there are many post relating to this matter but most are old and there seem to be many different way of doing it.
I am trying to see if point exists inside a polygon however it is giving null value even though it is point on polygon.
here is my code.
select ST_contains(ST_geomfromtext('
Polygon((127.090656 37.517137,
127.092416 37.512525,
127.098445 37.513836,
127.095227 37.518346))'), Point(127.090656, 37.517137));
Thanks in advance.
In Mysql you need to close the polygon therefore I must add first point at the end of polygon again.
select ST_contains(ST_geomfromtext('
Polygon((**127.090656 37.517137**,
127.092416 37.512525,
127.098445 37.513836,
127.095227 37.518346,
**127.090656 37.517137**))'), Point(127.090656, 37.517137));
which now fixes my problem
and for cleaniness
I can set polygon as
SET #location_1 = ST_geomfromtext('
Polygon((**127.090656 37.517137**,
127.092416 37.512525,
127.098445 37.513836,
127.095227 37.518346,
**127.090656 37.517137**))');
select ST_contains( #location_1, Point(127.090656, 37.517137));
which to me is much cleaner. But maybe it require more memory for #location_1 in db (I'm not sure)?
I want to be able to store a circle using a fixed point g and radius d, then get those values back when retrieving the information.
The only way I've found to use those arguments to create a geographic object is to use buffer which produces a polygon:
https://dev.mysql.com/doc/refman/5.6/en/spatial-operator-functions.html#function_buffer
SELECT ASTEXT( BUFFER ( POINT( 10, 10 ), 5 ) );
| POLYGON((10 0,9.50932325672582 0.012045437948275506,9.019828596704395 0.048152733278032045,8.532695255446383 0.10823490035219052,8.049096779838717 0.1921471959676957,7.570198200967361 0.2996874680545609,7.097153227455378 0.4305966426779104,6.631101466077799 0.5845593481697922,6.173165676349102 0.7612046748871322,5.724449065697179 0.9601070687655664,5.286032631740024 1.1807873565164506,4.858972558067784 1.4227138999972784,4.444297669803978 1.6853038769745474,4.043006955075667 1.9679246851935517,3.6560671583635447 2.2698954663726303,3.2844104515298165 2.5904887464504087,2.9289321881345254 2.9289321881345254,2.5904887464504087 3.2844104515298165,2.2698954663726303 3.6560671583635447,1.9679246851935517 4.043006955075667,1.6853038769745474 4.444297669803978,1.4227138999972784 4.858972558067784,1.1807873565164506 5.286032631740024,0.9601070687655664 5.724449065697179,0.7612046748871322 6.173165676349102,0.5845593481697922 6.631101466077799,0.4305966426779104 7.097153227455378,0.2996874680545609 7.570198200967361,0.1921471959676957 8.049096779838717,0.10823490035219052 8.532695255446383,0.048152733278032045 9.019828596704395,0.012045437948275506 9.50932325672582,0 10,0.048152733278032045 10.980171403295605,0.10823490035219052 11.467304744553617,0.1921471959676957 11.950903220161283,0.2996874680545609 12.429801799032639,0.4305966426779104 12.902846772544622,0.5845593481697922 13.368898533922202,0.7612046748871322 13.826834323650898,0.9601070687655664 14.27555093430282,1.1807873565164506 14.713967368259976,1.4227138999972784 15.141027441932216,1.6853038769745474 15.555702330196022,1.9679246851935517 15.956993044924333,2.2698954663726303 16.343932841636455,2.5904887464504087 16.715589548470184,2.9289321881345254 17.071067811865476,3.2844104515298165 17.409511253549592,3.6560671583635447 17.73010453362737,4.043006955075667 18.03207531480645,4.444297669803978 18.314696123025453,4.858972558067784 18.577286100002723,5.286032631740024 18.81921264348355,5.724449065697179 19.039892931234434,6.173165676349102 19.238795325112868,6.631101466077799 19.41544065183021,7.097153227455378 19.569403357322088,7.570198200967361 19.70031253194544,8.049096779838717 19.807852804032304,8.532695255446383 19.89176509964781,9.019828596704395 19.95184726672197,9.50932325672582 19.987954562051726,10 20,10.49067674327418 19.987954562051726,10.980171403295605 19.95184726672197,11.467304744553617 19.89176509964781,11.950903220161283 19.807852804032304,12.429801799032639 19.70031253194544,12.902846772544622 19.569403357322088,13.368898533922202 19.41544065183021,13.826834323650898 19.238795325112868,14.27555093430282 19.039892931234434,14.713967368259976 18.81921264348355,15.141027441932216 18.577286100002723,15.555702330196022 18.314696123025453,15.956993044924333 18.03207531480645,16.343932841636455 17.73010453362737,16.715589548470184 17.409511253549592,17.071067811865476 17.071067811865476,17.409511253549592 16.715589548470184,17.73010453362737 16.343932841636455,18.03207531480645 15.956993044924333,18.314696123025453 15.555702330196022,18.577286100002723 15.141027441932216,18.81921264348355 14.713967368259976,19.039892931234434 14.27555093430282,19.238795325112868 13.826834323650898,19.41544065183021 13.368898533922202,19.569403357322088 12.902846772544622,19.70031253194544 12.429801799032639,19.807852804032304 11.950903220161283,19.89176509964781 11.467304744553617,19.95184726672197 10.980171403295605,19.987954562051726 10.49067674327418,20 10,19.95184726672197 9.019828596704395,19.89176509964781 8.532695255446383,19.807852804032304 8.049096779838717,19.70031253194544 7.570198200967361,19.569403357322088 7.097153227455378,19.41544065183021 6.631101466077799,19.238795325112868 6.173165676349102,19.039892931234434 5.724449065697179,18.81921264348355 5.286032631740024,18.577286100002723 4.858972558067784,18.314696123025453 4.444297669803978,18.03207531480645 4.043006955075667,17.73010453362737 3.6560671583635447,17.409511253549592 3.2844104515298165,17.071067811865476 2.9289321881345254,16.715589548470184 2.5904887464504087,16.343932841636455 2.2698954663726303,15.956993044924333 1.9679246851935517,15.555702330196022 1.6853038769745474,15.141027441932216 1.4227138999972784,14.713967368259976 1.1807873565164506,14.27555093430282 0.9601070687655664,13.826834323650898 0.7612046748871322,13.368898533922202 0.5845593481697922,12.902846772544622 0.4305966426779104,12.429801799032639 0.2996874680545609,11.950903220161283 0.1921471959676957,11.467304744553617 0.10823490035219052,10.980171403295605 0.048152733278032045,10.49067674327418 0.012045437948275506,10 0)) |
1 row in set (0.00 sec)
My problem with this is that I cannot retrieve the point and radius when selecting this row in the future, instead I get the polygon back.
Is there not a better way to store a circle for use with MySQL GeoSpatial Extensions?
Spatial databases are not great at storing curves; rather they tend to be approximated by lots of straight segments, so you're not actually retaining a circle. Support for curved geometries is improving but it's still not really there.
I would probably store the geometry as you have, as well as the radius as a floating point value.
Alternatively, if you only want to store the geometry, you can obtain the centre of the polygon ("circle") with the Centroid function, and then get the radius by converting the polygon to a line and determining the distance between the centroid and the line. There are other ways to determine this distance, too. the caveat is that because this is only an approximation of a circle, the distance between the centre of the circle and its edge is different when measured between the centre and one of the vertices, and when measured from the centre and an edge between two vertices. So if you do not store the radius independently of the geometry, ideally you should measure distance between a vertex and the centre, which will be equal to the original radius (buffer distance). Practically the difference will be rather small so long as your "circle" has dense vertices.
I have an SSRS Line chart which plots supply points with square feet on the X axis and Price on the Y axis. Right now I don't really care about making it pretty just getting the lines to show up correctly. I am plotting the points and grouping by Subdivision/Builder.
So for example Subdivision A has builders Y and Z. I want to show different colors and lines for Subdivision A builder Y verses Subdivision A Builder Z.
The problem is that the lines are not connecting when a point for another subdivision builder combination breaks up that line.
The grey line and points below are not all connected as the yellow point is between the grey points so the grey line is not connected to all grey points.
How can I make the points of the same color (same Subdivision/Builder) connected via a line?
As I found out the hard way recently, this problem is often caused by null values in the data not being properly handled by SSRS. Without seeing your data, I can't be certain that's the cause, but nulls were the culprit I encountered the same behavior.
The solutions usually involve assigning values to the color of the EmptyPoint property on the Series, sometimes in conjunction with setting the EmptyPointValue to specify null handling. I've found many references to this problem on the web, but I'll only post links to the best two, both of which are on StackExchange:
The thread SSRS Line Chart NULL VALUE - Horizontal Line contains a thorough discussion of this issue. The usual workaround given is to hard-code a color expression for each line using an IIf, but sometimes this isn't an option, especially if the field you're grouping on has dynamic, unpredictable values, as my dataset did.
The picture posted there depicts clear examples of the same type of line breaks. The user named trubs posted a code sample which illustrates how to set the EmptyPoint, in case where an Iif will work:
=iif(isNothing(Fields!SelectedValue.Value),'No Color',"LightBlue")
The first reply in SSRS Line Chart Not Connecting Data Points details a workaround for cases when the EmptyPoint value & nulls are the root cause and simple hard-coded IIfs won't do the trick. Although I have yet to get my line colors to match the point markers the way I'd like, I can verify that this solution at least gives you your lines back and allows you to assign a variety of colors to them. It's fairly simple and involves merely pasting in some VB code for a couple color properties.
I was asked in the comments section to provide the details of the solutions, but don't want to plagiarize, so I'll simply do a long direct quote of JohnBob's answer:
Firstly, in order to get the lines to join up, you need to set the
EmptyPoint colour for the series.
Select your series in your chart In the properties tab (not the
dialog) drill down into the EmptyPoint property and set the colour to
be Black
This will get them joining up - yay! But part of the line is colour
and the other part is black, right? That's a bit silly, especially
considering if you leave the colour to Automatic on the EmptyPoint
that it will be transparent.
So, then we need to get the series and the EmptyPoint's colours in
sync. Using code from here. I added some code to the code of the
report.
1). Right click on an empty space on the report and select "Report
Properties" 2). In the code tab, paste the following:
Private colorPalette As String() = {"#418CF0", "#FCB441", "#E0400A", "#05642E", "#1A3B69", "#BFBFBF", "#E0400A", "#FCB441", "DarkBlue", "Tomato", "Orange", "CornflowerBlue", "Gold", "Red", "Green", "LightBlue", "Lime", "Maroon", "LightSteelBlue", "Tan", "Silver"}
Private count As Integer = 0
Private mapping As New System.Collections.Hashtable()
Public Function GetColor(ByVal groupingValue As String) As String
If mapping.ContainsKey(groupingValue) Then
Return mapping(groupingValue)
End If
Dim c As String = colorPalette(count Mod colorPalette.Length)
count = count + 1
mapping.Add(groupingValue, c)
Return c
End Function
Then we need to call this code when setting the colour of the series
and of the EmptyPoint.
Select your series
In the properties tab paste something the following (replace WhateverTheGroupIsForYourSeries with your series group name):
=Code.GetColor(Fields!*WhateverTheGroupIsForYourSeries*.Value)
Drill down to the color element of the EmptyPoint Series property
Paste the same text as from point two [e.g. =Code.GetColor(Fields!*WhateverTheGroupIsForYourSeries*.Value)]
And voila! You're done! I can't believe how unnecessarily difficult
this is :D
I hope this helps.
Just put your Fields!(YourSeriesGroup).Value in Series Groups to above of
Fields!(YourCategoryGroup).Value in Category Groups, your series group should be in both Series Groups and Category Groups (should be above of your initial category group).
And after that right click horizontal axis and select Horizontal Axis Properties. Set Axis Type to Scalar and click OK.
I am having this problem, where I have several cars, numbers and letters, and need to put 5 cars in the starting places. -random order is ok.
I' having trouble finding in AS3 a way so that the EndX and EndY of each object can be in the starting lines and be considered right no matter the order!
I'm having trouble putting the code here so, heres a titanpad with the code:
this is the code:
being (um, dois, tres, quatro) the movieclip instance name for each numbered car.
https://titanpad.com/42vtnCbvLu
First of all, you could probably benefit by using the distance between two points formula and seeing if the distance is less than a certain value rather than checking in all 4 directions manually:
Math.abs(Math.sqrt((x2-x1)^2 + (y2-y1)^2))
Let the position of the car be (x1,y1) and the start position (x2,y2).
This formula will give you the distance between the two points in any direction, and you could test maybe whether this value is less than your offset.
As for the cars in any order part, I'm interpreting that you have your cars and you want the user to drag them to one of 5 spots, a bit like this:
spot1
spot2
spot3
spot4
spot5
All with respective coordinates. My suggestion would be to have a boolean flag for whether each spot is occupied that stops the program checking whether a car is put there after it has been taken once.
Once all these flags are true, then you can proceed.
Hope this helps.
I am trying to query all from a table of points, all of the points that are inside a certain polygon. I have tried to use st_contains() and for some reason it just won't work.
To made it simple, I have made a table with the points (1,1),(0,0),(100,100) I have used:
GeomFromText('Point(0 0)')
This is my query:
SELECT id, astext(point) FROM points WHERE st_within(point,GeomFromText('Polygon(10 10, 10 -10, -10 -10, -10 10, 10 10)'))
I have also found this question, which made me feel confident that there is something very big that I'm missing...
Please, tell me what I'm doing wrong...
Thanks :)
There are two methods to determine if a point is within a polygon (winding number or the even odd rule).
https://www.youtube.com/watch?v=AHs2Ugxo7-8
http://en.wikipedia.org/wiki/Even%E2%80%93odd_rule
This depends how you wish to treat a polygon.
Apparently, it is very important that the "Polygon Creation String" will use at least 2 sets of parentheses, even if it's a 1-line polygon. for example:
GOOD Polygon Creation:
GeomFromText('Polygon((10 10,10 -10,-10 -10,10 10))')
BAD Polygon Creation:
GeomFromText('Polygon(10 10,10 -10,-10 -10,10 10)')