Popout PaletteEditor, general housekeeping
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scawful
222
src/app/gui/canvas.cc
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222
src/app/gui/canvas.cc
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#include "canvas.h"
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#include <imgui/imgui.h>
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#include <cmath>
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#include <string>
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#include "app/gfx/bitmap.h"
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#include "app/rom.h"
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namespace yaze {
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namespace gui {
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// Background for the Canvas represents region without any content drawn to it,
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// but can be controlled by the user.
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void Canvas::DrawBackground(ImVec2 canvas_size) {
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canvas_p0_ = ImGui::GetCursorScreenPos();
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if (!custom_canvas_size_) canvas_sz_ = ImGui::GetContentRegionAvail();
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if (canvas_size.x != 0) canvas_sz_ = canvas_size;
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canvas_p1_ = ImVec2(canvas_p0_.x + canvas_sz_.x, canvas_p0_.y + canvas_sz_.y);
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draw_list_ = ImGui::GetWindowDrawList(); // Draw border and background color
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draw_list_->AddRectFilled(canvas_p0_, canvas_p1_, IM_COL32(32, 32, 32, 255));
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draw_list_->AddRect(canvas_p0_, canvas_p1_, IM_COL32(255, 255, 255, 255));
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}
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// Context Menu refers to what happens when the right mouse button is pressed
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// This routine also handles the scrolling for the canvas.
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void Canvas::DrawContextMenu() {
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// This will catch our interactions
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const ImGuiIO &io = ImGui::GetIO();
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ImGui::InvisibleButton(
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"canvas", canvas_sz_,
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ImGuiButtonFlags_MouseButtonLeft | ImGuiButtonFlags_MouseButtonRight);
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const bool is_active = ImGui::IsItemActive(); // Held
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const ImVec2 origin(canvas_p0_.x + scrolling_.x,
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canvas_p0_.y + scrolling_.y); // Lock scrolled origin
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const ImVec2 mouse_pos_in_canvas(io.MousePos.x - origin.x,
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io.MousePos.y - origin.y);
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// Pan (we use a zero mouse threshold when there's no context menu)
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if (const float mouse_threshold_for_pan = enable_context_menu_ ? -1.0f : 0.0f;
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is_active &&
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ImGui::IsMouseDragging(ImGuiMouseButton_Right, mouse_threshold_for_pan)) {
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scrolling_.x += io.MouseDelta.x;
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scrolling_.y += io.MouseDelta.y;
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}
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// Context menu (under default mouse threshold)
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if (ImVec2 drag_delta = ImGui::GetMouseDragDelta(ImGuiMouseButton_Right);
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enable_context_menu_ && drag_delta.x == 0.0f && drag_delta.y == 0.0f)
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ImGui::OpenPopupOnItemClick("context", ImGuiPopupFlags_MouseButtonRight);
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// Contents of the Context Menu
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if (ImGui::BeginPopup("context")) {
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ImGui::MenuItem("Show Grid", nullptr, &enable_grid_);
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if (ImGui::MenuItem("Reset Position", nullptr, false)) {
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scrolling_.x = 0;
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scrolling_.y = 0;
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}
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if (ImGui::MenuItem("Remove all", nullptr, false, points_.Size > 0)) {
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points_.clear();
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}
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ImGui::EndPopup();
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}
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}
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// Tile painter shows a preview of the currently selected tile
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// and allows the user to left click to paint the tile or right
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// click to select a new tile to paint with.
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bool Canvas::DrawTilePainter(const Bitmap &bitmap, int size) {
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const ImGuiIO &io = ImGui::GetIO();
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const bool is_hovered = ImGui::IsItemHovered(); // Hovered
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const ImVec2 origin(canvas_p0_.x + scrolling_.x,
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canvas_p0_.y + scrolling_.y); // Lock scrolled origin
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const ImVec2 mouse_pos_in_canvas(io.MousePos.x - origin.x,
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io.MousePos.y - origin.y);
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if (is_hovered) {
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// Reset the previous tile hover
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if (!points_.empty()) {
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points_.clear();
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}
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// Calculate the coordinates of the mouse
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ImVec2 draw_tile_outline_pos;
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draw_tile_outline_pos.x =
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std::floor((double)mouse_pos_in_canvas.x / size) * size;
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draw_tile_outline_pos.y =
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std::floor((double)mouse_pos_in_canvas.y / size) * size;
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auto draw_tile_outline_pos_end =
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ImVec2(draw_tile_outline_pos.x + size, draw_tile_outline_pos.y + size);
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points_.push_back(draw_tile_outline_pos);
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points_.push_back(draw_tile_outline_pos_end);
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if (bitmap.IsActive()) {
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draw_list_->AddImage(
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(void *)bitmap.GetTexture(),
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ImVec2(origin.x + draw_tile_outline_pos.x,
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origin.y + draw_tile_outline_pos.y),
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ImVec2(origin.x + draw_tile_outline_pos.x + bitmap.GetWidth(),
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origin.y + draw_tile_outline_pos.y + bitmap.GetHeight()));
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}
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if (ImGui::IsMouseClicked(ImGuiMouseButton_Left)) {
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// Draw the currently selected tile on the overworld here
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// Save the coordinates of the selected tile.
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drawn_tile_pos_ = mouse_pos_in_canvas;
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return true;
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}
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} else {
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// Erase the hover when the mouse is not in the canvas window.
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points_.clear();
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}
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return false;
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}
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// Dictates which tile is currently selected based on what the user clicks
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// in the canvas window. Represented and split apart into a grid of tiles.
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void Canvas::DrawTileSelector(int size) {
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const ImGuiIO &io = ImGui::GetIO();
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const bool is_hovered = ImGui::IsItemHovered(); // Hovered
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const ImVec2 origin(canvas_p0_.x + scrolling_.x,
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canvas_p0_.y + scrolling_.y); // Lock scrolled origin
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const ImVec2 mouse_pos_in_canvas(io.MousePos.x - origin.x,
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io.MousePos.y - origin.y);
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if (is_hovered && ImGui::IsMouseClicked(ImGuiMouseButton_Left)) {
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if (!points_.empty()) {
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points_.clear();
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}
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ImVec2 draw_tile_outline_pos;
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draw_tile_outline_pos.x =
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std::floor((double)mouse_pos_in_canvas.x / size) * size;
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draw_tile_outline_pos.y =
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std::floor((double)mouse_pos_in_canvas.y / size) * size;
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points_.push_back(draw_tile_outline_pos);
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points_.push_back(
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ImVec2(draw_tile_outline_pos.x + size, draw_tile_outline_pos.y + size));
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}
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}
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// Draws the contents of the Bitmap image to the Canvas
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void Canvas::DrawBitmap(const Bitmap &bitmap, int border_offset, bool ready) {
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if (ready) {
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draw_list_->AddImage(
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(void *)bitmap.GetTexture(),
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ImVec2(canvas_p0_.x + border_offset, canvas_p0_.y + border_offset),
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ImVec2(canvas_p0_.x + (bitmap.GetWidth() * 2),
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canvas_p0_.y + (bitmap.GetHeight() * 2)));
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}
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}
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void Canvas::DrawBitmap(const Bitmap &bitmap, int x_offset, int y_offset) {
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draw_list_->AddImage(
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(void *)bitmap.GetTexture(),
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ImVec2(canvas_p0_.x + x_offset + scrolling_.x,
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canvas_p0_.y + y_offset + scrolling_.y),
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ImVec2(canvas_p0_.x + x_offset + scrolling_.x + (bitmap.GetWidth()),
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canvas_p0_.y + y_offset + scrolling_.y + (bitmap.GetHeight())));
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}
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void Canvas::DrawOutline(int x, int y, int w, int h) {
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ImVec2 origin(canvas_p0_.x + scrolling_.x + x,
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canvas_p0_.y + scrolling_.y + y);
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ImVec2 size(canvas_p0_.x + scrolling_.x + x + w,
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canvas_p0_.y + scrolling_.y + y + h);
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draw_list_->AddRect(origin, size, IM_COL32(255, 255, 255, 255));
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}
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// Canvas Wrapper for a Rectangle
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void Canvas::DrawRect(int x, int y, int w, int h, ImVec4 color) {
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ImVec2 origin(canvas_p0_.x + scrolling_.x + x,
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canvas_p0_.y + scrolling_.y + y);
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ImVec2 size(canvas_p0_.x + scrolling_.x + x + w,
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canvas_p0_.y + scrolling_.y + y + h);
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draw_list_->AddRectFilled(origin, size,
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IM_COL32(color.x, color.y, color.z, color.w));
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}
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// Canvas Wrapper for Text
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void Canvas::DrawText(std::string text, int x, int y) {
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draw_list_->AddText(
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ImVec2(canvas_p0_.x + scrolling_.x + x, canvas_p0_.y + scrolling_.y + y),
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IM_COL32(255, 255, 255, 255), text.data());
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}
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void Canvas::DrawGrid(float grid_step) {
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// Draw grid + all lines in the canvas
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draw_list_->PushClipRect(canvas_p0_, canvas_p1_, true);
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if (enable_grid_) {
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for (float x = fmodf(scrolling_.x, grid_step); x < canvas_sz_.x;
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x += grid_step)
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draw_list_->AddLine(ImVec2(canvas_p0_.x + x, canvas_p0_.y),
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ImVec2(canvas_p0_.x + x, canvas_p1_.y),
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IM_COL32(200, 200, 200, 40));
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for (float y = fmodf(scrolling_.y, grid_step); y < canvas_sz_.y;
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y += grid_step)
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draw_list_->AddLine(ImVec2(canvas_p0_.x, canvas_p0_.y + y),
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ImVec2(canvas_p1_.x, canvas_p0_.y + y),
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IM_COL32(200, 200, 200, 40));
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}
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}
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void Canvas::DrawOverlay() {
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const ImVec2 origin(canvas_p0_.x + scrolling_.x,
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canvas_p0_.y + scrolling_.y); // Lock scrolled origin
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for (int n = 0; n < points_.Size; n += 2) {
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draw_list_->AddRect(
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ImVec2(origin.x + points_[n].x, origin.y + points_[n].y),
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ImVec2(origin.x + points_[n + 1].x, origin.y + points_[n + 1].y),
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IM_COL32(255, 255, 255, 255), 1.0f);
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}
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draw_list_->PopClipRect();
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}
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} // namespace gui
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} // namespace yaze
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