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| - | <title>Clock \ Examples \ Processing.org</title>
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| - | within the context of the electronic arts.">
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| - | <div class="examples-nav"><a href="https://www.processing.org/examples/"><img src="./Clock Examples Processing.org_files/back_off.gif" alt="Back to List"> <span class="back-to">Back To List</span></a>
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| - | <p class="ref-notice">
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| - | This example is for Processing 2+. If you have a previous version, use the examples included with your software. If you see any errors or have suggestions, <a href="https://github.com/processing/processing-docs/issues?state=open">please let us know</a>.
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| - | </p>
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| - | <div class="example"><script type="application/processing">
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| - | int cx, cy;
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| - | float secondsRadius;
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| - | float minutesRadius;
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| - | float hoursRadius;
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| - | float clockDiameter;
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| - |
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| - | void setup() {
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| - | size(640, 360);
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| - | stroke(255);
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| - |
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| - | int radius = min(width, height) / 2;
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| - | secondsRadius = radius * 0.72;
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| - | minutesRadius = radius * 0.60;
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| - | hoursRadius = radius * 0.50;
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| - | clockDiameter = radius * 1.8;
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| - |
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| - | cx = width / 2;
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| - | cy = height / 2;
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| - | }
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| - |
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| - | void draw() {
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| - | background(255, 0, 0);
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| - |
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| - | // Draw the clock background
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| - | fill(80);
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| - | noStroke();
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| - | ellipse(cx, cy, clockDiameter, clockDiameter);
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| - |
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| - | // Angles for sin() and cos() start at 3 o'clock;
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| - | // subtract HALF_PI to make them start at the top
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| - | float s = map(second(), 0, 60, 0, TWO_PI) - HALF_PI;
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| - | float m = map(minute() + norm(second(), 0, 60), 0, 60, 0, TWO_PI) - HALF_PI;
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| - | float h = map(hour() + norm(minute(), 0, 60), 0, 24, 0, TWO_PI * 2) - HALF_PI;
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| - |
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| - | // Draw the hands of the clock
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| - | stroke(255);
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| - | strokeWeight(1);
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| - | line(cx, cy, cx + cos(s) * secondsRadius, cy + sin(s) * secondsRadius);
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| - | strokeWeight(2);
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| - | line(cx, cy, cx + cos(m) * minutesRadius, cy + sin(m) * minutesRadius);
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| - | strokeWeight(4);
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| - | line(cx, cy, cx + cos(h) * hoursRadius, cy + sin(h) * hoursRadius);
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| - |
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| - | // Draw the minute ticks
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| - | strokeWeight(2);
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| - | beginShape(POINTS);
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| - | for (int a = 0; a < 360; a+=6) {
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| - | float angle = radians(a);
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| - | float x = cx + cos(angle) * secondsRadius;
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| - | float y = cy + sin(angle) * secondsRadius;
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| - | vertex(x, y);
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| - | }
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| - | endShape();
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| - | }
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| - | </script><canvas width="640" height="360" tabindex="0" id="__processing0" style="image-rendering: -webkit-optimize-contrast !important;"></canvas>
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| - | <p class="doc"><strong>Clock.</strong> <br>
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| - | <br>
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| - | The current time can be read with the second(), minute(), and hour() functions. In this example, sin() and cos() values are used to set the position of the hands.</p>
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| - |
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| - | <pre class="code">
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| - | int cx, cy;
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| - | float secondsRadius;
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| - | float minutesRadius;
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| - | float hoursRadius;
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| - | float clockDiameter;
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| - |
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| - | void setup() {
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| - | size(640, 360);
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| - | stroke(255);
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| - |
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| - | int radius = min(width, height) / 2;
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| - | secondsRadius = radius * 0.72;
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| - | minutesRadius = radius * 0.60;
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| - | hoursRadius = radius * 0.50;
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| - | clockDiameter = radius * 1.8;
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| - |
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| - | cx = width / 2;
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| - | cy = height / 2;
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| - | }
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| - |
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| - | void draw() {
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| - | background(0);
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| - |
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| - | // Draw the clock background
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| - | fill(80);
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| - | noStroke();
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| - | ellipse(cx, cy, clockDiameter, clockDiameter);
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| - |
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| - | // Angles for sin() and cos() start at 3 o'clock;
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| - | // subtract HALF_PI to make them start at the top
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| - | float s = map(second(), 0, 60, 0, TWO_PI) - HALF_PI;
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| - | float m = map(minute() + norm(second(), 0, 60), 0, 60, 0, TWO_PI) - HALF_PI;
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| - | float h = map(hour() + norm(minute(), 0, 60), 0, 24, 0, TWO_PI * 2) - HALF_PI;
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| - |
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| - | // Draw the hands of the clock
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| - | stroke(255);
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| - | strokeWeight(1);
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| - | line(cx, cy, cx + cos(s) * secondsRadius, cy + sin(s) * secondsRadius);
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| - | strokeWeight(2);
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| - | line(cx, cy, cx + cos(m) * minutesRadius, cy + sin(m) * minutesRadius);
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| - | strokeWeight(4);
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| - | line(cx, cy, cx + cos(h) * hoursRadius, cy + sin(h) * hoursRadius);
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| - |
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| - | // Draw the minute ticks
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| - | strokeWeight(2);
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| - | beginShape(POINTS);
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| - | for (int a = 0; a < 360; a+=6) {
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| - | float angle = radians(a);
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| - | float x = cx + cos(angle) * secondsRadius;
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| - | float y = cy + sin(angle) * secondsRadius;
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| - | vertex(x, y);
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| - | }
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| - | endShape();
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| - | }
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| - | </pre>
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| - |
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| - | <div id="copyright">Processing was initiated by <a href="http://benfry.com/">Ben Fry</a> and <a href="http://reas.com/">Casey Reas</a>. It is developed by a <a href="https://www.processing.org/people/">small team of volunteers</a>.</div>
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