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Change Rotation Point From 0,0 to 200, 200 on a 400x400 screen

[3 Replies]
- 24-Dec-2011 06:52 PM
- Forum: Programming Questions
1. Hi guys, new to the forum. Ive been doing a lot of Arduino stuff, but this is my first Processing projects. I am planning on doing a digital dash for one of my cars, with a VGA to Arduino interface. Right now Im working on one guage at a time. I need to find a way to set different center points for each guage needle for the rotation. Ive read that I have to translate the needle to 0,0, do the rotation, then translate them back to their original position. Im going to have about 12 needles on the dash, this seems like it would take up a bit of CPU power. Is there an easier way? Ive attatched my code for both the SIN-COS calculated needles, and the "rotate" calculated needles. Any help would be appreciated. Thanks, Jesse.
Click Here to Watch Video
2. // MPH Gauge Trials 1
3. // SIN and COS calcualtions
5. import processing.serial.*;
7. float val;
8. float val1;
9. int mph = 0;
10. String arduinoPort = Serial.list()[1];
11. float easing = 0.05;
12. int easedVal;
13. Serial port;
14. float angle = 0.0;
15. float offset = 200;
16. float scalar = 150;
17. float speed = 0;
21. void setup() {
22. size(400,400);
23. textSize(26);
24. smooth();
25. port = new Serial(this, arduinoPort, 9600);
26. }
28. void draw(){
29. // background ();
30. if ( port.available() > 0) { // If data is available,
31. val = port.read(); // read it and store it in val
32. background(150);
33. val1 = map(val, 0, 255, 12, 35); // Convert the values, sets needle max and min
34. }
36. //NEEDLE SWEEP CALCULATIONS
37. float x1 = offset + cos(angle) * scalar;
38. float y1 = offset + sin(angle) * scalar;
39. fill(255, 0, 0);
40. triangle( 195, 200, 205, 200, x1, y1); //NEEDLE CENTER POINT AND SWEEP
41. angle = val1 / 5; //SWEEP ADJUST
42. float mph = map(val, 0, 255, 0, 180);
43. int mph1 = round(mph);
44. fill(0,0,0);
45. textAlign(CENTER);
46. text(mph1, 200, 245);
47. text("MPH", 200, 275);
48. }
rotate calculations
2. //rotate calculator
5. import processing.serial.*;
7. float val;
8. float val1;
9. int mph = 0;
10. String arduinoPort = Serial.list()[1];
11. float easing = 0.05;
12. int easedVal;
13. Serial port;
14. float angle = 0.0;
15. float offset = 200;
16. float scalar = 150;
17. float speed = 0;
21. void setup() {
22. size(400,400);
23. textSize(26);
24. smooth();
25. port = new Serial(this, arduinoPort, 9600);
26. }
28. void draw(){
29. // background ();
30. if ( port.available() > 0) { // If data is available,
31. val = port.read(); // read it and store it in val
32. background(150);
33. val1 = map(val, 0, 255, 12, 35); // Convert the values, sets needle max and min
34. }
36. //text labels
37. float mph = map(val, 0, 255, 0, 180);
38. int mph1 = round(mph);
39. fill(0,0,0);
40. textAlign(CENTER);
41. text(mph1, 200, 245);
42. text("MPH", 200, 275);
44. //NEEDLE SWEEP CALCULATIONS
45. //float x1 = offset + cos(angle) * scalar;
46. //float y1 = offset + sin(angle) * scalar;
49. fill(255, 0, 0);
50. rotate(angle);
51. triangle( 195, 200, 205, 200, 200, 50); //NEEDLE CENTER POINT AND SWEEP
52. angle = val1 / 5; //SWEEP ADJUST
54. }

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