Processing Forum

Mind controlled scalextric

[0 Replies]
- 28-Sep-2011 01:09 PM
- Forum: Share your Work
Using processing + arduino and a neurosky headset users can control the speed of a scalextric car depending on there levels of attention or meditation.

The mind controlled scalextric doesn't start till about half way through but it's not a long video and there is a really cool openframeworks 3D projection mapped game at the start.

http://vimeo.com/29493716

Update object color depending on mouse position

[3 Replies]
- 01-Sep-2011 03:42 AM
- Forum: Programming Questions
I have a bezier with rectangles draw along its points, and what I would like to do is change the color of these rectangles as the dial points to them. This piece of code I have wrote changes the color of the rectangle the dial points to however I would like it to also keep the color the same for all of the rectangles that the dial has past, and then reset if the dial goes back down. The dials rotation is determined to the mouseX position.

I realise that is a bit of an odd explanation so please ask questions if you don't quite understand what I am trying to do.
2. void setup() {
3. size(500, 500);
4. smooth();
5. background(0);
6. }
8. void draw() {
9. noFill();
10. noStroke();
11. bezier(85, 20, 50, 50, 50, 20, 20, 20);
12. fill(0);
13. stroke(57, 181, 74);
14. int steps = 90;
15. rectArray();
16. int mrot = round(map(mouseX, 0, 500, 0, 180));
17. float marot = round(mrot/2);
19. if (marot <= steps) {
20. //
21. float t = marot / float(steps);
22. float x = bezierPoint(10, 10, 490, 490, t);
23. float y = bezierPoint(485, 200, 200, 485, t);
25. pushMatrix();
26. translate(x,y);
27. int rot = round(map(x, 10, 490, 0, 180));
28. float arot = radians(rot);
29. rotate(arot);
30. fill(57, 181, 74);
31. rect(0, 0, 25, 2);
32. popMatrix();
33. noStroke();
34. fill(0,0,0,25);
35. rect(0,0,500,500);
36. }
38. dial();
39. }
42. void dial() {
43. pushMatrix();
44. translate(250,485);
45. fill(0);
46. noStroke();
47. ellipse(0, 15, 400, 400);
48. fill(255,255,255);
49. int mrot = round(map(mouseX, 0, 500, 0, 180));
50. float marot = radians(mrot);
51. rotate(marot);
52. quad(0, 10, -192, 0, 0, -10, 10, 0);
53. popMatrix();
55. }
58. void rectArray() {
59. int steps = 90;
60. for (int i = 0; i <= steps; i++) {
61. float t = i / float(steps);
62. float x = bezierPoint(10, 10, 490, 490, t);
63. float y = bezierPoint(485, 200, 200, 485, t);
65. pushMatrix();
66. translate(x,y);
67. int rot = round(map(x, 10, 490, 0, 180));
68. float arot = radians(rot);
69. rotate(arot);
70. fill(0);
71. rect(0, 0, 25, 2);
72. popMatrix();
73. }
74. }
I don't know if the best way to achieve the outcome I want would be through the use of arrays or another method so I am open to all suggestions.

Thank you
Liam

JSON Array

[16 Replies]

04-Feb-2011 04:31 AM
Forum: Contributed Library Questions

I am able to pull in the JSON data I require using a weather API from worldweatheronline.com, however what im am now trying to do is access individual parts of the JSON object. I think the reason for me not being able to select it is because the array is embed in an array. For example i want to be able to printin the swellHeight_m and swellDir, I have included my code below and the JSON output.

import org.json.*;
String apiKey = "***************";
String baseURL = "http://www.worldweatheronline.com/feed/marine.ashx?q=54.13,5.50&format=json&key=";
void setup() {
getMarineData();
};
void draw() {
};
void getMarineData(){
String requests = baseURL + apiKey;
String result = join(loadStrings(requests), "");
println(result);
int test = 100;
println (test);
try {
JSONObject seaData = new JSONObject(join(loadStrings(requests), ""));
JSONArray weather = seaData.getJSONArray("weather");
int date = seaData.getInt("date");
println (date);
}
catch (JSONException e) {
println ("error");
};
};

The JSON data that im trying to brake down is:

{ "data": { "nearest_area": [ {"distance_miles": "22.2", "latitude": "54.000", "longitude": "6.000" } ], "request": [ {"query": "Lat 54.13 and Lon 5.50", "type": "LatLon" } ], "weather": [ {"date": "2011-02-04", "hourly": [ {"cloudcover": "100", "humidity": "95", "precipMM": "2.4", "pressure": "1010", "sigHeight_m": "2.9", "swellDir": "250", "swellHeight_m": "1.5", "swellPeriod_secs": "8.0", "tempC": "6", "tempF": "43", "time": "0", "visibility": "9", "waterTemp_C": "4", "waterTemp_F": "39", "weatherCode": "296", "weatherIconUrl": [ {"value": "http:\/\/www.worldweatheronline.com\/images\/wsymbols01_png_64\/wsymbol_0017_cloudy_with_light_rain.png" } ], "winddir16Point": "SSW", "winddirDegree": "211", "windspeedKmph": "72", "windspeedMiles": "45" }, {"cloudcover": "100", "humidity": "95", "precipMM": "3.8", "pressure": "1007", "sigHeight_m": "3.5", "swellDir": "280", "swellHeight_m": "2.6", "swellPeriod_secs": "17.2", "tempC": "5", "tempF": "42", "time": "300", "visibility": "7", "waterTemp_C": "4", "waterTemp_F": "39", "weatherCode": "302", "weatherIconUrl": [ {"value": "http:\/\/www.worldweatheronline.com\/images\/wsymbols01_png_64\/wsymbol_0018_cloudy_with_heavy_rain.png" } ], "winddir16Point": "SW", "winddirDegree": "229", "windspeedKmph": "70", "windspeedMiles": "43" }, {"cloudcover": "75", "humidity": "95", "precipMM": "0.5", "pressure": "1008", "sigHeight_m": "3.4", "swellDir": "290", "swellHeight_m": "2.8", "swellPeriod_secs": "17.2", "tempC": "5", "tempF": "41", "time": "600", "visibility": "5", "waterTemp_C": "4", "waterTemp_F": "39", "weatherCode": "263", "weatherIconUrl": [ {"value": "http:\/\/www.worldweatheronline.com\/images\/wsymbols01_png_64\/wsymbol_0009_light_rain_showers.png" } ], "winddir16Point": "WSW", "winddirDegree": "243", "windspeedKmph": "62", "windspeedMiles": "38" }, {"cloudcover": "79", "humidity": "96", "precipMM": "0.3", "pressure": "1008", "sigHeight_m": "3.0", "swellDir": "290", "swellHeight_m": "2.5", "swellPeriod_secs": "17.2", "tempC": "6", "tempF": "43", "time": "900", "visibility": "2", "waterTemp_C": "4", "waterTemp_F": "39", "weatherCode": "266", "weatherIconUrl": [ {"value": "http:\/\/www.worldweatheronline.com\/images\/wsymbols01_png_64\/wsymbol_0017_cloudy_with_light_rain.png" } ], "winddir16Point": "SW", "winddirDegree": "235", "windspeedKmph": "52", "windspeedMiles": "32" }, {"cloudcover": "100", "humidity": "95", "precipMM": "1.9", "pressure": "1005", "sigHeight_m": "3.0", "swellDir": "280", "swellHeight_m": "2.4", "swellPeriod_secs": "17.2", "tempC": "8", "tempF": "46", "time": "1200", "visibility": "9", "waterTemp_C": "4", "waterTemp_F": "39", "weatherCode": "296", "weatherIconUrl": [ {"value": "http:\/\/www.worldweatheronline.com\/images\/wsymbols01_png_64\/wsymbol_0017_cloudy_with_light_rain.png" } ], "winddir16Point": "SW", "winddirDegree": "232", "windspeedKmph": "58", "windspeedMiles": "36" }, {"cloudcover": "74", "humidity": "93", "precipMM": "0.5", "pressure": "1004", "sigHeight_m": "3.8", "swellDir": "280", "swellHeight_m": "2.9", "swellPeriod_secs": "17.2", "tempC": "8", "tempF": "47", "time": "1500", "visibility": "5", "waterTemp_C": "4", "waterTemp_F": "39", "weatherCode": "263", "weatherIconUrl": [ {"value": "http:\/\/www.worldweatheronline.com\/images\/wsymbols01_png_64\/wsymbol_0009_light_rain_showers.png" } ], "winddir16Point": "SW", "winddirDegree": "234", "windspeedKmph": "71", "windspeedMiles": "44" }, {"cloudcover": "12", "humidity": "92", "precipMM": "0.0", "pressure": "1004", "sigHeight_m": "4.0", "swellDir": "280", "swellHeight_m": "3.1", "swellPeriod_secs": "16.0", "tempC": "8", "tempF": "46", "time": "1800", "visibility": "10", "waterTemp_C": "4", "waterTemp_F": "39", "weatherCode": "113", "weatherIconUrl": [ {"value": "http:\/\/www.worldweatheronline.com\/images\/wsymbols01_png_64\/wsymbol_0001_sunny.png" } ], "winddir16Point": "SW", "winddirDegree": "235", "windspeedKmph": "75", "windspeedMiles": "46" }, {"cloudcover": "34", "humidity": "92", "precipMM": "0.0", "pressure": "1004", "sigHeight_m": "4.0", "swellDir": "290", "swellHeight_m": "3.2", "swellPeriod_secs": "16.0", "tempC": "7", "tempF": "44", "time": "2100", "visibility": "10", "waterTemp_C": "4", "waterTemp_F": "39", "weatherCode": "116", "weatherIconUrl": [ {"value": "http:\/\/www.worldweatheronline.com\/images\/wsymbols01_png_64\/wsymbol_0002_sunny_intervals.png" } ], "winddir16Point": "WSW", "winddirDegree": "238", "windspeedKmph": "71", "windspeedMiles": "44" } ], "maxtempC": "8", "mintempC": "5" } ] }}

Im sorry about the volume of JSON data, i would really appreciate any help you could give on this. Thank you

Liam

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