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import * as util from '../../../util';
import * as math from '../../../math';
let CRp = {};
CRp.eleTextBiggerThanMin = function( ele, scale ){
if( !scale ){
let zoom = ele.cy().zoom();
let pxRatio = this.getPixelRatio();
let lvl = Math.ceil( math.log2( zoom * pxRatio ) ); // the effective texture level
scale = Math.pow( 2, lvl );
}
let computedSize = ele.pstyle( 'font-size' ).pfValue * scale;
let minSize = ele.pstyle( 'min-zoomed-font-size' ).pfValue;
if( computedSize < minSize ){
return false;
}
return true;
};
CRp.drawElementText = function( context, ele, shiftToOriginWithBb, force, prefix, useEleOpacity = true ){
let r = this;
if( force == null ){
if( useEleOpacity && !r.eleTextBiggerThanMin( ele ) ){ return; }
} else if( force === false ){
return;
}
if( ele.isNode() ){
let label = ele.pstyle( 'label' );
if( !label || !label.value ){ return; }
let justification = r.getLabelJustification(ele);
context.textAlign = justification;
context.textBaseline = 'bottom';
} else {
let badLine = ele.element()._private.rscratch.badLine;
let label = ele.pstyle( 'label' );
let srcLabel = ele.pstyle( 'source-label' );
let tgtLabel = ele.pstyle( 'target-label' );
if(
badLine || (
( !label || !label.value )
&& ( !srcLabel || !srcLabel.value )
&& ( !tgtLabel || !tgtLabel.value )
)
){
return;
}
context.textAlign = 'center';
context.textBaseline = 'bottom';
}
let applyRotation = !shiftToOriginWithBb;
let bb;
if( shiftToOriginWithBb ){
bb = shiftToOriginWithBb;
context.translate( -bb.x1, -bb.y1 );
}
if( prefix == null ){
r.drawText( context, ele, null, applyRotation, useEleOpacity );
if( ele.isEdge() ){
r.drawText( context, ele, 'source', applyRotation, useEleOpacity );
r.drawText( context, ele, 'target', applyRotation, useEleOpacity );
}
} else {
r.drawText( context, ele, prefix, applyRotation, useEleOpacity );
}
if( shiftToOriginWithBb ){
context.translate( bb.x1, bb.y1 );
}
};
CRp.getFontCache = function( context ){
let cache;
this.fontCaches = this.fontCaches || [];
for( let i = 0; i < this.fontCaches.length; i++ ){
cache = this.fontCaches[ i ];
if( cache.context === context ){
return cache;
}
}
cache = {
context: context
};
this.fontCaches.push( cache );
return cache;
};
// set up canvas context with font
// returns transformed text string
CRp.setupTextStyle = function( context, ele, useEleOpacity = true ){
// Font style
let labelStyle = ele.pstyle( 'font-style' ).strValue;
let labelSize = ele.pstyle( 'font-size' ).pfValue + 'px';
let labelFamily = ele.pstyle( 'font-family' ).strValue;
let labelWeight = ele.pstyle( 'font-weight' ).strValue;
let opacity = (useEleOpacity ? ele.effectiveOpacity() * ele.pstyle('text-opacity').value : 1);
let outlineOpacity = ele.pstyle( 'text-outline-opacity' ).value * opacity;
let color = ele.pstyle( 'color' ).value;
let outlineColor = ele.pstyle( 'text-outline-color' ).value;
context.font = labelStyle + ' ' + labelWeight + ' ' + labelSize + ' ' + labelFamily;
context.lineJoin = 'round'; // so text outlines aren't jagged
this.colorFillStyle( context, color[ 0 ], color[ 1 ], color[ 2 ], opacity );
this.colorStrokeStyle( context, outlineColor[ 0 ], outlineColor[ 1 ], outlineColor[ 2 ], outlineOpacity );
};
// TODO ensure re-used
function roundRect( ctx, x, y, width, height, radius = 5, stroke){
ctx.beginPath();
ctx.moveTo( x + radius, y );
ctx.lineTo( x + width - radius, y );
ctx.quadraticCurveTo( x + width, y, x + width, y + radius );
ctx.lineTo( x + width, y + height - radius );
ctx.quadraticCurveTo( x + width, y + height, x + width - radius, y + height );
ctx.lineTo( x + radius, y + height );
ctx.quadraticCurveTo( x, y + height, x, y + height - radius );
ctx.lineTo( x, y + radius );
ctx.quadraticCurveTo( x, y, x + radius, y );
ctx.closePath();
if(stroke)
ctx.stroke();
else
ctx.fill();
}
CRp.getTextAngle = function( ele, prefix ){
let theta;
let _p = ele._private;
let rscratch = _p.rscratch;
let pdash = prefix ? prefix + '-' : '';
let rotation = ele.pstyle( pdash + 'text-rotation' );
let textAngle = util.getPrefixedProperty( rscratch, 'labelAngle', prefix );
if( rotation.strValue === 'autorotate' ){
theta = ele.isEdge() ? textAngle : 0;
} else if( rotation.strValue === 'none' ){
theta = 0;
} else {
theta = rotation.pfValue;
}
return theta;
};
CRp.drawText = function( context, ele, prefix, applyRotation = true, useEleOpacity = true ){
let _p = ele._private;
let rscratch = _p.rscratch;
let parentOpacity = useEleOpacity ? ele.effectiveOpacity() : 1;
if( useEleOpacity && (parentOpacity === 0 || ele.pstyle( 'text-opacity' ).value === 0) ){
return;
}
// use 'main' as an alias for the main label (i.e. null prefix)
if( prefix === 'main' ){ prefix = null; }
let textX = util.getPrefixedProperty( rscratch, 'labelX', prefix );
let textY = util.getPrefixedProperty( rscratch, 'labelY', prefix );
let orgTextX, orgTextY; // used for rotation
let text = this.getLabelText( ele, prefix );
if( text != null && text !== '' && !isNaN( textX ) && !isNaN( textY ) ){
this.setupTextStyle( context, ele, useEleOpacity );
let pdash = prefix ? prefix + '-' : '';
let textW = util.getPrefixedProperty( rscratch, 'labelWidth', prefix );
let textH = util.getPrefixedProperty( rscratch, 'labelHeight', prefix );
let marginX = ele.pstyle( pdash + 'text-margin-x' ).pfValue;
let marginY = ele.pstyle( pdash + 'text-margin-y' ).pfValue;
let isEdge = ele.isEdge();
let halign = ele.pstyle( 'text-halign' ).value;
let valign = ele.pstyle( 'text-valign' ).value;
if( isEdge ){
halign = 'center';
valign = 'center';
}
textX += marginX;
textY += marginY;
let theta;
if( !applyRotation ){
theta = 0;
} else {
theta = this.getTextAngle(ele, prefix);
}
if( theta !== 0 ){
orgTextX = textX;
orgTextY = textY;
context.translate( orgTextX, orgTextY );
context.rotate( theta );
textX = 0;
textY = 0;
}
switch( valign ){
case 'top':
break;
case 'center':
textY += textH / 2;
break;
case 'bottom':
textY += textH;
break;
}
let backgroundOpacity = ele.pstyle( 'text-background-opacity' ).value;
let borderOpacity = ele.pstyle( 'text-border-opacity' ).value;
let textBorderWidth = ele.pstyle( 'text-border-width' ).pfValue;
let backgroundPadding = ele.pstyle( 'text-background-padding' ).pfValue;
let styleShape = ele.pstyle( 'text-background-shape' ).strValue;
let rounded = styleShape.indexOf('round') === 0;
let roundRadius = 2;
if( backgroundOpacity > 0 || ( textBorderWidth > 0 && borderOpacity > 0 ) ){
let bgX = textX - backgroundPadding;
switch( halign ){
case 'left':
bgX -= textW;
break;
case 'center':
bgX -= textW / 2;
break;
case 'right':
break;
}
let bgY = textY - textH - backgroundPadding;
let bgW = textW + 2*backgroundPadding;
let bgH = textH + 2*backgroundPadding;
if( backgroundOpacity > 0 ){
let textFill = context.fillStyle;
let textBackgroundColor = ele.pstyle( 'text-background-color' ).value;
context.fillStyle = 'rgba(' + textBackgroundColor[ 0 ] + ',' + textBackgroundColor[ 1 ] + ',' + textBackgroundColor[ 2 ] + ',' + backgroundOpacity * parentOpacity + ')';
if( rounded ){
roundRect( context, bgX, bgY, bgW, bgH, roundRadius );
} else {
context.fillRect( bgX, bgY, bgW, bgH );
}
context.fillStyle = textFill;
}
if( textBorderWidth > 0 && borderOpacity > 0 ){
let textStroke = context.strokeStyle;
let textLineWidth = context.lineWidth;
let textBorderColor = ele.pstyle( 'text-border-color' ).value;
let textBorderStyle = ele.pstyle( 'text-border-style' ).value;
context.strokeStyle = 'rgba(' + textBorderColor[ 0 ] + ',' + textBorderColor[ 1 ] + ',' + textBorderColor[ 2 ] + ',' + borderOpacity * parentOpacity + ')';
context.lineWidth = textBorderWidth;
if( context.setLineDash ){ // for very outofdate browsers
switch( textBorderStyle ){
case 'dotted':
context.setLineDash( [ 1, 1 ] );
break;
case 'dashed':
context.setLineDash( [ 4, 2 ] );
break;
case 'double':
context.lineWidth = textBorderWidth / 4; // 50% reserved for white between the two borders
context.setLineDash( [] );
break;
case 'solid':
context.setLineDash( [] );
break;
}
}
if( rounded ){
roundRect( context, bgX, bgY, bgW, bgH, roundRadius, 'stroke' );
} else {
context.strokeRect( bgX, bgY, bgW, bgH );
}
if( textBorderStyle === 'double' ){
let whiteWidth = textBorderWidth / 2;
if( rounded ){
roundRect( context, bgX + whiteWidth, bgY + whiteWidth, bgW - whiteWidth * 2, bgH - whiteWidth * 2, roundRadius, 'stroke' );
} else {
context.strokeRect( bgX + whiteWidth, bgY + whiteWidth, bgW - whiteWidth * 2, bgH - whiteWidth * 2 );
}
}
if( context.setLineDash ){ // for very outofdate browsers
context.setLineDash( [] );
}
context.lineWidth = textLineWidth;
context.strokeStyle = textStroke;
}
}
let lineWidth = 2 * ele.pstyle( 'text-outline-width' ).pfValue; // *2 b/c the stroke is drawn centred on the middle
if( lineWidth > 0 ){
context.lineWidth = lineWidth;
}
if( ele.pstyle( 'text-wrap' ).value === 'wrap' ){
let lines = util.getPrefixedProperty( rscratch, 'labelWrapCachedLines', prefix );
let lineHeight = util.getPrefixedProperty( rscratch, 'labelLineHeight', prefix );
let halfTextW = textW/2;
let justification = this.getLabelJustification(ele);
if( justification === 'auto' ){
// then it's already ok, so skip all the other ifs
} else if( halign === 'left' ){ // auto justification : right
if( justification === 'left' ){
textX += -textW;
} else if( justification === 'center' ){
textX += -halfTextW;
} // else same as auto
} else if( halign === 'center' ){ // auto justfication : center
if( justification === 'left' ){
textX += -halfTextW;
} else if( justification === 'right' ){
textX += halfTextW;
} // else same as auto
} else if( halign === 'right' ){ // auto justification : left
if( justification === 'center' ){
textX += halfTextW;
} else if( justification === 'right' ){
textX += textW;
} // else same as auto
}
switch( valign ){
case 'top':
textY -= ( lines.length - 1 ) * lineHeight;
break;
case 'center':
case 'bottom':
textY -= ( lines.length - 1 ) * lineHeight;
break;
}
for( let l = 0; l < lines.length; l++ ){
if( lineWidth > 0 ){
context.strokeText( lines[ l ], textX, textY );
}
context.fillText( lines[ l ], textX, textY );
textY += lineHeight;
}
} else {
if( lineWidth > 0 ){
context.strokeText( text, textX, textY );
}
context.fillText( text, textX, textY );
}
if( theta !== 0 ){
context.rotate( -theta );
context.translate( -orgTextX, -orgTextY );
}
}
};
export default CRp;
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