images and fonts can now be optionally named for later access; DrawImage and SetFont can now accept file names directly and will cache using the path

canvas.go

@@ -5,6 +5,7 @@ import (
 	"image"
 	"unsafe"
 
+	"github.com/golang/freetype/truetype"
 	"github.com/tfriedel6/lm"
 )
 
@@ -358,6 +359,10 @@ func parseStyle(value ...interface{}) drawStyle {
 		case *Image:
 			style.image = v
 			return style
+		case string:
+			if img, ok := images[v]; ok {
+				style.image = img
+			}
 		}
 	}
 	c, ok := parseColor(value...)
@@ -428,8 +433,22 @@ func (cv *Canvas) SetLineWidth(width float32) {
 }
 
 // SetFont sets the font and font size
-func (cv *Canvas) SetFont(font *Font, size float32) {
-	cv.state.font = font
+func (cv *Canvas) SetFont(font interface{}, size float32) {
+	switch v := font.(type) {
+	case *Font:
+		cv.state.font = v
+	case *truetype.Font:
+		cv.state.font = &Font{font: v}
+	case string:
+		if f, ok := fonts[v]; ok {
+			cv.state.font = f
+		} else {
+			f, err := LoadFont(v, v)
+			if err == nil {
+				cv.state.font = f
+			}
+		}
+	}
 	cv.state.fontSize = size
 }
 

images.go

@@ -17,7 +17,9 @@ type Image struct {
 	deleted bool
 }
 
-func LoadImage(src interface{}) (*Image, error) {
+var images = make(map[string]*Image)
+
+func LoadImage(src interface{}, name string) (*Image, error) {
 	var img *Image
 	var err error
 	switch v := src.(type) {
@@ -45,16 +47,19 @@ func LoadImage(src interface{}) (*Image, error) {
 		if err != nil {
 			return nil, err
 		}
-		return LoadImage(srcImg)
+		return LoadImage(srcImg, name)
 	case []byte:
 		srcImg, _, err := image.Decode(bytes.NewReader(v))
 		if err != nil {
 			return nil, err
 		}
-		return LoadImage(srcImg)
+		return LoadImage(srcImg, name)
 	default:
 		return nil, errors.New("Unsupported source type")
 	}
+	if name != "" {
+		images[name] = img
+	}
 	runtime.SetFinalizer(img, func(img *Image) {
 		glChan <- func() {
 			gli.DeleteTextures(1, &img.tex)
@@ -169,7 +174,26 @@ func (img *Image) Delete() {
 	img.deleted = true
 }
 
-func (cv *Canvas) DrawImage(img *Image, coords ...float32) {
+func (cv *Canvas) DrawImage(image interface{}, coords ...float32) {
+	var img *Image
+	switch v := image.(type) {
+	case *Image:
+		img = v
+	case string:
+		if i, ok := images[v]; ok {
+			img = i
+		} else {
+			i, err := LoadImage(v, v)
+			if err == nil {
+				img = i
+			}
+		}
+	}
+
+	if img == nil {
+		return
+	}
+
 	if img.deleted {
 		return
 	}

paths.go

@@ -118,8 +118,8 @@ func (cv *Canvas) Arc(x, y, radius, startAngle, endAngle float32, anticlockwise
 	step := 6 / fmath.Max(tr[0], tr[1])
 	if step > 0.8 {
 		step = 0.8
-	} else if step < 0.01 {
-		step = 0.01
+	} else if step < 0.05 {
+		step = 0.05
 	}
 	if anticlockwise {
 		for a := startAngle; a > endAngle; a -= step {
@@ -316,8 +316,8 @@ func (cv *Canvas) addCircleTris(center lm.Vec2, radius float32, tris []float32)
 	step := 6 / radius
 	if step > 0.8 {
 		step = 0.8
-	} else if step < 0.01 {
-		step = 0.01
+	} else if step < 0.05 {
+		step = 0.05
 	}
 	for angle := step; angle <= math.Pi*2+step; angle += step {
 		s, c := fmath.Sincos(angle)

text.go

@@ -18,10 +18,13 @@ type Font struct {
 	font *truetype.Font
 }
 
-func LoadFont(src interface{}) (*Font, error) {
+var fonts = make(map[string]*Font)
+
+func LoadFont(src interface{}, name string) (*Font, error) {
+	var f *Font
 	switch v := src.(type) {
 	case *truetype.Font:
-		return &Font{font: v}, nil
+		f = &Font{font: v}
 	case string:
 		data, err := ioutil.ReadFile(v)
 		if err != nil {
@@ -31,15 +34,20 @@ func LoadFont(src interface{}) (*Font, error) {
 		if err != nil {
 			return nil, err
 		}
-		return &Font{font: font}, nil
+		f = &Font{font: font}
 	case []byte:
 		font, err := freetype.ParseFont(v)
 		if err != nil {
 			return nil, err
 		}
-		return &Font{font: font}, nil
-	}
+		f = &Font{font: font}
+	default:
 		return nil, errors.New("Unsupported source type")
+	}
+	if name != "" {
+		fonts[name] = f
+	}
+	return f, nil
 }
 
 func (cv *Canvas) FillText(str string, x, y float32) {