Processing Forum

How to create a PGraphics object and call createGraphics() in a library

[1 Reply]
- 08-Nov-2012 10:28 PM
- Forum: Library and Tool Development
I need to create a PGraphics object in a library I am developing and I am not able to figure it out. I can declare a PGraphics variable just fine but I do not understand how to call the createGraphics method.

GLGraphics: Can I control the individual point size in a GLModel POINT object?

[1 Reply]
- 19-Feb-2012 05:27 PM
- Forum: Contributed Library Questions
Hi,

I would like the individual points in my point cloud to each have different a size, and I would like to modify these sizes over time. All I could find was sys.setPointSize(float) but this applies to all the points. Can they be controlled individually?

How would I change opengl detail on an ellipse?

[0 Replies]
- 30-Nov-2011 04:06 PM
- Forum: Core Library Questions
I need a command like bezierDetail() or curveDetail(), but for the ellipse drawing command in GL. I have some pretty extreme transforms on it, and when it is drawn on screen, you can see the decimation. I need to subdivide it more but haven't been able to find a way.

flickr authorization through processing

[0 Replies]
- 07-Nov-2011 11:34 PM
- Forum: Share your Work
Hi all,

I'm posting this code here because I've been wanting to do this for a long time and had a very hard time figuring out how to get it to work. Hopefully, this will save others some time... It walks you through the steps needed to let a flickr user using your app tell flickr to authorize your app. Before you start, you need to create an app in flickr and paste the proper key and secret in the pde. After that, run the sketch. If you follow the printed directions, you should be good.
2. // -Log into flicker
3. // -Get an API key for a new app
4. // -Set the following variables appropriately
5. String SECRET = "paste the secret here";
6. String KEY = "paste the key here";
8. // Authorization variables
9. String frob;
10. String token = "paste the token you get from the first run here";
11. String search = "cars";
13. // Array list to hold flickr image URLs
14. ArrayList pix;
16. void setup() {
17. size(300, 300);
18. background(0);
19. smooth();
20. pix = new ArrayList();
22. println("If you need to go through the authorization process, press \"r\" to request a frob and print out the URL to the proper flickr page");
23. println("If your \"token\" variable is already set from pasting the value from previous runs of the sketch, press \"g\" to start the slide show\n");
24. noLoop();
25. }
27. void draw() {
28. background(0);
30. // if we have pictures to display
31. if (pix.size()>0) {
32. String pixURL = (String) pix.get(0);
33. pix.remove(0);
35. PImage img = loadImage(pixURL);
37. float x0=0, x1=width, y0=0, y1=width, ratio=img.width/float (img.height);
38. if (false) {
39. // fit smaller size
40. if (img.width>img.height) {
41. x0 = -(width-width/ratio)/2.0;
42. x1 = width*ratio;
43. }
44. else {
45. y0 = -(width-width*ratio)/2.0;
46. y1 = width/ratio;
47. }
48. }
49. else {
50. // fit wider size
51. if (img.width>img.height) {
52. y0 = (width-(width/ratio))/2;
53. y1 = width/ratio;
54. }
55. else {
56. x0 = (width-(width*ratio))/2;
57. x1 = width*ratio;
58. }
59. }
60. image(img, x0, y0, x1, y1);
61. }
62. }
64. void keyPressed() {
65. //Start the authorization process
66. if (key =='r') {
67. print("Requesting a frob\n...");
68. frob = getFrob();
69. println("DONE! frob is\n"+frob);
71. print("\nBuilding authorization URL from frob\n... ");
72. String authorizationURL = directFlickrToAskPermission(frob);
73. println("DONE! URL is:\n"+authorizationURL);
75. println("\nCut and paste the URL into your browser to authorize this app to talk to flick");
76. println("When you have authorized this app in flickr, hit the \"t\" key to request a token");
77. }
78. // Second part, after the authorization in flickr
79. else if (key == 't') {
80. print("\nRequesting a token\n... ");
81. token = getToken(frob);
82. println("DONE! token is: \n"+token);
83. println("\nIf you want to skip authorization next time you run the program,");
84. println("Copy the token string and paste it into the \"token\" variable declaration");
85. println("of this sketch.");
86. println("\nPress \"g\" to start the slide show");
87. }
88. // Strat the slide show
89. else if (key == 'g'){
90. groupSearch(search, token);
91. loop();
92. redraw();
93. }
94. }
97. String getHashString(String s) {
98. byte[] md5hash;
99. try {
100. java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
101. md.update(s.getBytes());
102. md5hash = md.digest();
103. }
104. catch(java.security.NoSuchAlgorithmException e) {
105. println(e.getMessage());
106. return null;
107. }
109. String hS = "";
110. for (int i=0; i<md5hash.length; i++) hS+=(hex(md5hash[i], 2));
111. return (hS.toLowerCase());
112. }
114. // this program asks flicker to request permission
115. String directFlickrToAskPermission(String _frob) {
116. HashMap params = new HashMap();
117. params.put("perms", "read");
118. params.put("api_key", KEY);
119. params.put("frob", _frob);
120. String url = buildAuthURL(params)+calcSig( SECRET, params);
121. return (url);
122. }
124. String getFrob() {
125. HashMap params = new HashMap();
126. params.put("method", "flickr.auth.getFrob");
127. params.put("api_key", KEY);
128. params.put("format", "rest");
129. String url = buildURL(params)+calcSig(SECRET, params);
131. XMLElement xml = new XMLElement(this, url);
132. String frob = xml.getChild(0).getContent();
133. if (frob == null) {
134. println(xml);
135. }
136. return (frob);
137. }
139. String getToken(String frob) {
140. HashMap params = new HashMap();
141. params.put("method", "flickr.auth.getToken");
142. params.put("api_key", KEY);
143. params.put("frob", frob);
144. String url = buildURL(params)+calcSig(SECRET, params);
145. XMLElement xml = new XMLElement(this, url);
146. String _token = xml.getChild(0).getChild(0).getContent();
147. return _token;
148. }
150. // returns
151. void groupSearch(String searchTerm, String token) {
152. HashMap params = new HashMap();
153. params.put("method", "flickr.groups.search");
154. params.put("text", searchTerm);
155. params.put("per_page", "5");
156. params.put("api_key", KEY);
157. params.put("auth_token", token);
158. String url = buildURL(params)+calcSig(SECRET, params);
159. XMLElement xml = new XMLElement(this, url);
160. int groupCount = xml.getChild(0).getChildCount();
161. for (int i=0; i<groupCount; i++) {
162. println("\ngetting photos from "+xml.getChild(0).getChild(i).getString("nsid")+" "+xml.getChild(0).getChild(i).getString("name"));
163. groupsPoolsGetPhotos(xml.getChild(0).getChild(i).getString("nsid"), token);
164. }
165. }
167. void groupsPoolsGetPhotos(String groupID, String token) {
168. HashMap params = new HashMap();
169. params.put("method", "flickr.groups.pools.getPhotos");
170. params.put("group_id", groupID);
171. params.put("api_key", KEY);
172. params.put("auth_token", token);
173. String url = buildURL(params)+calcSig(SECRET, params);
174. XMLElement xmlPool = new XMLElement(this, url);
175. println(xmlPool.getChild(0).getChildCount());
176. for (int i=0;i<xmlPool.getChild(0).getChildCount(); i++) {
177. pix.add(getImageFromElement(xmlPool.getChild(0).getChild(i)));
178. }
179. }
181. String getImageFromElement(XMLElement e) {
182. String fm = e.getStringAttribute("farm");
183. String sv = e.getStringAttribute("server");
184. String id = e.getStringAttribute("id");
185. String sc = e.getStringAttribute("secret");
186. String url = "http://farm"+fm+".static.flickr.com/"+ sv + "/" + id + "_" + sc + "_z.jpg";
188. return url;
189. }
191. // calc signature from secret and hash map of params and values
192. String calcSig(String secret, HashMap params) {
193. String sig = secret;
194. ArrayList keys = new ArrayList(params.keySet());
195. Collections.sort(keys);
196. for (int i=0; i<keys.size();i++) {
197. String k = (String) keys.get(i);
198. sig += (k+(String) params.get(k));
199. }
200. return getHashString(sig);
201. }
203. String buildURL(HashMap params) {
204. String url="http://flickr.com/services/rest?";
205. ArrayList keys = new ArrayList(params.keySet());
206. Collections.sort(keys);
207. for (int i=0; i<keys.size();i++) {
208. String k = (String) keys.get(i);
209. url += (k+"="+(String) params.get(k));
210. url += "&";
211. }
212. url += "api_sig=";
213. return url;
214. }
216. String buildAuthURL(HashMap params) {
217. String url="http://flickr.com/services/auth?";
218. ArrayList keys = new ArrayList(params.keySet());
219. Collections.sort(keys);
220. for (int i=0; i<keys.size();i++) {
221. String k = (String) keys.get(i);chrom
222. url += (k+"="+(String) params.get(k));
223. url += "&";
224. }
225. url += "api_sig=";
226. return url;
227. }

processing slower on ubuntu than win7

[8 Replies]
- 16-Jan-2011 07:22 PM
- Forum: Integration and Hardware
Hi all,

This may be more a java question than a processing issue, but I am deciding on an OS for some generative art displays. I am using some atom 330/ION nettops and finding that similar sketches are about twice as fast on win7 than they are on ubuntu (same machine). I am using processing1.2.1, the official sun version of java, the latest nvidia drivers.

I don't want to have to use win7 for this project but the speed different is significant enough that I may have to. Can anyone shed any light on this?

Help needed with function pointers / anonymous classes?

[3 Replies]
- 30-Sep-2010 11:45 AM
- Forum: Programming Questions
I have a polygon which I am duplicating x number of times according to arbitrary rule. Ideally, I would just like to have an ArrayList with each element being a function pointer to the transform I want to apply. Unfortunately, from what I can tell trying and failing to figure it on my own, java's implementation is not that straight forward. I gather I need to use anonymous classes but I'm not sure how to get it to work.

Here's some pseudo code:

void setup() {
size(400,400);

// define a polygon
PVector[] verts = { new PVector(0,0),new PVector(50,0),new PVector(25,50)};

// I have my transforms as strings, but ideally, they would be function definitions
ArrayList xform = new ArrayList();
xform.add("translate(50,50)");
xform.add("combo(-100,0,PI*.333)");
xform.add("scale(2,1)");

// draw my original triagle
drawIt(verts);

//apply the first transform and draw
xform.get(0); // this would apply the transform
drawIt(verts);

//apply the second transform and draw
xform.get(1);
drawIt(verts);

//apply the third transform and draw
xform.get(2);
drawIt(verts);
}

void drawIt(PVector[] prim) {
beginShape();
vertex(prim[0].x,prim[0].y);
vertex(prim[1].x,prim[1].y);
vertex(prim[2].x,prim[2].y);
endShape(CLOSE);
resetMatrix();
}

void combo(float x, float y, float rot){
translate(x,y);
rotate(rot);
}

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