From 90e3ccb2b773331aa81463298c2ccb314604ab8c Mon Sep 17 00:00:00 2001
From: Neil Fraser <fraser@google.com>
Date: Sun, 4 Oct 2015 07:15:18 -0700
Subject: [PATCH] Add Blockly.BlockSvg.START_HAT option.

---
 blockly_compressed.js | 23 ++++++++++++-----------
 core/block_svg.js     | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+), 11 deletions(-)

diff --git a/blockly_compressed.js b/blockly_compressed.js
index 315067cde..71da84a84 100644
--- a/blockly_compressed.js
+++ b/blockly_compressed.js
@@ -1086,13 +1086,13 @@ Blockly.BlockSvg.prototype.onMouseMove_=function(a){var b=this,c=this.workspace;
 c.recordDeleteAreas());if(2==Blockly.dragMode_){var g=d.x-b.dragStartXY_.x,d=d.y-b.dragStartXY_.y;f.translate_="translate("+e.x+","+e.y+")";f.setAttribute("transform",f.translate_+f.skew_);for(e=0;e<b.draggedBubbles_.length;e++)f=b.draggedBubbles_[e],f.bubble.setIconLocation(f.x+g,f.y+d);for(var f=b.getConnections_(!1),h=null,k=null,l=Blockly.SNAP_RADIUS,e=0;e<f.length;e++){var q=f[e],m=q.closest(l,g,d);m.connection&&(h=m.connection,k=q,l=m.radius)}Blockly.highlightedConnection_&&Blockly.highlightedConnection_!=
 h&&(Blockly.highlightedConnection_.unhighlight(),Blockly.highlightedConnection_=null,Blockly.localConnection_=null);h&&h!=Blockly.highlightedConnection_&&(h.highlight(),Blockly.highlightedConnection_=h,Blockly.localConnection_=k);b.isDeletable()&&c.isDeleteArea(a)}}a.stopPropagation()})};Blockly.BlockSvg.prototype.updateMovable=function(){this.isMovable()?Blockly.addClass_(this.svgGroup_,"blocklyDraggable"):Blockly.removeClass_(this.svgGroup_,"blocklyDraggable")};
 Blockly.BlockSvg.prototype.setMovable=function(a){Blockly.BlockSvg.superClass_.setMovable.call(this,a);this.updateMovable()};Blockly.BlockSvg.prototype.setEditable=function(a){Blockly.BlockSvg.superClass_.setEditable.call(this,a);if(this.rendered)for(a=0;a<this.icons_.length;a++)this.icons_[a].updateEditable()};Blockly.BlockSvg.prototype.getSvgRoot=function(){return this.svgGroup_};Blockly.BlockSvg.SEP_SPACE_X=10;Blockly.BlockSvg.SEP_SPACE_Y=10;Blockly.BlockSvg.INLINE_PADDING_Y=5;
-Blockly.BlockSvg.MIN_BLOCK_Y=25;Blockly.BlockSvg.TAB_HEIGHT=20;Blockly.BlockSvg.TAB_WIDTH=8;Blockly.BlockSvg.NOTCH_WIDTH=30;Blockly.BlockSvg.CORNER_RADIUS=8;Blockly.BlockSvg.DISTANCE_45_INSIDE=(1-Math.SQRT1_2)*(Blockly.BlockSvg.CORNER_RADIUS-.5)+.5;Blockly.BlockSvg.DISTANCE_45_OUTSIDE=(1-Math.SQRT1_2)*(Blockly.BlockSvg.CORNER_RADIUS+.5)-.5;Blockly.BlockSvg.NOTCH_PATH_LEFT="l 6,4 3,0 6,-4";Blockly.BlockSvg.NOTCH_PATH_LEFT_HIGHLIGHT="l 6,4 3,0 6,-4";Blockly.BlockSvg.NOTCH_PATH_RIGHT="l -6,4 -3,0 -6,-4";
-Blockly.BlockSvg.JAGGED_TEETH="l 8,0 0,4 8,4 -16,8 8,4";Blockly.BlockSvg.JAGGED_TEETH_HEIGHT=20;Blockly.BlockSvg.JAGGED_TEETH_WIDTH=15;Blockly.BlockSvg.TAB_PATH_DOWN="v 5 c 0,10 -"+Blockly.BlockSvg.TAB_WIDTH+",-8 -"+Blockly.BlockSvg.TAB_WIDTH+",7.5 s "+Blockly.BlockSvg.TAB_WIDTH+",-2.5 "+Blockly.BlockSvg.TAB_WIDTH+",7.5";
-Blockly.BlockSvg.TAB_PATH_DOWN_HIGHLIGHT_RTL="v 6.5 m -"+.97*Blockly.BlockSvg.TAB_WIDTH+",3 q -"+.05*Blockly.BlockSvg.TAB_WIDTH+",10 "+.3*Blockly.BlockSvg.TAB_WIDTH+",9.5 m "+.67*Blockly.BlockSvg.TAB_WIDTH+",-1.9 v 1.4";Blockly.BlockSvg.TOP_LEFT_CORNER_START="m 0,"+Blockly.BlockSvg.CORNER_RADIUS;Blockly.BlockSvg.TOP_LEFT_CORNER_START_HIGHLIGHT_RTL="m "+Blockly.BlockSvg.DISTANCE_45_INSIDE+","+Blockly.BlockSvg.DISTANCE_45_INSIDE;
-Blockly.BlockSvg.TOP_LEFT_CORNER_START_HIGHLIGHT_LTR="m 0.5,"+(Blockly.BlockSvg.CORNER_RADIUS-.5);Blockly.BlockSvg.TOP_LEFT_CORNER="A "+Blockly.BlockSvg.CORNER_RADIUS+","+Blockly.BlockSvg.CORNER_RADIUS+" 0 0,1 "+Blockly.BlockSvg.CORNER_RADIUS+",0";Blockly.BlockSvg.TOP_LEFT_CORNER_HIGHLIGHT="A "+(Blockly.BlockSvg.CORNER_RADIUS-.5)+","+(Blockly.BlockSvg.CORNER_RADIUS-.5)+" 0 0,1 "+Blockly.BlockSvg.CORNER_RADIUS+",0.5";
-Blockly.BlockSvg.INNER_TOP_LEFT_CORNER=Blockly.BlockSvg.NOTCH_PATH_RIGHT+" h -"+(Blockly.BlockSvg.NOTCH_WIDTH-15-Blockly.BlockSvg.CORNER_RADIUS)+" h -0.5 a "+Blockly.BlockSvg.CORNER_RADIUS+","+Blockly.BlockSvg.CORNER_RADIUS+" 0 0,0 -"+Blockly.BlockSvg.CORNER_RADIUS+","+Blockly.BlockSvg.CORNER_RADIUS;Blockly.BlockSvg.INNER_BOTTOM_LEFT_CORNER="a "+Blockly.BlockSvg.CORNER_RADIUS+","+Blockly.BlockSvg.CORNER_RADIUS+" 0 0,0 "+Blockly.BlockSvg.CORNER_RADIUS+","+Blockly.BlockSvg.CORNER_RADIUS;
-Blockly.BlockSvg.INNER_TOP_LEFT_CORNER_HIGHLIGHT_RTL="a "+Blockly.BlockSvg.CORNER_RADIUS+","+Blockly.BlockSvg.CORNER_RADIUS+" 0 0,0 "+(-Blockly.BlockSvg.DISTANCE_45_OUTSIDE-.5)+","+(Blockly.BlockSvg.CORNER_RADIUS-Blockly.BlockSvg.DISTANCE_45_OUTSIDE);Blockly.BlockSvg.INNER_BOTTOM_LEFT_CORNER_HIGHLIGHT_RTL="a "+(Blockly.BlockSvg.CORNER_RADIUS+.5)+","+(Blockly.BlockSvg.CORNER_RADIUS+.5)+" 0 0,0 "+(Blockly.BlockSvg.CORNER_RADIUS+.5)+","+(Blockly.BlockSvg.CORNER_RADIUS+.5);
-Blockly.BlockSvg.INNER_BOTTOM_LEFT_CORNER_HIGHLIGHT_LTR="a "+(Blockly.BlockSvg.CORNER_RADIUS+.5)+","+(Blockly.BlockSvg.CORNER_RADIUS+.5)+" 0 0,0 "+(Blockly.BlockSvg.CORNER_RADIUS-Blockly.BlockSvg.DISTANCE_45_OUTSIDE)+","+(Blockly.BlockSvg.DISTANCE_45_OUTSIDE+.5);
+Blockly.BlockSvg.MIN_BLOCK_Y=25;Blockly.BlockSvg.TAB_HEIGHT=20;Blockly.BlockSvg.TAB_WIDTH=8;Blockly.BlockSvg.NOTCH_WIDTH=30;Blockly.BlockSvg.CORNER_RADIUS=8;Blockly.BlockSvg.START_HAT=!1;Blockly.BlockSvg.START_HAT_PATH="c 30,-15 70,-15 100,0";Blockly.BlockSvg.START_HAT_HIGHLIGHT_LTR="c 17.8,-9.2 45.3,-14.9 75,-8.7 M 100.5,0.5";Blockly.BlockSvg.START_HAT_HIGHLIGHT_RTL="m 25,-8.7 c 29.7,-6.2 57.2,-0.5 75,8.7";Blockly.BlockSvg.DISTANCE_45_INSIDE=(1-Math.SQRT1_2)*(Blockly.BlockSvg.CORNER_RADIUS-.5)+.5;
+Blockly.BlockSvg.DISTANCE_45_OUTSIDE=(1-Math.SQRT1_2)*(Blockly.BlockSvg.CORNER_RADIUS+.5)-.5;Blockly.BlockSvg.NOTCH_PATH_LEFT="l 6,4 3,0 6,-4";Blockly.BlockSvg.NOTCH_PATH_LEFT_HIGHLIGHT="l 6,4 3,0 6,-4";Blockly.BlockSvg.NOTCH_PATH_RIGHT="l -6,4 -3,0 -6,-4";Blockly.BlockSvg.JAGGED_TEETH="l 8,0 0,4 8,4 -16,8 8,4";Blockly.BlockSvg.JAGGED_TEETH_HEIGHT=20;Blockly.BlockSvg.JAGGED_TEETH_WIDTH=15;
+Blockly.BlockSvg.TAB_PATH_DOWN="v 5 c 0,10 -"+Blockly.BlockSvg.TAB_WIDTH+",-8 -"+Blockly.BlockSvg.TAB_WIDTH+",7.5 s "+Blockly.BlockSvg.TAB_WIDTH+",-2.5 "+Blockly.BlockSvg.TAB_WIDTH+",7.5";Blockly.BlockSvg.TAB_PATH_DOWN_HIGHLIGHT_RTL="v 6.5 m -"+.97*Blockly.BlockSvg.TAB_WIDTH+",3 q -"+.05*Blockly.BlockSvg.TAB_WIDTH+",10 "+.3*Blockly.BlockSvg.TAB_WIDTH+",9.5 m "+.67*Blockly.BlockSvg.TAB_WIDTH+",-1.9 v 1.4";Blockly.BlockSvg.TOP_LEFT_CORNER_START="m 0,"+Blockly.BlockSvg.CORNER_RADIUS;
+Blockly.BlockSvg.TOP_LEFT_CORNER_START_HIGHLIGHT_RTL="m "+Blockly.BlockSvg.DISTANCE_45_INSIDE+","+Blockly.BlockSvg.DISTANCE_45_INSIDE;Blockly.BlockSvg.TOP_LEFT_CORNER_START_HIGHLIGHT_LTR="m 0.5,"+(Blockly.BlockSvg.CORNER_RADIUS-.5);Blockly.BlockSvg.TOP_LEFT_CORNER="A "+Blockly.BlockSvg.CORNER_RADIUS+","+Blockly.BlockSvg.CORNER_RADIUS+" 0 0,1 "+Blockly.BlockSvg.CORNER_RADIUS+",0";
+Blockly.BlockSvg.TOP_LEFT_CORNER_HIGHLIGHT="A "+(Blockly.BlockSvg.CORNER_RADIUS-.5)+","+(Blockly.BlockSvg.CORNER_RADIUS-.5)+" 0 0,1 "+Blockly.BlockSvg.CORNER_RADIUS+",0.5";Blockly.BlockSvg.INNER_TOP_LEFT_CORNER=Blockly.BlockSvg.NOTCH_PATH_RIGHT+" h -"+(Blockly.BlockSvg.NOTCH_WIDTH-15-Blockly.BlockSvg.CORNER_RADIUS)+" h -0.5 a "+Blockly.BlockSvg.CORNER_RADIUS+","+Blockly.BlockSvg.CORNER_RADIUS+" 0 0,0 -"+Blockly.BlockSvg.CORNER_RADIUS+","+Blockly.BlockSvg.CORNER_RADIUS;
+Blockly.BlockSvg.INNER_BOTTOM_LEFT_CORNER="a "+Blockly.BlockSvg.CORNER_RADIUS+","+Blockly.BlockSvg.CORNER_RADIUS+" 0 0,0 "+Blockly.BlockSvg.CORNER_RADIUS+","+Blockly.BlockSvg.CORNER_RADIUS;Blockly.BlockSvg.INNER_TOP_LEFT_CORNER_HIGHLIGHT_RTL="a "+Blockly.BlockSvg.CORNER_RADIUS+","+Blockly.BlockSvg.CORNER_RADIUS+" 0 0,0 "+(-Blockly.BlockSvg.DISTANCE_45_OUTSIDE-.5)+","+(Blockly.BlockSvg.CORNER_RADIUS-Blockly.BlockSvg.DISTANCE_45_OUTSIDE);
+Blockly.BlockSvg.INNER_BOTTOM_LEFT_CORNER_HIGHLIGHT_RTL="a "+(Blockly.BlockSvg.CORNER_RADIUS+.5)+","+(Blockly.BlockSvg.CORNER_RADIUS+.5)+" 0 0,0 "+(Blockly.BlockSvg.CORNER_RADIUS+.5)+","+(Blockly.BlockSvg.CORNER_RADIUS+.5);Blockly.BlockSvg.INNER_BOTTOM_LEFT_CORNER_HIGHLIGHT_LTR="a "+(Blockly.BlockSvg.CORNER_RADIUS+.5)+","+(Blockly.BlockSvg.CORNER_RADIUS+.5)+" 0 0,0 "+(Blockly.BlockSvg.CORNER_RADIUS-Blockly.BlockSvg.DISTANCE_45_OUTSIDE)+","+(Blockly.BlockSvg.DISTANCE_45_OUTSIDE+.5);
 Blockly.BlockSvg.prototype.dispose=function(a,b,c){Blockly.Field.startCache();this.onchangeWrapper_&&(Blockly.unbindEvent_(this.onchangeWrapper_),this.onchangeWrapper_=null);Blockly.selected==this&&Blockly.terminateDrag_();Blockly.ContextMenu.currentBlock==this&&Blockly.ContextMenu.hide();this.unplug(a,!1);b&&this.rendered&&this.disposeUiEffect();this.rendered=!1;b=this.getIcons();for(c=0;c<b.length;c++)b[c].dispose();Blockly.BlockSvg.superClass_.dispose.call(this,a);goog.dom.removeNode(this.svgGroup_);
 this.svgPathDark_=this.svgPathLight_=this.svgPath_=this.svgGroup_=null;Blockly.Field.stopCache()};Blockly.BlockSvg.prototype.disposeUiEffect=function(){this.workspace.playAudio("delete");var a=Blockly.getSvgXY_(this.svgGroup_,this.workspace),b=this.svgGroup_.cloneNode(!0);b.translateX_=a.x;b.translateY_=a.y;b.setAttribute("transform","translate("+b.translateX_+","+b.translateY_+")");this.workspace.options.svg.appendChild(b);b.bBox_=b.getBBox();Blockly.BlockSvg.disposeUiStep_(b,this.RTL,new Date,this.workspace.scale)};
 Blockly.BlockSvg.disposeUiStep_=function(a,b,c,d){var e=(new Date-c)/150;1<e?goog.dom.removeNode(a):(a.setAttribute("transform","translate("+(a.translateX_+(b?-1:1)*a.bBox_.width*d/2*e)+","+(a.translateY_+a.bBox_.height*d*e)+") scale("+(1-e)*d+")"),setTimeout(function(){Blockly.BlockSvg.disposeUiStep_(a,b,c,d)},10))};
@@ -1115,10 +1115,11 @@ Blockly.NEXT_STATEMENT?Blockly.BlockSvg.INLINE:m.type,p.height=0,c.push(p));p.pu
 Blockly.NEXT_STATEMENT&&m.renderHeight--:m.renderHeight--;p.height=Math.max(p.height,m.renderHeight);m.fieldWidth=0;1==c.length&&(m.fieldWidth+=this.RTL?-a:a);for(var n=!1,r=0,t;t=m.fieldRow[r];r++){0!=r&&(m.fieldWidth+=Blockly.BlockSvg.SEP_SPACE_X);var u=t.getSize();t.renderWidth=u.width;t.renderSep=n&&t.EDITABLE?Blockly.BlockSvg.SEP_SPACE_X:0;m.fieldWidth+=t.renderWidth+t.renderSep;p.height=Math.max(p.height,u.height);n=t.EDITABLE}p.type!=Blockly.BlockSvg.INLINE&&(p.type==Blockly.NEXT_STATEMENT?
 (g=!0,e=Math.max(e,m.fieldWidth)):(p.type==Blockly.INPUT_VALUE?f=!0:p.type==Blockly.DUMMY_INPUT&&(h=!0),d=Math.max(d,m.fieldWidth)))}for(a=0;p=c[a];a++)if(p.thicker=!1,p.type==Blockly.BlockSvg.INLINE)for(b=0;m=p[b];b++)if(m.type==Blockly.INPUT_VALUE){p.height+=2*Blockly.BlockSvg.INLINE_PADDING_Y;p.thicker=!0;break}c.statementEdge=2*Blockly.BlockSvg.SEP_SPACE_X+e;g&&(c.rightEdge=Math.max(c.rightEdge,c.statementEdge+Blockly.BlockSvg.NOTCH_WIDTH));f?c.rightEdge=Math.max(c.rightEdge,d+2*Blockly.BlockSvg.SEP_SPACE_X+
 Blockly.BlockSvg.TAB_WIDTH):h&&(c.rightEdge=Math.max(c.rightEdge,d+2*Blockly.BlockSvg.SEP_SPACE_X));c.hasValue=f;c.hasStatement=g;c.hasDummy=h;return c};
-Blockly.BlockSvg.prototype.renderDraw_=function(a,b){if(this.outputConnection)this.squareBottomLeftCorner_=this.squareTopLeftCorner_=!0;else{this.squareBottomLeftCorner_=this.squareTopLeftCorner_=!1;if(this.previousConnection){var c=this.previousConnection.targetBlock();c&&c.getNextBlock()==this&&(this.squareTopLeftCorner_=!0)}this.getNextBlock()&&(this.squareBottomLeftCorner_=!0)}var d=this.getRelativeToSurfaceXY(),e=[],f=[],c=[],g=[];this.renderDrawTop_(e,c,d,b.rightEdge);var h=this.renderDrawRight_(e,
-c,f,g,d,b,a);this.renderDrawBottom_(e,c,d,h);this.renderDrawLeft_(e,c,d,h);d=e.join(" ")+"\n"+f.join(" ");this.svgPath_.setAttribute("d",d);this.svgPathDark_.setAttribute("d",d);d=c.join(" ")+"\n"+g.join(" ");this.svgPathLight_.setAttribute("d",d);this.RTL&&(this.svgPath_.setAttribute("transform","scale(-1 1)"),this.svgPathLight_.setAttribute("transform","scale(-1 1)"),this.svgPathDark_.setAttribute("transform","translate(1,1) scale(-1 1)"))};
-Blockly.BlockSvg.prototype.renderDrawTop_=function(a,b,c,d){this.squareTopLeftCorner_?(a.push("m 0,0"),b.push("m 0.5,0.5")):(a.push(Blockly.BlockSvg.TOP_LEFT_CORNER_START),b.push(this.RTL?Blockly.BlockSvg.TOP_LEFT_CORNER_START_HIGHLIGHT_RTL:Blockly.BlockSvg.TOP_LEFT_CORNER_START_HIGHLIGHT_LTR),a.push(Blockly.BlockSvg.TOP_LEFT_CORNER),b.push(Blockly.BlockSvg.TOP_LEFT_CORNER_HIGHLIGHT));this.previousConnection&&(a.push("H",Blockly.BlockSvg.NOTCH_WIDTH-15),b.push("H",Blockly.BlockSvg.NOTCH_WIDTH-15),
-a.push(Blockly.BlockSvg.NOTCH_PATH_LEFT),b.push(Blockly.BlockSvg.NOTCH_PATH_LEFT_HIGHLIGHT),this.previousConnection.moveTo(c.x+(this.RTL?-Blockly.BlockSvg.NOTCH_WIDTH:Blockly.BlockSvg.NOTCH_WIDTH),c.y));a.push("H",d);b.push("H",d-.5);this.width=d};
+Blockly.BlockSvg.prototype.renderDraw_=function(a,b){this.startHat_=!1;if(this.outputConnection)this.squareBottomLeftCorner_=this.squareTopLeftCorner_=!0;else{this.squareBottomLeftCorner_=this.squareTopLeftCorner_=!1;if(this.previousConnection){var c=this.previousConnection.targetBlock();c&&c.getNextBlock()==this&&(this.squareTopLeftCorner_=!0)}else Blockly.BlockSvg.START_HAT&&(this.startHat_=this.squareTopLeftCorner_=!0,b.rightEdge=Math.max(b.rightEdge,100));this.getNextBlock()&&(this.squareBottomLeftCorner_=
+!0)}var d=this.getRelativeToSurfaceXY(),e=[],f=[],c=[],g=[];this.renderDrawTop_(e,c,d,b.rightEdge);var h=this.renderDrawRight_(e,c,f,g,d,b,a);this.renderDrawBottom_(e,c,d,h);this.renderDrawLeft_(e,c,d,h);d=e.join(" ")+"\n"+f.join(" ");this.svgPath_.setAttribute("d",d);this.svgPathDark_.setAttribute("d",d);d=c.join(" ")+"\n"+g.join(" ");this.svgPathLight_.setAttribute("d",d);this.RTL&&(this.svgPath_.setAttribute("transform","scale(-1 1)"),this.svgPathLight_.setAttribute("transform","scale(-1 1)"),
+this.svgPathDark_.setAttribute("transform","translate(1,1) scale(-1 1)"))};
+Blockly.BlockSvg.prototype.renderDrawTop_=function(a,b,c,d){this.squareTopLeftCorner_?(a.push("m 0,0"),b.push("m 0.5,0.5"),this.startHat_&&(a.push(Blockly.BlockSvg.START_HAT_PATH),b.push(this.RTL?Blockly.BlockSvg.START_HAT_HIGHLIGHT_RTL:Blockly.BlockSvg.START_HAT_HIGHLIGHT_LTR))):(a.push(Blockly.BlockSvg.TOP_LEFT_CORNER_START),b.push(this.RTL?Blockly.BlockSvg.TOP_LEFT_CORNER_START_HIGHLIGHT_RTL:Blockly.BlockSvg.TOP_LEFT_CORNER_START_HIGHLIGHT_LTR),a.push(Blockly.BlockSvg.TOP_LEFT_CORNER),b.push(Blockly.BlockSvg.TOP_LEFT_CORNER_HIGHLIGHT));
+this.previousConnection&&(a.push("H",Blockly.BlockSvg.NOTCH_WIDTH-15),b.push("H",Blockly.BlockSvg.NOTCH_WIDTH-15),a.push(Blockly.BlockSvg.NOTCH_PATH_LEFT),b.push(Blockly.BlockSvg.NOTCH_PATH_LEFT_HIGHLIGHT),this.previousConnection.moveTo(c.x+(this.RTL?-Blockly.BlockSvg.NOTCH_WIDTH:Blockly.BlockSvg.NOTCH_WIDTH),c.y));a.push("H",d);b.push("H",d-.5);this.width=d};
 Blockly.BlockSvg.prototype.renderDrawRight_=function(a,b,c,d,e,f,g){for(var h,k=0,l,q,m=0,p;p=f[m];m++){h=Blockly.BlockSvg.SEP_SPACE_X;0==m&&(h+=this.RTL?-g:g);b.push("M",f.rightEdge-.5+","+(k+.5));if(this.isCollapsed()){var n=p[0];l=k;this.renderFields_(n.fieldRow,h,l);a.push(Blockly.BlockSvg.JAGGED_TEETH);b.push("h 8");n=p.height-Blockly.BlockSvg.JAGGED_TEETH_HEIGHT;a.push("v",n);this.RTL&&(b.push("v 3.9 l 7.2,3.4 m -14.5,8.9 l 7.3,3.5"),b.push("v",n-.7));this.width+=Blockly.BlockSvg.JAGGED_TEETH_WIDTH}else if(p.type==
 Blockly.BlockSvg.INLINE){for(var r=0;n=p[r];r++)l=k,p.thicker&&(l+=Blockly.BlockSvg.INLINE_PADDING_Y),h=this.renderFields_(n.fieldRow,h,l),n.type!=Blockly.DUMMY_INPUT&&(h+=n.renderWidth+Blockly.BlockSvg.SEP_SPACE_X),n.type==Blockly.INPUT_VALUE&&(c.push("M",h-Blockly.BlockSvg.SEP_SPACE_X+","+(k+Blockly.BlockSvg.INLINE_PADDING_Y)),c.push("h",Blockly.BlockSvg.TAB_WIDTH-2-n.renderWidth),c.push(Blockly.BlockSvg.TAB_PATH_DOWN),c.push("v",n.renderHeight+1-Blockly.BlockSvg.TAB_HEIGHT),c.push("h",n.renderWidth+
 2-Blockly.BlockSvg.TAB_WIDTH),c.push("z"),this.RTL?(d.push("M",h-Blockly.BlockSvg.SEP_SPACE_X-2.5+Blockly.BlockSvg.TAB_WIDTH-n.renderWidth+","+(k+Blockly.BlockSvg.INLINE_PADDING_Y+.5)),d.push(Blockly.BlockSvg.TAB_PATH_DOWN_HIGHLIGHT_RTL),d.push("v",n.renderHeight-Blockly.BlockSvg.TAB_HEIGHT+2.5),d.push("h",n.renderWidth-Blockly.BlockSvg.TAB_WIDTH+2)):(d.push("M",h-Blockly.BlockSvg.SEP_SPACE_X+.5+","+(k+Blockly.BlockSvg.INLINE_PADDING_Y+.5)),d.push("v",n.renderHeight+1),d.push("h",Blockly.BlockSvg.TAB_WIDTH-
diff --git a/core/block_svg.js b/core/block_svg.js
index 50c6bd0b6..059b1c0f3 100644
--- a/core/block_svg.js
+++ b/core/block_svg.js
@@ -851,6 +851,28 @@ Blockly.BlockSvg.NOTCH_WIDTH = 30;
  * @const
  */
 Blockly.BlockSvg.CORNER_RADIUS = 8;
+/**
+ * Do blocks with no previous or output connections have a 'hat' on top?
+ * @const
+ */
+Blockly.BlockSvg.START_HAT = false;
+/**
+ * Path of the top hat's curve.
+ * @const
+ */
+Blockly.BlockSvg.START_HAT_PATH = 'c 30,-15 70,-15 100,0';
+/**
+ * Path of the top hat's curve's highlight in LTR.
+ * @const
+ */
+Blockly.BlockSvg.START_HAT_HIGHLIGHT_LTR =
+    'c 17.8,-9.2 45.3,-14.9 75,-8.7 M 100.5,0.5';
+/**
+ * Path of the top hat's curve's highlight in RTL.
+ * @const
+ */
+Blockly.BlockSvg.START_HAT_HIGHLIGHT_RTL =
+    'm 25,-8.7 c 29.7,-6.2 57.2,-0.5 75,8.7';
 /**
  * Distance from shape edge to intersect with a curved corner at 45 degrees.
  * Applies to highlighting on around the inside of a curve.
@@ -1704,6 +1726,7 @@ Blockly.BlockSvg.prototype.renderCompute_ = function(iconWidth) {
  * @private
  */
 Blockly.BlockSvg.prototype.renderDraw_ = function(iconWidth, inputRows) {
+  this.startHat_ = false;
   // Should the top and bottom left corners be rounded or square?
   if (this.outputConnection) {
     this.squareTopLeftCorner_ = true;
@@ -1717,6 +1740,11 @@ Blockly.BlockSvg.prototype.renderDraw_ = function(iconWidth, inputRows) {
       if (prevBlock && prevBlock.getNextBlock() == this) {
         this.squareTopLeftCorner_ = true;
        }
+    } else if (Blockly.BlockSvg.START_HAT) {
+      // No output or previous connection.
+      this.squareTopLeftCorner_ = true;
+      this.startHat_ = true;
+      inputRows.rightEdge = Math.max(inputRows.rightEdge, 100);
     }
     var nextBlock = this.getNextBlock();
     if (nextBlock) {
@@ -1771,6 +1799,12 @@ Blockly.BlockSvg.prototype.renderDrawTop_ =
   if (this.squareTopLeftCorner_) {
     steps.push('m 0,0');
     highlightSteps.push('m 0.5,0.5');
+    if (this.startHat_) {
+      steps.push(Blockly.BlockSvg.START_HAT_PATH);
+      highlightSteps.push(this.RTL ?
+          Blockly.BlockSvg.START_HAT_HIGHLIGHT_RTL :
+          Blockly.BlockSvg.START_HAT_HIGHLIGHT_LTR);
+    }
   } else {
     steps.push(Blockly.BlockSvg.TOP_LEFT_CORNER_START);
     highlightSteps.push(this.RTL ?