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author=Corey Hulen <corey@hulen.com>2015-11-23 15:53:48 -0800
committer=Corey Hulen <corey@hulen.com>2015-11-23 15:53:48 -0800
commit4f4cd5e63573da4d6edcc7d4213afaca67c19f88 (patch)
treecefbc7af53629d97644ca2f6b2369e9d879f0101 /Godeps/_workspace/src/code.google.com/p/freetype-go/example/round
parentf8a3c9a14edca6df0647d89cf225f2470cbe025c (diff)
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upgrading libs
Diffstat (limited to 'Godeps/_workspace/src/code.google.com/p/freetype-go/example/round')
-rw-r--r--Godeps/_workspace/src/code.google.com/p/freetype-go/example/round/main.go96
1 files changed, 0 insertions, 96 deletions
diff --git a/Godeps/_workspace/src/code.google.com/p/freetype-go/example/round/main.go b/Godeps/_workspace/src/code.google.com/p/freetype-go/example/round/main.go
deleted file mode 100644
index e2435f9a2..000000000
--- a/Godeps/_workspace/src/code.google.com/p/freetype-go/example/round/main.go
+++ /dev/null
@@ -1,96 +0,0 @@
-// Copyright 2010 The Freetype-Go Authors. All rights reserved.
-// Use of this source code is governed by your choice of either the
-// FreeType License or the GNU General Public License version 2 (or
-// any later version), both of which can be found in the LICENSE file.
-
-// This program visualizes the quadratic approximation to the circle, used to
-// implement round joins when stroking paths. The approximation is used in the
-// stroking code for arcs between 0 and 45 degrees, but is visualized here
-// between 0 and 90 degrees. The discrepancy between the approximation and the
-// true circle is clearly visible at angles above 65 degrees.
-package main
-
-import (
- "bufio"
- "fmt"
- "image"
- "image/color"
- "image/draw"
- "image/png"
- "log"
- "math"
- "os"
-
- "code.google.com/p/freetype-go/freetype/raster"
-)
-
-func main() {
- const (
- n = 17
- r = 256 * 80
- )
- s := raster.Fix32(r * math.Sqrt(2) / 2)
- t := raster.Fix32(r * math.Tan(math.Pi/8))
-
- m := image.NewRGBA(image.Rect(0, 0, 800, 600))
- draw.Draw(m, m.Bounds(), image.NewUniform(color.RGBA{63, 63, 63, 255}), image.ZP, draw.Src)
- mp := raster.NewRGBAPainter(m)
- mp.SetColor(image.Black)
- z := raster.NewRasterizer(800, 600)
-
- for i := 0; i < n; i++ {
- cx := raster.Fix32(25600 + 51200*(i%4))
- cy := raster.Fix32(2560 + 32000*(i/4))
- c := raster.Point{X: cx, Y: cy}
- theta := math.Pi * (0.5 + 0.5*float64(i)/(n-1))
- dx := raster.Fix32(r * math.Cos(theta))
- dy := raster.Fix32(r * math.Sin(theta))
- d := raster.Point{X: dx, Y: dy}
- // Draw a quarter-circle approximated by two quadratic segments,
- // with each segment spanning 45 degrees.
- z.Start(c)
- z.Add1(c.Add(raster.Point{X: r, Y: 0}))
- z.Add2(c.Add(raster.Point{X: r, Y: t}), c.Add(raster.Point{X: s, Y: s}))
- z.Add2(c.Add(raster.Point{X: t, Y: r}), c.Add(raster.Point{X: 0, Y: r}))
- // Add another quadratic segment whose angle ranges between 0 and 90 degrees.
- // For an explanation of the magic constants 22, 150, 181 and 256, read the
- // comments in the freetype/raster package.
- dot := 256 * d.Dot(raster.Point{X: 0, Y: r}) / (r * r)
- multiple := raster.Fix32(150 - 22*(dot-181)/(256-181))
- z.Add2(c.Add(raster.Point{X: dx, Y: r + dy}.Mul(multiple)), c.Add(d))
- // Close the curve.
- z.Add1(c)
- }
- z.Rasterize(mp)
-
- for i := 0; i < n; i++ {
- cx := raster.Fix32(25600 + 51200*(i%4))
- cy := raster.Fix32(2560 + 32000*(i/4))
- for j := 0; j < n; j++ {
- theta := math.Pi * float64(j) / (n - 1)
- dx := raster.Fix32(r * math.Cos(theta))
- dy := raster.Fix32(r * math.Sin(theta))
- m.Set(int((cx+dx)/256), int((cy+dy)/256), color.RGBA{255, 255, 0, 255})
- }
- }
-
- // Save that RGBA image to disk.
- f, err := os.Create("out.png")
- if err != nil {
- log.Println(err)
- os.Exit(1)
- }
- defer f.Close()
- b := bufio.NewWriter(f)
- err = png.Encode(b, m)
- if err != nil {
- log.Println(err)
- os.Exit(1)
- }
- err = b.Flush()
- if err != nil {
- log.Println(err)
- os.Exit(1)
- }
- fmt.Println("Wrote out.png OK.")
-}