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Add rudimentary mouse click repel/attract #4

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Add rudimentary mouse click repel/attract #4

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37 changes: 36 additions & 1 deletion src/Universe.js
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,8 @@ class Universe {
this.friction = 0;
this.flatForce = false;
this.wrap = false;

this.mouseForce = {x: null, y: null, forceLevel: null};
}

reSeed(
Expand Down Expand Up @@ -117,7 +119,16 @@ class Universe {
for (let i = 0; i < this.particles.length; ++i) {
// Current particle
const p = this.particles[i];

if (this.mouseForce.x !== null && this.mouseForce.y !== null) {
const repelRadius = 40;
const r_x = p.x - this.mouseForce.x;
const r_y = p.y - this.mouseForce.y;

if (Math.sqrt(Math.pow(r_x,2) + Math.pow(r_y, 2)) < repelRadius) {
p.vx += this.mouseForce.forceLevel / r_x;
p.vy += this.mouseForce.forceLevel / r_y;
}
}
// Interactions
for (let j = 0; j < this.particles.length; ++j) {
// Other particle
Expand Down Expand Up @@ -310,6 +321,30 @@ class Universe {
console.log('');
}
}

startRepelling(x, y) {
this.mouseForce.x = x;
this.mouseForce.y = y;
this.mouseForce.forceLevel = 5;
}

startAttracting(x, y) {
this.mouseForce.x = x;
this.mouseForce.y = y;
this.mouseForce.forceLevel = -1;
}

stopRepelling() {
this.mouseForce.x = null;
this.mouseForce.y = null;
this.mouseForce.forceLevel = null;
}

stopAttracting() {
this.mouseForce.x = null;
this.mouseForce.y = null;
this.mouseForce.forceLevel = null;
}
}

module.exports = Universe;
19 changes: 19 additions & 0 deletions src/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -107,6 +107,25 @@ const sketch = ({ width, height }) => {
width,
height
);

document.oncontextmenu = function(e){
return false;
}

window.addEventListener('mousedown', event => {
event.preventDefault();
if (event.which === 1) universe.startRepelling(event.pageX, event.pageY);
if (event.which === 3) universe.startAttracting(event.pageX, event.pageY);
});

window.addEventListener('mouseup', event => {
event.preventDefault();
if (event.which === 1) universe.stopRepelling();
if (event.which === 3) universe.stopAttracting();

});


universe.wrap = universeSettings.wrap;
universe.reSeed(
universeSettings.attractMean,
Expand Down