test for concurrent text drawing

sync_test.go

@@ -0,0 +1,45 @@
+// go test -race -test.v sync_test.go 
+
+package draw2d_test
+
+import (
+	"fmt"
+	"github.com/llgcode/draw2d"
+	"github.com/llgcode/draw2d/draw2dimg"
+	"github.com/llgcode/draw2d/draw2dkit"
+	"image"
+	"testing"
+)
+
+func TestSync(t *testing.T) {
+	ch := make(chan int)
+	limit := 2000
+	for i := 0; i < limit; i++ {
+		go Draw(i, ch)
+	}
+
+	for i := 0; i < limit; i++ {
+		counter := <-ch
+		t.Logf("Goroutine %d returned\n", counter)
+	}
+}
+
+func Draw(i int, ch chan<- int) {
+  draw2d.SetFontFolder("./resource/font")
+	// Draw a rounded rectangle using default colors
+	dest := image.NewRGBA(image.Rect(0, 0, 297, 210.0))
+	gc := draw2dimg.NewGraphicContext(dest)
+
+	draw2dkit.RoundedRectangle(gc, 5, 5, 135, 95, 10, 10)
+	gc.FillStroke()
+
+	// Set the fill text color to black
+	gc.SetFillColor(image.Black)
+	gc.SetFontSize(14)
+
+	// Display Hello World dimensions
+	x1, y1, x2, y2 := gc.GetStringBounds("Hello world")
+	gc.FillStringAt(fmt.Sprintf("%.2f %.2f %.2f %.2f", x1, y1, x2, y2), 0, 0)
+
+	ch <- i
+}