draw cube util

Author: BuckarooBanzay

iso_utils.go

@@ -1,6 +1,11 @@
 package maprenderer
 
-import "math"
+import (
+	"image/color"
+	"math"
+
+	"github.com/fogleman/gg"
+)
 
 var sqrt3 = math.Sqrt(3)
 var sin30 = math.Sin(30 * math.Pi / 180)
@@ -41,3 +46,55 @@ func GetImagePos(rel_pos, size *Pos, size_x, size_y int, cubesize float64) (floa
 
 	return x_pos, y_pos
 }
+
+func DrawCube(dc *gg.Context, c *color.RGBA, size float64, offset_x, offset_y float64) {
+	size_x, size_y := GetIsoCubeSize(size)
+
+	// center position
+	center_x := (size_x / 2) + offset_x
+	center_y := (size_y / 2) + offset_y
+
+	// calculate ends
+	end_x := offset_x + size_x
+	end_y := offset_y + size_y
+
+	// proportional size
+	sin30_proportional := sin30 * size
+
+	// right side
+	dc.SetRGBA255(int(c.R), int(c.G), int(c.B), int(c.A))
+	dc.MoveTo(center_x, center_y)
+	dc.LineTo(end_x, center_y-sin30_proportional)
+	dc.LineTo(end_x, end_y-sin30_proportional)
+	dc.LineTo(center_x, end_y)
+	dc.ClosePath()
+	dc.Fill()
+
+	// left side
+	dc.SetRGBA255(
+		AdjustColorComponent(c.R, -20),
+		AdjustColorComponent(c.G, -20),
+		AdjustColorComponent(c.B, -20),
+		int(c.A),
+	)
+	dc.MoveTo(center_x, center_y)
+	dc.LineTo(center_x, end_y)
+	dc.LineTo(offset_x, end_y-sin30_proportional)
+	dc.LineTo(offset_x, center_y-sin30_proportional)
+	dc.ClosePath()
+	dc.Fill()
+
+	// top side
+	dc.SetRGBA255(
+		AdjustColorComponent(c.R, 20),
+		AdjustColorComponent(c.G, 20),
+		AdjustColorComponent(c.B, 20),
+		int(c.A),
+	)
+	dc.MoveTo(center_x, center_y)
+	dc.LineTo(offset_x, center_y-sin30_proportional)
+	dc.LineTo(center_x, offset_y)
+	dc.LineTo(end_x, center_y-sin30_proportional)
+	dc.ClosePath()
+	dc.Fill()
+}

isocache.go

@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"image"
 	"image/color"
-	"math"
 	"sync"
 
 	"github.com/fogleman/gg"
@@ -34,58 +33,9 @@ func (rc *IsoRenderCache) GetCachedIsoCubeImage(c *color.RGBA, size float64) ima
 	rc.lock.RUnlock()
 
 	if img == nil {
-		// create image
 		size_x, size_y := GetIsoCubeSize(size)
-		// round up
-		size_x = math.Ceil(size_x)
-		size_y = math.Ceil(size_y)
-
-		// center position
-		center_x := size_x / 2
-		center_y := size_y / 2
-
-		// proportional size
-		sin30_proportional := sin30 * size
-
-		dc := gg.NewContext(int(math.Ceil(size_x)), int(math.Ceil(size_y)))
-
-		// right side
-		dc.SetRGBA255(int(c.R), int(c.G), int(c.B), int(c.A))
-		dc.MoveTo(center_x, center_y)
-		dc.LineTo(size_x, center_y-sin30_proportional)
-		dc.LineTo(size_x, size_y-sin30_proportional)
-		dc.LineTo(center_x, size_y)
-		dc.ClosePath()
-		dc.Fill()
-
-		// left side
-		dc.SetRGBA255(
-			AdjustColorComponent(c.R, -20),
-			AdjustColorComponent(c.G, -20),
-			AdjustColorComponent(c.B, -20),
-			int(c.A),
-		)
-		dc.MoveTo(center_x, center_y)
-		dc.LineTo(center_x, size_y)
-		dc.LineTo(0, size_y-sin30_proportional)
-		dc.LineTo(0, center_y-sin30_proportional)
-		dc.ClosePath()
-		dc.Fill()
-
-		// top side
-		dc.SetRGBA255(
-			AdjustColorComponent(c.R, 20),
-			AdjustColorComponent(c.G, 20),
-			AdjustColorComponent(c.B, 20),
-			int(c.A),
-		)
-		dc.MoveTo(center_x, center_y)
-		dc.LineTo(0, center_y-sin30_proportional)
-		dc.LineTo(center_x, 0)
-		dc.LineTo(size_x, center_y-sin30_proportional)
-		dc.ClosePath()
-		dc.Fill()
-
+		dc := gg.NewContext(int(size_x), int(size_y))
+		DrawCube(dc, c, size, 0, 0)
 		img = dc.Image()
 
 		// cache for future use

isorenderer.go

@@ -3,8 +3,9 @@ package maprenderer
 import (
 	"image"
 	"image/color"
-	"image/draw"
 	"sort"
+
+	"github.com/fogleman/gg"
 )
 
 func NewIsoRenderer(cr ColorResolver, na NodeAccessor, cubesize int) (*IsoRenderer, error) {
@@ -78,29 +79,34 @@ func (r *IsoRenderer) Render(from, to *Pos) (image.Image, error) {
 		return nodes[i].Order < nodes[j].Order
 	})
 
-	// prepare image
-	//dc := gg.NewContext(600, 600) //TODO
-
 	size := to.Subtract(from).Add(NewPos(1, 1, 1))
 	size_x, size_y := GetIsometricImageSize(size, r.cubesize)
-	img := image.NewRGBA(image.Rect(0, 0, size_x, size_y))
+
+	// prepare image
+	dc := gg.NewContext(size_x, size_y)
 
 	for _, node := range nodes {
 		rel_pos := node.Pos.Subtract(from)
 		x, y := GetImagePos(rel_pos, size, size_x, size_y, r.cubesize)
 
-		cube_img := r.rc.GetCachedIsoCubeImage(node.RGBA, r.cubesize)
-		p1 := image.Point{X: int(x), Y: int(y)}
-		r := image.Rectangle{
-			p1, p1.Add(cube_img.Bounds().Size()),
-		}
+		// uncached draw
+		DrawCube(dc, node.RGBA, r.cubesize, x, y)
+
+		// cached draw
+		/*
+			cube_img := r.rc.GetCachedIsoCubeImage(node.RGBA, r.cubesize)
+			p1 := image.Point{X: int(x), Y: int(y)}
+			r := image.Rectangle{
+				p1, p1.Add(cube_img.Bounds().Size()),
+			}
 
-		// NOTE: the native "draw.Draw" function doesn't work with transparency
-		draw.Draw(img, r, cube_img, image.Point{0, 0}, draw.Over)
-		//dc.DrawImage(cube_img, int(math.Floor(x)), int(math.Floor(y)))
+			// NOTE: the native "draw.Draw" function doesn't work with transparency
+			draw.Draw(img, r, cube_img, image.Point{0, 0}, draw.Over)
+			//dc.DrawImage(cube_img, int(math.Floor(x)), int(math.Floor(y)))
+		*/
 	}
 
-	return img, nil
+	return dc.Image(), nil
 }
 
 func (r *IsoRenderer) searchNode(pos, direction, base_pos *Pos, bounds [2]*Pos) (*IsometricNode, error) {