Processing Forum

Screen name:
ainsoph10
Blog:
http://www.mindgear.cc

ainsoph10's Profile

2 Posts

2 Responses

0 Followers

Activity Trend

Last 30 days

Loading Chart...

Show:

Expanded view
List view

Line Trail

[2 Replies]
- 08-Oct-2011 02:40 PM
- Forum: Programming Questions
I'm trying to do something like this effect (starting from 32 secs)

http://www.youtube.com/watch?v=dnImYYAwjD0

How can I make these trails for the lines on the planet? I made a simple test but the result is not even close to the one on the video. Do I have to write a shader to have this effect? My simple test is bellow. Thanks
2. Linetrail[] horizontal;
3. Linetrail[] vertical;
5. void setup()
6. {
7. size(800, 600);
9. int numberOfLines = 30;
10. int numberOfColumns = 40;
11. int offsetX = width / numberOfColumns;
12. int offsetY = height / numberOfLines;
14. vertical = new Linetrail[numberOfColumns];
15. for (int i = 0; i < vertical.length; i++)
16. {
17. vertical[i] = new Linetrail(i * offsetX, 0, i * offsetX, height);
18. }
20. horizontal = new Linetrail[numberOfLines];
21. for (int j = 0; j < horizontal.length; j++)
22. {
23. horizontal[j] = new Linetrail(0, j * offsetY, width, j * offsetY);
24. }
27. background(0);
28. }
30. void draw()
31. {
32. fill(0, 5);
33. noStroke();
34. rect(0, 0, width, height);
36. for (int i = 0; i < vertical.length; i++) vertical[i].update();
37. for (int j = 0; j < horizontal.length; j++) horizontal[j].update();
39. for (int i = 0; i < vertical.length; i++) vertical[i].render();
40. for (int j = 0; j < horizontal.length; j++) horizontal[j].render();
41. }
2. class Linetrail
3. {
4. private int startX, startY, endX, endY;
5. private int trailX, trailY;
6. private boolean vertical;
8. private int trailVel = 5;
9. private int trailSize = 25;
10. private int trailWeight = 3;
11. private color lineColor = #880000,
12. trailColor = #FF0000;
14. public Linetrail(int sx, int sy, int ex, int ey)
15. {
16. startX = sx;
17. startY = sy;
18. endX = ex;
19. endY = ey;
21. trailX = startX;
22. trailY = startY;
24. vertical = startX == endX ? true : false;
25. }
27. public void update()
28. {
29. if (vertical)
30. {
31. trailY += trailVel;
32. if (trailY < startY || trailY + trailSize > endY) trailVel *= -1;
33. }
34. else
35. {
36. trailX += trailVel;
37. if (trailX < startX || trailX + trailSize > endX) trailVel *= -1;
39. }
40. }
42. public void render()
43. {
44. strokeWeight(trailWeight);
45. stroke(lineColor);
46. line(startX, startY, endX, endY);
48. stroke(trailColor);
49. if (vertical)
50. {
51. line(trailX, trailY, trailX, trailY + trailSize);
52. }
53. else
54. {
55. line(trailX, trailY, trailX + trailSize, trailY);
56. }
57. }
58. }

Line segment Intersection

[4 Replies]
- 25-Aug-2011 07:33 PM
- Forum: Programming Questions
I'm doing an application that allows the user to use the mouse to draw orthogonal lines with the mouse. Every time the user turns 90 degrees, I store that point in a ArrayList and then draw lines between the points. The last line is draw between the last point and mouseX, mouseY (fig bellow). I need to know when this last line has crossed any of the other segments. Is there an easy way to do this other than computing each line equation based on its points?
Thanks in advance

«Prev
Next »