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Code Issues 33 Projects Packages Wiki Activity Actions

.examples

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git-svn-id: svn://ultimatepp.org/upp/trunk@11697 f0d560ea-af0d-0410-9eb7-867de7ffcac7
This commit is contained in:
cxl 2018-01-16 00:20:25 +00:00
parent 28f61571eb
commit 91f16e9d4f
1 changed files with 25 additions and 14 deletions
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39
examples/FnGraph/main.cpp
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@ -116,7 +116,9 @@ double Evaluate(const char *s, double x)
struct FnGraph : public TopWindow {
virtual void Paint(Draw& w);
virtual void MouseWheel(Point p, int zdelta, dword keyflags);
int zoom = 9;
EditString expression; // function to display
void RefreshExpression() { Refresh(); }
@ -134,6 +136,12 @@ FnGraph::FnGraph()
Sizeable().Zoomable(); // make the window resizable
}
void FnGraph::MouseWheel(Point, int zdelta, dword keyflags)
{
zoom = clamp(zoom + -sgn(zdelta), 1, 20);
Refresh();
}
void FnGraph::Paint(Draw& w_)
{
Size sz = GetSize();
@ -145,7 +153,7 @@ void FnGraph::Paint(Draw& w_)
if(sz.cy < 1) // if too small, do nothing (avoid div by zero)
return;
sz = sz / 2 * 2 - 1; // this trick will force axes to .5, results in sharper AA rendering
double pixels_per_unit = sz.cy / 9; // we want to display y range -4.5 .. 4.5
double pixels_per_unit = sz.cy / zoom; // we want to display y range -4.5 .. 4.5
double xaxis = sz.cy / 2.0; // vertical position of x axis
double yaxis = sz.cx / 2.0; // horizontal position of y axis
w.Move(0, xaxis).Line(sz.cx, xaxis).Stroke(1, Blue()); // draw x axis
@ -165,20 +173,23 @@ void FnGraph::Paint(Draw& w_)
w.Move(yaxis - 5, y).Line(yaxis + 5, y).Stroke(1, Blue());
w.Text(int(yaxis + 6), int(y - tsz.cy / 2.0), n, font).Fill(Blue());
}
double y0 = Null; // store previous value
for(int i = 0; i < sz.cx; i++) { // now iterate through all x pointes and draw the graph
double x = (i - sz.cx / 2.0) / pixels_per_unit;
double y = Evaluate(~~expression, x);
if(!IsNull(y)) {
double gy = sz.cy / 2.0 - y * pixels_per_unit;
if(IsNull(y0)) // previous value was defined
w.Move(i, gy);
else
w.Line(i, gy);
Vector<String> xp = Split(~~expression, ';'); // get individual functions
for(int ii = 0; ii < xp.GetCount(); ii++) {
double y0 = Null; // store previous value
for(int i = 0; i < sz.cx; i++) { // now iterate through all x pointes and draw the graph
double x = (i - sz.cx / 2.0) / pixels_per_unit;
double y = Evaluate(xp[ii], x);
if(!IsNull(y)) {
double gy = sz.cy / 2.0 - y * pixels_per_unit;
if(IsNull(y0)) // previous value was defined
w.Move(i, gy);
else
w.Line(i, gy);
}
y0 = y;
}
y0 = y;
w.Stroke(1, Color(!!(ii & 1) * 150, !!(ii & 2) * 150, !!(ii & 4) * 150)); // finally paint the graph line
}
w.Stroke(1, Black()); // finally paint the graph line
}
GUI_APP_MAIN