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| − | <processingjs> // All Examples Written by Casey Reas and Ben Fry
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| − | // unless otherwise stated.
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| − |
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| − | // center point
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| − |
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| − | float centerX = 0, centerY = 0;
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| − |
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| − | float radius = 45, rotAngle = -90;
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| − | float accelX, accelY;
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| − | float springing = .0085, damping = .98;
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| − |
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| − | //corner nodes
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| − | int nodes = 5;
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| − | float nodeStartX[] = new float[nodes];
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| − | float nodeStartY[] = new float[nodes];
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| − | float[]nodeX = new float[nodes];
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| − | float[]nodeY = new float[nodes];
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| − | float[]angle = new float[nodes];
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| − | float[]frequency = new float[nodes];
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| − | // soft-body dynamics
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| − | float organicConstant = 1;
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| − | void setup() {
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| − | size(800, 600);
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| − | //center shape in window
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| − | centerX = width/2;
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| − | centerY = height/2;
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| − | // iniitalize frequencies for corner nodes
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| − | for (int i=0; i<nodes; i++){
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| − | frequency[i] = random(5, 12);
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| − | }
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| − |
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| − | noStroke();
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| − | smooth();
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| − | frameRate(30);
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| − | }
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| − | void draw() {
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| − | //fade background
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| − |
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| − | fill(0, 100);
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| − | rect(0,0,width, height);
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| − |
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| − | drawShape();
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| − | moveShape();
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| − | }
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| − | void drawShape() {
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| − |
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| − | // calculate node starting locations
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| − | for (int i=0; i<nodes; i++){
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| − | nodeStartX[i] = centerX+cos(radians(rotAngle))*radius;
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| − | nodeStartY[i] = centerY+sin(radians(rotAngle))*radius;
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| − | rotAngle += 360.0/nodes;
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| − | }
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| − |
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| − | // draw polygon
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| − | curveTightness(organicConstant);
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| − | fill(255);
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| − |
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| − | beginShape();
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| − | for (int i=0; i<nodes; i++){
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| − | curveVertex(nodeX[i], nodeY[i]);
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| − | }
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| − | for (int i=0; i<nodes-1; i++){
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| − | curveVertex(nodeX[i], nodeY[i]);
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| − | }
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| − | endShape(CLOSE);
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| − | }
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| − | void moveShape() {
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| − | //move center point
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| − | float deltaX = mouseX-centerX;
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| − |
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| − | float deltaY = mouseY-centerY;
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| − | // create springing effect
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| − | deltaX *= springing;
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| − |
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| − | deltaY *= springing;
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| − |
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| − | accelX += deltaX;
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| − |
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| − | accelY += deltaY;
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| − |
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| − | // move predator's center
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| − | centerX += accelX;
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| − |
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| − | centerY += accelY;
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| − | // slow down springing
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| − | accelX *= damping;
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| − | accelY *= damping;
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| − | // change curve tightness
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| − | organicConstant = 1-((abs(accelX)+abs(accelY))*.1);
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| − |
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| − | //move nodes
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| − | for (int i=0; i<nodes; i++){
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| − | nodeX[i] = nodeStartX[i]+sin(radians(angle[i]))*(accelX*2);
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| − |
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| − | nodeY[i] = nodeStartY[i]+sin(radians(angle[i]))*(accelY*2);
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| − | angle[i]+=frequency[i];
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| − |
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| − | }
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| − |
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| − | }
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| − |
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| − | </processingjs>
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