Android自定义View绘制彩色圆弧
本文实例为大家分享了Android自定义View绘制彩色圆弧的具体代码,供大家参考,具体内容如下
让客户满意是我们工作的目标,不断超越客户的期望值来自于我们对这个行业的热爱。我们立志把好的技术通过有效、简单的方式提供给客户,将通过不懈努力成为客户在信息化领域值得信任、有价值的长期合作伙伴,公司提供的服务项目有:域名注册、虚拟主机、营销软件、网站建设、平阴网站维护、网站推广。
效果如下:
自定义View代码如下:
package com.example.yan; import android.content.Context; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Rect; import android.graphics.RectF; import android.graphics.Shader; import android.graphics.SweepGradient; import android.util.AttributeSet; import android.view.View; /** * Created by xiaoyanzi on 2016/3/18. * 渐变圆弧 */ public class GradualView extends View { private Context context; private Paint paint;//画笔 private Paint paintFull;//实心圆画笔 private Paint textPaint;//标识字画笔 private Paint valuePaint;//移动小球画笔 private int[] mColors;//渐变色数组 private int centerX;//中心X private int centerY;//中心Y private int srcH;//控件高度 private float startAngle = 110;//圆弧起始角度 private float sweepAngle = 320;//圆弧所占度数 private float airValue = 66; /** * 直接在代码中调用时,使用该函数 * * @param context */ public GradualView(Context context) { super(context); initData(context); } /** * 在xml中使用自定义view时,使用这个函数 * * @param context * @param attrs */ public GradualView(Context context, AttributeSet attrs) { super(context, attrs); initData(context); } /** * 可以由上一个函数中手动调用 * * @param context * @param atrrs * @param defStyle 自定义函数中的attrs表示view的属性集,defStyle表示默认的属性资源集的id */ public GradualView(Context context, AttributeSet atrrs, int defStyle) { super(context, atrrs, defStyle); } /** * 初始化 * @param context */ private void initData(Context context) { this.context = context; paint = new Paint(Paint.ANTI_ALIAS_FLAG); paint.setStyle(Paint.Style.STROKE); mColors = new int[]{ 0xFF660099,//紫色 0xFF330033,//褐色 0xFF99FF00,//草绿色 0xFFFFFF00,//黄色 0xFFFF6600,//橘色 0xFFFF0000,//红色 0xFF660099,//紫色 }; Shader s = new SweepGradient(0, 0, mColors, null); paint.setAntiAlias(true);//设置画笔为无锯齿 paint.setStrokeWidth(dip2px(context, 14));//线宽 paint.setShader(s); paintFull = new Paint(Paint.ANTI_ALIAS_FLAG); paintFull.setStyle(Paint.Style.FILL_AND_STROKE); paintFull.setAntiAlias(true);//设置画笔为无锯齿 paintFull.setShader(s); textPaint = new Paint(Paint.ANTI_ALIAS_FLAG); textPaint.setTextSize(dip2px(context, 22));//设置字体大小 textPaint.setColor(0xFFFFFFFF); valuePaint = new Paint(Paint.ANTI_ALIAS_FLAG); valuePaint.setAntiAlias(true);//设置画笔为无锯齿 } public void setAirValue(float airValue) { this.airValue = airValue; } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); srcH = h; centerX = w / 2; centerY = h / 2; } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); float r = srcH / 2 - paint.getStrokeWidth() * 0.5f - dip2px(context, 200); //移动中心 canvas.translate(centerX, centerY); RectF oval = new RectF(); oval.left = -r;//左边 oval.top = -r;//上边 oval.right = r;//右边 oval.bottom = r;//下边 canvas.drawArc(oval, startAngle, sweepAngle, false, paint); //绘制圆弧 //绘制圆弧两头的小圆 float mr = dip2px(context, 7); float x1 = (float) (-r * Math.sin((360 - sweepAngle) / 2 * Math.PI / 180)); float y1 = (float) (r * Math.cos((360 - sweepAngle) / 2 * Math.PI / 180)); canvas.drawCircle(x1, y1, mr, paintFull); float x2 = (float) (r * Math.sin((360 - sweepAngle) / 2 * Math.PI / 180)); float y2 = (float) (r * Math.cos((360 - sweepAngle) / 2 * Math.PI / 180)); canvas.drawCircle(x2, y2, mr, paintFull); //小圆离球的距离 float range = r + dip2px(context, 30); float ar = 12f; //画周围小球和数字 float ax1 = (float) (-range * Math.sin(45 * Math.PI / 180)); float ay1 = (float) (range * Math.cos(45 * Math.PI / 180)); canvas.drawCircle(ax1, ay1, ar, paintFull); canvas.drawText("0", ax1 - getTextW() * 3, ay1 + getTextH() / 2, textPaint); float ax2 = -range; float ay2 = 0; canvas.drawCircle(ax2, ay2, ar, paintFull); canvas.drawText("50", ax2 - getTextW() * 5, ay2 + getTextH() / 2, textPaint); float ax3 = (float) (-range * Math.sin(45 * Math.PI / 180)); float ay3 = (float) (-range * Math.cos(45 * Math.PI / 180)); canvas.drawCircle(ax3, ay3, ar, paintFull); canvas.drawText("100", ax3 - getTextW() * 7, ay3 + getTextH() / 2, textPaint); float ax4 = 0; float ay4 = -range; canvas.drawCircle(ax4, ay4, ar, paintFull); canvas.drawText("150", ax4 - getTextW() * 3, ay4 - getTextH(), textPaint); float ax5 = (float) (range * Math.sin(45 * Math.PI / 180)); float ay5 = (float) (-range * Math.cos(45 * Math.PI / 180)); canvas.drawCircle(ax5, ay5, ar, paintFull); canvas.drawText("200", ax5 + getTextW(), ay5 + getTextH() / 2, textPaint); float ax6 = range; float ay6 = 0; canvas.drawCircle(ax6, ay6, ar, paintFull); canvas.drawText("300", ax6 + getTextW(), ay6 + getTextH() / 2, textPaint); float ax7 = (float) (range * Math.sin(45 * Math.PI / 180)); float ay7 = (float) (range * Math.cos(45 * Math.PI / 180)); canvas.drawCircle(ax7, ay7, ar, paintFull); canvas.drawText("500", ax7 + getTextW(), ay7 + getTextH() / 2, textPaint); //画标识小球 valuePaint.setColor(0xFFFFFFFF); float cx; float cy; if (airValue >= 0 && airValue <= 50) { cx = (float) (-r * Math.cos((45 - airValue * 0.9) * Math.PI / 180)); cy = (float) (r * Math.sin((45 - airValue * 0.9) * Math.PI / 180)); } else if (airValue > 50 && airValue <= 150) { cx = (float) (-r * Math.cos((airValue * 0.9 - 45) * Math.PI / 180)); cy = (float) (-r * Math.sin((airValue * 0.9 - 45) * Math.PI / 180)); } else if (airValue > 150 && airValue <= 200) { cx = (float) (-r * Math.cos((airValue * 0.9 - 45) * Math.PI / 180)); cy = (float) (-r * Math.sin((airValue * 0.9 - 45) * Math.PI / 180)); } else if (airValue > 200 && airValue <= 300) { cx = (float) (-r * Math.cos((airValue * 0.45 + 45) * Math.PI / 180)); cy = (float) (-r * Math.sin((airValue * 0.45 + 45) * Math.PI / 180)); } else if (airValue > 300 && airValue <= 500) {//此处有问题 cx = (float) (r * Math.cos(((airValue - 300) * 0.225) * Math.PI / 180)); cy = (float) (r * Math.sin(((airValue - 300) * 0.225) * Math.PI / 180)); } else { cx = (float) (-r * Math.cos(45 * Math.PI / 180)); cy = (float) (r * Math.sin(45 * Math.PI / 180)); } canvas.drawCircle(cx, cy, dip2px(context, 11), valuePaint); canvas.drawCircle(cx, cy, dip2px(context, 4), paintFull); } /** * dip转px * @param context * @param dpValue * @return */ private int dip2px(Context context, float dpValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (dpValue * scale + 0.5f); } /** * 获取"正"的高度 * * @return */ private float getTextH() { Paint pFont = new Paint(); Rect rect = new Rect(); //返回包围整个字符串的最小的一个Rect区域 pFont.getTextBounds("正", 0, 1, rect); return rect.height(); } /** * 获取"正"的宽度 * * @return */ private float getTextW() { Paint pFont = new Paint(); Rect rect = new Rect(); //返回包围整个字符串的最小的一个Rect区域 pFont.getTextBounds("正", 0, 1, rect); return rect.width(); } }
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持创新互联。
当前名称:Android自定义View绘制彩色圆弧
网站网址:http://pwwzsj.com/article/pdehje.html