public final void update() {
isVisible = geo.isEuclidianVisible();
if (isVisible) {
if (!geo.getDrawAlgorithm().equals(geo.getParentAlgorithm())) init();
int slopeTriangleSize = slope.getSlopeTriangleSize();
double rwHeight = slope.getValue() * slopeTriangleSize;
double height = view.yscale * rwHeight;
if (Math.abs(height) > Float.MAX_VALUE) {
isVisible = false;
return;
}
// get point on line g
g.getInhomPointOnLine(coords);
if (g.getStartPoint() == null) {
// get point on y-axis and line g
coords[0] = 0.0d;
coords[1] = -g.z / g.y;
}
view.toScreenCoords(coords);
// draw slope triangle
double x = coords[0];
double y = coords[1];
double xright = x + view.xscale * slopeTriangleSize;
if (gp == null) gp = new GeneralPathClipped(view);
gp.reset();
gp.moveTo(x, y);
gp.lineTo(xright, y);
gp.lineTo(xright, y - height);
// gp on screen?
if (!gp.intersects(0, 0, view.width, view.height)) {
isVisible = false;
// don't return here to make sure that getBounds() works for offscreen points too
}
// label position
labelVisible = geo.isLabelVisible();
if (labelVisible) {
if (slopeTriangleSize > 1) {
StringBuilder sb = new StringBuilder();
switch (slope.getLabelMode()) {
case GeoElement.LABEL_NAME_VALUE:
sb.append(slopeTriangleSize);
sb.append(' ');
sb.append(geo.getLabel());
sb.append(" = ");
sb.append(kernel.format(rwHeight));
break;
case GeoElement.LABEL_VALUE:
sb.append(kernel.format(rwHeight));
break;
default: // case GeoElement.LABEL_NAME:
sb.append(slopeTriangleSize);
sb.append(' ');
sb.append(geo.getLabel());
break;
}
labelDesc = sb.toString();
} else {
labelDesc = geo.getLabelDescription();
}
yLabel = (int) (y - height / 2.0f + 6);
xLabel = (int) (xright) + 5;
addLabelOffset();
// position off horizontal label (i.e. slopeTriangleSize)
xLabelHor = (int) ((x + xright) / 2.0);
yLabelHor = (int) (y + view.fontSize + 2);
StringBuilder sb = new StringBuilder();
sb.append(slopeTriangleSize);
horLabel = sb.toString();
}
updateStrokes(slope);
}
}
public final boolean hit(int x, int y) {
return gp != null && (gp.contains(x, y) || gp.intersects(x - 3, y - 3, 6, 6));
}