diff --git a/draw2dbase/stack_gc.go b/draw2dbase/stack_gc.go index a5b01d8..77622bb 100644 --- a/draw2dbase/stack_gc.go +++ b/draw2dbase/stack_gc.go @@ -4,6 +4,7 @@ package draw2dbase import ( + "fmt" "image" "image/color" @@ -195,3 +196,8 @@ func (gc *StackGraphicContext) Restore() { oldContext.Previous = nil } } + +func (gc *StackGraphicContext) GetFontName() string { + fontData := gc.Current.FontData + return fmt.Sprintf("%s:%d:%d:%d", fontData.Name, fontData.Family, fontData.Style, gc.Current.FontSize) +} diff --git a/draw2dbase/text.go b/draw2dbase/text.go new file mode 100644 index 0000000..4283bad --- /dev/null +++ b/draw2dbase/text.go @@ -0,0 +1,68 @@ +package draw2dbase + +import "github.com/llgcode/draw2d" + +var glyphCache map[string]map[rune]*Glyph + +func init() { + glyphCache = make(map[string]map[rune]*Glyph) +} + +// FetchGlyph fetches a glyph from the cache, calling renderGlyph first if it doesn't already exist +func FetchGlyph(gc draw2d.GraphicContext, fontName string, chr rune) *Glyph { + if glyphCache[fontName] == nil { + glyphCache[fontName] = make(map[rune]*Glyph, 60) + } + if glyphCache[fontName][chr] == nil { + glyphCache[fontName][chr] = renderGlyph(gc, fontName, chr) + } + return glyphCache[fontName][chr].Copy() +} + +// renderGlyph renders a glyph then caches and returns it +func renderGlyph(gc draw2d.GraphicContext, fontName string, chr rune) *Glyph { + gc.Save() + defer gc.Restore() + gc.BeginPath() + width := gc.CreateStringPath(string(chr), 0, 0) + path := gc.GetPath() + return &Glyph{ + path: &path, + Width: width, + } +} + +// Glyph represents a rune which has been converted to a Path and width +type Glyph struct { + // path represents a glyph, it is always at (0, 0) + path *draw2d.Path + // Width of the glyph + Width float64 +} + +func (g *Glyph) Copy() *Glyph { + return &Glyph{ + path: g.path.Copy(), + Width: g.Width, + } +} + +// Fill copies a glyph from the cache, and fills it +func (g *Glyph) Fill(gc draw2d.GraphicContext, x, y float64) float64 { + gc.Save() + gc.BeginPath() + gc.Translate(x, y) + gc.Fill(g.path) + gc.Restore() + return g.Width +} + +// Stroke fetches a glyph from the cache, and strokes it +func (g *Glyph) Stroke(gc draw2d.GraphicContext, x, y float64) float64 { + gc.Save() + gc.BeginPath() + gc.Translate(x, y) + gc.Stroke(g.path) + gc.Restore() + return g.Width +} diff --git a/draw2dgl/gc.go b/draw2dgl/gc.go index 582eabf..ec2da25 100644 --- a/draw2dgl/gc.go +++ b/draw2dgl/gc.go @@ -197,10 +197,20 @@ func (gc *GraphicContext) CreateStringPath(s string, x, y float64) float64 { return x - startx } +// FillString draws the text at point (0, 0) +func (gc *GraphicContext) FillString(text string) (width float64) { + return gc.FillStringAt(text, 0, 0) +} + +// FillStringAt draws the text at the specified point (x, y) func (gc *GraphicContext) FillStringAt(text string, x, y float64) (width float64) { - width = gc.CreateStringPath(text, x, y) - gc.Fill() - return width + xorig := x + fontName := gc.GetFontName() + for _, r := range text { + glyph := draw2dbase.FetchGlyph(gc, fontName, r) + x += glyph.Fill(gc, x, y) + } + return x - xorig } // GetStringBounds returns the approximate pixel bounds of the string s at x, y. @@ -242,14 +252,20 @@ func (gc *GraphicContext) GetStringBounds(s string) (left, top, right, bottom fl return left, top, right, bottom } +// StrokeString draws the contour of the text at point (0, 0) func (gc *GraphicContext) StrokeString(text string) (width float64) { return gc.StrokeStringAt(text, 0, 0) } +// StrokeStringAt draws the contour of the text at point (x, y) func (gc *GraphicContext) StrokeStringAt(text string, x, y float64) (width float64) { - width = gc.CreateStringPath(text, x, y) - gc.Stroke() - return width + xorig := x + fontName := gc.GetFontName() + for _, r := range text { + glyph := draw2dbase.FetchGlyph(gc, fontName, r) + x += glyph.Stroke(gc, x, y) + } + return x - xorig } // recalc recalculates scale and bounds values from the font size, screen @@ -293,10 +309,6 @@ func (gc *GraphicContext) DrawImage(img image.Image) { panic("not implemented") } -func (gc *GraphicContext) FillString(text string) (cursor float64) { - return gc.FillStringAt(text, 0, 0) -} - func (gc *GraphicContext) paint(rasterizer *raster.Rasterizer, color color.Color) { gc.painter.SetColor(color) rasterizer.Rasterize(gc.painter) diff --git a/draw2dimg/ftgc.go b/draw2dimg/ftgc.go index 8bedf91..1f0fa4a 100644 --- a/draw2dimg/ftgc.go +++ b/draw2dimg/ftgc.go @@ -117,27 +117,35 @@ func (gc *GraphicContext) DrawImage(img image.Image) { } // FillString draws the text at point (0, 0) -func (gc *GraphicContext) FillString(text string) (cursor float64) { +func (gc *GraphicContext) FillString(text string) (width float64) { return gc.FillStringAt(text, 0, 0) } // FillStringAt draws the text at the specified point (x, y) -func (gc *GraphicContext) FillStringAt(text string, x, y float64) (cursor float64) { - width := gc.CreateStringPath(text, x, y) - gc.Fill() - return width +func (gc *GraphicContext) FillStringAt(text string, x, y float64) (width float64) { + xorig := x + fontName := gc.GetFontName() + for _, r := range text { + glyph := draw2dbase.FetchGlyph(gc, fontName, r) + x += glyph.Fill(gc, x, y) + } + return x - xorig } // StrokeString draws the contour of the text at point (0, 0) -func (gc *GraphicContext) StrokeString(text string) (cursor float64) { +func (gc *GraphicContext) StrokeString(text string) (width float64) { return gc.StrokeStringAt(text, 0, 0) } // StrokeStringAt draws the contour of the text at point (x, y) -func (gc *GraphicContext) StrokeStringAt(text string, x, y float64) (cursor float64) { - width := gc.CreateStringPath(text, x, y) - gc.Stroke() - return width +func (gc *GraphicContext) StrokeStringAt(text string, x, y float64) (width float64) { + xorig := x + fontName := gc.GetFontName() + for _, r := range text { + glyph := draw2dbase.FetchGlyph(gc, fontName, r) + x += glyph.Stroke(gc, x, y) + } + return x - xorig } func (gc *GraphicContext) loadCurrentFont() (*truetype.Font, error) { diff --git a/gc.go b/gc.go index af34060..543359e 100644 --- a/gc.go +++ b/gc.go @@ -50,6 +50,8 @@ type GraphicContext interface { SetFontData(fontData FontData) // GetFontData gets the current FontData GetFontData() FontData + // GetFontName gets the current FontData as a string + GetFontName() string // DrawImage draws the raster image in the current canvas DrawImage(image image.Image) // Save the context and push it to the context stack