void idle(void)
{
if (deltaSinceDraw) {
x += deltaSinceDraw;
clamp_x();
draw();
deltaSinceDraw = 0;
}
}
/* ARGSUSED */
void button(int button, int state, int xpos, int ypos)
{
if (state == GLUT_DOWN) {
mouseOriginX = xpos;
deltaSinceDraw = 0;
glutIdleFunc(idle);
return;
}
if (!moveCalled) {
if (button == GLUT_MIDDLE_BUTTON) x = 1.;
else x = (float)xpos / ((float)w / 2.);
clamp_x();
deltaSinceDraw = 100000.;
}
moveCalled = 0;
if (deltaSinceDraw) draw();
printf("x = %f\n", x);
glutIdleFunc(NULL);
}
static void
paint_large_line (GooDemoLargeLine *line,
cairo_t *cr,
const GooCanvasBounds *bounds,
gdouble line_width,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2)
{
GooCanvasItem *item = (GooCanvasItem*) line;
GooCanvasItemSimple *simple = (GooCanvasItemSimple*) line;
GooCanvas *canvas = simple->canvas;
GooCanvasBounds tmp_bounds = *bounds;
gdouble point1[2], point2[2], *p1, *p2;
point1[0] = x1;
point1[1] = y1;
point2[0] = x2;
point2[1] = y2;
/* Transform the coordinates to the canvas device space, so we can clamp
the line to the bounds to be painted. */
goo_canvas_convert_from_item_space (canvas, item, &point1[0], &point1[1]);
goo_canvas_convert_from_item_space (canvas, item, &point2[0], &point2[1]);
/* Extend the bounds a bit to account for the line width. */
tmp_bounds.x1 -= line_width;
tmp_bounds.y1 -= line_width;
tmp_bounds.x2 += line_width;
tmp_bounds.y2 += line_width;
/* Make p1 the left-most point. */
if (point1[0] < point2[0])
{
p1 = point1;
p2 = point2;
}
else
{
p1 = point2;
p2 = point1;
}
/* Just return if the line is completely outside the bounds horizontally. */
if (p2[0] < tmp_bounds.x1 || p1[0] > tmp_bounds.x2)
return;
/* Clamp each x coordinate to the bounds. */
if (p1[0] < tmp_bounds.x1)
clamp_x (p1, p2, tmp_bounds.x1);
if (p2[0] > tmp_bounds.x2)
clamp_x (p2, p1, tmp_bounds.x2);
/* Now make p1 the top-most point. */
if (point1[1] < point2[1])
{
p1 = point1;
p2 = point2;
}
else
{
p1 = point2;
p2 = point1;
}
/* Just return if the line is completely outside the bounds vertically. */
if (p2[1] < tmp_bounds.y1 || p1[1] > tmp_bounds.y2)
return;
/* Clamp each y coordinate to the bounds. */
if (p1[1] < tmp_bounds.y1)
clamp_y (p1, p2, tmp_bounds.y1);
if (p2[1] > tmp_bounds.y2)
clamp_y (p2, p1, tmp_bounds.y2);
/* Convert back to item space. */
goo_canvas_convert_to_item_space (canvas, item, &point1[0], &point1[1]);
goo_canvas_convert_to_item_space (canvas, item, &point2[0], &point2[1]);
/* Draw the line. */
cairo_move_to (cr, point1[0], point1[1]);
cairo_line_to (cr, point2[0], point2[1]);
cairo_stroke (cr);
}
