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Add pixel centering(half pixel offset) for trails

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This commit is contained in:
scamiv
2026-03-03 00:31:37 +01:00
parent feae565409
commit 93c2906f03
1 changed files with 24 additions and 17 deletions
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src/client/graphics/layers/SegmentTrailRaster.ts
+24 -17
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@@ -13,18 +13,17 @@ export type SegmentTrailPlanView = {
segCumSteps: Uint32Array;
};
export function totalTrailSteps(plan: {
segCumSteps: Uint32Array;
}): number {
function pixelCenter(value: number): number {
return value + 0.5;
}
export function totalTrailSteps(plan: { segCumSteps: Uint32Array }): number {
return plan.segCumSteps.length === 0
? 0
: plan.segCumSteps[plan.segCumSteps.length - 1] >>> 0;
}
export function stepAtTick(
plan: SegmentTrailPlanView,
tick: number,
): number {
export function stepAtTick(plan: SegmentTrailPlanView, tick: number): number {
const total = totalTrailSteps(plan);
if (total <= 0) {
return 0;
@@ -47,9 +46,7 @@ export function locateSegment(
return 0;
}
const total =
segCumSteps.length === 0
? 0
: segCumSteps[segCumSteps.length - 1] >>> 0;
segCumSteps.length === 0 ? 0 : segCumSteps[segCumSteps.length - 1] >>> 0;
if (total <= 0) {
return 0;
}
@@ -147,23 +144,33 @@ export function strokeStepInterval(
const toSeg = locateSegment(plan.segCumSteps, segmentCount, to);
ctx.beginPath();
ctx.moveTo(start.x, start.y);
ctx.moveTo(pixelCenter(start.x), pixelCenter(start.y));
if (fromSeg === toSeg) {
ctx.lineTo(end.x, end.y);
ctx.lineTo(pixelCenter(end.x), pixelCenter(end.y));
ctx.stroke();
return true;
}
const fromBoundaryRef = plan.points[Math.min(plan.points.length - 1, fromSeg + 1)] as TileRef;
ctx.lineTo(game.x(fromBoundaryRef), game.y(fromBoundaryRef));
const fromBoundaryRef = plan.points[
Math.min(plan.points.length - 1, fromSeg + 1)
] as TileRef;
ctx.lineTo(
pixelCenter(game.x(fromBoundaryRef)),
pixelCenter(game.y(fromBoundaryRef)),
);
for (let seg = fromSeg + 1; seg < toSeg; seg++) {
const boundaryRef = plan.points[Math.min(plan.points.length - 1, seg + 1)] as TileRef;
ctx.lineTo(game.x(boundaryRef), game.y(boundaryRef));
const boundaryRef = plan.points[
Math.min(plan.points.length - 1, seg + 1)
] as TileRef;
ctx.lineTo(
pixelCenter(game.x(boundaryRef)),
pixelCenter(game.y(boundaryRef)),
);
}
ctx.lineTo(end.x, end.y);
ctx.lineTo(pixelCenter(end.x), pixelCenter(end.y));
ctx.stroke();
return true;
}