private void enableShadows(double thickness, PlotMode mode) {
if (mode == PlotMode.LINE) {
canvas.setShadow("#666", (int) thickness, 0, (int) Math.ceil(thickness / 2.0));
} else if (mode == PlotMode.BAR) {
canvas.setShadow("#666", 2, 2, 2);
}
}
/**
* Plots the line caps on the graph
*
* @param xCoordinates The x-coordinates of the caps
* @param yCoordinates The y-coordinates of the caps
*/
private void plotLineCaps(
List<Float> xCoordinates, List<Float> yCoordinates, double lineThickness) {
canvas.setStrokeStyle(canvas.getBackgroundColor());
canvas.setFillStyle(color);
canvas.beginPath();
Float x, y;
for (int i = 1; i < xCoordinates.size(); i++) {
x = xCoordinates.get(i);
y = yCoordinates.get(i);
canvas.moveTo(x, y);
canvas.arc(x, y, lineThickness, 0, 2 * Math.PI, false);
}
canvas.closePath();
canvas.stroke();
canvas.fill();
}
/**
* Plots a scatter graph
*
* @param xCoordinates The x-coordinates
* @param yCoordinates THe y-coordinates
*/
private void plotScatterGraph(List<Float> xCoordinates, List<Float> yCoordinates) {
canvas.setStrokeStyle(color);
canvas.setFillStyle(fillColor);
canvas.beginPath();
float x = xCoordinates.get(0);
float y = yCoordinates.get(0);
canvas.moveTo(x, y);
canvas.strokeRect(x, y, 2, 2);
canvas.moveTo(x, y);
for (int i = 1; i < xCoordinates.size(); i++) {
x = xCoordinates.get(i);
y = yCoordinates.get(i);
canvas.moveTo(x, y);
canvas.strokeRect(x, y, 2, 2);
canvas.moveTo(x, y);
}
canvas.moveTo(x, zero);
x = xCoordinates.get(0);
canvas.moveTo(x, zero);
canvas.closePath();
canvas.stroke();
canvas.fill();
}
private void disableShadows() {
canvas.setShadow(null, 0, 0, 0);
}
/**
* Plots a line graph
*
* @param xCoordinates The x-coordinates
* @param yCoordinates The y-coordinates
*/
private void plotLineGraph(
List<Float> xCoordinates, List<Float> yCoordinates, boolean lineCaps, double lineThickness) {
canvas.setLineWidth(lineThickness);
canvas.setLineJoin("round");
// First draw the filling
canvas.setStrokeStyle("rgba(0,0,0,255)");
canvas.setFillStyle(fillColor);
canvas.beginPath();
float x = xCoordinates.get(0);
float y = yCoordinates.get(0);
canvas.moveTo(x, zero);
canvas.lineTo(x, y);
for (int i = 1; i < xCoordinates.size(); i++) {
x = xCoordinates.get(i);
y = yCoordinates.get(i);
canvas.lineTo(x, y);
}
canvas.lineTo(x, zero);
x = xCoordinates.get(0);
canvas.moveTo(x, zero);
canvas.closePath();
canvas.fill();
if (useShadows) {
enableShadows(lineThickness, PlotMode.LINE);
}
// Then draw the outline
if (lineCaps) {
canvas.setLineJoin(Canvas.BEVEL);
}
canvas.setStrokeStyle(color);
canvas.beginPath();
x = xCoordinates.get(0);
y = yCoordinates.get(0);
canvas.moveTo(x, zero);
canvas.moveTo(x, y);
for (int i = 1; i < xCoordinates.size(); i++) {
x = xCoordinates.get(i);
y = yCoordinates.get(i);
canvas.lineTo(x, y);
}
if (BrowserInfo.get().isIE8() || BrowserInfo.get().isChrome()) {
/*
* In IE we have to draw a line down to zero so the path can get
* closed. If we don't then then there will be a line through the
* whole graph due to the VML implementation. After we move we also
* have to draw a 1px line, else IE will not draw anything when
* stroke width > 1.5px. IE 9-> uses canvas implementation where
* this problem does not exist
*
* Apparently Chrome 18-> joined the club :(
*/
canvas.moveTo(xCoordinates.get(0), yCoordinates.get(0));
canvas.lineTo(xCoordinates.get(0) + 1, yCoordinates.get(0));
} else {
canvas.moveTo(xCoordinates.get(0), zero);
}
canvas.closePath();
canvas.stroke();
// Finally, if we have any linecaps then draw them
if (lineCaps) {
plotLineCaps(xCoordinates, yCoordinates, lineThickness);
}
}
/**
* Constructor
*
* @param canvas The canvas to plot on
*/
public VCanvasPlotter(Canvas canvas) {
this.canvas = canvas;
zero = (float) canvas.getHeight();
}