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script.js
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script.js
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drawThing = function(client, context, thing, vertexes, scale, contextFn) {
var start = vertexes[0];
context.beginPath();
context.moveTo(thing.x + (start[0] * scale), thing.y + (start[1] * scale));
for (var i = 0; i < vertexes.length; i++) {
var vertex = vertexes[i];
context.lineTo(thing.x + (vertex[0] * scale), thing.y + (vertex[1] * scale));
}
context.lineTo(thing.x + (start[0] * scale), thing.y + (start[1] * scale));
context[contextFn]();
context.closePath();
}
drawThing2 = function(client, context, thing, vertexes, scale, contextFn) {
var start = vertexes[0];
context.beginPath();
context.moveTo((start[0] * scale), (start[1] * scale));
for (var i = 0; i < vertexes.length; i++) {
var vertex = vertexes[i];
context.lineTo((vertex[0] * scale),(vertex[1] * scale));
}
context.lineTo((start[0] * scale),(start[1] * scale));
context[contextFn]();
context.closePath();
}
strokeT = function(client, context, thing, vertexes, scale) {
drawThing(client, context, thing, vertexes, scale, 'stroke');
}
strokeT2 = function(client, context, thing, vertexes, scale) {
drawThing2(client, context, thing, vertexes, scale, 'stroke');
}
fillT = function(client, context, thing, vertexes, scale) {
drawThing(client, context, thing, vertexes, scale, 'fill');
}
fillT2 = function(client, context, thing, vertexes, scale) {
drawThing2(client, context, thing, vertexes, scale, 'fill');
}
usingGamepad = function(input) {
return (input.x < 0 || input.y > 0 || input.x > 0 || input.y < 0 || input.buttons[0].pressed || input.buttons[1].pressed || input.buttons[2].pressed || input.buttons[3].pressed || input.buttons[4].pressed || input.buttons[5].pressed || input.buttons[8].pressed || input.buttons[9].pressed || input.buttons[12].pressed || input.buttons[13].pressed || input.buttons[14].pressed || input.buttons[15].pressed);
}
interpolateGamepad = function(input) {
var x = input.x;
var y = input.y;
var sum = Math.abs(x) + Math.abs(y);
if (sum <= 0) {
return input;
}
if (sum < 1.732050808) {
return {'x' : x, 'y': y, 'buttons' : input.buttons };
}
var xRatio = Math.abs(x) / sum;
var yRatio = Math.abs(y) / sum;
x = xRatio * x;
y = yRatio * y;
return {'x' : x, 'y': y, 'buttons' : input.buttons };
}
getDistance = function(a, b) {
var x = ((a.x - b.x) * (a.x - b.x));
var y = ((a.y - b.y) * (a.y - b.y));
if (x + y == 0){
return 0;
}
return Math.sqrt((x+y));
}
polygonContainsPoint = function(point, vs) {
// ray-casting algorithm based on
// http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html
var x = point['x'];
var y = point['y'];
if (x > vs[0][0] + 56 || x < vs[0][0] - 56 || y > vs[0][1] + 56 || y < vs[0][1] - 56) {
return false;
}
var inside = false;
for (var i = 0, j = vs.length - 1; i < vs.length; j = i++) {
var xi = vs[i][0], yi = vs[i][1];
var xj = vs[j][0], yj = vs[j][1];
var intersect = ((yi > y) != (yj > y))
&& (x < (xj - xi) * (y - yi) / (yj - yi) + xi);
if (intersect) {
inside = !inside;
}
}
return inside;
};
wrapText = function(context, text, x, y, maxWidth, lineHeight) {
var words = text.split(' ');
var line = '';
for (var n = 0; n < words.length; n++) {
var testLine = line + words[n] + ' ';
var metrics = context.measureText(testLine);
var testWidth = metrics.width;
if (testWidth > maxWidth && n > 0) {
context.fillText(line, x, y);
line = words[n] + ' ';
y += lineHeight;
} else {
line = testLine;
}
}
context.fillText(line, x, y);
}
dw = function(x) {
return x / Thing.fw * Thing.cw;
}
dh = function(y) {
return y / Thing.fh * Thing.ch;
this.fh * this.ch;
}
rotate_point = function(pointX, pointY, originX, originY, angle) {
angle = angle * Math.PI / 180.0;
return {
x: Math.cos(angle) * (pointX-originX) - Math.sin(angle) * (pointY-originY) + originX,
y: Math.sin(angle) * (pointX-originX) + Math.cos(angle) * (pointY-originY) + originY
};
}
applyThrust = function(thing) {
var origin = {'x' : thing.x, 'y': thing.y};
var tp = [thing.x, thing.y - 1];
var np = rotate_point(tp[0], tp[1], origin.x, origin.y, thing.r);
thing.mx = np.x - thing.x;
thing.my = np.y - thing.y;
thing.x = thing.x + thing.mx * thing.grab('thruster').power;
thing.y = thing.y + thing.my * thing.grab('thruster').power;
}
applyThrust2 = function(thing) {
var origin = {'x' : thing.x, 'y': thing.y};
var tp = [thing.x, thing.y - 1];
var np = rotate_point(tp[0], tp[1], origin.x, origin.y, thing.r);
thing.mx = np.x - thing.x;
thing.my = np.y - thing.y;
thing.x = thing.x + thing.mx * thing.thrustPower();
thing.y = thing.y + thing.my * thing.thrustPower();
}
lateralMove = function(thing) {
var total = Math.abs(thing.mx) + Math.abs(thing.my);
if (total <= 0) {
return;
}
var xx = thing.mx / total * thing.speedMod();
var yy = thing.my / total * thing.speedMod();
var sum = Math.abs(xx) + Math.abs(yy);
if (sum < 1.732050808) {
xx = thing.mx * thing.speedMod();
yy = thing.my * thing.speedMod();
}
thing.x = thing.x + xx * thing.speed;
thing.y = thing.y + yy * thing.speed;
}
pointArrayRotated = function(points, angle, origin) {
for (var i = 0; i < points.length; i++){
var p = points[i];
var rotated = rotate_point(p[0], p[1], origin.x, origin.y, angle);
points[i] = [rotated.x, rotated.y];
}
return points;
}