Back to project page GraphView.
The source code is released under:
GNU General Public License
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package com.jjoe64.graphview.helper; /*from www .j a va2 s . c o m*/ import com.jjoe64.graphview.DefaultLabelFormatter; import com.jjoe64.graphview.GraphView; import com.jjoe64.graphview.LabelFormatter; import com.jjoe64.graphview.Viewport; /** * Use this label formatter to show static labels. * Static labels are not bound to the data. It is typical used * for show text like "low", "middle", "high". * * You can set the static labels for vertical or horizontal * individually and you can define a label formatter that * is to be used if you don't define static labels. * * For example if you only use static labels for horizontal labels, * graphview will use the dynamicLabelFormatter for the vertical labels. */ public class StaticLabelsFormatter implements LabelFormatter { /** * reference to the viewport */ protected Viewport mViewport; /** * the vertical labels, ordered from bottom to the top * if it is null, the labels will be generated via the #dynamicLabelFormatter */ protected String[] mVerticalLabels; /** * the horizontal labels, ordered form the left to the right * if it is null, the labels will be generated via the #dynamicLabelFormatter */ protected String[] mHorizontalLabels; /** * the label formatter that will format the labels * for that there are no static labels defined. */ protected LabelFormatter mDynamicLabelFormatter; /** * reference to the graphview */ protected final GraphView mGraphView; /** * creates the formatter without any static labels * define your static labels via {@link #setHorizontalLabels(String[])} and {@link #setVerticalLabels(String[])} * * @param graphView reference to the graphview */ public StaticLabelsFormatter(GraphView graphView) { mGraphView = graphView; init(null, null, null); } /** * creates the formatter without any static labels. * define your static labels via {@link #setHorizontalLabels(String[])} and {@link #setVerticalLabels(String[])} * * @param graphView reference to the graphview * @param dynamicLabelFormatter the label formatter that will format the labels * for that there are no static labels defined. */ public StaticLabelsFormatter(GraphView graphView, LabelFormatter dynamicLabelFormatter) { mGraphView = graphView; init(null, null, dynamicLabelFormatter); } /** * creates the formatter with static labels defined. * * @param graphView reference to the graphview * @param horizontalLabels the horizontal labels, ordered form the left to the right * if it is null, the labels will be generated via the #dynamicLabelFormatter * @param verticalLabels the vertical labels, ordered from bottom to the top * if it is null, the labels will be generated via the #dynamicLabelFormatter */ public StaticLabelsFormatter(GraphView graphView, String[] horizontalLabels, String[] verticalLabels) { mGraphView = graphView; init(horizontalLabels, verticalLabels, null); } /** * creates the formatter with static labels defined. * * @param graphView reference to the graphview * @param horizontalLabels the horizontal labels, ordered form the left to the right * if it is null, the labels will be generated via the #dynamicLabelFormatter * @param verticalLabels the vertical labels, ordered from bottom to the top * if it is null, the labels will be generated via the #dynamicLabelFormatter * @param dynamicLabelFormatter the label formatter that will format the labels * for that there are no static labels defined. */ public StaticLabelsFormatter(GraphView graphView, String[] horizontalLabels, String[] verticalLabels, LabelFormatter dynamicLabelFormatter) { mGraphView = graphView; init(horizontalLabels, verticalLabels, dynamicLabelFormatter); } /** * @param horizontalLabels the horizontal labels, ordered form the left to the right * if it is null, the labels will be generated via the #dynamicLabelFormatter * @param verticalLabels the vertical labels, ordered from bottom to the top * if it is null, the labels will be generated via the #dynamicLabelFormatter * @param dynamicLabelFormatter the label formatter that will format the labels * for that there are no static labels defined. */ protected void init(String[] horizontalLabels, String[] verticalLabels, LabelFormatter dynamicLabelFormatter) { mDynamicLabelFormatter = dynamicLabelFormatter; if (mDynamicLabelFormatter == null) { mDynamicLabelFormatter = new DefaultLabelFormatter(); } mHorizontalLabels = horizontalLabels; mVerticalLabels = verticalLabels; } /** * Set a label formatter that will be used for the labels * that don't have static labels. * * For example if you only use static labels for horizontal labels, * graphview will use the dynamicLabelFormatter for the vertical labels. * * @param dynamicLabelFormatter the label formatter that will format the labels * for that there are no static labels defined. */ public void setDynamicLabelFormatter(LabelFormatter dynamicLabelFormatter) { this.mDynamicLabelFormatter = dynamicLabelFormatter; adjust(); } /** * @param horizontalLabels the horizontal labels, ordered form the left to the right * if it is null, the labels will be generated via the #dynamicLabelFormatter */ public void setHorizontalLabels(String[] horizontalLabels) { this.mHorizontalLabels = horizontalLabels; adjust(); } /** * @param verticalLabels the vertical labels, ordered from bottom to the top * if it is null, the labels will be generated via the #dynamicLabelFormatter */ public void setVerticalLabels(String[] verticalLabels) { this.mVerticalLabels = verticalLabels; adjust(); } /** * * @param value raw input number * @param isValueX true if it is a value for the x axis * false if it is a value for the y axis * @return */ @Override public String formatLabel(double value, boolean isValueX) { if (isValueX && mHorizontalLabels != null) { double minX = mViewport.getMinX(false); double maxX = mViewport.getMaxX(false); double range = maxX - minX; value = value-minX; int idx = (int)((value/range) * (mHorizontalLabels.length-1)); return mHorizontalLabels[idx]; } else if (!isValueX && mVerticalLabels != null) { double minY = mViewport.getMinY(false); double maxY = mViewport.getMaxY(false); double range = maxY - minY; value = value-minY; int idx = (int)((value/range) * (mVerticalLabels.length-1)); return mVerticalLabels[idx]; } else { return mDynamicLabelFormatter.formatLabel(value, isValueX); } } /** * @param viewport the used viewport */ @Override public void setViewport(Viewport viewport) { mViewport = viewport; adjust(); } /** * adjusts the number of vertical/horizontal labels */ protected void adjust() { mDynamicLabelFormatter.setViewport(mViewport); if (mVerticalLabels != null) { if (mVerticalLabels.length < 2) { throw new IllegalStateException("You need at least 2 vertical labels if you use static label formatter."); } mGraphView.getGridLabelRenderer().setNumVerticalLabels(mVerticalLabels.length); } if (mHorizontalLabels != null) { if (mHorizontalLabels.length < 2) { throw new IllegalStateException("You need at least 2 horizontal labels if you use static label formatter."); } mGraphView.getGridLabelRenderer().setNumHorizontalLabels(mHorizontalLabels.length); } } }