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Viewing file:     graphic.js (14.32 KB)      -rw-r--r--

var _core = require("./core");

var createElement = _core.createElement;

var PathProxy = require("../core/PathProxy");

var BoundingRect = require("../core/BoundingRect");

var matrix = require("../core/matrix");

var textContain = require("../contain/text");

var textHelper = require("../graphic/helper/text");

var Text = require("../graphic/Text");

// TODO
// 1. shadow
// 2. Image: sx, sy, sw, sh
var CMD = PathProxy.CMD;
var arrayJoin = Array.prototype.join;
var NONE = 'none';
var mathRound = Math.round;
var mathSin = Math.sin;
var mathCos = Math.cos;
var PI = Math.PI;
var PI2 = Math.PI * 2;
var degree = 180 / PI;
var EPSILON = 1e-4;

function round4(val) {
  return mathRound(val * 1e4) / 1e4;
}

function isAroundZero(val) {
  return val < EPSILON && val > -EPSILON;
}

function pathHasFill(style, isText) {
  var fill = isText ? style.textFill : style.fill;
  return fill != null && fill !== NONE;
}

function pathHasStroke(style, isText) {
  var stroke = isText ? style.textStroke : style.stroke;
  return stroke != null && stroke !== NONE;
}

function setTransform(svgEl, m) {
  if (m) {
    attr(svgEl, 'transform', 'matrix(' + arrayJoin.call(m, ',') + ')');
  }
}

function attr(el, key, val) {
  if (!val || val.type !== 'linear' && val.type !== 'radial') {
    // Don't set attribute for gradient, since it need new dom nodes
    el.setAttribute(key, val);
  }
}

function attrXLink(el, key, val) {
  el.setAttributeNS('http://www.w3.org/1999/xlink', key, val);
}

function bindStyle(svgEl, style, isText, el) {
  if (pathHasFill(style, isText)) {
    var fill = isText ? style.textFill : style.fill;
    fill = fill === 'transparent' ? NONE : fill;
    attr(svgEl, 'fill', fill);
    attr(svgEl, 'fill-opacity', style.fillOpacity != null ? style.fillOpacity * style.opacity : style.opacity);
  } else {
    attr(svgEl, 'fill', NONE);
  }

  if (pathHasStroke(style, isText)) {
    var stroke = isText ? style.textStroke : style.stroke;
    stroke = stroke === 'transparent' ? NONE : stroke;
    attr(svgEl, 'stroke', stroke);
    var strokeWidth = isText ? style.textStrokeWidth : style.lineWidth;
    var strokeScale = !isText && style.strokeNoScale ? el.getLineScale() : 1;
    attr(svgEl, 'stroke-width', strokeWidth / strokeScale); // stroke then fill for text; fill then stroke for others

    attr(svgEl, 'paint-order', isText ? 'stroke' : 'fill');
    attr(svgEl, 'stroke-opacity', style.strokeOpacity != null ? style.strokeOpacity : style.opacity);
    var lineDash = style.lineDash;

    if (lineDash) {
      attr(svgEl, 'stroke-dasharray', style.lineDash.join(','));
      attr(svgEl, 'stroke-dashoffset', mathRound(style.lineDashOffset || 0));
    } else {
      attr(svgEl, 'stroke-dasharray', '');
    } // PENDING


    style.lineCap && attr(svgEl, 'stroke-linecap', style.lineCap);
    style.lineJoin && attr(svgEl, 'stroke-linejoin', style.lineJoin);
    style.miterLimit && attr(svgEl, 'stroke-miterlimit', style.miterLimit);
  } else {
    attr(svgEl, 'stroke', NONE);
  }
}
/***************************************************
 * PATH
 **************************************************/


function pathDataToString(path) {
  var str = [];
  var data = path.data;
  var dataLength = path.len();

  for (var i = 0; i < dataLength;) {
    var cmd = data[i++];
    var cmdStr = '';
    var nData = 0;

    switch (cmd) {
      case CMD.M:
        cmdStr = 'M';
        nData = 2;
        break;

      case CMD.L:
        cmdStr = 'L';
        nData = 2;
        break;

      case CMD.Q:
        cmdStr = 'Q';
        nData = 4;
        break;

      case CMD.C:
        cmdStr = 'C';
        nData = 6;
        break;

      case CMD.A:
        var cx = data[i++];
        var cy = data[i++];
        var rx = data[i++];
        var ry = data[i++];
        var theta = data[i++];
        var dTheta = data[i++];
        var psi = data[i++];
        var clockwise = data[i++];
        var dThetaPositive = Math.abs(dTheta);
        var isCircle = isAroundZero(dThetaPositive - PI2) || (clockwise ? dTheta >= PI2 : -dTheta >= PI2); // Mapping to 0~2PI

        var unifiedTheta = dTheta > 0 ? dTheta % PI2 : dTheta % PI2 + PI2;
        var large = false;

        if (isCircle) {
          large = true;
        } else if (isAroundZero(dThetaPositive)) {
          large = false;
        } else {
          large = unifiedTheta >= PI === !!clockwise;
        }

        var x0 = round4(cx + rx * mathCos(theta));
        var y0 = round4(cy + ry * mathSin(theta)); // It will not draw if start point and end point are exactly the same
        // We need to shift the end point with a small value
        // FIXME A better way to draw circle ?

        if (isCircle) {
          if (clockwise) {
            dTheta = PI2 - 1e-4;
          } else {
            dTheta = -PI2 + 1e-4;
          }

          large = true;

          if (i === 9) {
            // Move to (x0, y0) only when CMD.A comes at the
            // first position of a shape.
            // For instance, when drawing a ring, CMD.A comes
            // after CMD.M, so it's unnecessary to move to
            // (x0, y0).
            str.push('M', x0, y0);
          }
        }

        var x = round4(cx + rx * mathCos(theta + dTheta));
        var y = round4(cy + ry * mathSin(theta + dTheta)); // FIXME Ellipse

        str.push('A', round4(rx), round4(ry), mathRound(psi * degree), +large, +clockwise, x, y);
        break;

      case CMD.Z:
        cmdStr = 'Z';
        break;

      case CMD.R:
        var x = round4(data[i++]);
        var y = round4(data[i++]);
        var w = round4(data[i++]);
        var h = round4(data[i++]);
        str.push('M', x, y, 'L', x + w, y, 'L', x + w, y + h, 'L', x, y + h, 'L', x, y);
        break;
    }

    cmdStr && str.push(cmdStr);

    for (var j = 0; j < nData; j++) {
      // PENDING With scale
      str.push(round4(data[i++]));
    }
  }

  return str.join(' ');
}

var svgPath = {};

svgPath.brush = function (el) {
  var style = el.style;
  var svgEl = el.__svgEl;

  if (!svgEl) {
    svgEl = createElement('path');
    el.__svgEl = svgEl;
  }

  if (!el.path) {
    el.createPathProxy();
  }

  var path = el.path;

  if (el.__dirtyPath) {
    path.beginPath();
    path.subPixelOptimize = false;
    el.buildPath(path, el.shape);
    el.__dirtyPath = false;
    var pathStr = pathDataToString(path);

    if (pathStr.indexOf('NaN') < 0) {
      // Ignore illegal path, which may happen such in out-of-range
      // data in Calendar series.
      attr(svgEl, 'd', pathStr);
    }
  }

  bindStyle(svgEl, style, false, el);
  setTransform(svgEl, el.transform);

  if (style.text != null) {
    svgTextDrawRectText(el, el.getBoundingRect());
  } else {
    removeOldTextNode(el);
  }
};
/***************************************************
 * IMAGE
 **************************************************/


var svgImage = {};

svgImage.brush = function (el) {
  var style = el.style;
  var image = style.image;

  if (image instanceof HTMLImageElement) {
    var src = image.src;
    image = src;
  }

  if (!image) {
    return;
  }

  var x = style.x || 0;
  var y = style.y || 0;
  var dw = style.width;
  var dh = style.height;
  var svgEl = el.__svgEl;

  if (!svgEl) {
    svgEl = createElement('image');
    el.__svgEl = svgEl;
  }

  if (image !== el.__imageSrc) {
    attrXLink(svgEl, 'href', image); // Caching image src

    el.__imageSrc = image;
  }

  attr(svgEl, 'width', dw);
  attr(svgEl, 'height', dh);
  attr(svgEl, 'x', x);
  attr(svgEl, 'y', y);
  setTransform(svgEl, el.transform);

  if (style.text != null) {
    svgTextDrawRectText(el, el.getBoundingRect());
  } else {
    removeOldTextNode(el);
  }
};
/***************************************************
 * TEXT
 **************************************************/


var svgText = {};

var _tmpTextHostRect = new BoundingRect();

var _tmpTextBoxPos = {};
var _tmpTextTransform = [];
var TEXT_ALIGN_TO_ANCHRO = {
  left: 'start',
  right: 'end',
  center: 'middle',
  middle: 'middle'
};
/**
 * @param {module:zrender/Element} el
 * @param {Object|boolean} [hostRect] {x, y, width, height}
 *        If set false, rect text is not used.
 */

var svgTextDrawRectText = function (el, hostRect) {
  var style = el.style;
  var elTransform = el.transform;
  var needTransformTextByHostEl = el instanceof Text || style.transformText;
  el.__dirty && textHelper.normalizeTextStyle(style, true);
  var text = style.text; // Convert to string

  text != null && (text += '');

  if (!textHelper.needDrawText(text, style)) {
    return;
  } // render empty text for svg if no text but need draw text.


  text == null && (text = ''); // Follow the setting in the canvas renderer, if not transform the
  // text, transform the hostRect, by which the text is located.

  if (!needTransformTextByHostEl && elTransform) {
    _tmpTextHostRect.copy(hostRect);

    _tmpTextHostRect.applyTransform(elTransform);

    hostRect = _tmpTextHostRect;
  }

  var textSvgEl = el.__textSvgEl;

  if (!textSvgEl) {
    textSvgEl = createElement('text');
    el.__textSvgEl = textSvgEl;
  } // style.font has been normalized by `normalizeTextStyle`.


  var textSvgElStyle = textSvgEl.style;
  var font = style.font || textContain.DEFAULT_FONT;
  var computedFont = textSvgEl.__computedFont;

  if (font !== textSvgEl.__styleFont) {
    textSvgElStyle.font = textSvgEl.__styleFont = font; // The computedFont might not be the orginal font if it is illegal font.

    computedFont = textSvgEl.__computedFont = textSvgElStyle.font;
  }

  var textPadding = style.textPadding;
  var textLineHeight = style.textLineHeight;
  var contentBlock = el.__textCotentBlock;

  if (!contentBlock || el.__dirtyText) {
    contentBlock = el.__textCotentBlock = textContain.parsePlainText(text, computedFont, textPadding, textLineHeight, style.truncate);
  }

  var outerHeight = contentBlock.outerHeight;
  var lineHeight = contentBlock.lineHeight;
  textHelper.getBoxPosition(_tmpTextBoxPos, el, style, hostRect);
  var baseX = _tmpTextBoxPos.baseX;
  var baseY = _tmpTextBoxPos.baseY;
  var textAlign = _tmpTextBoxPos.textAlign || 'left';
  var textVerticalAlign = _tmpTextBoxPos.textVerticalAlign;
  setTextTransform(textSvgEl, needTransformTextByHostEl, elTransform, style, hostRect, baseX, baseY);
  var boxY = textContain.adjustTextY(baseY, outerHeight, textVerticalAlign);
  var textX = baseX;
  var textY = boxY; // TODO needDrawBg

  if (textPadding) {
    textX = getTextXForPadding(baseX, textAlign, textPadding);
    textY += textPadding[0];
  } // `textBaseline` is set as 'middle'.


  textY += lineHeight / 2;
  bindStyle(textSvgEl, style, true, el); // FIXME
  // Add a <style> to reset all of the text font as inherit?
  // otherwise the outer <style> may set the unexpected style.
  // Font may affect position of each tspan elements

  var canCacheByTextString = contentBlock.canCacheByTextString;
  var tspanList = el.__tspanList || (el.__tspanList = []);
  var tspanOriginLen = tspanList.length; // Optimize for most cases, just compare text string to determine change.

  if (canCacheByTextString && el.__canCacheByTextString && el.__text === text) {
    if (el.__dirtyText && tspanOriginLen) {
      for (var idx = 0; idx < tspanOriginLen; ++idx) {
        updateTextLocation(tspanList[idx], textAlign, textX, textY + idx * lineHeight);
      }
    }
  } else {
    el.__text = text;
    el.__canCacheByTextString = canCacheByTextString;
    var textLines = contentBlock.lines;
    var nTextLines = textLines.length;
    var idx = 0;

    for (; idx < nTextLines; idx++) {
      // Using cached tspan elements
      var tspan = tspanList[idx];
      var singleLineText = textLines[idx];

      if (!tspan) {
        tspan = tspanList[idx] = createElement('tspan');
        textSvgEl.appendChild(tspan);
        tspan.appendChild(document.createTextNode(singleLineText));
      } else if (tspan.__zrText !== singleLineText) {
        tspan.innerHTML = '';
        tspan.appendChild(document.createTextNode(singleLineText));
      }

      updateTextLocation(tspan, textAlign, textX, textY + idx * lineHeight);
    } // Remove unused tspan elements


    if (tspanOriginLen > nTextLines) {
      for (; idx < tspanOriginLen; idx++) {
        textSvgEl.removeChild(tspanList[idx]);
      }

      tspanList.length = nTextLines;
    }
  }
};

function setTextTransform(textSvgEl, needTransformTextByHostEl, elTransform, style, hostRect, baseX, baseY) {
  matrix.identity(_tmpTextTransform);

  if (needTransformTextByHostEl && elTransform) {
    matrix.copy(_tmpTextTransform, elTransform);
  } // textRotation only apply in RectText.


  var textRotation = style.textRotation;

  if (hostRect && textRotation) {
    var origin = style.textOrigin;

    if (origin === 'center') {
      baseX = hostRect.width / 2 + hostRect.x;
      baseY = hostRect.height / 2 + hostRect.y;
    } else if (origin) {
      baseX = origin[0] + hostRect.x;
      baseY = origin[1] + hostRect.y;
    }

    _tmpTextTransform[4] -= baseX;
    _tmpTextTransform[5] -= baseY; // Positive: anticlockwise

    matrix.rotate(_tmpTextTransform, _tmpTextTransform, textRotation);
    _tmpTextTransform[4] += baseX;
    _tmpTextTransform[5] += baseY;
  } // See the definition in `Style.js#textOrigin`, the default
  // origin is from the result of `getBoxPosition`.


  setTransform(textSvgEl, _tmpTextTransform);
} // FIXME merge the same code with `helper/text.js#getTextXForPadding`;


function getTextXForPadding(x, textAlign, textPadding) {
  return textAlign === 'right' ? x - textPadding[1] : textAlign === 'center' ? x + textPadding[3] / 2 - textPadding[1] / 2 : x + textPadding[3];
}

function updateTextLocation(tspan, textAlign, x, y) {
  // Consider different font display differently in vertial align, we always
  // set vertialAlign as 'middle', and use 'y' to locate text vertically.
  attr(tspan, 'dominant-baseline', 'middle');
  attr(tspan, 'text-anchor', TEXT_ALIGN_TO_ANCHRO[textAlign]);
  attr(tspan, 'x', x);
  attr(tspan, 'y', y);
}

function removeOldTextNode(el) {
  if (el && el.__textSvgEl) {
    // textSvgEl may has no parentNode if el has been removed temporary.
    if (el.__textSvgEl.parentNode) {
      el.__textSvgEl.parentNode.removeChild(el.__textSvgEl);
    }

    el.__textSvgEl = null;
    el.__tspanList = [];
    el.__text = null;
  }
}

svgText.drawRectText = svgTextDrawRectText;

svgText.brush = function (el) {
  var style = el.style;

  if (style.text != null) {
    svgTextDrawRectText(el, false);
  } else {
    removeOldTextNode(el);
  }
};

exports.path = svgPath;
exports.image = svgImage;
exports.text = svgText;