// Draws 10,000 points inside the plot window.
// This is intended to demonstrate how to draw some points on top of a plot, not
// as the way to draw a plot. The 'plot' data series of functions are intended
// for drawing plots.
func randomDraw(plot *DataVisual.PlotWindow) {
var pixelPoints [10000]image.Point
for {
// Get the current UI window width/height.
// Note that this is *not* the width/height of the plot.
// we do this outside the loop since getting the width and height
// of the ui window is a relatively slow process.
width := plot.WindowWidth()
height := plot.WindowHeight()
// Set 10,000 random points
for index, _ := range pixelPoints {
pixelPoints[index].X = rand.Intn(width)
pixelPoints[index].Y = rand.Intn(height)
}
// pick a draw color for the 10,000 points.
color := color.RGBA{
R: uint8(rand.Intn(256)),
G: uint8(rand.Intn(256)),
B: uint8(rand.Intn(256)),
A: 0xff,
}
// draw all 10,000 points.
plot.DrawPoints(pixelPoints[:], color)
}
}
// Draws a single point at a time inside the plot window.
// This is intended to demonstrate how to draw individual points on top of a
// plot, not as the way to draw a plot. The 'plot' data series of functions are
// intended for drawing plots.
func randomDraw(plot *DataVisual.PlotWindow) {
for {
// Get the current UI window width/height.
// Note that this is *not* the width/height of the plot.
// we do this outside the loop since getting the width and height
// of the ui window is a relatively slow process. Getting the
// width/height every 10 points is reasonable.
width := plot.WindowWidth()
height := plot.WindowHeight()
// draw 10 points.
for index := 0; index < 10; index++ {
// pick a draw color for the 10,000 points.
color := color.RGBA{
R: uint8(rand.Intn(256)),
G: uint8(rand.Intn(256)),
B: uint8(rand.Intn(256)),
A: 0xff,
}
plot.DrawPoint(rand.Intn(width), rand.Intn(height), color)
}
}
}
