// FIXME emphasis label position is not same with normal label position
define(function (require) {
'use strict';
var textContain = require('zrender/contain/text');
function adjustSingleSide(list, cx, cy, r, dir, viewWidth, viewHeight) {
list.sort(function (a, b) {
return a.y - b.y;
});
// ?
function shiftDown(start, end, delta, dir) {
for (var j = start; j < end; j++) {
list[j].y += delta;
if (j > start
&& j + 1 < end
&& list[j + 1].y > list[j].y + list[j].height
) {
shiftUp(j, delta / 2);
return;
}
}
shiftUp(end - 1, delta / 2);
}
// ?
function shiftUp(end, delta) {
for (var j = end; j >= 0; j--) {
list[j].y -= delta;
if (j > 0
&& list[j].y > list[j - 1].y + list[j - 1].height
) {
break;
}
}
}
function changeX(list, isDownList, cx, cy, r, dir) {
var lastDeltaX = dir > 0
? isDownList // ??
? Number.MAX_VALUE // ?
: 0 // ?
: isDownList // ??
? Number.MAX_VALUE // ?
: 0; // ?
for (var i = 0, l = list.length; i < l; i++) {
// Not change x for center label
if (list[i].position === 'center') {
continue;
}
var deltaY = Math.abs(list[i].y - cy);
var length = list[i].len;
var length2 = list[i].len2;
var deltaX = (deltaY < r + length)
? Math.sqrt(
(r + length + length2) * (r + length + length2)
- deltaY * deltaY
)
: Math.abs(list[i].x - cx);
if (isDownList && deltaX >= lastDeltaX) {
// ?????
deltaX = lastDeltaX - 10;
}
if (!isDownList && deltaX <= lastDeltaX) {
// ?????
deltaX = lastDeltaX + 10;
}
list[i].x = cx + deltaX * dir;
lastDeltaX = deltaX;
}
}
var lastY = 0;
var delta;
var len = list.length;
var upList = [];
var downList = [];
for (var i = 0; i < len; i++) {
delta = list[i].y - lastY;
if (delta < 0) {
shiftDown(i, len, -delta, dir);
}
lastY = list[i].y + list[i].height;
}
if (viewHeight - lastY < 0) {
shiftUp(len - 1, lastY - viewHeight);
}
for (var i = 0; i < len; i++) {
if (list[i].y >= cy) {
downList.push(list[i]);
}
else {
upList.push(list[i]);
}
}
changeX(upList, false, cx, cy, r, dir);
changeX(downList, true, cx, cy, r, dir);
}
function avoidOverlap(labelLayoutList, cx, cy, r, viewWidth, viewHeight) {
var leftList = [];
var rightList = [];
for (var i = 0; i < labelLayoutList.length; i++) {
if (labelLayoutList[i].x < cx) {
leftList.push(labelLayoutList[i]);
}
else {
rightList.push(labelLayoutList[i]);
}
}
adjustSingleSide(rightList, cx, cy, r, 1, viewWidth, viewHeight);
adjustSingleSide(leftList, cx, cy, r, -1, viewWidth, viewHeight);
for (var i = 0; i < labelLayoutList.length; i++) {
var linePoints = labelLayoutList[i].linePoints;
if (linePoints) {
var dist = linePoints[1][0] - linePoints[2][0];
if (labelLayoutList[i].x < cx) {
linePoints[2][0] = labelLayoutList[i].x + 3;
}
else {
linePoints[2][0] = labelLayoutList[i].x - 3;
}
linePoints[1][1] = linePoints[2][1] = labelLayoutList[i].y;
linePoints[1][0] = linePoints[2][0] + dist;
}
}
}
return function (seriesModel, r, viewWidth, viewHeight) {
var data = seriesModel.getData();
var labelLayoutList = [];
var cx;
var cy;
var hasLabelRotate = false;
data.each(function (idx) {
var layout = data.getItemLayout(idx);
var itemModel = data.getItemModel(idx);
var labelModel = itemModel.getModel('label.normal');
// Use position in normal or emphasis
var labelPosition = labelModel.get('position') || itemModel.get('label.emphasis.position');
var labelLineModel = itemModel.getModel('labelLine.normal');
var labelLineLen = labelLineModel.get('length');
var labelLineLen2 = labelLineModel.get('length2');
var midAngle = (layout.startAngle + layout.endAngle) / 2;
var dx = Math.cos(midAngle);
var dy = Math.sin(midAngle);
var textX;
var textY;
var linePoints;
var textAlign;
cx = layout.cx;
cy = layout.cy;
var isLabelInside = labelPosition === 'inside' || labelPosition === 'inner';
if (labelPosition === 'center') {
textX = layout.cx;
textY = layout.cy;
textAlign = 'center';
}
else {
var x1 = (isLabelInside ? (layout.r + layout.r0) / 2 * dx : layout.r * dx) + cx;
var y1 = (isLabelInside ? (layout.r + layout.r0) / 2 * dy : layout.r * dy) + cy;
textX = x1 + dx * 3;
textY = y1 + dy * 3;
if (!isLabelInside) {
// For roseType
var x2 = x1 + dx * (labelLineLen + r - layout.r);
var y2 = y1 + dy * (labelLineLen + r - layout.r);
var x3 = x2 + ((dx < 0 ? -1 : 1) * labelLineLen2);
var y3 = y2;
textX = x3 + (dx < 0 ? -5 : 5);
textY = y3;
linePoints = [[x1, y1], [x2, y2], [x3, y3]];
}
textAlign = isLabelInside ? 'center' : (dx > 0 ? 'left' : 'right');
}
var font = labelModel.getModel('textStyle').getFont();
var labelRotate = labelModel.get('rotate')
? (dx < 0 ? -midAngle + Math.PI : -midAngle) : 0;
var text = seriesModel.getFormattedLabel(idx, 'normal')
|| data.getName(idx);
var textRect = textContain.getBoundingRect(
text, font, textAlign, 'top'
);
hasLabelRotate = !!labelRotate;
layout.label = {
x: textX,
y: textY,
position: labelPosition,
height: textRect.height,
len: labelLineLen,
len2: labelLineLen2,
linePoints: linePoints,
textAlign: textAlign,
verticalAlign: 'middle',
font: font,
rotation: labelRotate
};
// Not layout the inside label
if (!isLabelInside) {
labelLayoutList.push(layout.label);
}
});
if (!hasLabelRotate && seriesModel.get('avoidLabelOverlap')) {
avoidOverlap(labelLayoutList, cx, cy, r, viewWidth, viewHeight);
}
};
});
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