dkforest

commit d3374edc3d556b2d4eb8ecd9b146255fa5e5686c
parent 088f583d2b45f329a8d0ee148f0e642f4734c997
Author: n0tr1v <n0tr1v@protonmail.com>
Date:   Thu, 15 Jun 2023 06:00:42 -0700

perfect arrows

Diffstat:
M
pkg/web/handlers/chess.go
 | 
56
++++++++++++++++++++++++++++++++++++++------------------
M
pkg/web/handlers/interceptors/chess.go
 | 
1
+

2 files changed, 39 insertions(+), 18 deletions(-)
diff --git a/pkg/web/handlers/chess.go b/pkg/web/handlers/chess.go
@@ -795,26 +795,46 @@ func renderHideAllPieces(styles *StylesBuilder) {
 //	return math.Sqrt(math.Pow(p2.GetX()-p1.GetX(), 2) + math.Pow(p2.GetY()-p1.GetY(), 2))
 //}
 
+func calcDisc(x1, y1, x2, y2 int) (d int, isDiag, isLine bool) {
+	dx := int(math.Abs(float64(x2 - x1)))
+	dy := int(math.Abs(float64(y2 - y1)))
+	if x1 == x2 {
+		d = dy
+		isLine = true
+	} else if y1 == y2 {
+		d = dx
+		isLine = true
+	} else {
+		d = dx + dy
+	}
+	isDiag = dx == dy
+	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-origin: top center !important; "+
-		//	"transform: rotate(%.9frad) !important; "+
-		//	"top: calc(%d*12.5%% + (12.5%%/2)) !important; "+
-		//	"left: calc(%d*12.5%% + (12.5%%/2) - 25px) !important; "+
-		//	"}", a, cy2, cx2)
-		//// 12.5%
-		////
-		//styles.Append("#arrow .rectangle { height: calc(4*5.5%) !important; }")
-
-		styles.Appendf(`.square_%d, .square_%d { background-color: rgba(0, 0, 255, 0.2) !important; }`,
-			int(bestMove.S1()), int(bestMove.S2()))
+		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)
 	}
 }
 
diff --git a/pkg/web/handlers/interceptors/chess.go b/pkg/web/handlers/interceptors/chess.go
@@ -136,6 +136,7 @@ func GetID(row, col int, isFlipped bool) (id int) {
 var ChessCSS = `
 <style>
 #arrow {
+	transform-origin: top center !important;
 	display: none;
 	position: absolute;
 	top: 0;