[gjs/cairo: 17/18] [cairo] Add examples

[Johan Dahlin <johan src gnome org>]

commit cd71789caea31d35b8a2c6b8ceb9800d25af7fbf
Author: Johan Dahlin <johan gnome org>
Date:   Sun Feb 21 16:00:11 2010 -0300

    [cairo] Add examples

 Makefile-examples.am                |    9 +++++
 examples/cairo/fill.js              |   11 ++++++
 examples/cairo/mask.js              |   19 +++++++++++
 examples/cairo/paint.js             |   10 ++++++
 examples/cairo/path-close.js        |   20 ++++++++++++
 examples/cairo/poppler-gdk.js       |   58 +++++++++++++++++++++++++++++++++++
 examples/cairo/setsourcegradient.js |   32 +++++++++++++++++++
 examples/cairo/setsourcergba.js     |   28 +++++++++++++++++
 examples/cairo/showtext.js          |   17 ++++++++++
 examples/cairo/stroke.js            |   13 ++++++++
 10 files changed, 217 insertions(+), 0 deletions(-)
---
diff --git a/Makefile-examples.am b/Makefile-examples.am
index 70d59a0..7f2291f 100644
--- a/Makefile-examples.am
+++ b/Makefile-examples.am
@@ -1,4 +1,13 @@
 EXTRA_DIST +=			        \
+	examples/cairo/fill.js                 \
+	examples/cairo/mask.js                 \
+	examples/cairo/paint.js                 \
+	examples/cairo/path-close.js                 \
+	examples/cairo/poppler-gdk.js                 \
+	examples/cairo/setsourcegradient.js                 \
+	examples/cairo/setsourcergba.js                 \
+	examples/cairo/showtext.js                 \
+	examples/cairo/stroke.js                 \
 	examples/clutter.js		\
 	examples/gio-cat.js                 \
 	examples/gtk.js                 \
diff --git a/examples/cairo/fill.js b/examples/cairo/fill.js
new file mode 100644
index 0000000..cc2a036
--- /dev/null
+++ b/examples/cairo/fill.js
@@ -0,0 +1,11 @@
+const Cairo = imports.cairo;
+
+let surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, 120, 120);
+let cr = new Cairo.Context(surface);
+cr.scale(120, 120);
+
+cr.setSourceRGB(0, 0, 0);
+cr.rectangle(0.25, 0.25, 0.5, 0.5);
+cr.fill();
+
+surface.writeToPNG("fill.png");
diff --git a/examples/cairo/mask.js b/examples/cairo/mask.js
new file mode 100644
index 0000000..a3dd341
--- /dev/null
+++ b/examples/cairo/mask.js
@@ -0,0 +1,19 @@
+const Cairo = imports.cairo;
+
+let surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, 120, 120);
+let cr = new Cairo.Context(surface);
+cr.scale(120, 120);
+
+let linpat = new Cairo.LinearGradient(0, 0, 1, 1);
+linpat.addColorStopRGB(0, 0, 0.3, 0.8);
+linpat.addColorStopRGB(1, 0, 0.8, 0.3);
+
+let radpat = new Cairo.RadialGradient(0.5, 0.5, 0.25, 0.5, 0.5, 0.75);
+radpat.addColorStopRGBA(0, 0, 0, 0, 1);
+radpat.addColorStopRGBA(0.5, 0, 0, 0, 0);
+
+cr.setSource(linpat);
+
+cr.mask(radpat);
+
+surface.writeToPNG("mask.png");
diff --git a/examples/cairo/paint.js b/examples/cairo/paint.js
new file mode 100644
index 0000000..4c53280
--- /dev/null
+++ b/examples/cairo/paint.js
@@ -0,0 +1,10 @@
+const Cairo = imports.cairo;
+
+let surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, 120, 120);
+let cr = new Cairo.Context(surface);
+cr.scale(120, 120);
+
+cr.setSourceRGB(0.0, 0.0, 0.0);
+cr.paintWithAlpha(0.5);
+
+surface.writeToPNG("paint.png");
diff --git a/examples/cairo/path-close.js b/examples/cairo/path-close.js
new file mode 100644
index 0000000..62c391a
--- /dev/null
+++ b/examples/cairo/path-close.js
@@ -0,0 +1,20 @@
+const Cairo = imports.cairo;
+
+let surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, 120, 120);
+let cr = new Cairo.Context(surface);
+cr.scale(120, 120);
+
+cr.setLineWidth(0.1);
+cr.setSourceRGB(0, 0, 0);
+
+cr.moveTo(0.25, 0.25);
+cr.lineTo(0.5, 0.375);
+cr.relLineTo(0.25, -0.125);
+cr.arc(0.5, 0.5, 0.25 * Math.sqrt(2), -0.25 * Math.PI, 0.25 * Math.PI);
+cr.relCurveTo(-0.25, -0.125, -0.25, 0.125, -0.5, 0);
+cr.closePath();
+
+cr.stroke();
+
+surface.writeToPNG("path-close.png");
+
diff --git a/examples/cairo/poppler-gdk.js b/examples/cairo/poppler-gdk.js
new file mode 100644
index 0000000..14ef578
--- /dev/null
+++ b/examples/cairo/poppler-gdk.js
@@ -0,0 +1,58 @@
+const Cairo = imports.cairo;
+const Lang = imports.lang;
+
+const Gdk = imports.gi.Gdk;
+const Gtk = imports.gi.Gtk;
+const Poppler = imports.gi.Poppler;
+
+function PopplerApp(filename) {
+    this._init(filename);
+}
+
+PopplerApp.prototype = {
+    _init : function(filename) {
+        this._uri = "file://" + filename;
+        this._document = Poppler.Document.new_from_file(this._uri, "");
+        this._buildUI();
+    },
+
+    _buildUI : function() {
+        this._window = new Gtk.Window({ type: Gtk.WindowType.TOPLEVEL });
+        this._window.connect("destroy", Lang.bind(this, this._onWindowDestroy));
+
+        let da = new Gtk.DrawingArea();
+        da.connect("expose-event", Lang.bind(this, this._onDrawingAreaExpose));
+        this._window.add(da);
+    },
+
+    _onDrawingAreaExpose : function(window, event) {
+        let cr = Gdk.cairo_create(window.window);
+        //let page = this._document.get_page(0);
+        //page.render(cr);
+    },
+
+    _onWindowDestroy : function(window) {
+        Gtk.main_quit();
+    },
+
+    run : function() {
+        this._window.show_all();
+        Gtk.main();
+    }
+
+}
+
+function main() {
+    if (ARGV.length == 0) {
+        printerr("Need a filename");
+        return 1;
+    }
+
+    Gtk.init(0, null);
+
+    let app = new PopplerApp(ARGV[0]);
+    app.run();
+    return 0;
+}
+
+main();
diff --git a/examples/cairo/setsourcegradient.js b/examples/cairo/setsourcegradient.js
new file mode 100644
index 0000000..8981213
--- /dev/null
+++ b/examples/cairo/setsourcegradient.js
@@ -0,0 +1,32 @@
+const Cairo = imports.cairo;
+
+let surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, 120, 120);
+let cr = new Cairo.Context(surface);
+cr.scale(120, 120);
+
+let radpat = new Cairo.RadialGradient(0.25, 0.25, 0.1, 0.5, 0.5, 0.5);
+radpat.addColorStopRGB(0, 1.0, 0.8, 0.8);
+radpat.addColorStopRGB(1, 0.9, 0.0, 0.0);
+
+for (let i = 1; i < 10; ++i) {
+    for (let j = 1; j < 10; ++j) {
+        cr.rectangle(i/10.0 - 0.04, j/10.0 -0.04, 0.08, 0.08);
+    }
+}
+
+cr.setSource(radpat);
+cr.fill();
+
+let linpat = new Cairo.LinearGradient(0.25, 0.35, 0.75, 0.65);
+linpat.addColorStopRGBA(0.00, 1, 1, 1, 0);
+linpat.addColorStopRGBA(0.25, 0, 1, 0, 0.5);
+linpat.addColorStopRGBA(0.50, 1, 1, 1, 0);
+linpat.addColorStopRGBA(0.75, 0, 0, 1, 0.5);
+linpat.addColorStopRGBA(1.00, 1, 1, 1, 0);
+
+cr.rectangle(0.0, 0.0, 1, 1);
+cr.setSource(linpat);
+cr.fill();
+
+surface.writeToPNG("setsourcegradient.png");
+
diff --git a/examples/cairo/setsourcergba.js b/examples/cairo/setsourcergba.js
new file mode 100644
index 0000000..99a064d
--- /dev/null
+++ b/examples/cairo/setsourcergba.js
@@ -0,0 +1,28 @@
+const Cairo = imports.cairo;
+
+let surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, 120, 120);
+let cr = new Cairo.Context(surface);
+cr.scale(120, 120);
+
+cr.setSourceRGB(0, 0, 0);
+cr.moveTo(0, 0);
+cr.lineTo(1, 1);
+cr.moveTo(1, 0);
+cr.lineTo(0, 1);
+cr.setLineWidth(0.2);
+cr.stroke();
+
+cr.rectangle(0, 0, 0.5, 0.5);
+cr.setSourceRGBA(1, 0, 0, 0.80);
+cr.fill();
+
+cr.rectangle(0, 0.5, 0.5, 0.5);
+cr.setSourceRGBA(0, 1, 0, 0.60);
+cr.fill();
+
+cr.rectangle(0.5, 0, 0.5, 0.5);
+cr.setSourceRGBA(0, 0, 1, 0.40);
+cr.fill();
+
+surface.writeToPNG("setsourcergba.png");
+
diff --git a/examples/cairo/showtext.js b/examples/cairo/showtext.js
new file mode 100644
index 0000000..6fb364c
--- /dev/null
+++ b/examples/cairo/showtext.js
@@ -0,0 +1,17 @@
+const Cairo = imports.cairo;
+
+let surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, 120, 120);
+let cr = new Cairo.Context(surface);
+cr.scale(120, 120);
+
+cr.setSourceRGB(0, 0, 0);
+cr.selectFontFace("Georgia", Cairo.FontSlant.NORMAL, Cairo.FontWeight.BOLD);
+cr.setFontSize(1.2);
+
+//let te = cr.text_extents("a");
+//cr.moveTo(0.5 - te.width / 2 - te.xBearing,
+//          0.5 - te.height / 2 - te.yBearing);
+cr.showText("a");
+
+surface.writeToPNG("showtext.png");
+
diff --git a/examples/cairo/stroke.js b/examples/cairo/stroke.js
new file mode 100644
index 0000000..821d55a
--- /dev/null
+++ b/examples/cairo/stroke.js
@@ -0,0 +1,13 @@
+const Cairo = imports.cairo;
+
+let surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, 120, 120);
+let cr = new Cairo.Context(surface);
+cr.scale(120, 120);
+
+cr.setLineWidth(0.1);
+cr.setSourceRGB(0, 0, 0);
+cr.rectangle(0.25, 0.25, 0.5, 0.5);
+cr.stroke();
+
+surface.writeToPNG("stroke.png");
+