/*
* ModeShape (http://www.modeshape.org)
*
* 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.modeshape.web.client.chart;
import com.google.gwt.widgetideas.graphics.client.Color;
import com.google.gwt.widgetideas.graphics.client.GWTCanvas;
import com.smartgwt.client.types.Alignment;
import com.smartgwt.client.types.VerticalAlignment;
import com.smartgwt.client.util.Format;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.Label;
import com.smartgwt.client.widgets.layout.HLayout;
import com.smartgwt.client.widgets.layout.VLayout;
/**
*
* @author kulikov
*/
public class Chart extends VLayout {
private final static int LABEL_SIZE = 30;
private final static int Y_SCALE = 10;
private YAxis yAxis = new YAxis();
private XAxis xAxis = new XAxis();
private int X, Y;
private ViewPort viewPort = new ViewPort();
private GWTCanvas canvas;
/**
* Creates chart with given title.
*
* @param title chart's title.
*/
public Chart(String title) {
setWidth100();
setHeight100();
init();
}
public final void init() {
Title title = new Title("");
title.setWidth100();
title.setHeight(30);
addMember(title);
HLayout layout = new HLayout();
layout.setWidth100();
layout.setHeight100();
layout.addMember(yAxis);
layout.addMember(viewPort);
addMember(layout);
addMember(xAxis);
addMember(new Footer());
}
public void drawChart(String[] xl, double[] x, double[] y1, double[] y2, double[] y3) {
viewPort.drawChart(xl, x, y1, y2, y3);
}
private class Title extends VLayout {
public Title(String title) {
setContents(title);
}
}
private class Footer extends VLayout {
public Footer() {
HLayout layout = new HLayout();
addMember(layout);
Label strut = new Label();
strut.setWidth(LABEL_SIZE);
Label min = new Label("<span style=\"color:red\">Min</span>");
Label max = new Label("<span style=\"color:blue\">Max</span>");
Label avg = new Label("<span style=\"color:green\">Average</span>");
layout.addMember(strut);
layout.addMember(min);
layout.addMember(max);
layout.addMember(avg);
}
}
/**
* YAxis.
*/
private class YAxis extends VLayout {
public YAxis() {
setWidth(LABEL_SIZE);
setHeight100();
}
private void clean() {
Canvas[] members = this.getMembers();
for (int i = 0; i < members.length; i++) {
this.removeMember(members[i]);
}
}
public void drawLabels(String[] x) {
clean();
int j = x.length - 1;
for (int i = 0; i < x.length; i++) {
addMember(new YLabel(x[j--]));
}
}
}
/**
* Label for Y axis.
*
*/
private class YLabel extends Label {
public YLabel(String v) {
setWidth100();
setHeight100();
setContents(v);
setAlign(Alignment.CENTER);
setLayoutAlign(Alignment.CENTER);
setLayoutAlign(VerticalAlignment.BOTTOM);
setValign(VerticalAlignment.BOTTOM);
}
}
private class XAxis extends HLayout {
public XAxis() {
setHeight(LABEL_SIZE);
setWidth100();
}
private void clean() {
Canvas[] members = this.getMembers();
for (int i = 0; i < members.length; i++) {
this.removeMember(members[i]);
}
}
public void drawLabels(String[] x) {
clean();
Label strut = new Label();
strut.setWidth(LABEL_SIZE);
strut.setHeight(LABEL_SIZE);
addMember(strut);
for (int i = 0; i < x.length; i++) {
addMember(new XLabel(x[i]));
}
}
}
private class XLabel extends Label {
public XLabel(String v) {
setWidth100();
setHeight100();
setContents(v);
setAlign(Alignment.LEFT);
setLayoutAlign(Alignment.LEFT);
}
}
private class ViewPort extends HLayout {
private final Color COLOR[] = new Color[]{Color.RED, Color.BLUE, Color.GREEN};
public ViewPort() {
setWidth100();
setHeight100();
setBorder("2px solid black");
}
private void drawGrid(int N, int M) {
if (canvas == null) {
canvas = new GWTCanvas(getWidth(), getHeight());
addMember(canvas);
} else {
canvas.clear();
}
//draw horizontal lines
X = canvas.getCoordWidth();
Y = canvas.getCoordHeight();
double dx = X / N;
double dy = Y / M;
canvas.beginPath();
canvas.setLineWidth(1);
canvas.setStrokeStyle(Color.BLACK);
for (int i = 0; i < N; i++) {
double x = dx * (i + 1);
canvas.moveTo(x, 0);
canvas.lineTo(x, Y);
}
//draw vertical lines
int j = M -1;
for (int i = 0; i < M; i++) {
double y = Y - dy * (j--);
canvas.moveTo(0, y);
canvas.lineTo(X, y);
}
canvas.stroke();
}
private void drawLine(double[] y, double min, double max, Color color) {
canvas.beginPath();
canvas.setLineWidth(2);
canvas.setStrokeStyle(color);
double xScale = X / y.length;
double yScale = Y / (max - min);
for (int i = 0; i < y.length -1; i++) {
canvas.moveTo(i * xScale, Y - (y[i] - min) * yScale);
canvas.lineTo((i + 1)* xScale, Y - (y[i + 1] - min) * yScale);
}
canvas.stroke();
}
private String[] yLabels(double[]... y) {
String[] labels = new String[Y_SCALE];
double min = min(y);
double max = max(y);
double s = (max - min)/Y_SCALE;
for (int i = 0; i < Y_SCALE; i++) {
labels[i] = Format.toUSString((min + i * s), 2);
}
return labels;
}
public void drawChart(String[] xLabels, double[] x, double[]... y) {
String[] yLabels = yLabels(y);
yAxis.drawLabels(yLabels);
xAxis.drawLabels(xLabels);
double min = min(y);
double max = max(y);
drawGrid(xLabels.length, yLabels.length);
for (int i = 0; i < y.length; i++) {
drawLine(y[i], min, max, COLOR[i]);
}
}
private double min(double[]... x) {
double min = x[0][0];
for (int j = 0; j < x.length; j++ ) {
for (int i = 0; i < x[j].length; i++) {
if (x[j][i] < min) min = x[j][i];
}
}
return min;
}
private double max(double[]... x) {
double max = x[0][0];
for (int j = 0; j < x.length; j++) {
for (int i = 0; i < x[j].length; i++) {
if (x[j][i] > max) max = x[j][i];
}
}
return max;
}
}
}