Files
CrivitzDerby/background.js

73 lines
1.9 KiB
JavaScript

const fencePostGap = 200;
let fenceOffset = fencePostGap;
function drawRaceBackground(ctx, width, height, horseSize){
// Create gradient
const grd = ctx.createRadialGradient( width /2, height/2, 0.000, width/2, height/2, width/2);
// Add colors
grd.addColorStop(0.101, 'rgba(255, 255, 255, 1.000)');
grd.addColorStop(1.000, 'rgba(116, 224, 224, 1.000)');
// Fill with gradient
ctx.fillStyle = grd;
ctx.fillRect(0, 0, width, height);
ctx.fillStyle = '#CD853F';
ctx.fillRect(0, height - (2 * horseSize) , width, height);
ctx.fillStyle = '#32CD32';
ctx.fillRect(0, height - (2.4 * horseSize) , width, horseSize/2);
const fenceline = ( height - (2 * horseSize));
drawGuides(ctx, width, height, horseSize, fenceline);
drawFence(ctx, width, fenceline, horseSize );
}
function drawGuides(ctx, width, height, horseSize, fenceline){
ctx.fillStyle = "#000000";
ctx.beginPath();
ctx.moveTo(0, height - (horseSize/2));
ctx.lineTo(width, height - (horseSize/2));
ctx.stroke();
ctx.beginPath();
ctx.moveTo(0, height - (horseSize));
ctx.lineTo(width, height - (horseSize));
ctx.stroke();
ctx.beginPath();
ctx.moveTo(0, height - (horseSize * 1.5));
ctx.lineTo(width, height - (horseSize * 1.5));
ctx.stroke();
}
function drawFence(ctx, width, fenceline, horseSize) {
ctx.fillStyle = '#322e1b';
const postHeight = (horseSize /2);
const postTop = fenceline - postHeight;
for (let x = fenceOffset; x < width; x+=fencePostGap) {
const postStart = x;
ctx.fillStyle = '#322e1b';
ctx.fillRect(postStart, postTop , 7, postHeight);
}
ctx.fillStyle = "#000000";
ctx.beginPath();
ctx.moveTo(0, postTop);
ctx.lineTo(width, postTop);
ctx.stroke();
fenceOffset -=5;
if (fenceOffset < 0) { fenceOffset = fencePostGap};
}