llgcode / draw2d Goto Github PK

How to use on Google App Engine?

I tried, and it won't compile.

Hi,

weekly.2011-10-06 renamed a bunch of exported funcs, types, etc. I patched my 
local sources, but thought it might be useful to everyone.

Yegor

remove Copyright for godoc

What steps will reproduce the problem?
1. Try to build the library
2. Get the error: interpreter.go:62: too many arguments in call to os.Open

What version of the product are you using? On what operating system?

krasin@krasin7:~/go/go$ hg identify
95d2ce135523 (release-branch.r57) release/release.r57.1


Please provide any additional information below.

Running gofix solves the problem:

krasin@krasin7:~/go/go/src/pkg/draw2d.googlecode.com/hg$ gofix *
AUTHORS:1:1: expected 'package', found 'IDENT' Laurent
cmd/gettingStarted.go:19:30: rewrote os.Open with O_CREATE but not O_TRUNC to 
os.Create
cmd/gettingStarted.go:19:12: rewrote os.Open to os.Create with permission not 
0666
cmd/gettingStarted.go: fixed osopen
cmd/testandroid.go:43:30: rewrote os.Open with O_CREATE but not O_TRUNC to 
os.Create
cmd/testandroid.go:43:12: rewrote os.Open to os.Create with permission not 0666
cmd/testandroid.go: fixed osopen
cmd/testdraw2d.go:45:30: rewrote os.Open with O_CREATE but not O_TRUNC to 
os.Create
cmd/testdraw2d.go:45:12: rewrote os.Open to os.Create with permission not 0666
cmd/testdraw2d.go: fixed osopen
cmd/testgopher.go:43:30: rewrote os.Open with O_CREATE but not O_TRUNC to 
os.Create
cmd/testgopher.go:43:12: rewrote os.Open to os.Create with permission not 0666
cmd/testgopher.go: fixed osopen
cmd/testimage.go:17:30: rewrote os.Open with O_CREATE but not O_TRUNC to 
os.Create
cmd/testimage.go:17:12: rewrote os.Open to os.Create with permission not 0666
cmd/testimage.go: fixed osopen
cmd/testpostscript.go:20:30: rewrote os.Open with O_CREATE but not O_TRUNC to 
os.Create
cmd/testpostscript.go:20:12: rewrote os.Open to os.Create with permission not 
0666
cmd/testpostscript.go: fixed osopen
LICENSE:1:1: expected 'package', found 'IDENT' Copyright
Makefile:2:1: expected 'package', found 'IDENT' include
postscript/interpreter.go: fixed osopen
README:3:1: expected 'package', found 'IDENT' This
krasin@krasin7:~/go/go/src/pkg/draw2d.googlecode.com/hg$ make install
cd draw2d && make install
make[1]: Entering directory 
`/home/krasin/go/go/src/pkg/draw2d.googlecode.com/hg/draw2d'
make[1]: Nothing to be done for `install'.
make[1]: Leaving directory 
`/home/krasin/go/go/src/pkg/draw2d.googlecode.com/hg/draw2d'
cd postscript && make install
make[1]: Entering directory 
`/home/krasin/go/go/src/pkg/draw2d.googlecode.com/hg/postscript'
6g  -o _go_.6 operators_array.go operators_dictionary.go operators_misc.go 
procedure.go interpreter.go operators_conflict.go operators_graphics.go 
operators_relational.go scanner.go operators.go operators_control.go 
operators_math.go operators_stack.go 
rm -f _obj/draw2d.googlecode.com/hg/postscript.a
gopack grc _obj/draw2d.googlecode.com/hg/postscript.a _go_.6 
cp _obj/draw2d.googlecode.com/hg/postscript.a 
"/home/krasin/go/go/pkg/linux_amd64/draw2d.googlecode.com/hg/postscript.a"
make[1]: Leaving directory 
`/home/krasin/go/go/src/pkg/draw2d.googlecode.com/hg/postscript'

package main

import (
    "gopkg.in/llgcode/draw2d.v1"
    "image"
    "image/color"
)

func main() {
    width := 200
    height := 200
    img := image.NewRGBA(image.Rect(0, 0, width, height))
    gc := draw2d.NewGraphicContext(img)

    gc.SetStrokeColor(color.NRGBA{255, 255, 255, 255})
    gc.SetFillColor(color.NRGBA{255, 255, 255, 255})
    gc.Clear()

    gc.SetStrokeColor(color.NRGBA{255, 0, 0, 255})
    gc.SetLineWidth(1)

    // Draw a circle
    draw2d.Circle(gc, 100, 100, 50)
    gc.Stroke()

    draw2d.SaveToPngFile("circ.png", img)
}

Fix error when try to build telling that Hinting can't be nil. Instead of nil 
set NoHinting.

PathStorage.{RQuadCurveTo, RCubicCurveTo, and RArcTo} call themselves rather 
than their absolute counterparts.

Here is my code:
    //load background image
    file, err := os.Open("android.png")
    if err != nil {
        log.Fatal(err)
    }
    defer file.Close()  
    a, _, err := image.Decode(file)

    //load go icon image
    file2, err := os.Open("go.png")
    if err != nil {
        log.Fatal(err)
    }
    defer file2.Close()
    g, _, err := image.Decode(file2)

    if err != nil {
        log.Fatal(err)
    }

    ar := a.Bounds()
    w, h, x := ar.Dx(), ar.Dy(), 30.0
    i := image.NewRGBA(image.Rect(0, 0, w, h))
    draw.Draw(i, ar, a, ar.Min, draw.Src)

    tr := draw2d.NewRotationMatrix(x*(math.Pi / 180.0))
    draw2d.DrawImage(g, i, tr, draw.Src, draw2d.LinearFilter)
    saveToPngFile("Test2", i)

I'm trying to rotate + paste an small image to the background image.
But you can see like the attachment image, why it leave the ugly black hole??
This is a bug or my misstake?
Thanks for your help!

Freetype-go uses float64 for DPI, so there are some small type errors.  The 
attached patch seems to fix it.

arc.go:38: unreachable code
arc.go:67: unreachable code
arc.go:59: code.google.com/p/freetype-go/freetype/raster.Point composite literal uses unkeyed fields
arc.go:65: code.google.com/p/freetype-go/freetype/raster.Point composite literal uses unkeyed fields
arc.go:67: code.google.com/p/freetype-go/freetype/raster.Point composite literal uses unkeyed fields
path_adder.go:26: code.google.com/p/freetype-go/freetype/raster.Point composite literal uses unkeyed fields
path_adder.go:28: code.google.com/p/freetype-go/freetype/raster.Point composite literal uses unkeyed fields
path_adder.go:40: code.google.com/p/freetype-go/freetype/raster.Point composite literal uses unkeyed fields
path_adder.go:49: code.google.com/p/freetype-go/freetype/raster.Point composite literal uses unkeyed fields
path_adder.go:53: code.google.com/p/freetype-go/freetype/raster.Point composite literal uses unkeyed fields
path_adder.go:56: code.google.com/p/freetype-go/freetype/raster.Point composite literal uses unkeyed fields
path_adder.go:56: code.google.com/p/freetype-go/freetype/raster.Point composite literal uses unkeyed fields
path_adder.go:59: code.google.com/p/freetype-go/freetype/raster.Point composite literal uses unkeyed fields
path_adder.go:59: code.google.com/p/freetype-go/freetype/raster.Point composite literal uses unkeyed fields
path_adder.go:59: code.google.com/p/freetype-go/freetype/raster.Point composite literal uses unkeyed fields
exit status 1

What steps will reproduce the problem?
1. cd go/src/pkg/draw2d.googlecode.com/hg/draw2d
2. hg pull && hg update
3. goinstall .

What is the expected output? What do you see instead?
Expected: no output 
Instead: image.go:80: not enough arguments in call to draw.Draw

What version of the product are you using? On what operating system?
Using go tip and draw2d tip

Please provide any additional information below.

Fix:

diff -r dfc88bbb5ba2 draw2d/image.go
--- a/draw2d/image.go   Wed Jun 08 00:31:06 2011 +0200
+++ b/draw2d/image.go   Sun Jul 03 02:14:46 2011 +0200
@@ -77,7 +77,7 @@

 func (gc *ImageGraphicContext) ClearRect(x1, y1, x2, y2 int) {
        imageColor := image.NewColorImage(gc.Current.FillColor)
-       draw.Draw(gc.img, image.Rect(x1, y1, x2, y2), imageColor, image.ZP)
+       draw.Draw(gc.img, image.Rect(x1, y1, x2, y2), imageColor, image.ZP, 
draw.Over)
 }

 func (gc *ImageGraphicContext) DrawImage(img image.Image) {

Postscript GraphicContext with minimal support for text.

These pages have out of date installation/package location information:

* http://code.google.com/p/draw2d/
* http://code.google.com/p/draw2d/wiki/GettingStarted

What steps will reproduce the problem?
1. go get code.google.com/p/draw2d
2. go build  go build code.google.com/p/draw2d/draw2d/curve


What is the expected output? What do you see instead?
should cleanly exit.

instead:

can't load package: package code.google.com/p/draw2d/draw2d/curve: found 
packages arc.go (draw2d) and cubic_float64.go (curve) in 
/home/cryptix/go/src/code.google.com/p/draw2d/draw2d/curve


Draw2d Package version , Go version ?
latest master, go 1.4

Please provide any additional information below.

I changed the package to curve and changed the return in the for-loop to a 
break. Please see the attached patch-file.


My main incentive for this fix is that godoc -analysis fails if it can't load 
all packages in $GOPATH.

What steps will reproduce the problem?

make install 

What is the expected output? What do you see instead?

paint.go:49: nrgba.RGBA undefined (type uint8 has no field or method RGBA)
paint.go:59: cannot use struct literal (type image.NRGBAColor) as type uint8 in 
assignment
paint.go:63: nrgba.RGBA undefined (type uint8 has no field or method RGBA)
paint.go:73: cannot use struct literal (type image.NRGBAColor) as type uint8 in 
assignment
make[1]: *** [_go_.6] Error 1
make[1]: Leaving directory `/home/zzzzrrr/workspace/draw2d/draw2d'
make: *** [install] Error 2

What version of the product are you using? On what operating system?

Ubuntu x64
6g version weekly.2011-07-29 9332

What steps will reproduce the problem?
1.Copy the Fill String demo code
2. Use "go run" to run the code

What is the expected output? What do you see instead?
The code try to get the font data from a specific folder, of cource the folder 
does not exit:
2012/04/19 22:41:21 open ../resource/font/luximbi.ttf: no such file or directory
2012/04/19 22:41:21 open ../resource/font/luxisr.ttf: no such file or directory
width: 0.000000
2012/04/19 22:41:21 open ../resource/font/luximbi.ttf: no such file or directory
2012/04/19 22:41:21 open ../resource/font/luxisr.ttf: no such file or directory
Wrote TestFillString.png OK.
____________________________
How can I edit the location of the font?
I have attach my source file if you need more infomation.

Patch to build against weekly.2011.12.22

Gofix (image.Color/color.Color, math, namespace/imports)
Update instances of int in postscript to rune type

It appears that MiterJoin doesn't do anything at all. From reading the source 
code, if the Join style is not RoundJoin or BevelJoin, then the Joiner returned 
is the RoundJoiner. Although in my case, RoundJoin doesn't seem to work either 
(I always get a bevel).

What steps will reproduce the problem?
1. Run the following code:

a := uint8(150)
palette := [...]image.Color {
    image.RGBAColor{95, 119, 0, a},
    image.RGBAColor{157, 196, 0, a},
    image.RGBAColor{120, 64, 0, a},
    image.RGBAColor{196, 105, 0, a},
    image.RGBAColor{135, 135, 0, a},
};

img := image.NewRGBA(500, 200)
gc := draw2d.NewGraphicContext(img)

for row := 0; row < 2; row++ {
    sa := uint8(255)
    if row == 1 {
        sa = 0
    }
    gc.SetStrokeColor(image.RGBAColor{0, 0, 0, sa})
    for i := 0; i < 5; i++ {
        gc.SetFillColor(palette[i])
        draw2d.Circle(gc, float64(45 * i + 50), float64(50 + 100 * row), 40)
        gc.FillStroke()
    }
}

png.Encode(w, img)

2. View the resulting PNG file

What is the expected output?

Two rows of intersecting circles, top row with borders, bottom row without 
borders, nicely anti-aliased at the edges.

What do you see instead?

AA is broken between certain colors.

What version of the product are you using? On what operating system?

Rev db69b22ef193, with freetype-go at rev fc42a8016807. Go release 60.2 (as 
part of app-engine SDK 1.5.5)

Attaching the resulting PNG file.

philip@philip-VirtualBox:~$ sudo goinstall -v draw2d.googlecode.com/hg/draw2d
goinstall: image/draw: skipping standard library
goinstall: code.google.com/p/freetype-go/freetype/truetype: download
goinstall: code.google.com/p/freetype-go/freetype/truetype: cannot download: 
code.google.com/p/freetype-go/freetype/truetype ($GOPATH not set)
goinstall: image: skipping standard library
goinstall: code.google.com/p/freetype-go/freetype: download
goinstall: code.google.com/p/freetype-go/freetype: cannot download: 
code.google.com/p/freetype-go/freetype ($GOPATH not set)
goinstall: code.google.com/p/freetype-go/freetype/raster: download
goinstall: code.google.com/p/freetype-go/freetype/raster: cannot download: 
code.google.com/p/freetype-go/freetype/raster ($GOPATH not set)
goinstall: image/color: go/build: package could not be found locally ($GOPATH 
not set)
goinstall: log: skipping standard library
goinstall: math: skipping standard library
goinstall: path: skipping standard library
goinstall: fmt: skipping standard library
goinstall: io/ioutil: skipping standard library
philip@philip-VirtualBox:~$ 

image.go:166: cannot use nil as type truetype.Hinting in function argument
image.go:225: cannot use nil as type truetype.Hinting in function argument

Is there a way to do clipping?

What steps will reproduce the problem?
1. Fresh Go installation
2. goinstall draw2d.googlecode.com/hg/draw2d 

What is the expected output? What do you see instead?

The package should get installed.

goinstall: image/color: go/build: package could not be found locally ($GOPATH 
not set)

What version of the product are you using? On what operating system?

Go release.r60.1, Mac OS X Lion

Please provide any additional information below.

I tried to figure out where to set GOPATH to, which made the ($GOPATH not set) 
part disappear, but I haven't been able to figure out how to fix it.

What steps will reproduce the problem?
1. go get -v code.google.com/p/draw2d/draw2d

What is the expected output? What do you see instead?
# code.google.com/p/draw2d/draw2d
draw2d/draw2d/image.go:166: cannot use nil as type truetype.Hinting in function 
argument
draw2d/draw2d/image.go:225: cannot use nil as type truetype.Hinting in function 
argument


Draw2d Package version: latest, Go version 1.2


Please provide any additional information below.

I fixed this as follows:
cmccabe@keter:~/gopath/src/code.google.com/p/draw2d> hg diff
diff -r ec77dc18b964 draw2d/image.go
--- a/draw2d/image.go   Tue May 28 22:48:35 2013 -0400
+++ b/draw2d/image.go   Wed Feb 12 19:50:47 2014 -0800
@@ -163,7 +163,7 @@
 }

 func (gc *ImageGraphicContext) drawGlyph(glyph truetype.Index, dx, dy float64) error {
-       if err := gc.glyphBuf.Load(gc.Current.font, gc.Current.scale, glyph, 
nil); err != nil {
+       if err := gc.glyphBuf.Load(gc.Current.font, gc.Current.scale, glyph, 
truetype.NoHinting); err != nil {
                return err
        }
        e0 := 0
@@ -222,7 +222,7 @@
                if hasPrev {
                        cursor += fUnitsToFloat64(font.Kerning(gc.Current.scale, prev, index))
                }
-               if err := gc.glyphBuf.Load(gc.Current.font, gc.Current.scale, 
index, nil); err != nil {
+               if err := gc.glyphBuf.Load(gc.Current.font, gc.Current.scale, 
index, truetype.NoHinting); err != nil {
                        log.Println(err)
                        return 0, 0, 0, 0
                }

What steps will reproduce the problem?

goinstall draw2d.googlecode.com/hg/draw2d


What is the expected output? What do you see instead?

/bin/bash: === cd 
/Users/abaumann/goinstall_base/src/freetype-go.googlecode.com/hg/freetype; bash 
gomake -f- install
6g -I "/Users/abaumann/go/pkg/darwin_amd64" -I 
"/Users/abaumann/goinstall_base/pkg/darwin_amd64"  -o _go_.6 freetype.go 
freetype.go:180: cannot use image.Rect(0, 0, xmax - xmin, ymax - ymin) (type 
image.Rectangle) as type int in function argument
freetype.go:180: not enough arguments in call to image.NewAlpha
make: *** [_go_.6] Error 1
--- exit status 2
goinstall: freetype-go.googlecode.com/hg/freetype: install: running bash: exit 
status 2


What version of the product are you using? On what operating system?

OSX Lion

Please provide any additional information below.

I use the current release of go (16.09.2011 weekly)

Purpose of code changes on this branch:

Changes for Rectangle structure definition

When reviewing my code changes, please focus on:

I modified image package. It is a big change.
I raise review request for that. This changes are sync to the new image package

After the review, I'll merge this branch into:
/trunk

PDF GraphicContext using this project https://bitbucket.org/zombiezen/gopdf/

$ goinstall draw2d.goog
$ sudo goinstall draw2d.googlecode.com/hg/draw2d 
/bin/bash: === cd /usr/lib/go/src/pkg/draw2d.googlecode.com/hg/draw2d; bash 
gomake -f- install
6g -I "/usr/lib/go/pkg/linux_amd64"  -o _go_.6 dasher.go advanced_path.go 
transform.go stroker.go paint.go path_converter.go math.go curves.go 
stack_gc.go rgba_interpolation.go path_storage.go demux_converter.go gc.go 
path_adder.go path.go image.go font.go arc.go vertex2d.go 
image.go:80: not enough arguments in call to draw.Draw
make: *** [_go_.6] Error 1
--- exit status 2

What steps will reproduce the problem?
In environments like AppEngine or Heroku, we can't rely on file system access 
being available to the web app always. Trying to use fonts gives go runtime 
error of unable to access file resource

What is the expected output? What do you see instead?
If we can have generic versions of the Font functions that can be passed  font 
file data as a byte slice OR a Reader, we can use the font functions in 
environments where file access is not available.

There should be a space between the copyright notice comments and the package 
declaration statements.  If you look at the godoc output for this package 
(http://gopkgdoc.appspot.com/pkg/code.google.com/p/draw2d/draw2d) you will 
notice that godoc thinks the copyright notices are part of the package 
description.

What steps will reproduce the problem?

Set up a rotation
Draw text

What is the expected output? What do you see instead?

The text should be rotated.  Instead, the text is drawn smaller
without rotation.

What steps will reproduce the problem?
-- not applicable --

Please provide any additional information below.

This document shouldn't be in the repository.

http://code.google.com/p/draw2d/source/browse/doc/PLRM.pdf

Please check out the copyrights page included in it.

I would like to have a function to create a GraphicContext using an exotic 
image type I implemented. It could be basically a modified version of 
NewGraphicContext taking a painter as parameter like the one at the end of this 
message.

Regards,
Michael

////////////////////////
func NewGraphicContext2(img draw.Image, painter Painter) *ImageGraphicContext {
    width, height := img.Bounds().Dx(), img.Bounds().Dy()
    dpi := 92
    ftContext := freetype.NewContext()
    ftContext.SetDPI(dpi)
    ftContext.SetClip(img.Bounds())
    ftContext.SetDst(img)
    gc := &ImageGraphicContext{
        NewStackGraphicContext(),
        img,
        painter,
        raster.NewRasterizer(width, height),
        raster.NewRasterizer(width, height),
        ftContext,
        dpi,
    }
    return gc
}

can you please include the wingui example?

What steps will reproduce the problem?

$ go get -u code.google.com/p/draw2d/draw2d/
# code.google.com/p/draw2d/draw2d
/home/mischief/code/go/src/code.google.com/p/draw2d/draw2d/image.go:166: cannot 
use nil as type truetype.Hinting in function argument
/home/mischief/code/go/src/code.google.com/p/draw2d/draw2d/image.go:225: cannot 
use nil as type truetype.Hinting in function argument

What is the expected output? What do you see instead?
no output - successful compilation.

Draw2d Package version , Go version ?
draw2d ec77dc18b964
go version devel +ae14bde9ce3c Wed Feb 05 07:32:16 2014 -0800 linux/amd64



you just need to replace 'nil' on these lines with either 0, or the correct 
constant from the truetype package.

gc.Current.Path = draw2d.NewPathStorage()