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/**
* Copyright (C) 2019 dj6082013
*
* 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 com.codename1.charts.views;
import com.codename1.charts.compat.Canvas;
import com.codename1.charts.compat.Paint;
import com.codename1.charts.compat.Paint.Style;
import com.codename1.charts.models.AreaSeries;
import com.codename1.charts.renderers.DefaultRenderer;
import com.codename1.charts.renderers.SimpleSeriesRenderer;
import com.codename1.charts.util.ColorUtil;
import com.codename1.ui.geom.Rectangle2D;
import java.util.ArrayList;
import java.util.List;
/**
* The radar chart rendering class.
*/
public class RadarChart extends RoundChart {
/**
* The series dataset.
*/
private AreaSeries mDataset;
/**
* A step variable to control the size of the legend shape.
*/
private int mStep;
/**
* Builds a new radar chart instance.
*
* @param dataset the series dataset
* @param renderer the series renderer
*/
public RadarChart(AreaSeries dataset, DefaultRenderer renderer) {
super(null, renderer);
mDataset = dataset;
}
/**
* The graphical representation of the radar chart.
*
* @param canvas the canvas to paint to
* @param x the top left x value of the view to draw to
* @param y the top left y value of the view to draw to
* @param width the width of the view to draw to
* @param height the height of the view to draw to
* @param paint the paint
*/
@Override
public void draw(Canvas canvas, int x, int y, int width, int height, Paint paint) {
paint.setAntiAlias(mRenderer.isAntialiasing());
paint.setStyle(Style.FILL);
paint.setTextSize(mRenderer.getLabelsTextSize());
int legendSize = getLegendSize(mRenderer, height / 5, 0);
int left = x;
int top = y;
int right = x + width;
int cLength = mDataset.getCategoriesCount();
if (cLength < 3){
return;
}
String[] categories = mDataset.getCategories();
int bottom = y + height - legendSize;
drawBackground(mRenderer, canvas, x, y, width, height, paint, false, DefaultRenderer.NO_COLOR);
mStep = SHAPE_WIDTH * 3 / 4;
int mRadius = Math.min(Math.abs(right - left), Math.abs(bottom - top));
double rCoef = 0.35 * mRenderer.getScale();
double decCoef = 0.2;
int radius = (int) (mRadius * rCoef);
if (autoCalculateCenter || mCenterX == NO_VALUE) {
mCenterX = (left + right) / 2;
}
if (autoCalculateCenter || mCenterY == NO_VALUE) {
mCenterY = (bottom + top) / 2;
}
float shortRadius = radius;
float longRadius = radius * 1.1f;
List prevLabelsBounds = new ArrayList();
float currentAngle = mRenderer.getStartAngle();
float angle = 360f / cLength;
// Draw web
float centerX = (left + right) / 2, centerY = (top + bottom) / 2;
for (int i = 0; i < cLength; i++) {
paint.setColor(ColorUtil.GRAY);
float thisRad = (float) Math.toRadians(90 - currentAngle);
float nextRad = (float) Math.toRadians(90 - (currentAngle + angle));
for (float level = 0; level <= 1f; level += decCoef) {
float thisX = (float) (centerX - Math.sin(thisRad) * radius * level);
float thisY = (float) (centerY - Math.cos(thisRad) * radius * level);
float nextX = (float) (centerX - Math.sin(nextRad) * radius * level);
float nextY = (float) (centerY - Math.cos(nextRad) * radius * level);
canvas.drawLine(thisX, thisY, nextX, nextY, paint);
}
canvas.drawLine(centerX, centerY, centerX - (float) Math.sin(thisRad) * radius, centerY - (float) Math.cos(thisRad) * radius, paint);
paint.setColor(ColorUtil.GRAY);
if(cLength % 2 == 0){
drawLabel(canvas, categories[i], mRenderer, prevLabelsBounds, mCenterX, mCenterY,
shortRadius, longRadius, currentAngle - angle / 2 , angle, left, right, mRenderer.getLabelsColor(),
paint, true, false);
}else{
drawLabel(canvas, categories[i], mRenderer, prevLabelsBounds, mCenterX, mCenterY,
shortRadius, longRadius, currentAngle, angle, left, right, mRenderer.getLabelsColor(),
paint, true, false);
}
currentAngle += angle;
}
// Draw area
int sLength = mDataset.getSeriesCount();
int alignment = cLength / 2;
for (int i = 0; i < sLength; i++) {
currentAngle = mRenderer.getStartAngle();
paint.setColor(mRenderer.getSeriesRendererAt(i).getColor());
for (int j = 0; j < cLength; j++) {
float thisValue = (float) mDataset.getValue(i, categories[(j + alignment) % cLength]);
float nextValue = (float) mDataset.getValue(i, categories[(j + alignment + 1) % cLength]);
float thisRad = (float) Math.toRadians(90 - currentAngle);
float nextRad = (float) Math.toRadians(90 - (currentAngle + angle));
float thisX = (float) (centerX - Math.sin(thisRad) * radius * thisValue);
float thisY = (float) (centerY - Math.cos(thisRad) * radius * thisValue);
float nextX = (float) (centerX - Math.sin(nextRad) * radius * nextValue);
float nextY = (float) (centerY - Math.cos(nextRad) * radius * nextValue);
canvas.drawLine(thisX, thisY, nextX, nextY, paint);
currentAngle += angle;
}
}
// Draw Background
if (mRenderer.getBackgroundColor() != 0) {
paint.setColor(mRenderer.getBackgroundColor());
} else {
paint.setColor(ColorUtil.WHITE);
}
prevLabelsBounds.clear();
drawLegend(canvas, mRenderer, mDataset.getSeries(), left, right, y, width, height, legendSize, paint,
false);
drawTitle(canvas, x, y, width, paint);
}
/**
* Returns the legend shape width.
*
* @param seriesIndex the series index
* @return the legend shape width
*/
@Override
public int getLegendShapeWidth(int seriesIndex) {
return SHAPE_WIDTH;
}
/**
* The graphical representation of the legend shape.
*
* @param canvas the canvas to paint to
* @param renderer the series renderer
* @param x the x value of the point the shape should be drawn at
* @param y the y value of the point the shape should be drawn at
* @param seriesIndex the series index
* @param paint the paint to be used for drawing
*/
@Override
public void drawLegendShape(Canvas canvas, SimpleSeriesRenderer renderer, float x, float y, int seriesIndex, Paint paint) {
canvas.drawCircle(x + SHAPE_WIDTH - mStep, y, mStep, paint);
mStep--;
}
}
