From 656487903e282507c0bfabac5657c124a63c4d7f Mon Sep 17 00:00:00 2001
From: Henrik Hautakoski <henrik.hautakoski@gmail.com>
Date: Sun, 14 Sep 2025 21:46:17 +0200
Subject: [PATCH] feat: add shape struct

---
 game/shape.go      | 58 ++++++++++++++++++++++++++++++++++++++++++++++
 game/shape_type.go | 34 +++++++++++++++++++++++++++
 2 files changed, 92 insertions(+)
 create mode 100644 game/shape.go
 create mode 100644 game/shape_type.go

diff --git a/game/shape.go b/game/shape.go
new file mode 100644
index 0000000..cf0df6f
--- /dev/null
+++ b/game/shape.go
@@ -0,0 +1,58 @@
+package game
+
+import (
+	"tetris/engine/core"
+	"tetris/engine/graphics"
+)
+
+type Shape struct {
+	typ         ShapeType
+	coordinates [3]core.Vec2i8
+}
+
+func NewShape(typ ShapeType) Shape {
+	var coordinates [3]core.Vec2i8
+
+	switch typ {
+	case SHAPE_O:
+		coordinates = [3]core.Vec2i8{{X: 0, Y: 1}, {X: 1, Y: 0}, {X: 1, Y: 1}}
+	case SHAPE_L:
+		coordinates = [3]core.Vec2i8{{X: 0, Y: -1}, {X: 0, Y: 1}, {X: 1, Y: 1}}
+	case SHAPE_J:
+		coordinates = [3]core.Vec2i8{{X: 0, Y: -1}, {X: 0, Y: 1}, {X: -1, Y: 1}}
+	case SHAPE_T:
+		coordinates = [3]core.Vec2i8{{X: -1, Y: 0}, {X: 1, Y: 0}, {X: 0, Y: 1}}
+	case SHAPE_Z:
+		coordinates = [3]core.Vec2i8{{X: 1, Y: 0}, {X: 0, Y: -1}, {X: -1, Y: -1}}
+	case SHAPE_S:
+		coordinates = [3]core.Vec2i8{{X: -1, Y: 0}, {X: 0, Y: -1}, {X: 1, Y: -1}}
+	case SHAPE_I:
+		coordinates = [3]core.Vec2i8{{X: 0, Y: 1}, {X: 0, Y: -1}, {X: 0, Y: -2}}
+	}
+
+	return Shape{
+		typ:         typ,
+		coordinates: coordinates,
+	}
+}
+
+func (s Shape) Type() ShapeType {
+	return s.typ
+}
+
+func (s Shape) GetBlock() Block {
+	return s.typ.GetBlock()
+}
+
+func (s Shape) Tile() graphics.Tile {
+	return s.GetBlock().Tile()
+}
+
+func (s Shape) Coordinates() [4]core.Vec2i8 {
+	return [4]core.Vec2i8{
+		{}, // first coordinate is always zero
+		s.coordinates[0],
+		s.coordinates[1],
+		s.coordinates[2],
+	}
+}
diff --git a/game/shape_type.go b/game/shape_type.go
new file mode 100644
index 0000000..e6074fc
--- /dev/null
+++ b/game/shape_type.go
@@ -0,0 +1,34 @@
+package game
+
+type ShapeType byte
+
+const (
+	SHAPE_O ShapeType = iota
+	SHAPE_L
+	SHAPE_J
+	SHAPE_T
+	SHAPE_Z
+	SHAPE_S
+	SHAPE_I
+)
+
+func (s ShapeType) GetBlock() Block {
+	switch s {
+	case SHAPE_O:
+		return BLOCK_GREEN
+	case SHAPE_L:
+		return BLOCK_RED
+	case SHAPE_J:
+		return BLOCK_BLUE
+	case SHAPE_T:
+		return BLOCK_MAGENTA
+	case SHAPE_Z:
+		return BLOCK_YELLOW
+	case SHAPE_S:
+		return BLOCK_ORANGE
+	case SHAPE_I:
+		return BLOCK_TEAL
+	default:
+		return BLOCK_EMPTY
+	}
+}