) -> (3) ... -> (7). What I'm trying to do is to get the edges of the simple polygons (triangles here). In this case :: 1,2,7 / 3,4,5 / 5,6,7.

问题 I would like to calculate the are of a polygon drawn in a map fragment for a college project. This is how I draw my polygon. @Override public void onMapClick(LatLng point) { //tvLocInfo.setText("New marker added@" + point.toString()); map.addMarker(new MarkerOptions().position(point).draggable(true).title(point.toString())); markerClicked = false; } @Override public void onMapLongClick(LatLng point) { //tvLocInfo.setText("New marker added@" + point.toString()); map.clear(); } @Override public

问题 When a user has drawn a polygon in Google Maps using the built in Drawing Manager I save the polygon path. I want to convert this polygon path to an SVG path so that I can reproduce the shape of the polygon drawn easily, without requiring lots of additional map loads and calls to the Google Maps API. I'm sure it's just some fairly trivial mathematics but can't work out how to do it. Do I need to create a bounding box around the points and translate it to LatLng 0, 0 before scaling it down or

问题 I am developing an application using the Google Maps API v3, and I'm struggling to know how to find out if an X coordinate is inside a polygon. 回答1: You can use the Geometry Library of the Google Maps JS API. There's a function called containsLocation which tells you if a given LatLng is inside a Polygon . Note that it's a Polygon, not a Polyline. A Polyline is (as it says in the name) a line. So there is no such thing as a point being inside a polyline. You can check if a point is inside a

问题 In drawing application we can identify when the user is starting to draw and moving the finger to make a line/shape. I'm trying to do the same on a map, how can I do this? 回答1: Basic steps will involve: 1) Add a overlay view whenever user starts to draw. lazy var canvasView:CanvasView = { var overlayView = CanvasView(frame: self.googleMapView.frame) overlayView.isUserInteractionEnabled = true overlayView.delegate = self return overlayView }() @IBAction func drawActn(_ sender: AnyObject?) {

问题 How can i draw a polygon according to the input coordinates which are given in C#. 回答1: You didn't show any code because based on those coordinate, you are applying some form of scaling to the image. Using the Paint event of a PictureBox, here is an example using those coordinates on the screen. It fills in the polygon, then draws the border, then it loops through all the points to draw the red circle: void pictureBox1_Paint(object sender, PaintEventArgs e) { e.Graphics.SmoothingMode =

问题 I have a bitmap out of which I'm cutting out a multipi point polygon. I'm curious what the correct process is for taking the pixels within the arbitrary shape and copying them onto a new bitmap where the rest of the pixels are transparent. The objective is to allow the user to trace the shape and then remove everything outside the polygon. I have the polygon part worked out (as a an array of points), but now am stumped as to how to transfer just the selected pixels to a new Bitmap. TIA 回答1:

问题 I am writing a program in which I need to draw polygons of an arbitrary number of sides, each one being translated by a given formula which changes dynamically. There is some rather interesting mathematics involved but I am stuck on this probelm. How can I calculate the coordinates of the vertices of a regular polygon (one in which all angles are equal), given only the number of sides , and ideally (but not neccessarily) having the origin at the centre? For example: a hexagon might have the