GMU:Actors, Traces, Collectives/SS17/Tracking: Difference between revisions

GMU:Actors, Traces, Collectives/SS17/Tracking (view source)

Revision as of 14:28, 24 June 2017

2,234 bytes added , 24 June 2017

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Veja6203

513

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 <syntaxhighlight lang="javaScript">
+import processing.video.*;
+Capture video;
+int x, y;
+Mover [] mover = new Mover [20];
+void setup() {
+  size(640, 480);
+  video = new Capture(this, width, height);
+  video.start();
+  for (int i = 0; i < mover.length; i++) {
+    mover [i]=new Mover ();
+  }
+}
+void draw() {
+  if (video.available()) {
+    video.read();
+    image(video, 0, 0, width, height);
+    int brightestX = 0; // X-coordinate of the brightest video pixel
+    int brightestY = 0; // Y-coordinate of the brightest video pixel
+    float brightestValue = 0; // Brightness of the brightest video pixel
+    video.loadPixels();
+    int index = 0;
+    for (int y = 0; y < video.height; y++) {
+      for (int x = 0; x < video.width; x++) {
+        int pixelValue = video.pixels[index];
+        float pixelBrightness = brightness(pixelValue);
+        if (pixelBrightness > brightestValue) {
+          brightestValue = pixelBrightness;
+          brightestY = y;
+          brightestX = x;
+        }
+        index++;
+      }
+    }
+    for (int j = 0; j < mover.length; j++) {
+      // Update the position
+      mover[j].update(brightestX, brightestY);
+      // Display the Mover
+      mover[j].display();
+    }
+  }
+}
+// The Nature of Code
+// Daniel Shiffman
+// http://natureofcode.com
+class Mover {
+  // The Mover tracks position, velocity, and acceleration
+  PVector position;
+  PVector velocity;
+  PVector dir;
+  // The Mover's maximum speed
+  float topspeed;
+  Mover() {
+    // Start in the center
+    position = new PVector(width/2,height/2);
+    velocity = new PVector(0,0);
+    topspeed = 5;
+  }
+  void update(float x, float y) {
+    // Compute a vector that points from position to mouse
+    PVector mouse = new PVector(x,y);
+    PVector dir = PVector.sub(mouse,position);
+    // Set magnitude of acceleration
+    dir.setMag(0.3);
+    // Velocity changes according to acceleration
+    velocity.add(dir);
+    // Limit the velocity by topspeed
+    velocity.limit(topspeed);
+    // position changes by velocity
+    position.add(velocity);
+  }
+  void display() {
+    stroke(0);
+    strokeWeight(2);
+    //fill(127);
+    //ellipse(position.x,position.y,48,48);
+    line (position.x,position.y, position.x+velocity.x,position.y+velocity.y);
+  }
+}
 </syntaxhighlight>