109 lines
2.7 KiB
C++
109 lines
2.7 KiB
C++
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#include <math.h>
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#include <float.h>
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#include <iostream>
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#include "Plot.h"
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PlotSeries::PlotSeries(PlotSeries::Style style, Color color)
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: color(color), style(style)
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{ }
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void PlotSeries::draw(RefPtr<Context> ctx) {
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ctx->set_source_rgb(color.red, color.green, color.blue); /* set series color */
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/* determine maxima and minima for autoscale */
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double min = DBL_MAX, max = DBL_MIN;
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for (std::list<double>::iterator it = begin(); it != end(); it++) {
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if (*it > max) max = *it;
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if (*it < min) min = *it;
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}
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/* stroke */
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int width = 800;//dynamic_cast<RefPtr<XlibSurface>>(ctx->get_target())->get_width();
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int height = 400;//dynamic_cast<RefPtr<XlibSurface>>(ctx->get_target())->get_height();
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ctx->move_to(Plot::PADDING, (height/2) + (height-2*Plot::PADDING) * (front()/max));
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int i = 0;
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for (std::list<double>::iterator it = begin(); it != end(); it++) {
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i++;
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ctx->line_to(i * 2 + Plot::PADDING, (height/2) + (height-2*Plot::PADDING) * (*it/max*0.5));
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}
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ctx->stroke();
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}
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Plot::Plot(int width, int height)
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: width(width), height(height)
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{
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window = XWindow::create("Frontend", 1, 1, width, height);
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surface = XlibSurface::create(window->getDisplay(), window->getWindow(), window->getVisual(), width, height);
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}
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void Plot::draw() {
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RefPtr<Context> ctx = Context::create(surface);
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ctx->set_antialias(ANTIALIAS_SUBPIXEL);
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/* background */
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ctx->set_source_rgb(0, 0, 0); /* black */
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ctx->paint();
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ctx->set_source_rgb(0, 0.7, 0.1); /* axis & tick color */
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drawAxes(ctx);
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drawTicks(ctx);
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for (std::list<PlotSeries *>::iterator it = series.begin(); it != series.end(); it++) {
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(*it)->draw(ctx);
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}
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}
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void Plot::drawAxes(RefPtr<Context> ctx) {
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ctx->set_line_width(1.8);
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/* x-axis */
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ctx->move_to(PADDING, height-PADDING);
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ctx->line_to(width-PADDING, height-PADDING);
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ctx->stroke();
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/* y-axis */
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ctx->move_to(PADDING, height-PADDING);
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ctx->line_to(PADDING, PADDING);
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ctx->stroke();
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/* arrows (arcs) */
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ctx->move_to(width-PADDING-2, height-PADDING-4);
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ctx->line_to(width-PADDING+5, height-PADDING);
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ctx->line_to(width-PADDING-2, height-PADDING+4);
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ctx->stroke();
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ctx->move_to(PADDING-4, PADDING+2);
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ctx->line_to(PADDING, PADDING-5);
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ctx->line_to(PADDING+4, PADDING+2);
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ctx->stroke();
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}
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void Plot::drawTicks(RefPtr<Context> ctx) {
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int ticks = 20;
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int intv_x = (width-2*PADDING)/ticks;
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int intv_y = (height-2*PADDING)/ticks;
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ctx->set_line_width(1);
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for (int i = 0; i < ticks; i++) {
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/* x-axis */
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ctx->move_to(PADDING + i*intv_x, height-PADDING-3);
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ctx->line_to(PADDING + i*intv_x, height-PADDING+3);
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ctx->stroke();
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/* y-axis */
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ctx->move_to(PADDING-3, PADDING + (i+1)*intv_y);
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ctx->line_to(PADDING+3, PADDING + (i+1)*intv_y);
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ctx->stroke();
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}
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}
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Plot::~Plot() {
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}
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