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snap to cursor on click

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This commit is contained in:
Adam Jeniski 2026-01-02 14:32:09 -05:00
parent ac81079c5a
commit a546fe38b7
1 changed files with 9 additions and 11 deletions
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20
line-segment-intersection/src/App.svelte
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@ -77,18 +77,16 @@
}
function handleCanvasClick(event) {
// If we're about to turn off tracking, update position one last time
if (trackHover) {
const rect = canvas.getBoundingClientRect();
const mouseX = event.clientX - rect.left;
const mouseY = event.clientY - rect.top;
// Update position at click location before toggling tracking
const rect = canvas.getBoundingClientRect();
const mouseX = event.clientX - rect.left;
const mouseY = event.clientY - rect.top;
// Add half grid unit offset for snapping to closest grid intersection
userPoint = {
x: Math.floor((mouseX + GRID_SIZE / 2) / GRID_SIZE),
y: Math.floor((HEIGHT - mouseY + GRID_SIZE / 2) / GRID_SIZE)
};
}
// Add half grid unit offset for snapping to closest grid intersection
userPoint = {
x: Math.floor((mouseX + GRID_SIZE / 2) / GRID_SIZE),
y: Math.floor((HEIGHT - mouseY + GRID_SIZE / 2) / GRID_SIZE)
};
trackHover = !trackHover;
}