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Pan / Zoom P5.js
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| <html> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <script language="javascript" type="text/javascript" src="libraries/p5.js"></script> | |
| <script language="javascript" type="text/javascript" src="PanZoomP5js.js"></script> | |
| <!-- This line removes any default padding and style. | |
| You might only need one of these values set. --> | |
| <style> body {padding: 0; margin: 0;} </style> | |
| </head> | |
| <body> | |
| </body> | |
| </html> |
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| //Zoom/Pan Component | |
| //by Rick Companje, Nov 1, 2018. | |
| //Enjoy! | |
| var img; | |
| var w, h, tow, toh; | |
| var x, y, tox, toy; | |
| var zoom = .01; //zoom step per mouse tick | |
| function preload() { | |
| img = loadImage("https://i.imgur.com/9dbblSn.jpg"); | |
| } | |
| function setup() { | |
| createCanvas(windowWidth, windowHeight); | |
| w = tow = img.width; | |
| h = toh = img.height; | |
| x = tox = w / 2; | |
| y = toy = h / 2; | |
| } | |
| function draw() { | |
| background(0); | |
| //tween/smooth motion | |
| x = lerp(x, tox, .1); | |
| y = lerp(y, toy, .1); | |
| w = lerp(w, tow, .1); | |
| h = lerp(h, toh, .1); | |
| image(img, x-w/2, y-h/2, w, h); | |
| } | |
| function mouseDragged() { | |
| tox += mouseX-pmouseX; | |
| toy += mouseY-pmouseY; | |
| } | |
| function mouseWheel(event) { | |
| var e = -event.delta; | |
| if (e>0) { //zoom in | |
| for (var i=0; i<e; i++) { | |
| if (tow>30*width) return; //max zoom | |
| tox -= zoom * (mouseX - tox); | |
| toy -= zoom * (mouseY - toy); | |
| tow *= zoom+1; | |
| toh *= zoom+1; | |
| } | |
| } | |
| if (e<0) { //zoom out | |
| for (var i=0; i<-e; i++) { | |
| if (tow<width) return; //min zoom | |
| tox += zoom/(zoom+1) * (mouseX - tox); | |
| toy += zoom/(zoom+1) * (mouseY - toy); | |
| toh /= zoom+1; | |
| tow /= zoom+1; | |
| } | |
| } | |
| } |
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