最是人间留不住,朱颜辞镜花辞树。这篇文章主要讲述Android自定义控件 芝麻信用分雷达图相关的知识,希望能为你提供帮助。
本文已授权微信公众号: 鸿洋( hongyangandroid) 在微信公众号平台原创首发。1.介绍 首先看下支付宝上芝麻信用分的效果图:
![Android自定义控件 芝麻信用分雷达图](http://img.readke.com/220413/051I3H42-0.jpg)
文章图片
2.思路
- 确定雷达图中心点坐标
- 绘制多边形及连接线
- 根据维度值绘制覆盖区域
- 绘制分数
- 绘制每个维度的标题文字和图标
public class CreditScoreView extends View {//数据个数
private int dataCount =
5;
//每个角的弧度
private float radian =
(float) (Math.PI * 2 / dataCount);
//雷达图半径
private float radius;
//中心X坐标
private int centerX;
//中心Y坐标
private int centerY;
//各维度标题
private String[] titles =
{"
履约能力"
, "
信用历史"
, "
人脉关系"
, "
行为偏好"
, "
身份特质"
};
//各维度图标
private int[] icons =
{R.mipmap.ic_performance, R.mipmap.ic_history, R.mipmap.ic_contacts,
R.mipmap.ic_predilection, R.mipmap.ic_identity};
//各维度分值
private float[] data =
{170, 180, 160, 170, 180};
//数据最大值
private float maxValue =
190;
//雷达图与标题的间距
private int radarMargin =
DensityUtils.dp2px(getContext(), 15);
//雷达区画笔
private Paint mainPaint;
//数据区画笔
private Paint valuePaint;
//分数画笔
private Paint scorePaint;
//标题画笔
private Paint titlePaint;
//图标画笔
private Paint iconPaint;
//分数大小
private int scoreSize =
DensityUtils.dp2px(getContext(), 28);
//标题文字大小
private int titleSize =
DensityUtils.dp2px(getContext(), 13);
...@
Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
//雷达图半径
radius =
Math.min(h, w) / 2 * 0.5f;
//中心坐标
centerX =
w / 2;
centerY =
h / 2;
postInvalidate();
super.onSizeChanged(w, h, oldw, oldh);
}...
}
绘制多边形和连接线 主要看下getPoint方法, 此方法封装了获取雷达图上各个点坐标的计算逻辑。
/**
* 绘制多边形
*
* @
param canvas 画布
*/
private void drawPolygon(Canvas canvas) {
Path path =
new Path();
for (int i =
0;
i <
dataCount;
i+
+
) {
if (i =
=
0) {
path.moveTo(getPoint(i).x, getPoint(i).y);
} else {
path.lineTo(getPoint(i).x, getPoint(i).y);
}
}//闭合路径
path.close();
canvas.drawPath(path, mainPaint);
}/**
* 绘制连接线
*
* @
param canvas 画布
*/
private void drawLines(Canvas canvas) {
Path path =
new Path();
for (int i =
0;
i <
dataCount;
i+
+
) {
path.reset();
path.moveTo(centerX, centerY);
path.lineTo(getPoint(i).x, getPoint(i).y);
canvas.drawPath(path, mainPaint);
}
}
getPoint方法, 参数radarMargin与percent在此步骤赋予默认值。
/**
* 获取雷达图上各个点的坐标
*
* @
param position 坐标位置(
右上角为0,
顺时针递增)
* @
return 坐标
*/
private Point getPoint(int position) {
return getPoint(position, 0, 1);
}/**
* 获取雷达图上各个点的坐标(
包括维度标题与图标的坐标)
*
* @
param position坐标位置
* @
param radarMargin 雷达图与维度标题的间距
* @
param percent覆盖区的的百分比
* @
return 坐标
*/
private Point getPoint(int position, int radarMargin, float percent) {
int x =
0;
int y =
0;
if (position =
=
0) {
x =
(int) (centerX +
(radius +
radarMargin) * Math.sin(radian) * percent);
y =
(int) (centerY - (radius +
radarMargin) * Math.cos(radian) * percent);
} else if (position =
=
1) {
x =
(int) (centerX +
(radius +
radarMargin) * Math.sin(radian / 2) * percent);
y =
(int) (centerY +
(radius +
radarMargin) * Math.cos(radian / 2) * percent);
} else if (position =
=
2) {
x =
(int) (centerX - (radius +
radarMargin) * Math.sin(radian / 2) * percent);
y =
(int) (centerY +
(radius +
radarMargin) * Math.cos(radian / 2) * percent);
} else if (position =
=
3) {
x =
(int) (centerX - (radius +
radarMargin) * Math.sin(radian) * percent);
y =
(int) (centerY - (radius +
radarMargin) * Math.cos(radian) * percent);
} else if (position =
=
4) {
x =
centerX;
y =
(int) (centerY - (radius +
radarMargin) * percent);
}return new Point(x, y);
}
![Android自定义控件 芝麻信用分雷达图](http://img.readke.com/220413/051I33047-1.jpg)
文章图片
绘制覆盖区域
/**
* 绘制覆盖区域
*
* @
param canvas 画布
*/
private void drawRegion(Canvas canvas) {
Path path =
new Path();
for (int i =
0;
i <
dataCount;
i+
+
) {
//计算百分比
float percent =
data[i] / maxValue;
int x =
getPoint(i, 0, percent).x;
int y =
getPoint(i, 0, percent).y;
if (i =
=
0) {
path.moveTo(x, y);
} else {
path.lineTo(x, y);
}
}//绘制填充区域的边界
path.close();
valuePaint.setStyle(Paint.Style.STROKE);
canvas.drawPath(path, valuePaint);
//绘制填充区域
valuePaint.setStyle(Paint.Style.FILL_AND_STROKE);
canvas.drawPath(path, valuePaint);
}
![Android自定义控件 芝麻信用分雷达图](http://img.readke.com/220413/051I34M7-2.jpg)
文章图片
绘制分数
/**
* 绘制分数
*
* @
param canvas 画布
*/
private void drawScore(Canvas canvas) {
int score =
0;
//计算总分
for (int i =
0;
i <
dataCount;
i+
+
) {
score +
=
data[i];
}
canvas.drawText(score +
"
"
, centerX, centerY +
scoreSize / 2, scorePaint);
}
![Android自定义控件 芝麻信用分雷达图](http://img.readke.com/220413/051I34E9-3.jpg)
文章图片
绘制标题
/**
* 绘制标题
*
* @
param canvas 画布
*/
private void drawTitle(Canvas canvas) {
for (int i =
0;
i <
dataCount;
i+
+
) {
int x =
getPoint(i, radarMargin, 1).x;
int y =
getPoint(i, radarMargin, 1).y;
Bitmap bitmap =
BitmapFactory.decodeResource(getResources(), icons[i]);
int iconHeight =
bitmap.getHeight();
float titleWidth =
titlePaint.measureText(titles[i]);
//底下两个角的坐标需要向下移动半个图片的位置(
1、2)
if (i =
=
1) {
y +
=
(iconHeight / 2);
} else if (i =
=
2) {
x -=
titleWidth;
y +
=
(iconHeight / 2);
} else if (i =
=
3) {
x -=
titleWidth;
} else if (i =
=
4) {
x -=
titleWidth / 2;
}
canvas.drawText(titles[i], x, y, titlePaint);
}
}
![Android自定义控件 芝麻信用分雷达图](http://img.readke.com/220413/051I33a8-4.jpg)
文章图片
绘制图标
/**
* 绘制图标
*
* @
param canvas 画布
*/
private void drawIcon(Canvas canvas) {
for (int i =
0;
i <
dataCount;
i+
+
) {
int x =
getPoint(i, radarMargin, 1).x;
int y =
getPoint(i, radarMargin, 1).y;
Bitmap bitmap =
BitmapFactory.decodeResource(getResources(), icons[i]);
int iconWidth =
bitmap.getWidth();
int iconHeight =
bitmap.getHeight();
float titleWidth =
titlePaint.measureText(titles[i]);
//上面获取到的x、y坐标是标题左下角的坐标
//需要将图标移动到标题上方居中位置
if (i =
=
0) {
x +
=
(titleWidth - iconWidth) / 2;
y -=
(iconHeight +
getTextHeight(titlePaint));
} else if (i =
=
1) {
x +
=
(titleWidth - iconWidth) / 2;
y -=
(iconHeight / 2 +
getTextHeight(titlePaint));
} else if (i =
=
2) {
x -=
(iconWidth +
(titleWidth - iconWidth) / 2);
y -=
(iconHeight / 2 +
getTextHeight(titlePaint));
} else if (i =
=
3) {
x -=
(iconWidth +
(titleWidth - iconWidth) / 2);
y -=
(iconHeight +
getTextHeight(titlePaint));
} else if (i =
=
4) {
x -=
iconWidth / 2;
y -=
(iconHeight +
getTextHeight(titlePaint));
}canvas.drawBitmap(bitmap, x, y, titlePaint);
}
}
/**
* 获取文本的高度
*
* @
param paint 文本绘制的画笔
* @
return 文本高度
*/
private int getTextHeight(Paint paint) {
Paint.FontMetrics fontMetrics =
paint.getFontMetrics();
return (int) (fontMetrics.descent - fontMetrics.ascent);
}
![Android自定义控件 芝麻信用分雷达图](http://img.readke.com/220413/051I3E35-5.jpg)
文章图片
OK, 到这里主要的绘制工作就完成了, 图标是在> 戳这里< 下载的, 有些图标实在找不到, 就用相似的代替了。
4.写在最后 还没有做适配, 以后会慢慢加上的, 欢迎Fork, 觉得还不错就Start一下吧!
点击下载源码
GitHub地址: https://github.com/alidili/SesameCreditScore
欢迎同学们吐槽评论, 如果你觉得本篇博客对你有用, 那么就留个言或者顶一下吧(^ - ^ )
【Android自定义控件 芝麻信用分雷达图】感谢:
http://blog.csdn.net/u013831257/article/details/50784565
http://blog.csdn.net/crazy__chen/article/details/50163693
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