/**
* * Draw the horizontal and vertical distance tape
*
* @param canvas what to draw upon
* @param scale object for zoom determinations
* @param pixPerUnit how many pixels per mile/km/nm
* @param homeX horizontal position of current location on display
* @param homeY vertical position of current location on display
* @param top the usable top of the display
* @param width of the display
* @param height of the display
*/
@SuppressLint("DefaultLocale")
public void draw(
Canvas canvas,
Scale scale,
float pixPerUnit,
int homeX,
int homeY,
int top,
int width,
int height) {
// Set color and transparency for the shadow
mPaint.setColor(Color.BLACK); // shadow color is black
mPaint.setAlpha(0x7F); // Make it see-thru
// the vertical shadow down the left of the display
mPaint.setStrokeWidth(mBgndWidth); // Line width
canvas.drawLine(mBgndWidth / 2, top, mBgndWidth / 2, height, mPaint);
// the horizontal shadow along the top of the display under the display rows
mPaint.setStrokeWidth(mBgndHeight);
canvas.drawLine(mBgndWidth - 1, top + mBgndHeight / 2, width, top + mBgndHeight / 2, mPaint);
// The interval values for the scale indicator
double step = scale.getStep();
// text is white in color
mPaint.setColor(Color.WHITE);
// the horizontal values use posX and posY
int posX = homeX - (mTextWidth / 2);
int posY = top + mBotmMargin;
// Display the tape values for 20 distances
for (int idx = 0; idx < 21; idx++) {
// The current range. Make its label. Calc its display offset
double inc = idx * step;
String strLabel = String.format(inc < 10 ? "%1.1f" : "%.0f", inc);
float offset = (float) step * idx * pixPerUnit;
// vertical tape on the left side. Show if on the screen
if (inRangeY(homeY - offset, posY, height))
canvas.drawText(strLabel, mLeftMargin, homeY - offset, mPaint);
if (inRangeY(homeY + offset, posY, height))
canvas.drawText(strLabel, mLeftMargin, homeY + offset, mPaint);
// Horizontal tape on the top edge. Show if on the screen
if (inRangeX(posX - offset, mBgndWidth, width))
canvas.drawText(strLabel, posX - offset, posY, mPaint);
if (inRangeX(posX + offset, mBgndWidth, width))
canvas.drawText(strLabel, posX + offset, posY, mPaint);
}
return;
}
