processing/java/examples/Topics/Interaction/Reach2/Reach2.pde at master · whyi/processing · GitHub

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/**

* Reach 2

* based on code from Keith Peters.

* The arm follows the position of the mouse by

* calculating the angles with atan2().

int numSegments = 10;

float[] x = new float[numSegments];

float[] y = new float[numSegments];

float[] angle = new float[numSegments];

float segLength = 26;

float targetX, targetY;

void setup() {

size(640, 360);

strokeWeight(20.0);

stroke(255, 100);

x[x.length-1] = width/2; // Set base x-coordinate

y[x.length-1] = height; // Set base y-coordinate

}

void draw() {

background(0);

reachSegment(0, mouseX, mouseY);

for(int i=1; i<numSegments; i++) {

reachSegment(i, targetX, targetY);

}

for(int i=x.length-1; i>=1; i--) {

positionSegment(i, i-1);

}

for(int i=0; i<x.length; i++) {

segment(x[i], y[i], angle[i], (i+1)*2);

}

void positionSegment(int a, int b) {

x[b] = x[a] + cos(angle[a]) * segLength;

y[b] = y[a] + sin(angle[a]) * segLength;

}

void reachSegment(int i, float xin, float yin) {

float dx = xin - x[i];

float dy = yin - y[i];

angle[i] = atan2(dy, dx);

targetX = xin - cos(angle[i]) * segLength;

targetY = yin - sin(angle[i]) * segLength;

}

void segment(float x, float y, float a, float sw) {

strokeWeight(sw);

pushMatrix();

translate(x, y);

rotate(a);

line(0, 0, segLength, 0);

popMatrix();

}

processing/java/examples/Topics/Interaction/Reach2/Reach2.pde at master · whyi/processing · GitHub

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