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Only draw the parts of LineChart that need to be drawn.

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This commit is contained in:
Natalia Portillo
2019-04-22 02:07:05 +01:00
parent 51fa3767e4
commit 928ba6726e
1 changed files with 79 additions and 36 deletions
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115
DiscImageChef.Gui/Controls/LineChart.cs
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@@ -10,25 +10,29 @@ namespace DiscImageChef.Gui.Controls
/// </summary>
public class LineChart : Drawable
{
bool absoluteMargins;
Color axesColor;
Color backgroundColor;
Color colorX;
Color colorY;
bool drawAxes;
Color lineColor;
float marginX;
float marginY;
float maxX;
float maxY;
float minX;
float minY;
float ratioX;
float ratioY;
bool showStepsX;
bool showStepsY;
float stepsX;
float stepsY;
bool absoluteMargins;
Color axesColor;
Color backgroundColor;
Color colorX;
Color colorY;
bool drawAxes;
Color lineColor;
float marginX;
float marginXrated;
float marginY;
float marginYrated;
float maxX;
float maxY;
float minX;
float minY;
PointF previousPoint;
float ratioX;
float ratioY;
RectangleF rect;
bool showStepsX;
bool showStepsY;
float stepsX;
float stepsY;
public LineChart()
{
@@ -51,6 +55,7 @@ namespace DiscImageChef.Gui.Controls
marginX = 5;
marginY = 5;
absoluteMargins = true;
previousPoint = new PointF(0, 0);
}
/// <summary>
@@ -299,45 +304,83 @@ namespace DiscImageChef.Gui.Controls
void OnValuesChanged(object sender, NotifyCollectionChangedEventArgs args)
{
Invalidate();
// If we do not support to drawn on the graphics we will need to redraw it, slowly
if(!SupportsCreateGraphics) Invalidate();
Graphics g;
// If the control is not visible (hidden in another tab) this raises an exception
try { g = CreateGraphics(); }
catch { return; }
switch(args.Action)
{
// Draw only next point
case NotifyCollectionChangedAction.Add:
foreach(object item in args.NewItems)
{
if(!(item is PointF nextPoint)) continue;
float prevXrated = previousPoint.X * ratioX;
float prevYrated = previousPoint.Y * ratioY;
float nextXrated = nextPoint.X * ratioX;
float nextYrated = nextPoint.Y * ratioY;
g.DrawLine(lineColor, marginXrated + prevXrated, rect.Height - marginYrated - prevYrated,
marginXrated + nextXrated, rect.Height - marginYrated - nextYrated);
previousPoint = nextPoint;
}
break;
// Need to redraw all points
default:
Invalidate();
break;
}
g.Dispose();
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
Graphics g = e.Graphics;
RectangleF r = e.ClipRectangle;
Graphics g = e.Graphics;
rect = e.ClipRectangle;
g.FillRectangle(backgroundColor, r);
g.FillRectangle(backgroundColor, rect);
ratioX = r.Width / (maxX - minX);
ratioY = r.Height / (maxY - minY);
ratioX = rect.Width / (maxX - minX);
ratioY = rect.Height / (maxY - minY);
float marginXrated = marginX * (absoluteMargins ? 1 : ratioX);
float marginYrated = marginY * (absoluteMargins ? 1 : ratioY);
marginXrated = marginX * (absoluteMargins ? 1 : ratioX);
marginYrated = marginY * (absoluteMargins ? 1 : ratioY);
if(drawAxes)
{
g.DrawLine(axesColor, marginXrated, 0, marginXrated, r.Height);
g.DrawLine(axesColor, 0, r.Height - marginYrated, r.Width, r.Height - marginYrated);
g.DrawLine(axesColor, marginXrated, 0, marginXrated, rect.Height);
g.DrawLine(axesColor, 0, rect.Height - marginYrated, rect.Width,
rect.Height - marginYrated);
}
if(showStepsX)
{
float stepsXraged = stepsX * ratioX;
for(float x = marginXrated + stepsXraged; x < r.Width; x += stepsXraged)
g.DrawLine(colorX, x, 0, x, r.Height - marginYrated - 1);
for(float x = marginXrated + stepsXraged; x < rect.Width;
x += stepsXraged)
g.DrawLine(colorX, x, 0, x, rect.Height - marginYrated - 1);
}
if(showStepsY)
{
float stepsYraged = stepsY * ratioY;
for(float y = r.Height - marginYrated - stepsYraged; y > 0; y -= stepsYraged)
g.DrawLine(colorY, marginXrated + 1, y, r.Width, y);
for(float y = rect.Height - marginYrated - stepsYraged; y > 0; y -= stepsYraged)
g.DrawLine(colorY, marginXrated + 1, y, rect.Width, y);
}
PointF previousPoint = new PointF(0, 0);
previousPoint = new PointF(0, 0);
foreach(Point nextPoint in Values)
{
float prevXrated = previousPoint.X * ratioX;
@@ -346,8 +389,8 @@ namespace DiscImageChef.Gui.Controls
float nextXrated = nextPoint.X * ratioX;
float nextYrated = nextPoint.Y * ratioY;
g.DrawLine(lineColor, marginXrated + prevXrated, r.Height - marginYrated - prevYrated,
marginXrated + nextXrated, r.Height - marginYrated - nextYrated);
g.DrawLine(lineColor, marginXrated + prevXrated, rect.Height - marginYrated - prevYrated,
marginXrated + nextXrated, rect.Height - marginYrated - nextYrated);
previousPoint = nextPoint;
}