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smooth sky color transition

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koehr 2018-05-17 00:51:50 +02:00
parent e7cd369b63
commit faa605e836
1 changed files with 12 additions and 9 deletions
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21
src/solar-quartet.js
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@ -49,16 +49,19 @@ export default function drawFrame (canvas, ctx, width, height, grCanvas, grCtx,
// Paint the sky
const skyGradient = ctx.createLinearGradient(0, 0, 0, height)
if (sunY > -25) { // night
skyGradient.addColorStop(0, '#001') // slight blue hue
skyGradient.addColorStop(.7, '#004') // but mainly black
} else if (sunY < -70) { // day
skyGradient.addColorStop(0, '#79F') // blue with a light gradient
skyGradient.addColorStop(.7, '#33A') // into more blue
} else { // dawn / sunset
const skyHue = 360 + sunY
const skySaturation = 100 + sunY
const skyLightness = Math.min(sunY * -1 - 10, 55)
const skyHSLTop = `hsl(220, 70%, ${skyLightness}%)`
const skyHSLBottom = `hsl(${skyHue}, ${skySaturation}%, ${skyLightness}%)`
skyGradient.addColorStop(0, skyHSLTop)
skyGradient.addColorStop(.7, skyHSLBottom)
/*
skyGradient.addColorStop(0, '#2a3e55') // Blueish at the top.
skyGradient.addColorStop(.7, '#8d4835') // Reddish at the bottom.
}
*/
ctx.fillStyle = skyGradient
ctx.fillRect(0, 0, width, height)
@ -73,8 +76,8 @@ export default function drawFrame (canvas, ctx, width, height, grCanvas, grCtx,
// Draw 4 layers of mountains.
for(let i = 0; i < 4; i++) {
// Set the main canvas fillStyle to a shade of brown with variable lightness
// (darker at the front)
// Set the main canvas fillStyle to a shade of green-brown with variable lightness
// depending on sunY and depth
if (sunY > -25) { // night
ctx.fillStyle = `hsl(5, 23%, ${4-i}%)`
} else if (sunY < -70) { // day (TODO)