point

问题 I have two point of a line like p1(a,b) and p2(c,d) my point is X(x,y) I've searched and find like here but it isn't php can anyone help me 回答1: DISCLAIMER: I assumed the JS code from the linked answer works. Below is my attempt to convert the javascript code from here to PHP. function sqr($x) { return $x * $x; } function dist2($v, $w) { return sqr($v->x - $w->x) + sqr($v->y - $w->y); } function distToSegmentSquared($p, $v, $w) { $l2 = dist2($v, $w); if ($l2 == 0) return dist2($p, $v); $t = (

问题 Given p(0,0) , how do I retrieve points{(0,1),(1,1),(1,0),(1,-1),(0,-1),(-1,-1),(-1,0),(-1,1)} which are the perimeter points relative to p offset by 1. 回答1: for(x = p.x -1; x <= p.x + 1; x++) { for(y = p.y -1; y <= p.y + 1; y++) { // Do some stuff with each p } } Generic code here. Alter for your programming language and how you store the points. 来源： https://stackoverflow.com/questions/705091/retrieve-perimeter-points-relative-to-center-point-in-grid

问题 Let's say that you have a stick figure. Let's say the stick figure has an elbow and a hand. What if the stick figure wants to spin his hand in a windmill without moving his elbow? If the elbow serves as the center of a circle, and the hand must always be on the circle's circumference, and I know the exact location of the elbow and hand, how do I move the hand around the circle's circumference, while preserving the radius (the length of the arm between the elbow and hand because it really

问题 I have the following code... public class Point { private double x; private double y; static private final double RADTODEG = 180.0d / Math.PI ; static private final double DEGTORAD = Math.PI / 180.0d; /** * Rotates the point by a specific number of radians about a specific origin point. * @param origin The origin point about which to rotate the point * @param degrees The number of radians to rotate the point */ public void rotateByRadians(Point origin, double radians) { double cosVal = Math

问题 I'm trying to figure out how to find a point along a line (half way, to be precice). I need this to put a particle emitter in the correct location to leave a smoke-trail after bullets. I've got point A and point C. Point A is the barrel-muzzle, and point C is found using ray-cast. Now, in order to put the emitter in the right location I need to find point D. How do one do this? I attached a picure to make it more visual. No, I could not attach the picture, but here's a link. Thanks in advance

问题 I have tried hard But i am not able that how to find single point of interest in SURF Algorithm in Emgu CV. I wrote code for SURF. and I have problems that some times it goes in if statement near my numberd section "1" and some times it does not based on different images. why is that so? on the basis of that homography is calculated to not null. than I become able to draw circle or lines. which also have problem. circle or rectangle is drawn at 0,0 point on the image. Please help me. I will

问题 I need to take the mouse click position in float or double, how can I do that?In mouse listener, I take the point like this, e.getPoint(); but Point object's x and y values are integer, I need position in float or double. Any help will be appreciated. Edit I need exact resolution. 回答1: getPoint() gives you integer values because that is the precision in which coordinates are specified. See http://java.sun.com/j2se/1.4.2/docs/api/java/awt/Point.html. Why do you need floating-point values? Edit

问题 I am trying to add pointtext on canvas using paperjs. i am able to create pointtext on canvas but need to handle drag and resize of text. scope.drawText = function () { var pointTextLocation = new p.Point(100,100); var myText = new p.PointText(pointTextLocation); myText.fillColor = 'red'; myText.fontSize= 25; myText.content = 'Sample Text'; }; is it possible to do like below screen using paperjs. I didn't find anywhere on google. Please suggest how to do this? 回答1: It is possible (using Item

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 6 years ago . Write a method named removeSomePoints. This method takes an array of Points, and returns a new array of points that is the same as the original array, except that it removes all points that have x- and y

问题 I want to detect mouse click on my custom created region. 1) I ve tried this code with rectangle and it worked, but with string it doesnt GraphicsPath gp = new GraphicsPath(); Region reg = new Region(); private void Form1_Load(object sender, EventArgs e) { gp.AddString("TEXT", new FontFamily("Arial"),0, 20.0f, new Point(300, 10), StringFormat.GenericDefault); gp.Widen(Pens.AliceBlue); reg = new Region(gp); } and here is the part2 private void panel1_MouseDown(object sender, MouseEventArgs e)