✨ (sudoku): add click with highlight

Author: yuanyu90221

internal/layout/click-handler.go

@@ -0,0 +1,30 @@
+package layout
+
+import (
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
+	"github.com/leetcode-golang-classroom/sudoku-game/internal/game"
+)
+
+func (gameLayout *GameLayout) detectClickCell() {
+	if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) {
+		xPos, yPos := ebiten.CursorPosition()
+		yPos -= PanelHeight
+		// range check
+		if (xPos >= 0 && xPos <= ScreenWidth) &&
+			(yPos >= 0 && yPos <= ScreenHeight) {
+			row := yPos / cellSize
+			col := xPos / cellSize
+			gameLayout.updateCursor(row, col)
+		}
+	}
+}
+
+func (gameLayout *GameLayout) updateCursor(row, col int) {
+	if row >= 0 && row < game.BoardSize {
+		gameLayout.gameInstance.Board.CursorRow = row
+	}
+	if col >= 0 && col < game.BoardSize {
+		gameLayout.gameInstance.Board.CursorCol = col
+	}
+}

internal/layout/high-light.go

@@ -0,0 +1,65 @@
+package layout
+
+import (
+	"image/color"
+
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/vector"
+	"github.com/leetcode-golang-classroom/sudoku-game/internal/game"
+)
+
+func (gameLayout *GameLayout) drawHighLightCell(screen *ebiten.Image, row, col int) {
+	board := gameLayout.gameInstance.Board
+	cursorRow := board.CursorRow
+	cursorCol := board.CursorCol
+
+	// 跳過自己
+	if row == cursorRow && col == cursorCol {
+		return
+	}
+	// highLight relative row, col
+	if row == cursorRow || col == cursorCol {
+		gameLayout.drawHighLightCover(screen, row, col)
+		return
+	}
+	boxSize := game.BoxSize
+	boxRow := (cursorRow / boxSize) * boxSize
+	boxCol := (cursorCol / boxSize) * boxSize
+	// highLight Box value check
+	for r := 0; r < boxSize; r++ {
+		for c := 0; c < boxSize; c++ {
+			br := boxRow + r
+			bc := boxCol + c
+			if br == row && bc == col {
+				gameLayout.drawHighLightCover(screen, row, col)
+				break
+			}
+		}
+	}
+}
+
+func (gameLayout *GameLayout) drawHighLightCover(screen *ebiten.Image, row, col int) {
+	xPos := col * cellSize
+	yPos := PanelHeight + row*cellSize
+	// stable blue
+	bgColor := color.RGBA{0x6a, 0x5a, 0xcd, 128}
+	if col%3 == 0 {
+		xPos += thinkLineWidth
+	} else {
+		xPos += leanLineWidth
+	}
+	if row%3 == 0 {
+		yPos += thinkLineWidth
+	} else {
+		yPos += leanLineWidth
+	}
+	vector.DrawFilledRect(
+		screen,
+		float32(xPos),
+		float32(yPos),
+		cellSize-1,
+		cellSize-1,
+		bgColor,
+		false,
+	)
+}

internal/layout/layout.go

@@ -33,6 +33,7 @@ func (gameLayout *GameLayout) Update() error {
 	if gameLayout.isPlayerWin {
 		return nil
 	}
+	gameLayout.detectClickCell()
 	gameLayout.elapsedSeconds = gameLayout.gameInstance.GetElaspedTime()
 	gameLayout.DetectCursor()
 	gameLayout.DetectInput()
@@ -105,6 +106,8 @@ func (gameLayout *GameLayout) drawCellValuesOnBoard(screen *ebiten.Image) {
 					getTileColor(board.Cells[row][col].Type),
 				)
 			}
+			// highlight background
+			gameLayout.drawHighLightCell(screen, row, col)
 		}
 	}
 }