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A loading spinner for Processing 3.3.7
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// A loading spinner. | |
// By @marcedwards from @bjango. | |
void setup() { | |
size(300, 300, P2D); | |
frameRate(30); | |
smooth(8); | |
noFill(); | |
stroke(255); | |
strokeWeight(6); | |
} | |
void draw() { | |
background(29); | |
drawArc(8); | |
} | |
void drawArc(int endoffset) { | |
float a = easeInOutN(timeCycle(40, 0), 4); | |
float b = easeInOutN(timeCycle(40, endoffset), 5); | |
float r = timeCycle(40, 0); | |
if (a > b) { | |
b++; | |
} | |
pushMatrix(); | |
translate(width / 2, height / 2); | |
rotate(TAU * 0.75); | |
arc(0, 0, 100, 100, | |
a * TAU * 0.8 + r * TAU * 0.2 - 0.3, | |
b * TAU * 0.8 + r * TAU * 0.2 + 0.3 | |
); | |
popMatrix(); | |
} | |
float easeInOutN(float t, float power) { | |
return t<0.5 ? 0.5*pow(2*t, power) : 1-0.5*pow(2*(1-t), power); | |
} | |
float timeCycle(int totalframes, int offset) { | |
return float((frameCount + offset) % totalframes) / float(totalframes); | |
} |
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