291 lines
8.6 KiB
C++
291 lines
8.6 KiB
C++
/*
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* graph.hpp
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* Montauk Toolkit graph helpers
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* Copyright (c) 2026 Daniel Hammer
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*/
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#pragma once
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#include "gui/mtk/widgets.hpp"
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namespace gui::mtk {
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struct GraphHistory {
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uint64_t* samples;
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int capacity;
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int count;
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int head;
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};
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struct GraphStyle {
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Color background;
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Color border;
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Color plot_bg;
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Color grid;
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Color label;
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Color value;
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Color line;
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Color fill;
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int radius;
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int padding;
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int grid_x;
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int grid_y;
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int line_thickness;
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bool fill_area;
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};
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inline GraphStyle make_graph_style(const Theme& theme, Color line) {
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return {
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theme.window_bg,
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theme.border,
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theme.surface_alt,
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mix(theme.surface_alt, line, 18),
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theme.text_subtle,
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theme.text,
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line,
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lighten(line, 218),
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theme.radius_md,
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8,
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4,
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4,
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2,
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true,
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};
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}
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inline void graph_history_init(GraphHistory* history, uint64_t* samples, int capacity) {
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if (!history) return;
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history->samples = samples;
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history->capacity = capacity;
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history->count = 0;
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history->head = 0;
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}
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inline void graph_history_clear(GraphHistory* history) {
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if (!history) return;
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history->count = 0;
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history->head = 0;
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}
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inline void graph_history_push(GraphHistory* history, uint64_t value) {
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if (!history || !history->samples || history->capacity <= 0) return;
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history->samples[history->head] = value;
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history->head = (history->head + 1) % history->capacity;
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if (history->count < history->capacity)
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history->count++;
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}
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inline uint64_t graph_history_at(const GraphHistory& history, int index) {
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if (!history.samples || history.capacity <= 0 ||
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index < 0 || index >= history.count) {
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return 0;
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}
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int start = history.head - history.count;
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while (start < 0) start += history.capacity;
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return history.samples[(start + index) % history.capacity];
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}
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inline uint64_t graph_history_max(const GraphHistory& history) {
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uint64_t max_value = 0;
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for (int i = 0; i < history.count; i++) {
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uint64_t value = graph_history_at(history, i);
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if (value > max_value) max_value = value;
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}
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return max_value;
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}
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inline int graph_sample_x(const Rect& plot, int index, int count) {
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if (count <= 1) return plot.x + plot.w - 1;
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return plot.x + (int)(((int64_t)index * (plot.w - 1)) / (count - 1));
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}
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inline int graph_sample_y(const Rect& plot, uint64_t sample, uint64_t max_value) {
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if (plot.h <= 1) return plot.y;
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if (max_value == 0) max_value = 1;
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if (sample > max_value) sample = max_value;
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uint64_t scaled = (sample * (uint64_t)(plot.h - 1)) / max_value;
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return plot.y + plot.h - 1 - (int)scaled;
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}
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inline void graph_draw_point(Canvas& c,
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const Rect& clip,
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int x,
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int y,
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Color color,
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int thickness) {
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thickness = gui_max(thickness, 1);
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int radius = thickness / 2;
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for (int py = y - radius; py <= y - radius + thickness - 1; py++) {
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for (int px = x - radius; px <= x - radius + thickness - 1; px++) {
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if (clip.contains(px, py))
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c.put_pixel(px, py, color);
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}
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}
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}
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inline void graph_draw_line(Canvas& c,
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const Rect& clip,
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int x0,
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int y0,
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int x1,
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int y1,
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Color color,
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int thickness) {
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int dx = gui_abs(x1 - x0);
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int sx = x0 < x1 ? 1 : -1;
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int dy = -gui_abs(y1 - y0);
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int sy = y0 < y1 ? 1 : -1;
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int err = dx + dy;
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for (;;) {
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graph_draw_point(c, clip, x0, y0, color, thickness);
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if (x0 == x1 && y0 == y1) break;
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int e2 = 2 * err;
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if (e2 >= dy) {
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err += dy;
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x0 += sx;
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}
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if (e2 <= dx) {
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err += dx;
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y0 += sy;
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}
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}
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}
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inline void graph_fill_segment(Canvas& c,
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const Rect& clip,
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int x0,
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int y0,
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int x1,
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int y1,
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Color color) {
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int bottom = clip.y + clip.h - 1;
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if (x0 == x1) {
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int y = gui_min(y0, y1);
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if (clip.contains(x0, y))
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c.vline(x0, y, bottom - y + 1, color);
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return;
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}
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if (x1 < x0) {
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int tx = x0; x0 = x1; x1 = tx;
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int ty = y0; y0 = y1; y1 = ty;
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}
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for (int x = x0; x <= x1; x++) {
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if (x < clip.x || x >= clip.x + clip.w) continue;
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int y = y0 + (int)(((int64_t)(y1 - y0) * (x - x0)) / (x1 - x0));
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if (y < clip.y) y = clip.y;
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if (y > bottom) y = bottom;
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c.vline(x, y, bottom - y + 1, color);
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}
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}
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inline void draw_line_graph(Canvas& c,
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const Rect& bounds,
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const GraphHistory& history,
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uint64_t max_value,
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const char* title,
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const char* value_label,
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const Theme& theme,
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const GraphStyle& style) {
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if (bounds.empty()) return;
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draw_rounded_frame(c, bounds, style.radius, style.background, style.border);
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int fh = system_font_height();
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int pad = gui_max(style.padding, 4);
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int title_y = bounds.y + pad;
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int title_x = bounds.x + pad;
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if (title && title[0])
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c.text(title_x, title_y, title, style.label);
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if (value_label && value_label[0]) {
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int value_w = text_width(value_label);
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int value_x = bounds.x + bounds.w - pad - value_w;
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if (value_x > title_x)
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c.text(value_x, title_y, value_label, style.value);
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}
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Rect plot = {
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bounds.x + pad,
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bounds.y + pad + fh + 7,
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bounds.w - pad * 2,
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bounds.h - pad * 2 - fh - 7
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};
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if (plot.empty()) return;
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c.fill_rect(plot.x, plot.y, plot.w, plot.h, style.plot_bg);
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int sample_count = history.count;
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if (sample_count > 0) {
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if (max_value == 0)
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max_value = graph_history_max(history);
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if (max_value == 0)
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max_value = 1;
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if (style.fill_area && sample_count > 1) {
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int prev_x = graph_sample_x(plot, 0, sample_count);
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int prev_y = graph_sample_y(plot, graph_history_at(history, 0), max_value);
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for (int i = 1; i < sample_count; i++) {
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int x = graph_sample_x(plot, i, sample_count);
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int y = graph_sample_y(plot, graph_history_at(history, i), max_value);
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graph_fill_segment(c, plot, prev_x, prev_y, x, y, style.fill);
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prev_x = x;
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prev_y = y;
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}
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}
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}
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if (style.grid_y > 0) {
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for (int i = 1; i < style.grid_y; i++) {
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int y = plot.y + (plot.h * i) / style.grid_y;
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c.hline(plot.x, y, plot.w, style.grid);
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}
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}
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if (style.grid_x > 0) {
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for (int i = 1; i < style.grid_x; i++) {
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int x = plot.x + (plot.w * i) / style.grid_x;
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c.vline(x, plot.y, plot.h, style.grid);
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}
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}
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c.rect(plot.x, plot.y, plot.w, plot.h, style.border);
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if (sample_count == 1) {
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int x = graph_sample_x(plot, 0, sample_count);
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int y = graph_sample_y(plot, graph_history_at(history, 0), max_value);
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graph_draw_point(c, plot, x, y, style.line, style.line_thickness + 1);
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} else if (sample_count > 1) {
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int prev_x = graph_sample_x(plot, 0, sample_count);
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int prev_y = graph_sample_y(plot, graph_history_at(history, 0), max_value);
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for (int i = 1; i < sample_count; i++) {
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int x = graph_sample_x(plot, i, sample_count);
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int y = graph_sample_y(plot, graph_history_at(history, i), max_value);
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graph_draw_line(c, plot, prev_x, prev_y, x, y,
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style.line, style.line_thickness);
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prev_x = x;
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prev_y = y;
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}
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}
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(void)theme;
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}
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inline void draw_line_graph(Canvas& c,
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const Rect& bounds,
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const GraphHistory& history,
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uint64_t max_value,
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const char* title,
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const char* value_label,
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const Theme& theme,
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Color line) {
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GraphStyle style = make_graph_style(theme, line);
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draw_line_graph(c, bounds, history, max_value, title, value_label, theme, style);
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}
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} // namespace gui::mtk
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