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--- skriptsose2020:code-beispiele_aus_den_vorlesungnsvideos_sose2020 [2020/04/29 20:34]
d.golovko
+++ skriptsose2020:code-beispiele_aus_den_vorlesungnsvideos_sose2020 [2020/06/18 01:10] (aktuell)
d.golovko
@@ Zeile 1: / Zeile 1: @@
 ====Code-Beispiele aus den Vorlesungsvideos SoSe2020=====
-==Woche 2: Rekapitulation Woche 1 und Start in die Woche 2==
+===Woche 2: Rekapitulation Woche 1 und Start in die Woche 2===
 <hidden Strings>
 <code java>
@@ Zeile 35: / Zeile 35: @@
 \\
-==Woche 2: Arrays==
+===Woche 2: Arrays===
 <hidden Code>
 <code java>
@@ Zeile 79: / Zeile 79: @@
 \\
-==Woche 2: Schleifen==
+===Woche 2: Schleifen===
 <hidden while und for>
 <code java>
@@ Zeile 217: / Zeile 217: @@
 </hidden>
 \\
-==Woche 2: Methoden===
+===Woche 2: Methoden====
 <hidden Beispeiele von Methoden>
@@ Zeile 268: / Zeile 268: @@
 void greet() {
   println("Hallo Welt");
+}
+</code>
+</hidden>
+\\
+===Woche 3: Steuerung eines zweirädigen Roboters===
+<hidden Über globale Variablen>
+<code java>
+float posX = 300; // x coordinate of the circle center
+float posY = 200; // y coordinate of the circle center
+float angle = PI/4; // current direction of the robot
+final int RADIUS = 50; // radius of the robot
+void setup() {
+  size(600, 400);
+}
+void draw() {
+  background(200);
+  show();
+  move(4);
+  turn(0.05);
+}
+// Turns the robot by the given angle value
+void turn(float angleDiff) {
+  angle = angle + angleDiff;
+}
+// Moves the robot forward by the given distance
+void move(float distance) {
+  posX = posX + distance * cos(angle);
+  posY = posY + distance * sin(angle);
+}
+// Draws the robot
+void show() {
+  circle(posX, posY, RADIUS*2);
+  line(posX, posY, posX + RADIUS * cos(angle), posY + RADIUS * sin(angle));
+}
+</code>
+</hidden>
+\\
+===Woche 3: Klassen===
+<hidden Haupt-Sketch>
+<code java>
+Robot robot1; // large robot
+Robot robot2; // small robot
+void setup() {
+  size(600, 400);
+  robot1 = new Robot(300, 200, PI/4, 50);
+  robot2 = new Robot(500, 200, PI, 20);
+}
+void draw() {
+  background(200);
+  robot1.show();
+  robot2.show();
+  robot1.move(4);
+  robot1.turn(0.05);
+  robot2.move(2);
+  float distance = robot1.calculateDistance(robot2);
+  if (distance <= 0) {
+  // dies ist anders als im Vorlesungs-Video, weil die Radienlängen in der Methode calculateDistance() abgezogen werden
+    robot1.turn(PI);
+    robot2.turn(PI);
+  }
+}
+</code>
+</hidden>
+<hidden Klasse Robot>
+<code java>
+class Robot {
+  // 1. Attribute
+  float posX; // x coordinate of the circle center
+  float posY; // y coordinate of the circle center
+  float angle; // current direction of the robot
+  int radius; // radius of the robot
+  // 2. Konstruktor, x: x coordinate of the center, y: y coordinate of the center, direction: where the roboter is looking towards, size: radius of the robot
+  Robot(float posX, float posY, float direction, int size) {
+    this.posX = posX;
+    this.posY = posY;
+    this.angle = direction;
+    this.radius = size;
+  }
+  // 3. Methoden
+  // Turns the robot by the given angle value
+  void turn(float angleDiff) {
+    this.angle = this.angle + angleDiff;
+  }
+  // Moves the robot forward by the given distance
+  void move(float distance) {
+    posX = posX + distance * cos(angle);
+    posY = posY + distance * sin(angle);
+  }
+  // Draws the robot
+  void show() {
+    circle(posX, posY, radius*2);
+    line(posX, posY, posX + radius * cos(angle), posY + radius * sin(angle));
+  }
+  // Calculates distance from this robot to the other
+  float calculateDistance(Robot other) {
+    float deltaX = this.posX - other.posX;
+    float deltaY = this.posY - other.posY;
+    float distance = sqrt(deltaX*deltaX + deltaY*deltaY);
+    return distance - this.radius - other.radius; // dies ist anders als im Vorlesungs-Video
+  }
+}
+</code>
+</hidden>
+\\
+===Woche 4: Bibliotheken===
+{{anchor:woche4}}
+<hidden Video-Bibliothek: Abzug des Hintergrunds>
+<code java>
+/**
+ * Background Subtraction
+ * by Golan Levin.
+ *
+ * Detect the presence of people and objects in the frame using a simple
+ * background-subtraction technique. To initialize the background, press a key.
+ */
+import processing.video.*;
+int numPixels;
+int[] backgroundPixels;
+Capture video;
+void setup() {
+  size(640, 480);
+  // This the default video input, see the GettingStartedCapture
+  // example if it creates an error
+  //video = new Capture(this, 160, 120);
+  String[] cameras = Capture.list();
+  video = new Capture(this, cameras[0]);
+  // Start capturing the images from the camera
+  video.start();
+  numPixels = video.width * video.height;
+  // Create array to store the background image
+  backgroundPixels = new int[numPixels];
+  // Make the pixels[] array available for direct manipulation
+  loadPixels();
+}
+void draw() {
+  if (video.available()) {
+    video.read(); // Read a new video frame
+    video.loadPixels(); // Make the pixels of video available
+    // Difference between the current frame and the stored background
+    int presenceSum = 0;
+    for (int i = 0; i < numPixels; i++) { // For each pixel in the video frame...
+      // Fetch the current color in that location, and also the color
+      // of the background in that spot
+      color currColor = video.pixels[i];
+      color bkgdColor = backgroundPixels[i];
+      // Extract the red, green, and blue components of the current pixel's color
+      int currR = (currColor >> 16) & 0xFF;
+      int currG = (currColor >> 8) & 0xFF;
+      int currB = currColor & 0xFF;
+      // Extract the red, green, and blue components of the background pixel's color
+      int bkgdR = (bkgdColor >> 16) & 0xFF;
+      int bkgdG = (bkgdColor >> 8) & 0xFF;
+      int bkgdB = bkgdColor & 0xFF;
+      // Compute the difference of the red, green, and blue values
+      int diffR = abs(currR - bkgdR);
+      int diffG = abs(currG - bkgdG);
+      int diffB = abs(currB - bkgdB);
+      // Add these differences to the running tally
+      presenceSum += diffR + diffG + diffB;
+      // Render the difference image to the screen
+      pixels[i] = color(diffR, diffG, diffB);
+      // The following line does the same thing much faster, but is more technical
+      //pixels[i] = 0xFF000000 | (diffR << 16) | (diffG << 8) | diffB;
+    }
+    updatePixels(); // Notify that the pixels[] array has changed
+    println(presenceSum); // Print out the total amount of movement
+  }
+}
+// When a key is pressed, capture the background image into the backgroundPixels
+// buffer, by copying each of the current frame's pixels into it.
+void keyPressed() {
+  video.loadPixels();
+  arraycopy(video.pixels, backgroundPixels);
+}
+</code>
+</hidden>
+<hidden OpenCV: Gesichtserkennung>
+<code java>
+import gab.opencv.*;
+import java.awt.Rectangle;
+import processing.video.*;
+OpenCV opencv;
+Rectangle[] faces;
+Capture video;
+void setup() {
+  size(640, 480);
+  video = new Capture(this, Capture.list()[0]);
+  opencv = new OpenCV(this, width, height);
+  opencv.loadCascade(OpenCV.CASCADE_FRONTALFACE);
+  video.start();
+}
+void draw() {
+  video.read();
+  opencv.loadImage(video);
+  image(video, 0, 0); // display a video frame on the drawing canvas
+  noFill();
+  stroke(0, 255, 0);
+  strokeWeight(3);
+  Rectangle[] faces = opencv.detect();
+  for (int i = 0; i < faces.length; i++) {
+    rect(faces[i].x, faces[i].y, faces[i].width, faces[i].height);
+  }
+}
+</code>
+</hidden>
+<hidden Bildverarbeitung: Kantendetektion>
+<code java>
+import gab.opencv.*;
+import processing.video.*;
+OpenCV opencv;
+Capture video;
+void setup() {
+  size(640, 480);
+  video = new Capture(this, Capture.list()[0]);
+  opencv = new OpenCV(this, width, height);
+  video.start();
+}
+void draw() {
+  video.read(); // read current video frame
+  opencv.loadImage(video); // and load it into the opencv object
+  opencv.findCannyEdges(20, 75); // find edges
+  PImage canny = opencv.getSnapshot(); // get the black-and-white resulting image
+  image(canny, 0, 0); // display the image on the drawing canvas
+}
+</code>
+</hidden>
+<hidden Bildverarbeitung: Hough-Transformation>
+<code java>
+import gab.opencv.*;
+import processing.video.*;
+OpenCV opencv;
+Capture video;
+void setup() {
+  size(640, 480);
+  video = new Capture(this, Capture.list()[0]);
+  opencv = new OpenCV(this, width, height);
+  video.start();
+}
+void draw() {
+  video.read(); // read current video frame
+  opencv.loadImage(video); // and load it into the opencv object
+  opencv.findCannyEdges(20, 75); // find edges
+  opencv.getSnapshot(); // get the black-and-white resulting image
+  image(video, 0, 0); // display the video frame on the drawing canvas
+  // Find lines with Hough line detection
+  // Arguments are: threshold, minLength, maxLineGap
+  ArrayList<Line> lines = opencv.findLines(100, 30, 20);
+  for (Line line : lines) {
+    // lines include angle in radians, measured in double precision
+    // so we can select out vertical and horizontal lines
+    // They also include "start" and "end" PVectors with the position
+    if (line.angle >= radians(0) && line.angle < radians(1)) {
+      stroke(0, 255, 0);
+      line(line.start.x, line.start.y, line.end.x, line.end.y);
+    }
+    if (line.angle > radians(89) && line.angle < radians(91)) {
+      stroke(255, 0, 0);
+      line(line.start.x, line.start.y, line.end.x, line.end.y);
+    }
+  }
 }
 </code>
 </hidden>

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