dkforest

commit 2862a68801fdd48b162f3d57a3038f0562f442b8
parent ecb0159a7bef6e9bf8bab0ecca8fdfe59199b42e
Author: n0tr1v <n0tr1v@protonmail.com>
Date:   Thu, 15 Jun 2023 06:18:30 -0700

cleanup arrow code

Diffstat:
M
pkg/web/handlers/chess.go
 | 
46
++++++++++++++++++++++++++--------------------

1 file changed, 26 insertions(+), 20 deletions(-)
diff --git a/pkg/web/handlers/chess.go b/pkg/web/handlers/chess.go
@@ -811,30 +811,36 @@ func calcDisc(x1, y1, x2, y2 int) (d int, isDiag, isLine bool) {
 	return
 }
 
+func arrow(s1, s2 chess.Square) (out string) {
+	cx1, cy1 := squareCoord(s1, false)
+	cx2, cy2 := squareCoord(s2, false)
+	dist, isDiag, isLine := calcDisc(cx1, cy1, cx2, cy2)
+	a := math.Atan2(float64(cy1-cy2), float64(cx1-cx2)) + math.Pi/2 + math.Pi
+	out += "#arrow { display: block !important; } "
+	out += fmt.Sprintf("#arrow { "+
+		"transform: rotate(%.9frad) !important; "+
+		"top: calc(%d*12.5%% + (12.5%%/2)) !important; "+
+		"left: calc(%d*12.5%% + (12.5%%/2) - 6.25%%) !important; "+
+		"} ", a, cy2, cx2)
+	var h string
+	if isDiag {
+		dist /= 2
+		h = fmt.Sprintf("calc(%d*17.67%% + 10.67%%)", dist-1)
+	} else if isLine {
+		h = fmt.Sprintf("calc(%d*12.5%% + 5.5%%)", dist-1)
+	} else {
+		h = fmt.Sprintf("calc(20.95%%)")
+	}
+	out += fmt.Sprintf("#arrow .rectangle { height: %s !important; }", h)
+	return
+}
+
 func renderBestMove(styles *StylesBuilder, bestMove *chess.Move) {
 	if bestMove != nil {
-		styles.Append("#arrow { display: block !important; }")
 		s1 := bestMove.S1()
 		s2 := bestMove.S2()
-		cx1, cy1 := squareCoord(s1, false)
-		cx2, cy2 := squareCoord(s2, false)
-		a := math.Atan2(float64(cy1-cy2), float64(cx1-cx2)) + math.Pi/2 + math.Pi
-		styles.Appendf("#arrow { "+
-			"transform: rotate(%.9frad) !important; "+
-			"top: calc(%d*12.5%% + (12.5%%/2)) !important; "+
-			"left: calc(%d*12.5%% + (12.5%%/2) - 6.25%%) !important; "+
-			"}", a, cy2, cx2)
-		dist, isDiag, isLine := calcDisc(cx1, cy1, cx2, cy2)
-		var h string
-		if isDiag {
-			dist /= 2
-			h = fmt.Sprintf("calc(%d*17.67%% + 10.67%%)", dist-1)
-		} else if isLine {
-			h = fmt.Sprintf("calc(%d*12.5%% + 5.5%%)", dist-1)
-		} else {
-			h = fmt.Sprintf("calc(20.95%%)")
-		}
-		styles.Appendf("#arrow .rectangle { height: %s !important; }", h)
+		arrowStyle := arrow(s1, s2)
+		styles.Append(arrowStyle)
 	}
 }