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style: lighten web LIGHTS arc rendering

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This commit is contained in:
OpenAI Codex
2026-09-21 19:39:10 +08:00
parent 8f50799a26
commit dcc55aba5c
1 changed files with 12 additions and 4 deletions
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16
web/kyushu_compare.html
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@@ -513,7 +513,8 @@ function prepareLightArcCanvas(){
function canvasArcAngle(degrees,bearing){
return (degrees + bearing - 90) * Math.PI / 180;
}
function drawCaArc(ctx,x,y,radius,startDeg,endDeg,bearing,color,width){
function drawCaArc(ctx,x,y,radius,startDeg,endDeg,bearing,color,width,alpha){
ctx.save();
ctx.beginPath();
ctx.arc(
x,y,radius,
@@ -522,9 +523,11 @@ function drawCaArc(ctx,x,y,radius,startDeg,endDeg,bearing,color,width){
false
);
ctx.strokeStyle=color;
ctx.globalAlpha=alpha==null?1:alpha;
ctx.lineWidth=width;
ctx.lineCap="butt";
ctx.stroke();
ctx.restore();
}
function drawCaLeg(ctx,x,y,length,degrees,bearing){
@@ -535,7 +538,8 @@ function drawCaLeg(ctx,x,y,length,degrees,bearing){
ctx.moveTo(x,y);
ctx.lineTo(x+length*Math.cos(angle),y+length*Math.sin(angle));
ctx.strokeStyle=CA_COLOR.CHBLK;
ctx.lineWidth=2;
ctx.globalAlpha=0.82;
ctx.lineWidth=1.35;
ctx.stroke();
ctx.restore();
}
@@ -570,8 +574,12 @@ function drawLightArcFeature(ctx,feature,bearing,width,height){
if(end<=start)end+=360;
const arcColor=CA_COLOR[args.length>=8?args[2]:props.s52_arc_color] || CA_COLOR.CHMGD;
const outlineColor=CA_COLOR[args.length>=8?args[0]:props.s52_arc_outline_color] || CA_COLOR.OUTLW;
drawCaArc(ctx,point.x,point.y,radius,start,end,bearing,outlineColor,metrics.arcWidth+metrics.outlineWidth);
drawCaArc(ctx,point.x,point.y,radius,start,end,bearing,arcColor,metrics.arcWidth);
// Keep the S-52 CA radius/angles intact, but map millimetre pen widths to a
// lighter screen preview. Raw OUTLW=4 can otherwise dominate the chart.
const visualArcWidth=Math.max(1.6,Math.min(3.0,metrics.arcWidth*0.90));
const visualOutlineExtra=Math.max(2.6,Math.min(4.2,metrics.outlineWidth*0.38));
drawCaArc(ctx,point.x,point.y,radius,start,end,bearing,outlineColor,visualArcWidth+visualOutlineExtra,0.88);
drawCaArc(ctx,point.x,point.y,radius,start,end,bearing,arcColor,visualArcWidth,0.94);
if(sectorRadius>0){
drawCaLeg(ctx,point.x,point.y,sectorRadius,start,bearing);
drawCaLeg(ctx,point.x,point.y,sectorRadius,end,bearing);