b8e97d7c28
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12970 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
144 lines
3.2 KiB
C++
144 lines
3.2 KiB
C++
//
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// "$Id$"
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//
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// Portable drawing routines for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2017 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// http://www.fltk.org/COPYING.php
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//
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// Please report all bugs and problems on the following page:
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//
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// http://www.fltk.org/str.php
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//
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/**
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\file fl_vertex.cxx
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\brief Portable drawing code for drawing arbitrary shapes with
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simple 2D transformations.
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*/
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// Portable code for drawing arbitrary shapes with simple 2D transformations.
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// See also fl_arc.cxx
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// matt: the Quartz implementation purposely doesn't use the Quartz matrix
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// operations for reasons of compatibility and maintainability
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// -----------------------------------------------------------------------------
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// all driver code is now in drivers/XXX/Fl_XXX_Graphics_Driver_xyz.cxx
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// -----------------------------------------------------------------------------
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#include <FL/Fl_Graphics_Driver.H>
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#include <FL/Fl.H>
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#include <FL/math.h>
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#include <stdlib.h>
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/**
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\cond DriverDev
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\addtogroup DriverDeveloper
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\{
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*/
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/** see fl_push_matrix() */
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void Fl_Graphics_Driver::push_matrix() {
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if (sptr==matrix_stack_size)
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Fl::error("fl_push_matrix(): matrix stack overflow.");
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else
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stack[sptr++] = m;
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}
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/** see fl_pop_matrix() */
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void Fl_Graphics_Driver::pop_matrix() {
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if (sptr==0)
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Fl::error("fl_pop_matrix(): matrix stack underflow.");
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else
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m = stack[--sptr];
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}
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/** see fl_mult_matrix() */
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void Fl_Graphics_Driver::mult_matrix(double a, double b, double c, double d, double x, double y) {
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matrix o;
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o.a = a*m.a + b*m.c;
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o.b = a*m.b + b*m.d;
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o.c = c*m.a + d*m.c;
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o.d = c*m.b + d*m.d;
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o.x = x*m.a + y*m.c + m.x;
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o.y = x*m.b + y*m.d + m.y;
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m = o;
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}
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/** see fl_rotate() */
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void Fl_Graphics_Driver::rotate(double d) {
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if (d) {
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double s, c;
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if (d == 0) {s = 0; c = 1;}
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else if (d == 90) {s = 1; c = 0;}
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else if (d == 180) {s = 0; c = -1;}
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else if (d == 270 || d == -90) {s = -1; c = 0;}
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else {s = sin(d*M_PI/180); c = cos(d*M_PI/180);}
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mult_matrix(c,-s,s,c,0,0);
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}
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}
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/** see fl_translate() */
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void Fl_Graphics_Driver::translate(double x,double y) {
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mult_matrix(1,0,0,1,x,y);
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}
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/** see fl_begin_points() */
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void Fl_Graphics_Driver::begin_points() {
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n = 0;
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what = POINT_;
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}
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/** see fl_begin_line() */
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void Fl_Graphics_Driver::begin_line() {
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n = 0;
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what = LINE;
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}
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/** see fl_begin_loop() */
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void Fl_Graphics_Driver::begin_loop() {
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n = 0;
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what = LOOP;
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}
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/** see fl_begin_polygon() */
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void Fl_Graphics_Driver::begin_polygon() {
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n = 0;
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what = POLYGON;
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}
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/** see fl_transform_x() */
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double Fl_Graphics_Driver::transform_x(double x, double y) {
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return x*m.a + y*m.c + m.x;
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}
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/** see fl_transform_y() */
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double Fl_Graphics_Driver::transform_y(double x, double y) {
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return x*m.b + y*m.d + m.y;
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}
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/** see fl_transform_dx() */
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double Fl_Graphics_Driver::transform_dx(double x, double y) {
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return x*m.a + y*m.c;
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}
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/** see fl_transform_dy() */
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double Fl_Graphics_Driver::transform_dy(double x, double y) {
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return x*m.b + y*m.d;
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}
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/**
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\}
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\endcond
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*/
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//
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// End of "$Id$".
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//
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