canvas常用方法

let paint=new Paint();
paint.setColor(Color.GRAY);
paint.setStyle(Paint.Style.STROKE);
paint.setStyle(Paint.Style.FILL);
paint.setStrokeWidth(20);
paint.setTextSize(10);
paint.setTextAlign(Paint.Align.CENTER);
paint.setXfermode(null);
// 方法 指定参数类型
p["setShadowLayer(float,float,float,int)"](100, 0, 0, new java.lang.Long(Color.RED));
p["setShadowLayer(float,float,float,int)"](100, 0, 0, $colors.RED);
// 构造函数 指定参数类型
let radialGradient = new RadialGradient["(float,float,float,int[],float[],android.graphics.Shader$TileMode)"](
  centerX,
  centerY,
  radius,
  radialColors,
  positionList,
  Shader.TileMode.REPEAT
);

fontMetrics = paint.getFontMetrics();
let contentHeight = fontMetrics.bottom - fontMetrics.top;
let textBound = new android.graphics.Rect();
let content = "公众号: 牙叔教程";
textPaint.getTextBounds(content, 0, content.length, textBound);
log(textBound.height());
let rect = new android.graphics.Rect();
paint.getTextBounds("1", 0, 1, rect);
textHeight = rect.height();

// 添加统一圆角的圆角矩形，
// rect：矩形区域，
// rx：椭圆圆角的横轴半径，
// ry：椭圆圆角的纵轴半径，
// dir：线的闭合方向（CW顺时针方向 | CCW逆时针方向）
mPath.addRoundRect(
  new RectF(0, 0, mRectF.right - 0, mRectF.bottom - 0),
  rx,
  y,
  Path.Direction.CW
);

let path = new Path();
// float x：圆心X轴坐标
// float y：圆心Y轴坐标
// float radius：圆半径
// Path.Direction有两个值：
// Path.Direction.CCW：是counter-clockwise缩写，指创建逆时针方向的矩形路径；
// Path.Direction.CW：是clockwise的缩写，指创建顺时针方向的矩形路径；
path.addCircle(x, y, radius, dir);

let path = new Path();
path.moveTo(x0, y0);
path.lineTo(x1, y1);
path.lineTo(x2, y2);
path.close();

canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
canvas.drawColor(android.graphics.Color.TRANSPARENT, android.graphics.PorterDuff.Mode.CLEAR);

canvas.drawColor(Color.RED);

// x, y, radius
// public void drawCircle (float cx, float cy, float radius, Paint paint)
canvas.drawCircle(500,500,500, paint);

// drawText(String text, float x, float y, Paint paint)
canvas.drawText('公众号: 牙叔教程', x, y, paint);

canvas.translate(x, y);

canvas.drawLine(x1, y1, x2, y2, paint);

let path = new Path();
path.addRect(rect, Path.Direction.CW);
canvas.clipPath(path);

var valueAnimator = android.animation.ValueAnimator.ofFloat(circle.y - radius - 66, circle.y + radius + 66);
valueAnimator.setDuration(4000);
valueAnimator.addUpdateListener(
  new android.animation.ValueAnimator.AnimatorUpdateListener({
    onAnimationUpdate: function (valueAnimator) {
      line.y = valueAnimator.getAnimatedValue();
    },
  })
);
valueAnimator.setRepeatCount(android.animation.ValueAnimator.INFINITE);
valueAnimator.start();