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codeduder

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how to detect mouse move direction?

[10 Replies]
- 09-Aug-2010 12:43 PM
- Forum: Programming Questions
is it possible to detect the mouse move direction? (like form left to right, or right to left)

i guess maybe there is something with:
1. float dir = dist(mouseX, mouseY, pmouseX, pmouseY);
thanks

basic object question

[4 Replies]
- 06-Aug-2010 03:34 AM
- Forum: Programming Questions
i used to programm in flash, and i am new to processing.
my main-understanding-question in processing is:

if i create objects to the stage, how can i call them? (like instances)

for example i have a array of objects like this:
2. int numSpots = 10;
4. Spot[] spots = new Spot[numSpots];
6. void setup() {
7. size(450,150);
8. smooth();
9. background(0);
11. for (int i = 0; i < spots.length; i++) {
12. float x = (40 + 5)*i;
13. spots[i] = new Spot(x);
14. }
15. }
17. class Spot {
18. float x;
20. Spot(float xpos) {
21. x = xpos;
22. fill(255,10);
23. rect(x, 0, 40, 150);
24. }
25. }
now as an example i like to do a MouseRollover, and print the objects instance ( the "i" nr) by rollover an object.
like this:
1. print("im over" + i);

fadeOut class

[2 Replies]
- 27-Jul-2010 04:36 AM
- Forum: Programming Questions
i try do make a simple fadeOut Class, but with my sketch it goes to fast!
how i can add a fade-speed-parameter to my class to control the fadeSpeed?
2. FadeOut spot;
4. void setup() {
5. size(500,500);
6. background(2);
7. spot = new FadeOut();
9. frameRate(1);
10. }
13. class FadeOut {
15. FadeOut() {
17. background(120, 0);
18. for(int i=255;i>0;i--) {
19. fill(255, 255, 255, i);
20. print(i);
21. }
22. rect(125, 125, 250,250);
23. }
25. }

midi keyboard / noteOn & noteOff: shape fade out

[2 Replies]
- 17-Jul-2010 08:30 AM
- Forum: Programming Questions
i draw with the midi keyboard shapes like this:
2. void noteOn(Note note, int device, int channel){
3. int vel = note.getVelocity();
4. int pit = note.getPitch();
5. println(pit);
6. fill(255, _alpha);
7. rect((pit-48)*40, 0, 40, 150);
8. }
now i would like to do a alpha-fade for out by the noteOff-Event
2. void noteOff(Note note, int device, int channel){
3. int pit = note.getPitch();
4. fill(255, 0);
5. }
logically this script does not work

how i have to work out this? (maybe with OOP?)

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