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Slightly prettier Pie Chart

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This commit is contained in:
Mark Watkins 2011-06-29 01:30:43 +10:00
parent 7ea08fe0a1
commit 6f0d0cc6f2
1 changed files with 10 additions and 9 deletions
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19
Graphs/gpiechart.cpp
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@ -23,7 +23,7 @@ void gPieChart::Plot(gGraphWindow & w,float scrx,float scry)
int height=scry-(w.GetTopMargin()+w.GetBottomMargin());
float diameter=MIN(width,height);
diameter-=4;
diameter-=8;
float radius=diameter/2.0;
double total=0;
@ -38,11 +38,12 @@ void gPieChart::Plot(gGraphWindow & w,float scrx,float scry)
//glEnable(GL_TEXTURE_2D);
//glEnable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glEnable(GL_POLYGON_SMOOTH);
//glEnable(GL_POLYGON_SMOOTH);
glEnable(GL_LINE_SMOOTH);
glLineWidth(1);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
//glBlendFunc( GL_SRC_ALPHA_SATURATE, GL_ONE );
glHint(GL_POLYGON_SMOOTH_HINT, GL_NICEST);
//glHint(GL_POLYGON_SMOOTH_HINT, GL_NICEST);
for (int i=0;i<data->np[0];i++) {
j=(data->point[0][i].y()/total); // ratio of this pie slice
@ -50,11 +51,11 @@ void gPieChart::Plot(gGraphWindow & w,float scrx,float scry)
w.qglColor(col1);
glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
glBegin(GL_POLYGON);
glVertex2f(start_px+radius+2, start_py+radius+2);
glVertex2f(start_px+radius+4, start_py+radius+4);
for (double q=sum;q<sum+j;q+=step) {
px=start_px+radius+sin(q*2*M_PI)*radius;
py=start_py+radius+cos(q*2*M_PI)*radius;
px=start_px+radius+4+sin(q*2*M_PI)*radius;
py=start_py+radius+4+cos(q*2*M_PI)*radius;
glVertex2f(px,py);
}
glEnd();
@ -62,10 +63,10 @@ void gPieChart::Plot(gGraphWindow & w,float scrx,float scry)
glPolygonMode(GL_BACK,GL_LINE);
w.qglColor(Qt::black);
glBegin(GL_POLYGON);
glVertex2f(start_px+radius+2, start_py+radius+2);
glVertex2f(start_px+radius+4, start_py+radius+4);
for (double q=sum;q<sum+j;q+=step) {
px=start_px+radius+sin(q*2*M_PI)*radius;
py=start_py+radius+cos(q*2*M_PI)*radius;
px=start_px+radius+4+sin(q*2*M_PI)*radius;
py=start_py+radius+4+cos(q*2*M_PI)*radius;
glVertex2f(px,py);
}
glEnd();