intermediate commit

1 files changed, 109 insertions, 0 deletions

diff --git a/go/ui/map.go b/go/ui/map.go
new file mode 100644
index 00000000..2e83ad2d
--- /dev/null
+++ b/go/ui/map.go
@@ -0,0 +1,109 @@
+package ui
+
+import (
+	"log"
+	"math"
+
+	"github.com/hajimehoshi/ebiten/v2"
+	"muhq.space/muhqs-game/go/assets"
+	"muhq.space/muhqs-game/go/game"
+)
+
+const (
+	TILE_WIDTH  int = 50
+	TILE_HEIGHT int = 50
+)
+
+type MapLayer struct {
+	m   *game.Map
+	img *ebiten.Image
+}
+
+func NewMapLayerFromMap(m *game.Map) *MapLayer {
+	mv := MapLayer{m, nil}
+	return &mv
+}
+
+func rotateStreetImg(x, y int, radian float64, op *ebiten.DrawImageOptions) {
+	// Move the image's center to the screen's upper-left corner.
+	// This is a preparation for rotating. When geometry matrices are applied,
+	// the origin point is the upper-left corner.
+	op.GeoM.Translate(-float64(TILE_WIDTH)/2, -float64(TILE_HEIGHT)/2)
+
+	// Rotate the image. As a result, the anchor point of this rotate is
+	// the center of the image.
+	op.GeoM.Rotate(radian)
+
+	// Reset translation
+	op.GeoM.Translate(float64(TILE_WIDTH)/2, float64(TILE_HEIGHT)/2)
+}
+
+func (m *MapLayer) rotateStreet(x, y int, op *ebiten.DrawImageOptions) {
+	connections, left, right, above, below := m.m.FindStreetConnections(x, y)
+
+	if connections == 0 {
+		// This street is not connected to another street ->
+		// check any other non neutral tiles
+		connections, left, right, above, below = m.m.FindAnyConnections(x, y)
+	}
+
+	// This street is not connected to anything. Seams odd!
+	if connections == 0 {
+		log.Printf("Street  at (%d, %d) is not connected", x, y)
+	} else if (connections == 1 ||
+		(connections == 2 && ((left && right) || (above && below)))) &&
+		(above || below) {
+		rotateStreetImg(x, y, math.Pi/2, op)
+	} else if connections == 2 {
+		// normal orientation above and right
+		if right && below {
+			rotateStreetImg(x, y, 3*math.Pi/2, op)
+		} else if left && below {
+			rotateStreetImg(x, y, math.Pi, op)
+		} else if above && left {
+			rotateStreetImg(x, y, math.Pi/2, op)
+		}
+	} else if connections == 3 {
+		// normal orientation left above right
+		if above && right && below {
+			rotateStreetImg(x, y, 3*math.Pi/2, op)
+		} else if left && below && right {
+			rotateStreetImg(x, y, math.Pi, op)
+		} else if below && left && above {
+			rotateStreetImg(x, y, math.Pi/2, op)
+		}
+	}
+}
+
+func (m *MapLayer) Draw(screen *ebiten.Image) {
+	if m.img == nil {
+		// TODO: support non symetric maps
+		maxWidth := len(m.m.Tiles[0]) * TILE_WIDTH
+		maxHeight := len(m.m.Tiles) * TILE_HEIGHT
+		m.img = ebiten.NewImage(maxWidth, maxHeight)
+
+		x_px, y_px := 0.0, 0.0
+		for y := 0; y < len(m.m.Tiles); y++ {
+			for x := 0; x < len(m.m.Tiles[y]); x++ {
+				tile := &m.m.Tiles[y][x]
+				tileImg := assets.GetTile(tile.Raw)
+
+				op := &ebiten.DrawImageOptions{}
+				// Rotate Street
+				if tile.Type == game.TileTypes.Street {
+					m.rotateStreet(x, y, op)
+				}
+
+				op.GeoM.Translate(x_px, y_px)
+
+				m.img.DrawImage(tileImg, op)
+
+				x_px += float64(TILE_WIDTH)
+			}
+			x_px = 0
+			y_px += float64(TILE_HEIGHT)
+		}
+	}
+
+	screen.DrawImage(m.img, &ebiten.DrawImageOptions{})
+}