/**
* draw lines
*
* <p>ラインを書く
*
* <p>绘制线条
*
* @param canvas
*/
protected void drawAreas(Canvas canvas) {
// distance between two points
float lineLength = ((super.getWidth() - super.getAxisMarginLeft()) / displayNumber) - 1;
// start point‘s X
float startX;
float lastY = 0;
float lastX = 0;
LineEntity<DateValueEntity> line1 = (LineEntity<DateValueEntity>) bandData.get(0);
LineEntity<DateValueEntity> line2 = (LineEntity<DateValueEntity>) bandData.get(1);
if (line1.isDisplay() && line2.isDisplay()) {
Paint mPaint = new Paint();
mPaint.setColor(line1.getLineColor());
mPaint.setAlpha(70);
mPaint.setAntiAlias(true);
List<DateValueEntity> line1Data = line1.getLineData();
List<DateValueEntity> line2Data = line2.getLineData();
// set start point’s X
startX = super.getAxisMarginLeft() + lineLength / 2f;
Path areaPath = new Path();
if (line1Data != null && line2Data != null) {
for (int j = displayFrom; j < displayFrom + displayNumber; j++) {
float value1 = line1Data.get(j).getValue();
float value2 = line2Data.get(j).getValue();
// calculate Y
float valueY1 =
(float)
((1f - (value1 - this.getMinValue()) / (this.getMaxValue() - this.getMinValue()))
* (super.getHeight() - super.getAxisMarginBottom()));
float valueY2 =
(float)
((1f - (value2 - this.getMinValue()) / (this.getMaxValue() - this.getMinValue()))
* (super.getHeight() - super.getAxisMarginBottom()));
// 绘制线条路径
if (j == displayFrom) {
areaPath.moveTo(startX, valueY1);
areaPath.lineTo(startX, valueY2);
areaPath.moveTo(startX, valueY1);
} else {
areaPath.lineTo(startX, valueY1);
areaPath.lineTo(startX, valueY2);
areaPath.lineTo(lastX, lastY);
areaPath.close();
areaPath.moveTo(startX, valueY1);
}
lastX = startX;
lastY = valueY2;
startX = startX + 1 + lineLength;
}
areaPath.close();
canvas.drawPath(areaPath, mPaint);
}
}
}
/**
* draw lines
*
* <p>ラインを書く
*
* <p>绘制线条
*
* @param canvas
*/
protected void drawBandBorder(Canvas canvas) {
// distance between two points
float lineLength = ((super.getWidth() - super.getAxisMarginLeft()) / displayNumber) - 1;
// start point‘s X
float startX;
// draw lines
for (int i = 0; i < bandData.size(); i++) {
LineEntity<DateValueEntity> line = (LineEntity<DateValueEntity>) bandData.get(i);
if (line.isDisplay()) {
Paint mPaint = new Paint();
mPaint.setColor(line.getLineColor());
mPaint.setAntiAlias(true);
List<DateValueEntity> lineData = line.getLineData();
// set start point’s X
startX = super.getAxisMarginLeft() + lineLength / 2f;
// start point
PointF ptFirst = null;
if (lineData != null) {
for (int j = displayFrom; j < displayFrom + displayNumber; j++) {
float value = lineData.get(j).getValue();
// calculate Y
float valueY =
(float)
((1f - (value - this.getMinValue()) / (this.getMaxValue() - this.getMinValue()))
* (super.getHeight() - super.getAxisMarginBottom()));
// if is not last point connect to previous point
if (j > displayFrom) {
canvas.drawLine(ptFirst.x, ptFirst.y, startX, valueY, mPaint);
}
// reset
ptFirst = new PointF(startX, valueY);
startX = startX + 1 + lineLength;
}
}
}
}
}