1 files changed, 21 insertions, 0 deletions

diff --git a/js/RrdGfxCanvas.js b/js/RrdGfxCanvas.js
index 324b655..6ba71bb 100644
--- a/js/RrdGfxCanvas.js
+++ b/js/RrdGfxCanvas.js
@@ -28,6 +28,9 @@ var RrdGfxCanvas = function(canvasId)
 {
         this.canvas = document.getElementById(canvasId);
         this.ctx = this.canvas.getContext('2d');
+        this.dash = false;
+  this.dash_offset = null;
+        this.dash_array = null;
 };
 
 RrdGfxCanvas.prototype.size = function (width, height)
@@ -38,7 +41,22 @@ RrdGfxCanvas.prototype.size = function (width, height)
 
 RrdGfxCanvas.prototype.set_dash = function (dashes, n, offset)
 {
+        this.dash = true;
+        this.dash_array = dashes;
+        this.dash_offset = offset;
+};
 
+RrdGfxCanvas.prototype._set_dash = function ()
+{
+        if (this.dash_array != undefined && this.dash_array.length > 0) {
+                this.ctx.setLineDash(this.dash_array);
+                if (this.dash_offset > 0) {
+                        this.ctx.lineDashOffset = this.dash_offset;
+                }
+        }
+        this.dash = false;
+        this.dash_array = null;
+        this.dash_offset = 0;
 };
 
 RrdGfxCanvas.prototype.line = function (X0, Y0, X1, Y1, width, color)
@@ -58,6 +76,7 @@ RrdGfxCanvas.prototype.line = function (X0, Y0, X1, Y1, width, color)
         this.ctx.save();
         this.ctx.lineWidth = width;
         this.ctx.strokeStyle = color;
+        if (this.dash) this._set_dash();
         this.ctx.beginPath();
         this.ctx.moveTo(X0, Y0);
         this.ctx.lineTo(X1, Y1);
@@ -136,6 +155,7 @@ RrdGfxCanvas.prototype.rectangle = function (X0, Y0, X1, Y1, width, style)
 
         this.ctx.save();
         this.ctx.beginPath();
+        if (this.dash) this._set_dash();
         this.ctx.lineWidth = width;
         this.ctx.moveTo(X0, Y0);
         this.ctx.lineTo(X1, Y0);
@@ -179,6 +199,7 @@ RrdGfxCanvas.prototype.stroke_begin = function (width, style)
 {
         this.ctx.save();
         this.ctx.beginPath();
+        if (this.dash) this._set_dash();
         this.ctx.lineWidth = width;
         this.ctx.strokeStyle = style;
         this.ctx.lineCap = 'round';