b72ade0e78
Previously we passed in width and height and the routine itself decided to keep 5% margin around each edge - oddly doing this with double precision, even though this is all integer coordinates. Instead we are now passing in a drawing_area. We are kind of abusing the cairo_rectangle_int_t data type here - but it seemed silly to redefine a new data type for this. Width and height give the size of the TOTAL drawing area (as before). x and y give the offset from the edges - so the EFFECTIVE drawing area is width-2x and height-2y This is in preparation for adding tooltips - those need to know the coordinate offsets from the edges - so having this hard coded inside the plot function didn't make sense anymore. Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
29 lines
753 B
C
29 lines
753 B
C
#ifndef DISPLAY_H
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#define DISPLAY_H
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#include <cairo.h>
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extern void repaint_dive(void);
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extern void do_print(void);
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/*
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* Cairo scaling really is horribly horribly mis-designed.
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*
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* Which is sad, because I really like Cairo otherwise. But
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* the fact that the line width is scaled with the same scale
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* as the coordinate system is a f*&%ing disaster. So we
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* can't use it, and instead have this butt-ugly wrapper thing..
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*/
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struct graphics_context {
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int printer;
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cairo_t *cr;
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double maxx, maxy;
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double leftx, rightx;
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double topy, bottomy;
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};
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extern void plot(struct graphics_context *gc, cairo_rectangle_int_t *drawing_area, struct dive *dive);
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extern void set_source_rgb(struct graphics_context *gc, double r, double g, double b);
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#endif
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