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-rw-r--r--Examples/GIFPlot/Lib/plot2d.c445
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diff --git a/Examples/GIFPlot/Lib/plot2d.c b/Examples/GIFPlot/Lib/plot2d.c
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--- a/Examples/GIFPlot/Lib/plot2d.c
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-/* -----------------------------------------------------------------------------
- * plot2d.c
- *
- * 2-Dimensional plotting
- *
- * Author(s) : David Beazley (beazley@cs.uchicago.edu)
- * Copyright (C) 1995-1996
- *
- * See the file LICENSE for information on usage and redistribution.
- * ----------------------------------------------------------------------------- */
-
-#define PLOT2D
-
-#include "gifplot.h"
-
-/* ------------------------------------------------------------------------
- Plot2D *new_Plot2D(FrameBuffer *frame, xmin, ymin, xmax, ymax)
-
- Create a new 2D plot with given minimum and maximum coordinates.
- ------------------------------------------------------------------------ */
-Plot2D *new_Plot2D(FrameBuffer *frame,double xmin,double ymin,double xmax,double ymax) {
- Plot2D *p2;
- if (frame) {
- if (xmax <= xmin) return (Plot2D *) 0;
- if (ymax <= ymin) return (Plot2D *) 0;
- p2 = (Plot2D *) malloc(sizeof(Plot2D));
- p2->frame = frame;
- p2->xmin = xmin;
- p2->ymin = ymin;
- p2->xmax = xmax;
- p2->ymax = ymax;
- p2->view_xmin = 0;
- p2->view_xmax = frame->width;
- p2->view_ymin = 0;
- p2->view_ymax = frame->height;
- p2->xscale = LINEAR;
- p2->yscale = LINEAR;
- p2->dx = (p2->view_xmax - p2->view_xmin)/(p2->xmax - p2->xmin);
- p2->dy = (p2->view_ymax - p2->view_ymin)/(p2->ymax - p2->ymin);
- return p2;
- }
- return (Plot2D *) 0;
-}
-
-/* ----------------------------------------------------------------------------
- delete_Plot2D(Plot2D *p2)
-
- Delete a 2D plot
- ---------------------------------------------------------------------------- */
-void
-delete_Plot2D(Plot2D *p2) {
- if (p2)
- free((char *) p2);
-}
-
-/* -----------------------------------------------------------------------------
- Plot2D *Plot2D_copy(Plot2D *p2)
-
- Makes a copy of the Plot2D data structure.
- ----------------------------------------------------------------------------- */
-
-Plot2D *Plot2D_copy(Plot2D *p2) {
- Plot2D *c2;
- if (p2) {
- c2 = (Plot2D *) malloc(sizeof(Plot2D));
- if (c2) {
- c2->frame = p2->frame;
- c2->view_xmin = p2->view_xmin;
- c2->view_ymin = p2->view_ymin;
- c2->view_xmax = p2->view_xmax;
- c2->view_ymax = p2->view_ymax;
- c2->xmin = p2->xmin;
- c2->ymin = p2->ymin;
- c2->xmax = p2->xmax;
- c2->ymax = p2->ymax;
- c2->xscale = p2->xscale;
- c2->yscale = p2->yscale;
- c2->dx = p2->dx;
- c2->dy = p2->dy;
- }
- return c2;
- } else {
- return (Plot2D *) 0;
- }
-}
-
-/* -----------------------------------------------------------------------------
- Plot2D_clear(Plot2D *p2, Pixel c)
-
- Clear the region assigned to this plot to the given color.
- -------------------------------------------------------------------------- */
-
-void Plot2D_clear(Plot2D *p2, Pixel c) {
- int i,j;
- for (i = p2->view_xmin; i < p2->view_xmax; i++)
- for (j = p2->view_ymin; j < p2->view_ymax; j++) {
- p2->frame->pixels[j][i] = c;
- }
-}
-
-/* ------------------------------------------------------------------------------
- Plot2D_setview
-
- Sets the plot region on the framebuffer
- ------------------------------------------------------------------------------ */
-
-void
-Plot2D_setview(Plot2D *p2, int vxmin, int vymin, int vxmax, int vymax) {
- if (p2) {
- p2->view_xmin = vxmin;
- p2->view_ymin = vymin;
- p2->view_xmax = vxmax;
- p2->view_ymax = vymax;
- p2->dx = (p2->view_xmax - p2->view_xmin)/(p2->xmax - p2->xmin);
- p2->dy = (p2->view_ymax - p2->view_ymin)/(p2->ymax - p2->ymin);
- FrameBuffer_setclip(p2->frame,vxmin,vymin,vxmax,vymax);
- }
-}
-
-/* -------------------------------------------------------------------------------
- Plot2D_setrange(Plot2D *p2, double xmin, double ymin, double xmax, double ymax)
-
- Sets the plotting range.
- ------------------------------------------------------------------------------- */
-
-void
-Plot2D_setrange(Plot2D *p2, double xmin, double ymin, double xmax, double ymax) {
- if (p2) {
- p2->xmin = xmin;
- p2->ymin = ymin;
- p2->xmax = xmax;
- p2->ymax = ymax;
- p2->dx = (p2->view_xmax - p2->view_xmin)/(p2->xmax - p2->xmin);
- p2->dy = (p2->view_ymax - p2->view_ymin)/(p2->ymax - p2->ymin);
- }
-}
-
-/* -------------------------------------------------------------------------------
- Plot2D_setscale(Plot2D *p2, int xscale, int yscale)
-
- Sets the plotting scaling method
- ------------------------------------------------------------------------------- */
-
-void
-Plot2D_setscale(Plot2D *p2, int xscale, int yscale) {
- if (p2) {
- p2->xscale = xscale;
- p2->yscale = yscale;
- }
-}
-
-/* ----------------------------------------------------------------------------
- Plot2D_transform(Plot2D *p2, double x, double y, int *px, int *py)
-
- Transforms x,y into screen coordinates px and py. Result is returned
- in px and py. Rounds to the nearest pixel instead of truncating.
- ----------------------------------------------------------------------------- */
-
-void
-Plot2D_transform(Plot2D *p2, double x, double y, int *px, int *py) {
- if (p2) {
- *px = p2->view_xmin + (int) (p2->dx*(x-p2->xmin) + 0.5);
- *py = p2->view_ymin + (int) (p2->dy*(y-p2->ymin) + 0.5);
- }
-}
-
-/* -------------------------------------------------------------------------------
- Plot2D_plot(Plot2D *p2, double x, double y, Pixel color)
-
- Plot a 2D Point of a given color
- ------------------------------------------------------------------------------- */
-void
-Plot2D_plot(Plot2D *p2, double x, double y, Pixel color) {
- int px, py;
-
- Plot2D_transform(p2,x,y,&px,&py);
- FrameBuffer_plot(p2->frame, px, py, color);
-}
-
-/* -------------------------------------------------------------------------------
- Plot2D_box(Plot2D *p2, double x1, double y1, double x2, double y2, Pixel Color)
-
- Plot an outline box on the 2D plot
- ------------------------------------------------------------------------------- */
-void
-Plot2D_box(Plot2D *p2, double x1, double y1,double x2, double y2, Pixel color) {
- int ix1, ix2,iy1, iy2;
-
- Plot2D_transform(p2,x1,y1,&ix1,&iy1);
- Plot2D_transform(p2,x2,y2,&ix2,&iy2);
- FrameBuffer_box(p2->frame,ix1,iy1,ix2,iy2,color);
-}
-
-/* -------------------------------------------------------------------------------
- Plot2D_solidbox(Plot2D *p2, double x1, double y1, double x2, double y2, Pixel Color)
-
- Plot a solid box box on the 2D plot
- ------------------------------------------------------------------------------- */
-void
-Plot2D_solidbox(Plot2D *p2, double x1, double y1,double x2, double y2, Pixel color) {
- int ix1, ix2,iy1, iy2;
-
- Plot2D_transform(p2,x1,y1,&ix1,&iy1);
- Plot2D_transform(p2,x2,y2,&ix2,&iy2);
- FrameBuffer_solidbox(p2->frame,ix1,iy1,ix2,iy2,color);
-}
-
-/* -------------------------------------------------------------------------------
- Plot2D_interpbox(Plot2D *p2, double x1, double y1, double x2, double y2,
- Pixel c1, Pixel c2, Pixel c3, Pixel c4)
-
- Plot a color-interpolated box on the 2D plot
- ------------------------------------------------------------------------------- */
-void
-Plot2D_interpbox(Plot2D *p2, double x1, double y1,double x2, double y2,
- Pixel c1, Pixel c2, Pixel c3, Pixel c4) {
- int ix1, ix2,iy1, iy2;
-
- Plot2D_transform(p2,x1,y1,&ix1,&iy1);
- Plot2D_transform(p2,x2,y2,&ix2,&iy2);
- FrameBuffer_interpbox(p2->frame,ix1,iy1,ix2,iy2,c1,c2,c3,c4);
-}
-
-/* -------------------------------------------------------------------------------
- Plot2D_circle(Plot2D *p2, double x, double y, double radius, Pixel color)
-
- Make an outline circle on the 2D plot.
- ------------------------------------------------------------------------------- */
-void
-Plot2D_circle(Plot2D *p2, double x, double y, double radius, Pixel color) {
- int ix, iy, ir;
-
- Plot2D_transform(p2,x,y,&ix,&iy);
- ir = p2->dx * radius; /* This is really incorrect. Will need ellipse */
- if (ir > 1)
- FrameBuffer_circle(p2->frame,ix,iy,ir,color);
- else
- FrameBuffer_plot(p2->frame,ix,iy,color);
-
-}
-
-/* -------------------------------------------------------------------------------
- Plot2D_solidcircle(Plot2D *p2, double x, double y, double radius, Pixel color)
-
- Make an solid circle on the 2D plot.
- ------------------------------------------------------------------------------- */
-void
-Plot2D_solidcircle(Plot2D *p2, double x, double y, double radius, Pixel color) {
- int ix, iy, ir;
-
- Plot2D_transform(p2,x,y,&ix,&iy);
- ir = p2->dx * radius; /* This is really incorrect. Will need ellipse */
- if (ir > 1)
- FrameBuffer_solidcircle(p2->frame,ix,iy,ir,color);
- else
- FrameBuffer_plot(p2->frame,ix,iy,color);
-}
-
-/* -------------------------------------------------------------------------------
- Plot2D_line(Plot2D *p2, double x1, double y1, double x2, double y2, Pixel color)
-
- Draw a line
- ------------------------------------------------------------------------------- */
-
-void
-Plot2D_line(Plot2D *p2, double x1, double y1, double x2, double y2, Pixel color) {
- int ix1, ix2, iy1, iy2;
-
- Plot2D_transform(p2,x1,y1,&ix1,&iy1);
- Plot2D_transform(p2,x2,y2,&ix2,&iy2);
- FrameBuffer_line(p2->frame,ix1,iy1,ix2,iy2,color);
-}
-
-
-
-/* -------------------------------------------------------------------------------
- Plot2D_start(Plot2D *p2)
-
- This should be called before starting to make a 2D plot. It will change
- the viewport coordinates for the framebuffer and do other stuff.
- ------------------------------------------------------------------------------- */
-
-void Plot2D_start(Plot2D *p2) {
- if (p2) {
- FrameBuffer_setclip(p2->frame, p2->view_xmin,p2->view_ymin,p2->view_xmax, p2->view_ymax);
- p2->dx = (p2->view_xmax - p2->view_xmin)/(p2->xmax - p2->xmin);
- p2->dy = (p2->view_ymax - p2->view_ymin)/(p2->ymax - p2->ymin);
- }
-}
-
-/* --------------------------------------------------------------------------
- void Plot2D_drawpixmap(Plot2D *p2, PixMap *pm, double x, double y, Pixel color, Pixel bgcolor)
-
- Draw a pixel map at the given coordinates. (Used for putting symbols on 2D
- plots).
- -------------------------------------------------------------------------- */
-void
-Plot2D_drawpixmap(Plot2D *p2, PixMap *pm, double x, double y, Pixel color, Pixel bgcolor) {
- int ix, iy;
-
- Plot2D_transform(p2,x,y,&ix,&iy);
- FrameBuffer_drawpixmap(p2->frame,pm,ix,iy,color,bgcolor);
-}
-
-/* ----------------------------------------------------------------------------
- void Plot2D_xaxis(Plot2D *p2, double x, double y, double xtick, int ticklength, Pixel color)
-
- Draw an X axis bar at location x,y with ticks spaced every xtick units.
- Ticks are spaced starting at "x"
- ----------------------------------------------------------------------------- */
-
-void Plot2D_xaxis(Plot2D *p2, double x, double y, double xtick, int ticklength, Pixel color) {
- int ix, iy,iy2;
- double xt;
-
- /* Draw a line fox the axis */
-
- Plot2D_line(p2,p2->xmin,y,p2->xmax,y,color);
- xt = x;
- while (xt >= p2->xmin) {
- Plot2D_transform(p2,xt,y,&ix,&iy);
- iy2 = iy+ticklength;
- iy = iy-ticklength;
- FrameBuffer_line(p2->frame,ix,iy,ix,iy2,color);
- xt = xt - xtick;
- }
- xt = x + xtick;
- while (xt < p2->xmax) {
- Plot2D_transform(p2,xt,y,&ix,&iy);
- iy2 = iy+ticklength;
- iy = iy-ticklength;
- FrameBuffer_line(p2->frame,ix,iy,ix,iy2,color);
- xt = xt + xtick;
- }
-}
-
-
-/* ----------------------------------------------------------------------------
- void Plot2D_yaxis(Plot2D *p2, double x, double y, double ytick, int ticklength, Pixel c)
-
- Draw an Y axis bar at location x,y with ticks spaced every xtick units.
- Ticks are spaced starting at "y"
- ----------------------------------------------------------------------------- */
-
-void Plot2D_yaxis(Plot2D *p2, double x, double y, double ytick, int ticklength, Pixel color) {
- int ix, iy, ix2;
- double yt;
-
- /* Draw a line fox the axis */
-
- Plot2D_line(p2,x,p2->ymin,x,p2->ymax,color);
- yt = y;
- while (yt >= p2->ymin) {
- Plot2D_transform(p2,x,yt,&ix,&iy);
- ix2 = ix+ticklength;
- ix = ix-ticklength;
- FrameBuffer_line(p2->frame,ix,iy,ix2,iy,color);
- yt = yt - ytick;
- }
- yt = y + ytick;
- while (yt < p2->ymax) {
- Plot2D_transform(p2,x,yt,&ix,&iy);
- ix2 = ix+ticklength;
- ix = ix-ticklength;
- FrameBuffer_line(p2->frame,ix,iy,ix2,iy,color);
- yt = yt + ytick;
- }
-}
-
-
-/* -------------------------------------------------------------------------
- Plot2D_triangle(Plot2D *p2, double x1, double y1,
- double x2, double y2,
- double x3, double y3,
- Pixel fillcolor)
-
- This function draws a 2D outline triangle.
- -------------------------------------------------------------------------- */
-
-void Plot2D_triangle(Plot2D *p2, double x1, double y1,
- double x2, double y2,
- double x3, double y3, Pixel color) {
-
- Plot2D_line(p2,x1,y1,x2,y2,color);
- Plot2D_line(p2,x2,y2,x3,y3,color);
- Plot2D_line(p2,x3,y3,x1,y1,color);
-
-}
-
-
-/* -------------------------------------------------------------------------
- Plot2D_solidtriangle(Plot2D *p2, double x1, double y1,
- double x2, double y2,
- double x3, double y3,
- Pixel color)
-
- This function draws a 2D filled triangle. Can be used to
- draw other primitives such as quadralaterals, etc...
-
- -------------------------------------------------------------------------- */
-
-void Plot2D_solidtriangle(Plot2D *p2, double x1, double y1,
-
- double x2, double y2,
- double x3, double y3, Pixel color) {
-
- int tx1, tx2, tx3, ty1, ty2, ty3;
-
- /* Transform the three points into screen coordinates */
-
- Plot2D_transform(p2,x1,y1,&tx1,&ty1);
- Plot2D_transform(p2,x2,y2,&tx2,&ty2);
- Plot2D_transform(p2,x3,y3,&tx3,&ty3);
-
- FrameBuffer_solidtriangle(p2->frame,tx1,ty1,tx2,ty2,tx3,ty3,color);
-
-}
-
-/* -------------------------------------------------------------------------
- Plot2D_interptriangle(Plot2D *p2, double x1, double y1, Pixel c1,
- double x2, double y2, Pixel c2,
- double x3, double y3, Pixel c3);
-
- This function draws a 2D filled triangle with color interpolation.
- Can be used to draw other primitives such as quadralaterals, etc...
- -------------------------------------------------------------------------- */
-
-void Plot2D_interptriangle(Plot2D *p2, double x1, double y1, Pixel c1,
- double x2, double y2, Pixel c2,
- double x3, double y3, Pixel c3) {
-
- int tx1, tx2, tx3, ty1, ty2, ty3;
-
- /* Transform the three points into screen coordinates */
-
- Plot2D_transform(p2,x1,y1,&tx1,&ty1);
- Plot2D_transform(p2,x2,y2,&tx2,&ty2);
- Plot2D_transform(p2,x3,y3,&tx3,&ty3);
-
- FrameBuffer_interptriangle(p2->frame,tx1,ty1,c1,tx2,ty2,c2,tx3,ty3,c3);
-
-}
-
-
-
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