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feat(ui/compass): draw the ring as a circle, not a square

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Replace the bounding-box stand-in with a midpoint-circle ring.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Jakub
2026-06-03 16:54:30 +02:00
parent 98ccf13336
commit 288a6195da
1 changed files with 15 additions and 1 deletions
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16
examples/companion_radio/ui-new/CompassScreen.h
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@@ -22,6 +22,20 @@ class CompassScreen : public UIScreen {
#endif
}
// Midpoint circle (DisplayDriver has no circle primitive).
static void drawCircle(DisplayDriver& d, int cx, int cy, int r) {
int x = r, y = 0, err = 1 - r;
while (x >= y) {
d.fillRect(cx + x, cy + y, 1, 1); d.fillRect(cx + y, cy + x, 1, 1);
d.fillRect(cx - y, cy + x, 1, 1); d.fillRect(cx - x, cy + y, 1, 1);
d.fillRect(cx - x, cy - y, 1, 1); d.fillRect(cx - y, cy - x, 1, 1);
d.fillRect(cx + y, cy - x, 1, 1); d.fillRect(cx + x, cy - y, 1, 1);
y++;
if (err < 0) err += 2 * y + 1;
else { x--; err += 2 * (y - x) + 1; }
}
}
static void drawLine(DisplayDriver& d, int x0, int y0, int x1, int y1) {
int dx = abs(x1 - x0), sx = x0 < x1 ? 1 : -1;
int dy = -abs(y1 - y0), sy = y0 < y1 ? 1 : -1;
@@ -67,7 +81,7 @@ public:
int cog;
bool have = _task->currentCourse(cog);
display.drawRect(cx - r, cy - r, 2 * r + 1, 2 * r + 1); // ring stand-in
drawCircle(display, cx, cy, r); // compass ring
// Fixed forward index at the top: the direction you are travelling is
// always "up". The compass card (North) rotates underneath it.