/**
* Copyright (C) 2009, 2010 SC 4ViewSoft SRL
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.achartengine.tools;
import java.util.ArrayList;
import java.util.List;
import org.achartengine.chart.AbstractChart;
import org.achartengine.chart.RoundChart;
import org.achartengine.chart.XYChart;
/**
* The pan tool.
*/
public class Pan extends AbstractTool {
/** The pan listeners. */
private List<PanListener> mPanListeners = new ArrayList<PanListener>();
/**
* Builds and instance of the pan tool.
*
* @param chart the XY chart
*/
public Pan(AbstractChart chart) {
super(chart);
}
/**
* Apply the tool.
*
* @param oldX the previous location on X axis
* @param oldY the previous location on Y axis
* @param newX the current location on X axis
* @param newY the current location on the Y axis
*/
public void apply(float oldX, float oldY, float newX, float newY) {
if (mChart instanceof XYChart) {
int scales = mRenderer.getScalesCount();
double[] limits = mRenderer.getPanLimits();
boolean limited = limits != null && limits.length == 4;
XYChart chart = (XYChart) mChart;
for (int i = 0; i < scales; i++) {
double[] range = getRange(i);
double[] calcRange = chart.getCalcRange(i);
if (range[0] == range[1] && calcRange[0] == calcRange[1] || range[2] == range[3]
&& calcRange[2] == calcRange[3]) {
return;
}
checkRange(range, i);
double[] realPoint = chart.toRealPoint(oldX, oldY, i);
double[] realPoint2 = chart.toRealPoint(newX, newY, i);
double deltaX = realPoint[0] - realPoint2[0];
double deltaY = realPoint[1] - realPoint2[1];
if (mRenderer.isPanXEnabled()) {
if (limited) {
boolean notLimitedLeft = limits[0] <= range[0] + deltaX;
boolean notLimitedRight = limits[1] >= range[1] + deltaX;
if (notLimitedLeft && notLimitedRight) {
setXRange(range[0] + deltaX, range[1] + deltaX, i);
}
} else {
setXRange(range[0] + deltaX, range[1] + deltaX, i);
}
}
if (mRenderer.isPanYEnabled()) {
if (limited) {
boolean notLimitedBottom = limits[2] <= range[2] + deltaY;
boolean notLimitedUp = limits[3] < range[3] + deltaY;
if (notLimitedBottom && !notLimitedUp) {
setYRange(range[2] + deltaY, range[3] + deltaY, i);
}
} else {
setYRange(range[2] + deltaY, range[3] + deltaY, i);
}
}
}
} else {
RoundChart chart = (RoundChart) mChart;
chart.setCenterX(chart.getCenterX() + (int) (newX - oldX));
chart.setCenterY(chart.getCenterY() + (int) (newY - oldY));
}
notifyPanListeners();
}
/**
* Notify the pan listeners about a pan.
*/
private synchronized void notifyPanListeners() {
for (PanListener listener : mPanListeners) {
listener.panApplied();
}
}
/**
* Adds a new pan listener.
*
* @param listener pan listener
*/
public synchronized void addPanListener(PanListener listener) {
mPanListeners.add(listener);
}
/**
* Removes a pan listener.
*
* @param listener pan listener
*/
public synchronized void removePanListener(PanListener listener) {
mPanListeners.add(listener);
}
}