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How to draw polygons on an HTML5 canvas?
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Create a path with moveTo and lineTo (live demo):
var ctx = canvas.getContext('2d');
ctx.fillStyle = '#f00';
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(100,50);
ctx.lineTo(50, 100);
ctx.lineTo(0, 90);
ctx.closePath();
ctx.fill();
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How to add an extra column to a NumPy array
...([[1, 2, 3],
[2, 3, 4]])
>>> z = np.zeros((2,1), dtype=int64)
>>> z
array([[0],
[0]])
>>> np.append(a, z, axis=1)
array([[1, 2, 3, 0],
[2, 3, 4, 0]])
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ImportError: No module named pip
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64
the question is about installing on Mac.
– Corey Goldberg
May 25 '17 at 2:14
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Convert an image to grayscale in HTML/CSS
...ing back to color, IE 10/11 support with SVG, and partial grayscale in the demo.
img.grayscale {
/* Firefox 10+, Firefox on Android */
filter: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg'><filter id='grayscale'><feColorMatrix type='matrix' values='0.3333 0...
Understanding Apache's access log
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And what does
"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.5 Safari/535.19" means ?
This is the value of User-Agent, the browser identification string.
For this reason, most Web browsers use a User-Agent string value as...
How do I create a unique ID in Java? [duplicate]
...String toIDString(long i) {
char[] buf = new char[32];
int z = 64; // 1 << 6;
int cp = 32;
long b = z - 1;
do {
buf[--cp] = DIGITS66[(int)(i & b)];
i >>>= 6;
} while (i != 0);
return new String(buf, cp, (32-cp));
}
...
Inputting a default image in case the src attribute of an html is not valid?
...rgs error guard
Updated: CSS only solution
I recently saw Vitaly Friedman demo a great CSS solution I wasn't aware of. The idea is to apply the content property to the broken image. Normally :after or :before do not apply to images, but when they're broken, they're applied.
<img src="nothere.jp...
How to convert a byte array to a hex string in Java?
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A Guava solution, for completeness:
import com.google.common.io.BaseEncoding;
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byte[] bytes = "Hello world".getBytes(StandardCharsets.UTF_8);
final String hex = BaseEncoding.base16().lowerCase().encode(bytes);
Now hex is "48656c6c6f20776f726c64".
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Comet implementation for ASP.NET? [closed]
...simple example of a Long Polling Chat Server using MVC 3 Async Controllers based on a great article by Clay Lenhart
You can use the example on a AppHarbor deployment I set up based on the source from the BitBucket project.
Also, more information available from my blog post explaining the project.
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Do declared properties require a corresponding instance variable?
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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