Java异常与调优一站式解决方案

download:Java异常与调优一站式解决方案

项目异常不断，找不到问题所在？百度、Google搜个遍，也找不到答案？本课程针对Java开发中常见的各种异常，从日志、堆栈再深入到JVM，带你发现问题、定位问题、解决问题，最后在实战中搭建开箱即用的SpringBoot脚手架，强化巩固所学，助力你提升开发技能！

技术要求
基本的Java语法
理解Spring的思想和理念

环境参数
JDK 1.8、
SpringBoot 2.1.4.RELEASE

        canvas.drawLine(x1, y1, x2, y2, scoreRingPaint);
        axisLablePaint.setTextSize(axisLableTextSize);
        axisLablePaint.setTextAlign(Paint.Align.CENTER);
        axisLablePaint.setColor(mInnerScoreRingColor);
        float axisLable_fonth = getFontHeight(axisLablePaint);
        float labelRadius =innerScoreDiameter/2 - inner_ringWidth - axisLable_fonth/2 + 3;
        float x3 =  (float) (centerX + labelRadius * sinValue);
                float y3  =(float) (centerY + labelRadius * cosValue);
        canvas.save();
        canvas.rotate(90+ degree,x3,y3);    //绘製倾斜文字
        canvas.drawText(axisLabelStrs[i],x3,y3 + getFontCenterYToBaseLine(axisLablePaint),axisLablePaint);
        canvas.restore();
    }
    scoreTextPaint.setTextAlign(Paint.Align.CENTER);
    scoreTextPaint.setTextSize(scoreTextSize);
    scoreTextPaint.setColor(mScoreColor);
    double rAngle = Math.toRadians(90 - (-180 + offset_degree));    //弧度
    float offset_y = (float)(maxOutterScoreRadius*Math.cos(rAngle));
    float scoreBaselineY = centerY + offset_y;
    float tempH = getFontTopYToBaseline(scoreTextPaint);
    canvas.drawText(nFormat.format(score), centerX, scoreBaselineY, scoreTextPaint);
    scoreTextPaint.setTextSize(scoreTitleTextSize);
    scoreTextPaint.setColor(mScoreTitleColor);
    float scoreTitleBaselineY = scoreBaselineY - tempH - Tool.dpToPx(2);
    canvas.drawText(mScoreTitleStr, centerX, scoreTitleBaselineY, scoreTextPaint);
}
public static float getFontHeight(Paint textPaint){
    Paint.FontMetrics fm = textPaint.getFontMetrics();
    return (float)Math.ceil(fm.descent - fm.ascent) + 3;
}
public static float getFontTopYToBaseline(Paint textPaint){
    Paint.FontMetrics fm = textPaint.getFontMetrics();
    return (float)Math.ceil(-fm.ascent) + 3;
}
public static float getFontBottomYToBaseline(Paint textPaint){
    Paint.FontMetrics fm = textPaint.getFontMetrics();
    return (float)Math.ceil(fm.descent) + 3;
}
public static float getFontCenterYToBaseLine(Paint textPaint){
    Paint.FontMetrics fm = textPaint.getFontMetrics();
    float fonth = getFontHeight(textPaint);
    return (float)Math.abs(Math.ceil(fonth/2- fm.descent));
}