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Program thumbnail for "{props.program.title}"

Title	Electromagnetic Field
ID	4930168058314752
Created	7 years ago, 1535901039755
Updated	7 years ago, 1535978006399
Code	// Right mouse button to move the second charge, any other mouse button to move the first. // All charges in format [x, y, charge] var charges = [ [100, 100, -12], [300, 300, 12], [100, 300, -2], [300, 100, 2] ]; // Pixel distance between adjacent vectors var spacing = 10; // Intensity multiplier var coefficient = pow(100, 2); // Maximum pixel distance past the canvas edge to place vectors var extra = 20; smooth(); strokeWeight(2.5); var drawField = function() { background(0); for (var x = -extra; x <= width + extra; x += spacing) { for (var y = -extra; y <= height + extra; y += spacing) { var m = 0; var x2 = x; var y2 = y; var net = 0; //if (mouseX !== x \|\| mouseY !== y) { for (var i = 0; i < charges.length; i++) { var c = charges[i]; var dx = c[0] - x; var dy = c[1] - y; var m = coefficient * c[2] / (dx * dx + dy * dy); net += m; if (x <= c[0]) { m = -1; } var a = atan(dy / dx); x2 += m cos(a); y2 += m * sin(a); } //} // net is not necessarily the length of the vector which is why // some very long ones are visible when you put two charges close together var a = 255 - abs(net) * 2; stroke(net > 0 ? color(255, 100, 100, a) : color(100, 100, 255, a) ); line(x, y, x2, y2); } } }; mousePressed = function() { var i = mouseButton === RIGHT ? 1 : 0; charges[i][0] = mouseX; charges[i][1] = mouseY; drawField(); }; mouseDragged = mousePressed; drawField();
Folds
Fork	false
Key	ag5zfmtoYW4tYWNhZGVteXIXCxIKU2NyYXRjaHBhZBiAgLKe4_7gCAw
Votes	176
Spin-Offs	10
Type	PJS
Width	400
Height	400
User Flagged	false
Origin Scratchpad	null
Hidden From Hotlist	false
Restricted Posting	false
By Child	false
Author Nick	Weather
Author Name	WeatherWonders
Author ID	kaid_854228745598935932978211
Author Profile Access	COACH

Archive Data

Added	10 months ago, 1739371776267
Updated	10 months ago, 1739371776267
Source Deleted	unknown