How to spawn markers on android map inside a circular range
I'm trying to make a pokemonGo style application.
I have tried using latitude and longitude formulas to calculate the range of coordinates where markers (pokemon) should spawn but I only managed to get a rectangular area. I would like to spawn them on a circular area around the player, how can I do that?
Here is the code where I calculated the rectangular area.
Random r = new Random();
int randomDistanceLatitude = r.nextInt(range*2) - range;
r = new Random();
int randomDistanceLongitude = r.nextInt(range*2) - range;
double latitudeDegreeToAdd = 1.7 * randomDistanceLatitude * 0.000009043717329571146924;
double longitudeDegreeToAdd = randomDistanceLongitude * (1 / (111320 * Math.cos(infoLocal.getLastKnownLocation().getLatitude())));
LatLng enemy1Location = new LatLng(infoLocal.getLastKnownLocation().getLatitude() + latitudeDegreeToAdd, infoLocal.getLastKnownLocation().getLongitude() + longitudeDegreeToAdd);
enemies[i] = mMap.addMarker(new MarkerOptions().position(enemy1Location).title("Monster").snippet("Click to Attack!").icon(BitmapDescriptorFactory.fromResource(R.drawable.enemy3)).anchor(0.5f, 0.5f));
java
android dictionary area asked Nov 23 '18 at 9:35
Sad HyenaSad Hyena
1148
add a comment |
I'm trying to make a pokemonGo style application.
I have tried using latitude and longitude formulas to calculate the range of coordinates where markers (pokemon) should spawn but I only managed to get a rectangular area. I would like to spawn them on a circular area around the player, how can I do that?
Here is the code where I calculated the rectangular area.
Random r = new Random();
int randomDistanceLatitude = r.nextInt(range*2) - range;
r = new Random();
int randomDistanceLongitude = r.nextInt(range*2) - range;
double latitudeDegreeToAdd = 1.7 * randomDistanceLatitude * 0.000009043717329571146924;
double longitudeDegreeToAdd = randomDistanceLongitude * (1 / (111320 * Math.cos(infoLocal.getLastKnownLocation().getLatitude())));
LatLng enemy1Location = new LatLng(infoLocal.getLastKnownLocation().getLatitude() + latitudeDegreeToAdd, infoLocal.getLastKnownLocation().getLongitude() + longitudeDegreeToAdd);
enemies[i] = mMap.addMarker(new MarkerOptions().position(enemy1Location).title("Monster").snippet("Click to Attack!").icon(BitmapDescriptorFactory.fromResource(R.drawable.enemy3)).anchor(0.5f, 0.5f));
java
android dictionary area asked Nov 23 '18 at 9:35
Sad HyenaSad Hyena
1148
1
do you have an actual question?
– Stultuske
Nov 23 '18 at 9:36
@Stultuske as I said, I want them to spawn in a circular area not in a rectangular area around the player
– Sad Hyena
Nov 23 '18 at 9:38
... still not a question. what exactly are you having problems with?
– Stultuske
Nov 23 '18 at 9:39
@Stultuske sorry, should have written this, I don't know how to spawn them in a circular area, the formulas that i posted may be useless for this purpose
– Sad Hyena
Nov 23 '18 at 9:43
can someone help me?
– Sad Hyena
Nov 30 '18 at 9:31
add a comment |
I'm trying to make a pokemonGo style application.
I have tried using latitude and longitude formulas to calculate the range of coordinates where markers (pokemon) should spawn but I only managed to get a rectangular area. I would like to spawn them on a circular area around the player, how can I do that?
Here is the code where I calculated the rectangular area.
Random r = new Random();
int randomDistanceLatitude = r.nextInt(range*2) - range;
r = new Random();
int randomDistanceLongitude = r.nextInt(range*2) - range;
double latitudeDegreeToAdd = 1.7 * randomDistanceLatitude * 0.000009043717329571146924;
double longitudeDegreeToAdd = randomDistanceLongitude * (1 / (111320 * Math.cos(infoLocal.getLastKnownLocation().getLatitude())));
LatLng enemy1Location = new LatLng(infoLocal.getLastKnownLocation().getLatitude() + latitudeDegreeToAdd, infoLocal.getLastKnownLocation().getLongitude() + longitudeDegreeToAdd);
enemies[i] = mMap.addMarker(new MarkerOptions().position(enemy1Location).title("Monster").snippet("Click to Attack!").icon(BitmapDescriptorFactory.fromResource(R.drawable.enemy3)).anchor(0.5f, 0.5f));
java
android dictionary area asked Nov 23 '18 at 9:35
Sad HyenaSad Hyena
1148
I'm trying to make a pokemonGo style application.
I have tried using latitude and longitude formulas to calculate the range of coordinates where markers (pokemon) should spawn but I only managed to get a rectangular area. I would like to spawn them on a circular area around the player, how can I do that?
Here is the code where I calculated the rectangular area.
Random r = new Random();
int randomDistanceLatitude = r.nextInt(range*2) - range;
r = new Random();
int randomDistanceLongitude = r.nextInt(range*2) - range;
double latitudeDegreeToAdd = 1.7 * randomDistanceLatitude * 0.000009043717329571146924;
double longitudeDegreeToAdd = randomDistanceLongitude * (1 / (111320 * Math.cos(infoLocal.getLastKnownLocation().getLatitude())));
LatLng enemy1Location = new LatLng(infoLocal.getLastKnownLocation().getLatitude() + latitudeDegreeToAdd, infoLocal.getLastKnownLocation().getLongitude() + longitudeDegreeToAdd);
enemies[i] = mMap.addMarker(new MarkerOptions().position(enemy1Location).title("Monster").snippet("Click to Attack!").icon(BitmapDescriptorFactory.fromResource(R.drawable.enemy3)).anchor(0.5f, 0.5f));
java
android dictionary area java
android dictionary area asked Nov 23 '18 at 9:35
Sad HyenaSad Hyena
1148
asked Nov 23 '18 at 9:35
Sad HyenaSad Hyena
1148
edited Jan 27 at 10:59
Sad Hyena
asked Nov 23 '18 at 9:35
Sad HyenaSad Hyena
1148
asked Nov 23 '18 at 9:35
Sad HyenaSad Hyena
1148
asked Nov 23 '18 at 9:35
Sad HyenaSad Hyena
1148
1148
1
do you have an actual question?
– Stultuske
Nov 23 '18 at 9:36
@Stultuske as I said, I want them to spawn in a circular area not in a rectangular area around the player
– Sad Hyena
Nov 23 '18 at 9:38
... still not a question. what exactly are you having problems with?
– Stultuske
Nov 23 '18 at 9:39
@Stultuske sorry, should have written this, I don't know how to spawn them in a circular area, the formulas that i posted may be useless for this purpose
– Sad Hyena
Nov 23 '18 at 9:43
can someone help me?
– Sad Hyena
Nov 30 '18 at 9:31
add a comment |
1
do you have an actual question?
– Stultuske
Nov 23 '18 at 9:36
@Stultuske as I said, I want them to spawn in a circular area not in a rectangular area around the player
– Sad Hyena
Nov 23 '18 at 9:38
... still not a question. what exactly are you having problems with?
– Stultuske
Nov 23 '18 at 9:39
@Stultuske sorry, should have written this, I don't know how to spawn them in a circular area, the formulas that i posted may be useless for this purpose
– Sad Hyena
Nov 23 '18 at 9:43
can someone help me?
– Sad Hyena
Nov 30 '18 at 9:31
1
1
do you have an actual question?
– Stultuske
Nov 23 '18 at 9:36
do you have an actual question?
– Stultuske
Nov 23 '18 at 9:36
@Stultuske as I said, I want them to spawn in a circular area not in a rectangular area around the player
– Sad Hyena
Nov 23 '18 at 9:38
@Stultuske as I said, I want them to spawn in a circular area not in a rectangular area around the player
– Sad Hyena
Nov 23 '18 at 9:38
... still not a question. what exactly are you having problems with?
– Stultuske
Nov 23 '18 at 9:39
... still not a question. what exactly are you having problems with?
– Stultuske
Nov 23 '18 at 9:39
@Stultuske sorry, should have written this, I don't know how to spawn them in a circular area, the formulas that i posted may be useless for this purpose
– Sad Hyena
Nov 23 '18 at 9:43
@Stultuske sorry, should have written this, I don't know how to spawn them in a circular area, the formulas that i posted may be useless for this purpose
– Sad Hyena
Nov 23 '18 at 9:43
can someone help me?
– Sad Hyena
Nov 30 '18 at 9:31
can someone help me?
– Sad Hyena
Nov 30 '18 at 9:31
add a comment |
1 Answer
1
active
oldest
votes
It seems to be a math question.
Circle's formula is (x, y) = (cos(angle) * rX, sin(angle) * rY) + (centerX, centerY)
So, code will be look like this.
Random r = new Random();
double radius = r.nextFloat() * range; // or r.nextDouble()...
double angle = r.nextFloat() * 2.0f * Math.PI;
double randomDistanceLatitude = Math.cos(angle) * radius;
double randomDistanceLongitude = Math.sin(angle) * radius;
...
As lat lng is not in cartesian coordinate system, it's not a pure circle, but range is enough small in this use case to ignore such distortion, I think.
Additional notes.
If mMap means Google Maps map, you may have interests in Google Maps - Shape - Circle
answered Jan 27 at 12:47
TorisToris
1,630611
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53443991%2fhow-to-spawn-markers-on-android-map-inside-a-circular-range%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
It seems to be a math question.
Circle's formula is (x, y) = (cos(angle) * rX, sin(angle) * rY) + (centerX, centerY)
So, code will be look like this.
Random r = new Random();
double radius = r.nextFloat() * range; // or r.nextDouble()...
double angle = r.nextFloat() * 2.0f * Math.PI;
double randomDistanceLatitude = Math.cos(angle) * radius;
double randomDistanceLongitude = Math.sin(angle) * radius;
...
As lat lng is not in cartesian coordinate system, it's not a pure circle, but range is enough small in this use case to ignore such distortion, I think.
Additional notes.
If mMap means Google Maps map, you may have interests in Google Maps - Shape - Circle
answered Jan 27 at 12:47
TorisToris
1,630611
add a comment |
It seems to be a math question.
Circle's formula is (x, y) = (cos(angle) * rX, sin(angle) * rY) + (centerX, centerY)
So, code will be look like this.
Random r = new Random();
double radius = r.nextFloat() * range; // or r.nextDouble()...
double angle = r.nextFloat() * 2.0f * Math.PI;
double randomDistanceLatitude = Math.cos(angle) * radius;
double randomDistanceLongitude = Math.sin(angle) * radius;
...
As lat lng is not in cartesian coordinate system, it's not a pure circle, but range is enough small in this use case to ignore such distortion, I think.
Additional notes.
If mMap means Google Maps map, you may have interests in Google Maps - Shape - Circle
answered Jan 27 at 12:47
TorisToris
1,630611
add a comment |
It seems to be a math question.
Circle's formula is (x, y) = (cos(angle) * rX, sin(angle) * rY) + (centerX, centerY)
So, code will be look like this.
Random r = new Random();
double radius = r.nextFloat() * range; // or r.nextDouble()...
double angle = r.nextFloat() * 2.0f * Math.PI;
double randomDistanceLatitude = Math.cos(angle) * radius;
double randomDistanceLongitude = Math.sin(angle) * radius;
...
As lat lng is not in cartesian coordinate system, it's not a pure circle, but range is enough small in this use case to ignore such distortion, I think.
Additional notes.
If mMap means Google Maps map, you may have interests in Google Maps - Shape - Circle
answered Jan 27 at 12:47
TorisToris
1,630611
It seems to be a math question.
Circle's formula is (x, y) = (cos(angle) * rX, sin(angle) * rY) + (centerX, centerY)
So, code will be look like this.
Random r = new Random();
double radius = r.nextFloat() * range; // or r.nextDouble()...
double angle = r.nextFloat() * 2.0f * Math.PI;
double randomDistanceLatitude = Math.cos(angle) * radius;
double randomDistanceLongitude = Math.sin(angle) * radius;
...
As lat lng is not in cartesian coordinate system, it's not a pure circle, but range is enough small in this use case to ignore such distortion, I think.
Additional notes.
If mMap means Google Maps map, you may have interests in Google Maps - Shape - Circle
answered Jan 27 at 12:47
TorisToris
1,630611
edited Jan 27 at 14:28
answered Jan 27 at 12:47
TorisToris
1,630611
answered Jan 27 at 12:47
TorisToris
1,630611
answered Jan 27 at 12:47
TorisToris
1,630611
1,630611
add a comment |
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53443991%2fhow-to-spawn-markers-on-android-map-inside-a-circular-range%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
1
do you have an actual question?
– Stultuske
Nov 23 '18 at 9:36
@Stultuske as I said, I want them to spawn in a circular area not in a rectangular area around the player
– Sad Hyena
Nov 23 '18 at 9:38
... still not a question. what exactly are you having problems with?
– Stultuske
Nov 23 '18 at 9:39
@Stultuske sorry, should have written this, I don't know how to spawn them in a circular area, the formulas that i posted may be useless for this purpose
– Sad Hyena
Nov 23 '18 at 9:43
can someone help me?
– Sad Hyena
Nov 30 '18 at 9:31