57 lines
1.2 KiB
Go
57 lines
1.2 KiB
Go
package game
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// LineClearAnimation clears completed lines cell-by-cell to create
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// a visual wipe effect from the center outward.
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//
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// Once the lines are cleared, the remaining lines are moved down.
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type LineClearAnimation struct {
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// lines to clear.
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lines []byte
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// next index to clear to the left
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leftIndex int8
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// next index to clear to the right
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rightIndex int8
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}
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func (lca *LineClearAnimation) Reset() {
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lca.lines = []byte{}
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}
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func (lca LineClearAnimation) NumLines() int {
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return len(lca.lines)
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}
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func (lca *LineClearAnimation) SetLines(rows []byte) {
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lca.lines = rows
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lca.leftIndex = (GRID_WIDTH - 1) / 2
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if (GRID_WIDTH-1)%2 != 0 {
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lca.rightIndex = lca.leftIndex + 1
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} else {
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lca.rightIndex = lca.leftIndex
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}
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}
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func (lca *LineClearAnimation) Update(grid *Grid) {
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if lca.Completed() {
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return
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}
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if lca.leftIndex < 0 || lca.rightIndex > GRID_WIDTH {
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grid.MoveLinesDown(lca.lines...)
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lca.Reset()
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return
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}
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for _, lineIndex := range lca.lines {
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grid.Set(byte(lca.leftIndex), lineIndex, BLOCK_EMPTY)
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grid.Set(byte(lca.rightIndex), lineIndex, BLOCK_EMPTY)
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}
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lca.leftIndex--
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lca.rightIndex++
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}
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func (lca LineClearAnimation) Completed() bool {
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return lca.NumLines() == 0
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}
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