android开发自定义View(四)仿掌上英雄联盟能力值分析效果
原文出处:http://blog.csdn.net/as7210636/article/details/52692102
原始图效果
模仿效果
png
gif
流程
-
绘制中心线,用于计算外层多边形各点的坐标
-
绘制最外层多边形
-
分析原型图算出每个多边形之间的间距
-
绘制里三层多边形
-
绘制字体
-
根据进度值绘制等级进度
难点
关键在于坐标的计算(三角函数的运用,哈哈),与旋转角度的掌控。
绘制中心线
/**
* 绘制中心线
*
* @param canvas
*/
private void center(Canvas canvas) {
//绘制七边形中心线
canvas.save();//保存当前状态
canvas.rotate(0, center, center);
float startY = getPaddingTop() + 2 * str_rect.height();
float endY = center;
float du = (float) (360 / 7 + 0.5);
for (int i = 0; i < 7; i++) {
canvas.drawLine(center, startY, center, endY, center_paint);
canvas.rotate(du, center, center);
}
canvas.restore();//恢复之前状态
}
先计算出圆心到A点的坐标,
在计算出旋转的角度(360/7),
然后旋转7次Canvas,绘制7条中心线。
为了加深显示效果,先绘制一个绿色背景作参考。
绘制最外层正七边形
各坐标点的计算主要用到了三角函数。
A点
x : 对应圆心center。
y :paddingTop+2个字体高度的距离
B点
x : A点的x坐标+EB
利用三角函数公式,BE=sin(AB的夹角)*OB
这里有个坑,Math.sin(x)里的x是弧度,而不是角度。
如果要计算角度则需要加上Math.sin(Math.toRadians(x))
center+ Math.sin(Math.toRadians(360/7)) *one_radius
y :A点的y坐标+AE
同理AE=OA-OE,OE=cos(AB的夹角)*OB
OE=cos(AB的夹角)*OB
Math.abs(Math.cos(Math.toRadians(360/7)) *one_radius
由于余弦有正负值,这里要取绝对值
AE=OA-OE
(getPaddingTop() +2*str_rect.height() +one_radius
- Math.abs(Math.cos(Math.toRadians(360/7)) *one_radius))
C点
x :圆心X+FC
Math.sin(Math.toRadians(360/7+360/7/2)) *one_radius
y: 圆心Y+OF
(Math.cos(Math.toRadians(360/7+360/7/2)) *one_radius) +center
D点
x :圆心x+HD
center+ Math.sin(Math.toRadians(360/7/2)) *one_radius
y:圆心y+OH
Math.cos(Math.toRadians(360/7/2)) *one_radius) +center
右边点绘制完后,左边点自然就简单了,y位置一样,x位置只需要把相加改成相减即可。
绘制内三层正七边形
绘制完最外层七边形后,剩下来的就好办了,只需要计算出每个七边形的间距即可。
由原型图分析,每一个正七边形占半径的四分之一。
/**
* 绘制第二层多边形
*
* @param canvas
*/
private void twoPolygons(Canvas canvas) {
distance = one_radius / 4;
Path path = new Path();
path.moveTo(center, getPaddingTop() + 2 * str_rect.height() + distance); //起始点
path.lineTo((float) (center + Math.sin(Math.toRadians(360 / 7)) * (one_radius - distance)), (float) (getPaddingTop() + 2 * str_rect.height() + (one_radius) - Math.abs(Math.cos(Math.toRadians(360 / 7)) * (one_radius - distance))));
path.lineTo((float) (center + Math.sin(Math.toRadians(360 / 7 + 360 / 7 / 2)) * (one_radius - distance)), (float) (Math.cos(Math.toRadians(360 / 7 + 360 / 7 / 2)) * (one_radius - distance)) + center);
path.lineTo((float) (center + Math.sin(Math.toRadians(360 / 7 / 2)) * (one_radius - distance)), (float) (Math.cos(Math.toRadians(360 / 7 / 2)) * (one_radius - distance)) + center);
path.lineTo((float) (center - Math.sin(Math.toRadians(360 / 7 / 2)) * (one_radius - distance)), (float) (Math.cos(Math.toRadians(360 / 7 / 2)) * (one_radius - distance)) + center);
path.lineTo((float) (center - Math.sin(Math.toRadians(360 / 7 + 360 / 7 / 2)) * (one_radius - distance)), (float) (Math.cos(Math.toRadians(360 / 7 + 360 / 7 / 2)) * (one_radius - distance)) + center);
path.lineTo((float) (center - Math.sin(Math.toRadians(360 / 7)) * (one_radius - distance)), (float) (getPaddingTop() + 2 * str_rect.height() + (one_radius) - Math.abs(Math.cos(Math.toRadians(360 / 7)) * (one_radius - distance))));
path.close();
canvas.drawPath(path, two_paint);
}
/**
* 绘制第三层多边形
*
* @param canvas
*/
private void threePolygons(Canvas canvas) {
distance = one_radius / 2;
Path path = new Path();
path.moveTo(center, getPaddingTop() + 2 * str_rect.height() + distance); //起始点
path.lineTo((float) (center + Math.sin(Math.toRadians(360 / 7)) * (one_radius - distance)), (float) (getPaddingTop() + 2 * str_rect.height() + (one_radius) - Math.abs(Math.cos(Math.toRadians(360 / 7)) * (one_radius - distance))));
path.lineTo((float) (center + Math.sin(Math.toRadians(360 / 7 + 360 / 7 / 2)) * (one_radius - distance)), (float) (Math.cos(Math.toRadians(360 / 7 + 360 / 7 / 2)) * (one_radius - distance)) + center);
path.lineTo((float) (center + Math.sin(Math.toRadians(360 / 7 / 2)) * (one_radius - distance)), (float) (Math.cos(Math.toRadians(360 / 7 / 2)) * (one_radius - distance)) + center);
path.lineTo((float) (center - Math.sin(Math.toRadians(360 / 7 / 2)) * (one_radius - distance)), (float) (Math.cos(Math.toRadians(360 / 7 / 2)) * (one_radius - distance)) + center);
path.lineTo((float) (center - Math.sin(Math.toRadians(360 / 7 + 360 / 7 / 2)) * (one_radius - distance)), (float) (Math.cos(Math.toRadians(360 / 7 + 360 / 7 / 2)) * (one_radius - distance)) + center);
path.lineTo((float) (center - Math.sin(Math.toRadians(360 / 7)) * (one_radius - distance)), (float) (getPaddingTop() + 2 * str_rect.height() + (one_radius) - Math.abs(Math.cos(Math.toRadians(360 / 7)) * (one_radius - distance))));
path.close();
canvas.drawPath(path, three_paint);
}
/**
* 绘制最内层多边形
*
* @param canvas
*/
private void fourPolygons(Canvas canvas) {
distance = one_radius / 2 + one_radius / 4;
Path path = new Path();
path.moveTo(center, getPaddingTop() + 2 * str_rect.height() + distance); //起始点
path.lineTo((float) (center + Math.sin(Math.toRadians(360 / 7)) * (one_radius - distance)), (float) (getPaddingTop() + 2 * str_rect.height() + (one_radius) - Math.abs(Math.cos(Math.toRadians(360 / 7)) * (one_radius - distance))));
path.lineTo((float) (center + Math.sin(Math.toRadians(360 / 7 + 360 / 7 / 2)) * (one_radius - distance)), (float) (Math.cos(Math.toRadians(360 / 7 + 360 / 7 / 2)) * (one_radius - distance)) + center);
path.lineTo((float) (center + Math.sin(Math.toRadians(360 / 7 / 2)) * (one_radius - distance)), (float) (Math.cos(Math.toRadians(360 / 7 / 2)) * (one_radius - distance)) + center);
path.lineTo((float) (center - Math.sin(Math.toRadians(360 / 7 / 2)) * (one_radius - distance)), (float) (Math.cos(Math.toRadians(360 / 7 / 2)) * (one_radius - distance)) + center);
path.lineTo((float) (center - Math.sin(Math.toRadians(360 / 7 + 360 / 7 / 2)) * (one_radius - distance)), (float) (Math.cos(Math.toRadians(360 / 7 + 360 / 7 / 2)) * (one_radius - distance)) + center);
path.lineTo((float) (center - Math.sin(Math.toRadians(360 / 7)) * (one_radius - distance)), (float) (getPaddingTop() + 2 * str_rect.height() + (one_radius) - Math.abs(Math.cos(Math.toRadians(360 / 7)) * (one_radius - distance))));
path.close();
canvas.drawPath(path, four_paint);
}
去掉绿色背景后,显示的效果
绘制字体
根据最外层多边形各点坐标以及字体的长度高度 微调。
privateRectstr_rect;//字体矩形
String\[\]str= {"击杀","生存","助攻","物理","魔法","防御","金钱"};
/**
* 绘制字体
*
* @param canvas
*/
private void PaintFout(Canvas canvas) {
canvas.drawText(str\[0\], center - str_rect.width() / 2, (float) (getPaddingTop() + 1.5 * str_rect.height()), str_paint);
canvas.drawText(str\[1\], (float) (center + Math.sin(Math.toRadians(360 / 7)) * one_radius + str_rect.height() / 2), (float) ((getPaddingTop() + 2 * str_rect.height() + one_radius - Math.abs(Math.cos(Math.toRadians(360 / 7)) * one_radius))), str_paint);
canvas.drawText(str\[2\], (float) (center + Math.sin(Math.toRadians(360 / 7 + 360 / 7 / 2)) * one_radius + str_rect.height() / 2), (float) (Math.cos(Math.toRadians(360 / 7 + 360 / 7 / 2)) * one_radius) + center + str_rect.height() / 2, str_paint);
canvas.drawText(str\[3\], (float) (center + Math.sin(Math.toRadians(360 / 7 / 2)) * one_radius - str_rect.height() / 2 + str_rect.width() / 2), (float) ((Math.cos(Math.toRadians(360 / 7 / 2)) * one_radius) + center + str_rect.height()), str_paint);
canvas.drawText(str\[4\], (float) (center - Math.sin(Math.toRadians(360 / 7 / 2)) * one_radius + str_rect.height() / 2 - str_rect.width() * 1.5), (float) ((Math.cos(Math.toRadians(360 / 7 / 2)) * one_radius) + center + str_rect.height()), str_paint);
canvas.drawText(str\[5\], (float) (center - Math.sin(Math.toRadians(360 / 7 + 360 / 7 / 2)) * one_radius - str_rect.height() / 2 - str_rect.width()), (float) (Math.cos(Math.toRadians(360 / 7 + 360 / 7 / 2)) * one_radius) + center + str_rect.height() / 2, str_paint);
canvas.drawText(str\[6\], (float) (center - Math.sin(Math.toRadians(360 / 7)) * one_radius - str_rect.height() / 2 - str_rect.width()), (float) ((getPaddingTop() + 2 * str_rect.height() + one_radius - Math.abs(Math.cos(Math.toRadians(360 / 7)) * one_radius))), str_paint);
}
绘制各能力值进度
/**
* 绘制等级进度
*/
private void PaintRank(Canvas canvas) {
Path path = new Path();
path.moveTo(center, getPaddingTop() + 2 * str_rect.height() + f1); //起始点
path.lineTo((float) (center + Math.sin(Math.toRadians(360 / 7)) * (one_radius - f2)), (float) (getPaddingTop() + 2 * str_rect.height() + (one_radius) - Math.abs(Math.cos(Math.toRadians(360 / 7)) * (one_radius - f2))));
path.lineTo((float) (center + Math.sin(Math.toRadians(360 / 7 + 360 / 7 / 2)) * (one_radius - f3)), (float) (Math.cos(Math.toRadians(360 / 7 + 360 / 7 / 2)) * (one_radius - f3)) + center);
path.lineTo((float) (center + Math.sin(Math.toRadians(360 / 7 / 2)) * (one_radius - f4)), (float) (Math.cos(Math.toRadians(360 / 7 / 2)) * (one_radius - f4)) + center);
path.lineTo((float) (center - Math.sin(Math.toRadians(360 / 7 / 2)) * (one_radius - f5)), (float) (Math.cos(Math.toRadians(360 / 7 / 2)) * (one_radius - f5)) + center);
path.lineTo((float) (center - Math.sin(Math.toRadians(360 / 7 + 360 / 7 / 2)) * (one_radius - f6)), (float) (Math.cos(Math.toRadians(360 / 7 + 360 / 7 / 2)) * (one_radius - f6)) + center);
path.lineTo((float) (center - Math.sin(Math.toRadians(360 / 7)) * (one_radius - f7)), (float) (getPaddingTop() + 2 * str_rect.height() + (one_radius) - Math.abs(Math.cos(Math.toRadians(360 / 7)) * (one_radius - f7))));
path.close();
canvas.drawPath(path, mPaint);
}
感兴趣的同学可直接到github下载源码查看。
如果你觉得还不错,可以给个star,支持下,谢谢了!
https://github.com/jiangzehui/polygonsview