point

Convert from string to system.drawing.point c#

若如初见. 提交于 2019-12-06 13:26:12
I want to convert from string {X=-24,Y=10} which generated by Point.ToString(); to Point again? I save the string value in xml file in save mode and I want read it back to point again in read mode. var myStringWhichCantBeChanged="{X=-24,Y=10}"; var g=Regex.Replace(myStringWhichCantBeChanged,@"[\{\}a-zA-Z=]", "").Split(','); Point pointResult = new Point( int.Parse (g[0]), int.Parse( g[1])); System.Drawing.Point doesn't define a Parse method at all - you will need to write your own that can take this format and return a Point structure. System.Windows.Point does have a Parse method and may be

How can i draw in picturebox a polygon which is marked on the edges

泄露秘密 提交于 2019-12-06 09:54:04
i tried in that way but i didnt get the needed results: System.Drawing.Point[] p = new System.Drawing.Point[6]; p[0].X = 0; p[0].Y = 0; p[1].X = 53; p[1].Y = 111; p[2].X = 114; p[2].Y = 86; p[3].X = 34; p[3].Y = 34; p[4].X = 165; p[4].Y = 7; g = PictureBox1.CreateGraphics(); g.DrawPolygon(pen1, p); what i want to do is to draw a polygon in picturebox which is defined with diffrent colors and according to the rates (the number of corner and coordinates of the edges ) Create an xOffset variable, set it to be 30, and add that to every X value. Let yOffset equal 50 and add it to all your Ys.

How to test if a point inside area with lat/lon and radius using Java?

送分小仙女□ 提交于 2019-12-06 07:56:40
问题 I've to write a method that has the following signature public class Position { double longitude; double latitude; } boolean isInsideTheArea(Position center, double radius, Position point); So if point is inside the area that has the center as its center and radius as its radius in miles , this should return true , false otherwise. 回答1: Use the Haversine formula to compute the distance between center and point . If that distance is greater than radius , return false ; otherwise return true .

Android draw point

孤者浪人 提交于 2019-12-06 07:27:00
how to draw full circle or point with canvas? I using canvas and path + paint classes my code: @Override public boolean onTouchEvent(MotionEvent event) { float eventX = event.getX(); float eventY = event.getY(); System.out.println(event.getAction()); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: path.moveTo(eventX, eventY); return true; case MotionEvent.ACTION_MOVE: path.lineTo(eventX, eventY); break; case MotionEvent.ACTION_UP: path.addCircle(eventX, eventY, .1F, Path.Direction.CW); break; default: return false; } // Schedules a repaint. invalidate(); return true; } Kanak Sony

Solving a cubic to find nearest point on a curve to a point

这一生的挚爱 提交于 2019-12-06 06:33:29
问题 Ok, I have a projectile that has its position defined such that: a.x = initialX + initialDX * time; a.y = initialY + initialDY * time + 0.5 * gravtiy * time^2; I want to be able to predict which obstacles in my environment this projectile will collide with. I plan on checking the distance from A the closest point on the curve to the point P . I figure that at the point A the tangent to the curve will be perpendicular to the vector AP , and that the tangent to the curve at A will simply be the

Distance from Point To Line great circle function not working right.

爷,独闯天下 提交于 2019-12-06 06:20:08
问题 I need to get the distance from a lat/lng point to a line. Of course needs to follow the Great Circle. I found a great article on this at http://www.movable-type.co.uk/scripts/latlong.html but the code is not working right. Either I am doing something wrong or there is something missing. Here is the function in question. See the link for the other functions if needed. var R = 3961.3 LatLon.crossTrack = function(lat1, lon1, lat2, lon2, lat3, lon3) { var d13 = LatLon.distHaversine(lat1, lon1,

Geodjango admin, display pointfield not as map

故事扮演 提交于 2019-12-06 04:39:19
问题 This may be a stupid question but I can't find any clear answers. How do I change the display in the Django Admin so the Pointfield does not show up like a OpenLayer Map but as a regular input field. I need to see the long, lat for debugging.. Do i have to change the field type? Widgets? Thanks! 回答1: Update This is how I managed -at last- to keep separate fields for lattitude and longitude without having to save them in the database since the values are already saved in the PointField. The

How do I enter an “empty” POINT() geometry value into a MySQL field of type POINT?

亡梦爱人 提交于 2019-12-06 03:04:55
问题 I have a table with a POINT geometry field. I enter latitude/longitude points into it like this: INSERT INTO table( point ) VALUES( POINT( lon_value, lat_value ); Sometimes I do not have lat/lon values to enter. I am unable to enter a blank, a NULL, or an empty POINT() ... since POINT(0,0) is actually a location on the globe, that won't work either. What is the solution here? 回答1: I would use coordinates of North Pole INSERT INTO table( point ) VALUES( POINT(0.0000,90.0000); If the actual

Shortest distance between point and path

我们两清 提交于 2019-12-06 02:36:45
for a geo-based online game I'm looking for an algorithm which finds the shortest distance between a specified point and a known path connected by x/y-coordinates, so that I can kill all redundant points/nodes. A link or keyword for this algorithm would help me a lot! thanks for reading For better understanding: Are you wanting to calculate this in order to say something like "if the point-to-path distance is zero, then remove the point"? If so, then there is probably an easier way to remove redundant nodes. Take the points three at a time (call them A , B , and C ). Calculate the angle

Test whether the point is between matching quotes (emacs lisp)

£可爱£侵袭症+ 提交于 2019-12-06 02:10:31
How do we check whether (point) is within matching "quotes" Example 1: " (point) ", but not within Example 2: "quote here" (point) "quote there", in Emacs Lisp? What you are looking for is syntax-ppss (defined in syntax.el ). It returns 10 values, and the 4th tells you whether the point is inside a string. (eq (nth 1 (text-properties-at (point))) font-lock-string-face) This checks whether the font of the text at point is recognized as a string (i.e. has the text property face font-lock-string-face). This looking for a more elegant solution. 来源: https://stackoverflow.com/questions/15078322/test