/usr/share/ncarg/hluex/basic/basic08c.c is in libncarg-data 6.4.0-9.
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* *
* Copyright (C) 1995 *
* University Corporation for Atmospheric Research *
* All Rights Reserved *
* *
******************************************************************************
*
* File: basic08c.c
* Author: David Brown (translated to C by David Younghans)
* National Center for Atmospheric Research
* PO 3000, Boulder, Colorado 80303
*
* Date: Wed September 20, 1995
*
* Description: This C program demonstrates how to draw
* a plot object including any annotations
* outside its viewport within a predefined
* bounded area of NDC space. The procedure
* draw_bounded_plot is intended to be useful in any
* context where it is desired to keep an entire plot
* within predetermined boundaries.
*
*/
#include <stdio.h>
#include <math.h>
#include <ncarg/hlu/App.h>
#include <ncarg/hlu/NcgmWorkstation.h>
#include <ncarg/hlu/PSWorkstation.h>
#include <ncarg/hlu/PDFWorkstation.h>
#include <ncarg/hlu/CairoWorkstation.h>
#include <ncarg/hlu/LogLinPlot.h>
#include <ncarg/hlu/ContourPlot.h>
void draw_bounded_plot();
/*
* Main program.
*/
int main()
{
int appid,rlist,grlist;
int wid,gid,ll_id,cn_id;
float x[5];
float y[5];
/*
* Set the display. Default is to display output to an X workstation.
*/
char const *wks_type = "x11";
/*
* Initialize the high level utility library and create application.
*/
NhlInitialize();
rlist = NhlRLCreate(NhlSETRL);
grlist = NhlRLCreate(NhlGETRL);
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNappUsrDir,"./");
NhlCreate(&appid,"basic08",NhlappClass,NhlDEFAULT_APP,rlist);
if (!strcmp(wks_type,"ncgm") || !strcmp(wks_type,"NCGM")) {
/*
* Create a metafile workstation with the default colormap.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkMetaName,"./basic08c.ncgm");
NhlCreate(&wid,"simple_ncgm",NhlncgmWorkstationClass,
NhlDEFAULT_APP,rlist);
}
if (!strcmp(wks_type,"x11") || !strcmp(wks_type,"X11")) {
/*
* Create an X workstation.
*/
NhlRLClear(rlist);
NhlRLSetInteger(rlist,NhlNwkPause,True);
NhlCreate(&wid,"simple_x11",NhlcairoWindowWorkstationClass,
NhlDEFAULT_APP,rlist);
}
if (!strcmp(wks_type,"oldps") || !strcmp(wks_type,"OLDPS")) {
/*
* Create an older-style PostScript workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkPSFileName,"./basic08c.ps");
NhlCreate(&wid,"simple_ps",NhlpsWorkstationClass,
NhlDEFAULT_APP,rlist);
}
if (!strcmp(wks_type,"oldpdf") || !strcmp(wks_type,"OLDPDF")) {
/*
* Create an older-style PDF workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkPDFFileName,"./basic08c.pdf");
NhlCreate(&wid,"simple_pdf",NhlpdfWorkstationClass,
NhlDEFAULT_APP,rlist);
}
if (!strcmp(wks_type,"pdf") || !strcmp(wks_type,"PDF") ||
!strcmp(wks_type,"ps") || !strcmp(wks_type,"PS")) {
/*
* Create a cairo PS/PDF workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkFileName,"./basic08c");
NhlRLSetString(rlist,NhlNwkFormat,(char*)wks_type);
NhlCreate(&wid,"simple_cairo",NhlcairoDocumentWorkstationClass,
NhlDEFAULT_APP,rlist);
}
if (!strcmp(wks_type,"png") || !strcmp(wks_type,"PNG")) {
/*
* Create a cairo PNG workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkFileName,"./basic08c");
NhlRLSetString(rlist,NhlNwkFormat,(char*)wks_type);
NhlCreate(&wid,"simple_cairo",NhlcairoImageWorkstationClass,
NhlDEFAULT_APP,rlist);
}
/*
* Create a LogLinPlot object with a viewport that fills the viewspace. This
* will be used for drawing immediate mode polylines indicating the intended
* boundary of each plot object.
*/
NhlRLClear(rlist);
NhlRLSetFloat(rlist,NhlNvpXF,0.0);
NhlRLSetFloat(rlist,NhlNvpYF,1.0);
NhlRLSetFloat(rlist,NhlNvpWidthF,1.0);
NhlRLSetFloat(rlist,NhlNvpHeightF,1.0);
NhlCreate(&ll_id,"loglin",NhllogLinPlotClass,wid,rlist);
/*
* Set GraphicStyle resources to modify the immediate mode line attributes.
*/
NhlRLClear(grlist);
NhlRLGetInteger(grlist,NhlNwkDefGraphicStyleId,&gid);
NhlGetValues(wid,grlist);
NhlRLClear(rlist);
NhlRLSetInteger(rlist,NhlNgsLineColor,2);
NhlRLSetInteger(rlist,NhlNgsLineDashPattern,1);
NhlSetValues(gid,rlist);
/*
* Create an empty ContourPlot object with a Title, a LabelBar, and a Legend.
* Note that the viewport is square and covers the whole NDC space,
* meaning that if the plot were drawn as created, all annotations exterior
* to the viewport would be outside the viewspace and therefore clipped.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNpmLabelBarDisplayMode,"always");
NhlRLSetString(rlist,NhlNpmLegendDisplayMode,"always");
NhlRLSetString(rlist,NhlNtiMainString,"bounded contour plot");
NhlRLSetFloat(rlist,NhlNvpXF,0.0);
NhlRLSetFloat(rlist,NhlNvpYF,1.0);
NhlRLSetFloat(rlist,NhlNvpHeightF,1.0);
NhlRLSetFloat(rlist,NhlNvpWidthF,1.0);
NhlCreate(&cn_id,"contour",NhlcontourPlotClass,wid,rlist);
/*
* The first frame illustrates drawing the plot with a 5% margin around
* the viewable area. Draw an immediate mode line indicating the boundary
* that defines the margin.
*/
x[0] = 0.05;
x[1] = 0.95;
x[2] = 0.95;
x[3] = 0.05;
x[4] = 0.05;
y[0] = 0.05;
y[1] = 0.05;
y[2] = 0.95;
y[3] = 0.95;
y[4] = 0.05;
NhlNDCPolyline(ll_id,gid,x,y,5);
/*
* Draw the plot with the desired boundary parameters.
*/
draw_bounded_plot(cn_id,1,0.05,0.95,0.05,0.95,rlist);
NhlFrame(wid);
/*
* The second frame illustrates use of the draw_bounded_plot procedure
* to place several plots with varying aspect ratios in a single frame.
*/
x[0] = 0.025;
x[1] = 0.475;
x[2] = 0.475;
x[3] = 0.025;
x[4] = 0.025;
y[0] = 0.525;
y[1] = 0.525;
y[2] = 0.975;
y[3] = 0.975;
y[4] = 0.525;
NhlNDCPolyline(ll_id,gid,x,y,5);
/*
* Set the ContourPlot viewport so that the width is twice the height.
* (The absolute numbers are not important here, only the ratio matters.)
*/
NhlRLClear(rlist);
NhlRLSetFloat(rlist,NhlNvpWidthF,0.6);
NhlRLSetFloat(rlist,NhlNvpHeightF,0.3);
NhlRLSetString(rlist,NhlNtiMainString,"width is limiting dimension");
NhlSetValues(cn_id,rlist);
/*
* Draw the plot with the desired boundary parameters.
*/
draw_bounded_plot(cn_id,1,0.025,0.475,0.525,0.975,rlist);
/*
* Draw an immediate mode line indicating the desired boundary of the
* second plot.
*/
x[0] = 0.525;
x[1] = 0.975;
x[2] = 0.975;
x[3] = 0.525;
x[4] = 0.525;
y[0] = 0.525;
y[1] = 0.525;
y[2] = 0.975;
y[3] = 0.975;
y[4] = 0.525;
NhlNDCPolyline(ll_id,gid,x,y,5);
/*
* Set the ContourPlot viewport so that the height is twice the width.
*/
NhlRLClear(rlist);
NhlRLSetFloat(rlist,NhlNvpWidthF,0.3);
NhlRLSetFloat(rlist,NhlNvpHeightF,0.6);
NhlRLSetString(rlist,NhlNtiMainString,"height is limiting dimension");
NhlSetValues(cn_id,rlist);
/*
* Draw the plot with the desired boundary parameters.
*/
draw_bounded_plot(cn_id,1,0.525,0.975,0.525,0.975,rlist);
/*
* Draw an immediate mode line indicating the desired boundary of the
* third plot.
*/
x[0] = 0.125;
x[1] = 0.875;
x[2] = 0.875;
x[3] = 0.125;
x[4] = 0.125;
y[0] = 0.1;
y[1] = 0.1;
y[2] = 0.4;
y[3] = 0.4;
y[4] = 0.1;
NhlNDCPolyline(ll_id,gid,x,y,5);
/*
* For this plot the aspect ratio is distored in order to fill as much as
* possible of the desired area. Note that the space is not completely filled.
* This is because a number of factors affecting the final aspect raio,
* such as the text size used for titles, are determined based on only
* one of the viewport's dimensions.
*/
NhlRLClear(rlist);
NhlRLSetFloat(rlist,NhlNvpHeightF,1.0);
NhlRLSetFloat(rlist,NhlNvpWidthF,1.0);
NhlRLSetString(rlist,NhlNtiMainString,"distort aspect ratio to fill area");
NhlSetValues(cn_id,rlist);
/*
* Draw the plot with the desired boundary parameters.
*/
draw_bounded_plot(cn_id,0,0.125,0.875,0.1,0.4,rlist);
NhlFrame(wid);
/*
* Clean up.
*/
NhlDestroy(wid);
NhlClose();
exit(0);
}
void draw_bounded_plot(id,keep_aspect,left,right,bottom,top,rlist)
int id,keep_aspect,rlist;
float left,right,bottom,top;
/*
* This procedure taked the plot object with identifier "id" and
* draws it within the NDC boundaries represented by left, right,
* top, and bottom. If keep_aspect is True, the aspect ratio of the plot
* is preserved: the plot fills the extent of the limiting dimension and
* is centered within the extent of the other dimension. If keep_aspect is
* False, the aspect ratio is distorted in order to fill as much of the
* space as possible, given certain limitations in the ability of some
* HLU objects to distort themselves to any arbitrary aspect ratio.
*/
{
int grlist;
float x_save,y_save,width_save,height_save,
bb_top,bb_bottom,bb_left,bb_right,bb_height,bb_width,
frame_height,frame_width,
factor,x_off,y_off,x,y,width,height;
struct _NhlBoundingBox box;
grlist = NhlRLCreate(NhlGETRL);
NhlRLClear(grlist);
NhlRLGetFloat(grlist,NhlNvpXF,&x_save);
NhlRLGetFloat(grlist,NhlNvpYF,&y_save);
NhlRLGetFloat(grlist,NhlNvpWidthF,&width_save);
NhlRLGetFloat(grlist,NhlNvpHeightF,&height_save);
NhlGetValues(id,grlist);
NhlGetBB(id,&box);
bb_top = box.t;
bb_bottom = box.b;
bb_left = box.l;
bb_right = box.r;
bb_height = bb_top - bb_bottom;
bb_width = bb_right - bb_left;
frame_height = top - bottom;
frame_width = right - left;
x = x_save;
y = y_save;
height = height_save;
width = width_save;
if (!keep_aspect)
{
factor = frame_width / bb_width;
width = width * factor;
x_off = (x - bb_left) * factor;
x = left + x_off;
factor = frame_height / bb_height;
height = height * factor;
y_off = (y - bb_top) * factor;
y = top + y_off;
NhlRLClear(rlist);
NhlRLSetFloat(rlist,NhlNvpXF,x);
NhlRLSetFloat(rlist,NhlNvpYF,y);
NhlRLSetFloat(rlist,NhlNvpWidthF,width);
NhlRLSetFloat(rlist,NhlNvpHeightF,height);
NhlSetValues(id,rlist);
NhlRLClear(grlist);
NhlRLGetFloat(grlist,NhlNvpXF,&x);
NhlRLGetFloat(grlist,NhlNvpYF,&y);
NhlRLGetFloat(grlist,NhlNvpWidthF,&width);
NhlRLGetFloat(grlist,NhlNvpHeightF,&height);
NhlGetValues(id,grlist);
NhlGetBB(id,&box);
bb_top = box.t;
bb_bottom = box.b;
bb_right = box.r;
bb_left = box.l;
bb_height = bb_top - bb_bottom;
bb_width = bb_right - bb_left;
}
if ((bb_height / bb_width) < (frame_height / frame_width))
/*
* Width is the limiting dimension.
*/
{
factor = frame_width / bb_width;
width = width * factor;
height = height * factor;
x_off = (x - bb_left) * factor;
y_off = (y - bb_top) * factor;
x = left + x_off;
bb_height = bb_height * factor;
y = top + y_off - 0.5 * (frame_height - bb_height);
}
else
/*
* Height is the limiting dimension.
*/
{
factor = frame_height / bb_height;
height = height * factor;
width = width * factor;
x_off = (x - bb_left) * factor;
y_off = (y - bb_top) * factor;
bb_width = bb_width * factor;
x = left + x_off + 0.5 * (frame_width - bb_width);
y = top + y_off;
}
NhlRLClear(rlist);
NhlRLSetFloat(rlist,NhlNvpXF,x);
NhlRLSetFloat(rlist,NhlNvpYF,y);
NhlRLSetFloat(rlist,NhlNvpWidthF,width);
NhlRLSetFloat(rlist,NhlNvpHeightF,height);
NhlSetValues(id,rlist);
NhlDraw(id);
NhlRLClear(rlist);
NhlRLSetFloat(rlist,NhlNvpXF,x_save);
NhlRLSetFloat(rlist,NhlNvpYF,y_save);
NhlRLSetFloat(rlist,NhlNvpWidthF,width_save);
NhlRLSetFloat(rlist,NhlNvpHeightF,height_save);
NhlSetValues(id,rlist);
}
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