Add bar text constraint configuration

Author: rreusser

src/traces/bar/attributes.js

@@ -80,6 +80,16 @@ module.exports = {
         description: 'Sets the font used for `text` lying outside the bar.'
     }),
 
+    constraintext: {
+        valType: 'enumerated',
+        values: ['inside', 'outside', 'both', 'none'],
+        role: 'info',
+        dflt: 'both',
+        description: [
+            'Constrain the size of text the bar to be no larger than the bar itself.'
+        ].join(' ')
+    },
+
     orientation: {
         valType: 'enumerated',
         role: 'info',

src/traces/bar/defaults.js

@@ -48,6 +48,7 @@ module.exports = function supplyDefaults(traceIn, traceOut, defaultColor, layout
         var textFont = coerceFont(coerce, 'textfont', layout.font);
         if(hasInside) coerceFont(coerce, 'insidetextfont', textFont);
         if(hasOutside) coerceFont(coerce, 'outsidetextfont', textFont);
+        coerce('constraintext');
     }
 
     handleStyleDefaults(traceIn, traceOut, coerce, defaultColor, layout);

src/traces/bar/plot.js

@@ -237,20 +237,22 @@ function appendBarText(gd, bar, calcTrace, i, x0, x1, y0, y1) {
     }
 
     // compute text transform
-    var transform;
+    var transform, constrained;
     if(textPosition === 'outside') {
+        constrained = trace.constraintext === 'both' || trace.constraintext === 'outside';
         transform = getTransformToMoveOutsideBar(x0, x1, y0, y1, textBB,
-            orientation);
+            orientation, constrained);
     }
     else {
+        constrained = trace.constraintext === 'both' || trace.constraintext === 'inside';
         transform = getTransformToMoveInsideBar(x0, x1, y0, y1, textBB,
-            orientation);
+            orientation, constrained);
     }
 
     textSelection.attr('transform', transform);
 }
 
-function getTransformToMoveInsideBar(x0, x1, y0, y1, textBB, orientation) {
+function getTransformToMoveInsideBar(x0, x1, y0, y1, textBB, orientation, constrained) {
     // compute text and target positions
     var textWidth = textBB.width,
         textHeight = textBB.height,
@@ -289,12 +291,12 @@ function getTransformToMoveInsideBar(x0, x1, y0, y1, textBB, orientation) {
     else if((textWidth < textHeight) === (barWidth < barHeight)) {
         // only scale is required
         rotate = false;
-        scale = Math.min(barWidth / textWidth, barHeight / textHeight);
+        scale = constrained ? Math.min(barWidth / textWidth, barHeight / textHeight) : 1;
     }
     else {
         // both scale and rotation are required
         rotate = true;
-        scale = Math.min(barHeight / textWidth, barWidth / textHeight);
+        scale = constrained ? Math.min(barHeight / textWidth, barWidth / textHeight) : 1;
     }
 
     if(rotate) rotate = 90;  // rotate clockwise
@@ -335,23 +337,26 @@ function getTransformToMoveInsideBar(x0, x1, y0, y1, textBB, orientation) {
     return getTransform(textX, textY, targetX, targetY, scale, rotate);
 }
 
-function getTransformToMoveOutsideBar(x0, x1, y0, y1, textBB, orientation) {
+function getTransformToMoveOutsideBar(x0, x1, y0, y1, textBB, orientation, constrained) {
     var barWidth = (orientation === 'h') ?
             Math.abs(y1 - y0) :
             Math.abs(x1 - x0),
         textpad;
 
-    // apply text padding if possible
+    // Keep the padding so the text doesn't sit right against
+    // the bars, but don't factor it into barWidth
     if(barWidth > 2 * TEXTPAD) {
         textpad = TEXTPAD;
-        barWidth -= 2 * textpad;
     }
 
     // compute rotation and scale
-    var rotate = false,
+    var rotate = false;
+    var scale = 1;
+    if(constrained) {
         scale = (orientation === 'h') ?
             Math.min(1, barWidth / textBB.height) :
             Math.min(1, barWidth / textBB.width);
+    }
 
     // compute text and target positions
     var textX = (textBB.left + textBB.right) / 2,

test/jasmine/tests/bar_test.js

@@ -95,6 +95,7 @@ describe('Bar.supplyDefaults', function() {
         expect(traceOut.texfont).toBeUndefined();
         expect(traceOut.insidetexfont).toBeUndefined();
         expect(traceOut.outsidetexfont).toBeUndefined();
+        expect(traceOut.constraintext).toBeUndefined();
     });
 
     it('should default textfont to layout.font', function() {
@@ -116,6 +117,7 @@ describe('Bar.supplyDefaults', function() {
         expect(traceOut.insidetextfont).not.toBe(layout.font);
         expect(traceOut.insidetextfont).not.toBe(traceOut.textfont);
         expect(traceOut.outsidetexfont).toBeUndefined();
+        expect(traceOut.constraintext).toBeUndefined();
     });
 
     it('should inherit layout.calendar', function() {