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include <mach.h>
include <gset.h>
include <gio.h>
define MSIZE 2.0
# GT_DELPT -- Mark a point as deleted
procedure gt_delpt (gd, wx, wy, x, y, npix, deleted, undelete)
pointer gd # Graphics descriptor
real wx # Cursor position
real wy # ""
real x[ARB] # Plotted data
real y[ARB] # Plotted data
int npix # # of pixels
int deleted[ARB] # Array of delete indicators
int undelete # Undelete flag
int row, i
real r2min, r2, x0, y0
begin
# Search for the nearest point which has not been deleted
row = 0
r2min = MAX_REAL
# Transform world cursor coordintes to NDC
call gctran (gd, wx, wy, wx, wy, 1, 0)
do i = 1 , npix {
if ((deleted[i] == YES && undelete == NO) ||
(deleted[i] == NO && undelete == YES))
next
call gctran (gd, x[i], y[i], x0, y0, 1, 0)
if (x[i] < INDEFR && y[i] < INDEFR)
r2 = (wx - x0) ** 2 + (wy - y0) ** 2
else
r2 = MAX_REAL
if (r2 < r2min) {
r2min = r2
row = i
}
}
if (row != 0) {
# Mark row as being deleted
if (undelete == NO) {
# Plot X over point
call gscur (gd, x[row], y[row])
call gseti (gd, G_PMLTYPE, GL_SOLID)
call gmark (gd, x[row], y[row], GM_CROSS, MSIZE, MSIZE)
deleted[row] = YES
} else {
deleted[row] = NO
call gscur (gd, x[row], y[row])
call gseti (gd, G_PMLTYPE, GL_CLEAR)
call gmark (gd, x[row], y[row], GM_CROSS, MSIZE, MSIZE)
}
}
end
# GT_DYGT -- Delete all point > input Y
procedure gt_dygt (gd, wy, x, y, npix, deleted, undelete)
pointer gd # Graphics descriptor
real wy # Cursor position
real x[ARB] # Plotted data
real y[ARB] # Plotted data
int npix # # of pixels
int deleted[ARB] # Array of delete indicators
int undelete
int i
begin
# Search for points with Y values > than the critical value
do i = 1 , npix {
if ((deleted[i] == YES && undelete == NO) ||
(deleted[i] == NO && undelete == YES))
next
if (y[i] > wy) {
if (undelete == NO) {
# Plot X over point
call gseti (gd, G_PMLTYPE, GL_SOLID)
call gmark (gd, x[i], y[i], GM_CROSS, MSIZE, MSIZE)
deleted[i] = YES
} else {
deleted[i] = NO
call gseti (gd, G_PMLTYPE, GL_CLEAR)
call gmark (gd, x[i], y[i], GM_CROSS, MSIZE, MSIZE)
}
}
}
end
# GT_DYLT -- Delete all point < input Y
procedure gt_dylt (gd, wy, x, y, npix, deleted, undelete)
pointer gd # Graphics descriptor
real wy # Cursor position
real x[ARB] # Plotted data
real y[ARB] # Plotted data
int npix # # of pixels
int deleted[ARB] # Array of delete indicators
int undelete
int i
begin
# Search for points with Y values > than the critical value
do i = 1 , npix {
if ((deleted[i] == YES && undelete == NO) ||
(deleted[i] == NO && undelete == YES))
next
if (y[i] < wy) {
if (undelete == NO) {
deleted[i] = YES
# Plot X over point
call gseti (gd, G_PMLTYPE, GL_SOLID)
call gmark (gd, x[i], y[i], GM_CROSS, MSIZE, MSIZE)
} else {
deleted[i] = NO
call gseti (gd, G_PMLTYPE, GL_CLEAR)
call gmark (gd, x[i], y[i], GM_CROSS, MSIZE, MSIZE)
}
}
}
end
# GT_DXGT -- Delete all point > input X
procedure gt_dxgt (gd, wx, x, y, npix, deleted, undelete)
pointer gd # Graphics descriptor
real wx # Cursor position
real x[ARB] # Plotted data
real y[ARB] # Plotted data
int npix # # of pixels
int deleted[ARB] # Array of delete indicators
int undelete
int i
begin
# Search for points with X values > than the critical value
do i = 1 , npix {
if ((deleted[i] == YES && undelete == NO) ||
(deleted[i] == NO && undelete == YES))
next
if (x[i] > wx) {
if (undelete == NO) {
deleted[i] = YES
# Plot X over point
call gseti (gd, G_PMLTYPE, GL_SOLID)
call gmark (gd, x[i], y[i], GM_CROSS, MSIZE, MSIZE)
} else {
deleted[i] = NO
call gseti (gd, G_PMLTYPE, GL_CLEAR)
call gmark (gd, x[i], y[i], GM_CROSS, MSIZE, MSIZE)
}
}
}
end
# GT_DXLT -- Delete all point > input Y
procedure gt_dxlt (gd, wx, x, y, npix, deleted, undelete)
pointer gd # Graphics descriptor
real wx # Cursor position
real x[ARB] # Plotted data
real y[ARB] # Plotted data
int npix # # of pixels
int deleted[ARB] # Array of delete indicators
int undelete
int i
begin
# Search for points with X values < than the critical value
do i = 1 , npix {
if ((deleted[i] == YES && undelete == NO) ||
(deleted[i] == NO && undelete == YES))
next
if (x[i] < wx) {
if (undelete == NO) {
deleted[i] = YES
# Plot X over point
call gseti (gd, G_PMLTYPE, GL_SOLID)
call gmark (gd, x[i], y[i], GM_CROSS, MSIZE, MSIZE)
} else {
deleted[i] = NO
call gseti (gd, G_PMLTYPE, GL_CLEAR)
call gmark (gd, x[i], y[i], GM_CROSS, MSIZE, MSIZE)
}
}
}
end
# GT_DBOX -- Delete all point in a box
procedure gt_dbox (gd, npix, deleted, undelete, x, y, x1, y1, x2, y2)
pointer gd # Graphics descriptor
int npix # # of pixels
int deleted[ARB] # Array of delete indicators
int undelete
real x[ARB] # Plotted data
real y[ARB] # Plotted data
real x1, y1, x2, y2 # Corners of the box
int i
real temp
begin
# Make sure the points are in the correct order
if (y2 < y1) {
temp = y1
y1 = y2
y2 = temp
}
if (x2 < x1) {
temp = x1
x1 = x2
x2 = temp
}
# Search for points within the box
do i = 1 , npix {
if ((deleted[i] == YES && undelete == NO) ||
(deleted[i] == NO && undelete == YES))
next
if (x[i] <= x2 && x[i] >= x1) {
if (y[i] <= y2 && y[i] >= y1) {
if (undelete == NO) {
deleted[i] = YES
# Plot X over point
call gseti (gd, G_PMLTYPE, GL_SOLID)
call gmark (gd, x[i], y[i], GM_CROSS, MSIZE, MSIZE)
} else {
deleted[i] = NO
call gseti (gd, G_PMLTYPE, GL_CLEAR)
call gmark (gd, x[i], y[i], GM_CROSS, MSIZE, MSIZE)
}
}
}
}
end
# GT_DSEG -- Delete all point on one side of a line segment
procedure gt_dseg (gd, npix, deleted, undelete, x, y, x1, y1, x2, y2, x0, y0)
pointer gd # Graphics descriptor
int npix # # of pixels
int deleted[ARB] # Array of delete indicators
int undelete
real x[ARB] # Plotted data
real y[ARB] # Plotted data
real x1, y1, x2, y2 # Corners of the box
real x0, y0, slope, inter, temp
int i, lessthan
begin
# Make sure the points are in the correct order
if (y2 < y1) {
temp = y1
y1 = y2
y2 = temp
}
if (x2 < x1) {
temp = x1
x1 = x2
x2 = temp
}
# Calculate slope and intercept
slope = (y2 - y1) / (x2 - x1)
inter = (x2 * y1 - x1 * y2) / (x2 - x1)
# Which side should we delete the lines from?
temp = x0 * slope + inter
if (temp <= y0)
lessthan = NO
else
lessthan = YES
# Search for points with X values between x1 and x2
do i = 1 , npix {
if ((deleted[i] == YES && undelete == NO) ||
(deleted[i] == NO && undelete == YES))
next
if (x[i] <= x2 && x[i] >= x1) {
# Now which side of the line does this point fall on
temp = x[i] * slope + inter
if (y[i] < temp && lessthan == YES) {
if (undelete == NO) {
deleted[i] = YES
# Plot X over point
call gseti (gd, G_PMLTYPE, GL_SOLID)
call gmark (gd, x[i], y[i], GM_CROSS, MSIZE, MSIZE)
} else {
deleted[i] = NO
call gseti (gd, G_PMLTYPE, GL_CLEAR)
call gmark (gd, x[i], y[i], GM_CROSS, MSIZE, MSIZE)
}
} else if (y[i] > temp && lessthan == NO) {
if (undelete == NO) {
deleted[i] = YES
# Plot X over point
call gseti (gd, G_PMLTYPE, GL_SOLID)
call gmark (gd, x[i], y[i], GM_CROSS, MSIZE, MSIZE)
} else {
deleted[i] = NO
call gseti (gd, G_PMLTYPE, GL_CLEAR)
call gmark (gd, x[i], y[i], GM_CROSS, MSIZE, MSIZE)
}
}
}
}
end
# GT_PDEL -- Overplot crosses on those points which have been marked for zap.
procedure gt_pdel (gd, x, y, deleted, npix)
pointer gd
real x[ARB]
real y[ARB]
int deleted[ARB]
int npix
int i
begin
do i = 1, npix {
if (deleted[i] == YES) {
# Plot X over point
call gseti (gd, G_PMLTYPE, GL_SOLID)
call gmark (gd, x[i], y[i], GM_CROSS, MSIZE, MSIZE)
}
}
end
|
