Implement fill algorithms
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parent
4ddcbccd01
commit
0f847a08ab
4 changed files with 99 additions and 59 deletions
4
.vscode/settings.json
vendored
4
.vscode/settings.json
vendored
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@ -35,6 +35,8 @@
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"typeinfo": "cpp",
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"typeinfo": "cpp",
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"utility": "cpp",
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"utility": "cpp",
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"__config": "cpp",
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"__config": "cpp",
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"__nullptr": "cpp"
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"__nullptr": "cpp",
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"deque": "cpp",
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"algorithm": "cpp"
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}
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}
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}
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}
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@ -16,11 +16,6 @@ bresenham_line_tool::bresenham_line_tool(canvas_buffer &canvas) : tool_base(canv
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shape = TS_LINE;
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shape = TS_LINE;
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}
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}
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void print_point(int x, int y)
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{
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std::cout << "point (" << x << ", " << y << ")" << std::endl;
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}
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// Draw a line from (x0, y0) to (x1, y1)
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// Draw a line from (x0, y0) to (x1, y1)
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void bresenham_line_tool::draw(int x0, int y0, int x1, int y1)
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void bresenham_line_tool::draw(int x0, int y0, int x1, int y1)
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{
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{
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@ -40,21 +35,12 @@ void bresenham_line_tool::draw(int x0, int y0, int x1, int y1)
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muessen koennen Sie dafür die Methode "std::swap(a, b)" verwenden.
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muessen koennen Sie dafür die Methode "std::swap(a, b)" verwenden.
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*************/
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*************/
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std::cout << "first: " << std::endl;
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print_point(x0, y0);
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print_point(x1, y1);
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if (x0 > x1)
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if (x0 > x1)
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{
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{
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std::swap(x0, x1);
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std::swap(x0, x1);
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std::swap(y0, y1);
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std::swap(y0, y1);
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}
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}
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std::cout << "second: " << std::endl;
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print_point(x0, y0);
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print_point(x1, y1);
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std::cout << std::endl;
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bool swap_y = false;
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bool swap_y = false;
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if (y0 > y1)
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if (y0 > y1)
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@ -6,6 +6,8 @@
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#include "non_recursive_fill_tool.h"
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#include "non_recursive_fill_tool.h"
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#include <deque>
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#include <deque>
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#include <iostream>
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// Initialize the tool and store a reference of a canvas_buffer
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// Initialize the tool and store a reference of a canvas_buffer
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non_recursive_fill_tool::non_recursive_fill_tool(canvas_buffer &canvas) : tool_base(canvas)
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non_recursive_fill_tool::non_recursive_fill_tool(canvas_buffer &canvas) : tool_base(canvas)
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{
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{
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@ -14,13 +16,19 @@ non_recursive_fill_tool::non_recursive_fill_tool(canvas_buffer& canvas): tool_ba
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is_draggable = false;
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is_draggable = false;
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}
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}
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// A pixel to be put into the queue of pixels to process
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// A pixel to be put into the queue of pixels to process
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struct waiting_pixel {
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struct waiting_pixel
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{
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waiting_pixel(int x, int y) : x(x), y(y) {}
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waiting_pixel() : x(0), y(0) {}
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int x, y;
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int x, y;
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};
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};
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void print_point(int x, int y)
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{
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std::cout << "point (" << x << ", " << y << ")" << std::endl;
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}
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void non_recursive_fill_tool::draw(int x, int y)
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void non_recursive_fill_tool::draw(int x, int y)
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{
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{
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@ -35,10 +43,10 @@ void non_recursive_fill_tool::draw(int x, int y)
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think about when to set the pixel (at the beginning of the loop or after
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think about when to set the pixel (at the beginning of the loop or after
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the stack was updated with neighbours). Use "canvas.set_pixel" to set
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the stack was updated with neighbours). Use "canvas.set_pixel" to set
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a pixel and "canvas.get_pixel" to read the state of a pixel.
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a pixel and "canvas.get_pixel" to read the state of a pixel.
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Aufgabe 3.2.2. Implementieren Sie einen Füllalgorithmus ohne Rekursion zu verwenden.
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Aufgabe 3.2.2. Implementieren Sie einen F<EFBFBD>llalgorithmus ohne Rekursion zu verwenden.
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Nutzen Sie stattdessen einen Stack. Der vorgegebene Quelltext unten fuegt
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Nutzen Sie stattdessen einen Stack. Der vorgegebene Quelltext unten fuegt
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das erste Element in den Stack ein und startet eine Schleife, die das
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das erste Element in den Stack ein und startet eine Schleife, die das
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vorderste Element aus dem Stack liest und es anschließend entfernt.
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vorderste Element aus dem Stack liest und es anschlie<EFBFBD>end entfernt.
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Ihre Aufgabe ist es die Funktionalitaet im Inneren der Schleife zu
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Ihre Aufgabe ist es die Funktionalitaet im Inneren der Schleife zu
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ergaenzen. Bevor Sie beginnen machen Sie sich Gedanken an welcher Stelle
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ergaenzen. Bevor Sie beginnen machen Sie sich Gedanken an welcher Stelle
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das tatsaechliche Setzen eines Pixels erfolgt (am Beginn der Schleife oder
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das tatsaechliche Setzen eines Pixels erfolgt (am Beginn der Schleife oder
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@ -47,31 +55,51 @@ void non_recursive_fill_tool::draw(int x, int y)
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den Zustand eines Pixels zu erhalten.
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den Zustand eines Pixels zu erhalten.
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*************/
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*************/
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// Put the initial pixel into the stack
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// Put the initial pixel into the stack
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if (!canvas.get_pixel(x, y)) {
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if (!canvas.get_pixel(x, y))
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{
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p.x = x;
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p.x = x;
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p.y = y;
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p.y = y;
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canvas.set_pixel(x, y);
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stack.push_back(p);
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stack.push_back(p);
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}
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}
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// While there are pixels to be checked
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// While there are pixels to be checked
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while (!stack.empty()) {
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while (!stack.empty())
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{
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int cur_x = stack.front().x;
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int x = stack.front().x;
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int cur_y = stack.front().y;
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int y = stack.front().y;
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// Complete the algorithm here
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// Complete the algorithm here
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if (!canvas.get_pixel(x, y))
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{
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canvas.set_pixel(x, y);
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// add neighbours with bounds check
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if (x > 0)
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{
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stack.emplace_back(x - 1, y);
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}
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if (y > 0)
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{
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stack.emplace_back(x, y - 1);
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}
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if (y < canvas.get_height() - 1)
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{
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stack.emplace_back(x, y + 1);
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}
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if (x < canvas.get_width() - 1)
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{
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stack.emplace_back(x + 1, y);
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}
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}
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stack.pop_front();
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stack.pop_front();
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}
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}
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}
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}
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// Put debug output into the stream "stream" to be displayed in the
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// Put debug output into the stream "stream" to be displayed in the
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// main window
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// main window
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void non_recursive_fill_tool::set_text(std::stringstream &stream)
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void non_recursive_fill_tool::set_text(std::stringstream &stream)
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@ -13,8 +13,6 @@ recursive_fill_tool::recursive_fill_tool(canvas_buffer& canvas): tool_base(canva
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is_draggable = false;
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is_draggable = false;
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}
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}
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// Fill the shape that contains the point (x, y)
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// Fill the shape that contains the point (x, y)
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void recursive_fill_tool::draw(int x, int y)
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void recursive_fill_tool::draw(int x, int y)
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{
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{
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@ -26,16 +24,42 @@ void recursive_fill_tool::draw(int x, int y)
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"canvas.set_pixel(x, y)".
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"canvas.set_pixel(x, y)".
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This method will make the application crash if the area which shall
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This method will make the application crash if the area which shall
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be filled is too big.
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be filled is too big.
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Aufgabe 3.2.1. Implementieren Sie den rekursiven Füllalgorithmus, indem Sie den
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Aufgabe 3.2.1. Implementieren Sie den rekursiven F<EFBFBD>llalgorithmus, indem Sie den
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Zustand der Nachbarpixel überprüfen (mittels "canvas.get_pixel(x, y)"
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Zustand der Nachbarpixel <EFBFBD>berpr<EFBFBD>fen (mittels "canvas.get_pixel(x, y)"
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wobei "x" und "y" die Position des zu überprüfenden Pixels definieren)
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wobei "x" und "y" die Position des zu <EFBFBD>berpr<EFBFBD>fenden Pixels definieren)
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und rufen Sie rekursiv die "draw"-Methode auf, wenn die Pixel nicht
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und rufen Sie rekursiv die "draw"-Methode auf, wenn die Pixel nicht
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gesetzt sind. Ein Pixel kann durch "canvas.set_pixel(x, y)" gesetzt
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gesetzt sind. Ein Pixel kann durch "canvas.set_pixel(x, y)" gesetzt
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werden.
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werden.
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*************/
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*************/
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if (canvas.get_pixel(x, y))
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{
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return;
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}
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}
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canvas.set_pixel(x, y);
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// call neighbours with bounds check
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if (x > 0)
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{
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draw(x - 1, y);
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}
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if (y > 0)
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{
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draw(x, y - 1);
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}
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if (y < canvas.get_height() - 1)
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{
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draw(x, y + 1);
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}
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if (x < canvas.get_width() - 1)
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{
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draw(x + 1, y);
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}
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}
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// Put debug output into the stream "stream" to be displayed in the
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// Put debug output into the stream "stream" to be displayed in the
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// main window
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// main window
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