Processing Forum

Two Ellipses That Determine The Size of One

[2 Replies]
- 25-Jan-2012 02:04 PM
- Forum: Programming Questions
This sketch has two ellipses; one (myBlue) that moves around the screen & another (myBlue2) that is controlled by the mouse. When they are touching, a new green circle will appear over the moving ellipse (myBlue). I would like the green ellipse's width/height to be determined by the ellipse controlled by the mouse. So, depending on the position of the mouse, the green ellipse will be wider or taller. I would like to have the two Blue ellipses inside the green ellipse at all times.

However, asking the green ellipse to get data from the x & y postion has been proving difficult since it will only grab a number & the size will not be relative to the actual positon of the two ellipses. For example, if the mouse controlled ellipse (myBlue2) is at x position 20, the green ellipse will be 20 pixels wide.

Maybe I've been staring at this too long but how do I determine my desired effect?

Should I be using a different function (beginShape?) or create another class?
2. Ellipse myBlue;
3. Ellipse myBlue2;
5. void setup() {
6. size(500, 500);
7. smooth();
8. myBlue = new Ellipse(25);
9. myBlue2 = new Ellipse(25);
10. }
12. void draw() {
13. background(255);
14. myBlue.display();
15. myBlue2.display();
16. myBlue.move();
17. myBlue2.control();
19. if(myBlue.intersect(myBlue2)) {
20. myBlue.highlight();
21. fill(0, 200, 67, 150);
22. //this is where the problem(???) is
23. ellipse(myBlue.xpos, myBlue.ypos, myBlue2.xpos+myBlue2.r, myBlue2.ypos);
24. }
25. else {
26. myBlue.display();
27. }
28. }
32. class Ellipse {
33. float r;
34. float xpos;
35. float ypos;
36. float speedX;
37. float speedY;
38. color c;
40. Ellipse(float tempR) {
41. xpos = width/2;
42. ypos = height/2;
43. speedX = random(-2, 2);
44. speedY = random(-2, 2);
45. r = tempR;
46. c = color(0, 45, 200);
47. }
49. void display() {
50. noStroke();
51. fill(c);
52. ellipseMode(CENTER);
53. ellipse(xpos, ypos, r*2, r*2);
54. stroke(0, 223, 0);
55. //line(xpos, ypos, xpos+25, ypos);
56. c = color(0, 45, 200);
57. }
59. void move() {
60. xpos += speedX;
61. ypos += speedY;
63. if(ypos > height || ypos < 0) {
64. speedY = speedY * -0.95;
65. }
67. if(xpos > width || xpos < 0) {
68. speedX = speedX * -0.95;
69. }
71. xpos = constrain(xpos,0,width);
72. ypos = constrain(ypos,0,height);
73. }
75. void control() {
76. xpos = mouseX;
77. ypos = mouseY;
78. xpos = constrain(xpos,0,width);
79. ypos = constrain(ypos,0,height);
80. }
82. void highlight() {
83. c = color(234, 0, 44);
84. }
86. boolean intersect(Ellipse myBlue2) {
87. float distance = dist(myBlue.xpos, myBlue.ypos, myBlue2.xpos, myBlue2.ypos);
88. if(distance < myBlue.r + myBlue2.r) {
89. return true;
90. }
91. else {
92. return false;
93. }
94. }
95. }

Two Ellipses as One - Objects as Arguments

[6 Replies]
- 21-Jan-2012 03:28 PM
- Forum: Programming Questions
My friend & I were working through this code but we're stumped.
We're trying to get 2 ellipses to become one. We know that it's easy to 'fake' it (say, two ellipses collide then create a new bigger ellipse) but we'd like to figure out how to actually make them join. Eventually we'd like to have an array of various sized ellipses that when they collide will stick together for a certain amount of time then break apart. It's sticking two objects together into one that has us stumped (lines 52-54). We're working it through with basic code now, & we have pseudocode at the part that's stumping us. Any help would be appreciated!
2. Ellipse myBob;
3. Ellipse myStan;
5. void setup() {
6. size(400, 400);
7. smooth();
8. myBob = new Ellipse(50, 50, 25);
9. myStan = new Ellipse(random(width), random(height), 50);
10. }
12. void draw() {
13. background(255);
14. myBob.display();
15. myBob.move();
16. myStan.display();
18. if(myBob.intersect(myStan)) {
19. myStan.highlight();
20. myBob.highlight();
21. }else {
22. myStan.display();
23. }
25. }
27. class Ellipse {
28. float r;
29. float x;
30. float y;
31. color c;
33. Ellipse(float tempX, float tempY, float tempR) {
34. r = tempR;
35. x = tempX;
36. y = tempY;
37. c = color(124, 0, 55);
38. }
40. void move() {
41. x = mouseX;
42. y = mouseY;
43. x = constrain(x,0,width);
44. y = constrain(y,0,height);
45. }
47. void highlight() {
48. c = color(0, 100, 100);
49. ellipse(x, y, r*4, r*2);
50. }
52. void appear() {
53. // make timer start;
54. //ellipse(leftmost side of bob, y, rightmost side of stan, y*r2);
55. }
57. void display() {
58. noStroke();
59. fill(c);
60. ellipseMode(CENTER);
61. ellipse(x, y, r*2, r*2);
62. c = color(124, 0, 55);
63. }
65. boolean intersect(Ellipse myStan) {
66. float distance = dist(myBob.x,myBob.y,myStan.x,myStan.y);
67. if(distance < r + myStan.r) {
68. //connect them
69. return true;
70. }
71. else {
72. //change it back
73. return false;
74. }
75. }
76. }

OpenCV Matching Faces Over Time - Face Comparison

[4 Replies]
- 08-Dec-2011 03:24 PM
- Forum: Contributed Library Questions
Hi everyone,

I'm trying to use Daniel Shiffman's Open CV Matching Faces Over Time for a project that compares when two people are close together. Would anyone know the best way to go about doing this?

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