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February 4, 2020 07:35
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Implementaion of Bresenham Line drawing algorithm in p5.js
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| function setup() { | |
| createCanvas(400, 400); | |
| } | |
| function drawLine(x0, y0, x1, y1, freq) { | |
| var dx = abs(x1 - x0); | |
| var sx = x0 < x1? 1: -1; | |
| var dy = -abs(y1 - y0) | |
| var sy = y0 < y1? 1: -1 | |
| var err = dx + dy | |
| var i = 0; | |
| while(true) { | |
| if(freq(i++)){ | |
| point(x0, y0) | |
| } | |
| if (x0 == x1 && y0 == y1) | |
| break; | |
| var e2 = 2 * err; | |
| if (e2 >= dy) { | |
| err += dy; /* e_xy + e_x > 0 */ | |
| x0 += sx; | |
| } | |
| if (e2 <= dx) { /* e_xy + e_y < 0 */ | |
| err += dx; | |
| y0 += sy; | |
| } | |
| } | |
| } | |
| function dotfreq(freq) { | |
| return function(i) { | |
| return i % freq == 0; | |
| } | |
| } | |
| function dashedfreq (a, b) { | |
| } | |
| function draw() { | |
| background(220); | |
| drawLine(80, 0, 100, 100, dotfreq(1)) | |
| drawLine(0, 100, 100, 100, dotfreq(1)) | |
| drawLine(300, 80, 200, 100, dotfreq(2)) | |
| drawLine(200, 0, 200, 100, dotfreq(1)) | |
| drawLine(100, 200, 0, 220, dotfreq(3)) | |
| drawLine(100, 200, 100, 300, dotfreq(1)) | |
| drawLine(200, 200, 220, 300, dotfreq(4)) | |
| drawLine(200, 200, 300, 200, dotfreq(1)) | |
| drawLine(10, 310, 60, 310, dotfreq(1)) | |
| drawLine(10, 360, 60, 360, dotfreq(1)) | |
| drawLine(10, 310, 10, 360, dotfreq(1)) | |
| drawLine(60, 310, 60, 360, dotfreq(1)) | |
| drawLine(70+10, 310, 90+60, 310, dotfreq(1)) | |
| drawLine(70+10, 360, 90+60, 360, dotfreq(1)) | |
| drawLine(70+10, 310, 70+10, 360, dotfreq(1)) | |
| drawLine(90+60, 310, 90+60, 360, dotfreq(1)) | |
| drawLine(100+70+10, 360, 100+90+60, 360, dotfreq(1)) | |
| drawLine(100+70+10, 310, 100+70+10, 360, dotfreq(1)) | |
| drawLine(100+70+10, 310, 100+90+60, 360, dotfreq(1)) | |
| } | |
| // https://imgur.com/a/37TBAnf |
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