feat: polyline drawing

src/application/applicationstate.c

@@ -0,0 +1,85 @@
+#include "./applicationstate.h"
+#include "src/core/primitives.h"
+#include "src/core/raster.h"
+#include "src/ui/vektorcanvas.h"
+
+typedef struct button_tool_set_data {
+    VektorAppState* state;
+    VektorAppTool tool;
+} button_tool_set_data;
+
+static void appstate_set_tool(GtkButton* button, gpointer user_data) {
+    button_tool_set_data* data = (button_tool_set_data*)user_data;
+    data->state->selectedTool = data->tool;
+
+    // setting tool also resets selected primitive
+    data->state->selectedPrimitive = NULL;
+}
+
+static void canvas_onclick(GtkGestureClick* gesture, int n_press, double x, double y, gpointer user_data) {
+    vektor_appstate_canvas_click(user_data, x, y);
+}
+
+void vektor_appstate_canvas_click(VektorAppState* state, double x, double y) {
+    V2 pos = (V2){x,y};
+
+    begin_click_dispatch:
+    if(state->selectedTool == VektorLineTool) {
+        // create new polyline primitive if none is selected
+        if(state->selectedPrimitive == NULL) {
+            
+            VektorPolyline* line = vektor_polyline_new();
+            VektorPrimitive linePrimitive = (VektorPrimitive){
+                .kind = VEKTOR_POLYLINE, .polyline = line
+            };
+            vektor_primitivebuffer_add_primitive(state->primitiveBuffer, linePrimitive);
+            
+            state->selectedPrimitive = 
+                &(state->primitiveBuffer->primitives[state->primitiveBuffer->count - 1]);
+            
+        } else if (state->selectedPrimitive->kind != VEKTOR_POLYLINE) {
+            // selecting a tool resets the selection, so this condition
+            // should not happen
+            g_warning("Invalid selected primitive; polyline expected");
+            state->selectedPrimitive = NULL;
+            goto begin_click_dispatch; // retry
+        }
+        
+        
+        vektor_polyline_add_point(state->selectedPrimitive->polyline, pos);
+    }
+
+    vektor_framebuffer_rasterize(state->frameBuffer, state->primitiveBuffer);
+    vektor_canvas_drawfrom(state->frameBuffer, state->canvas);
+    vektor_canvas_update(state->canvas);
+}
+
+void vektor_appstate_new(VektorWidgetState* wstate, VektorAppState* stateOut) {
+    button_tool_set_data* data_linetool = malloc(sizeof(button_tool_set_data));
+    data_linetool->state = stateOut;
+    data_linetool->tool = VektorLineTool;
+
+    // populate appstate
+    stateOut->primitiveBuffer = malloc(sizeof(VektorPrimitiveBuffer));
+    *stateOut->primitiveBuffer = (VektorPrimitiveBuffer){0};
+    stateOut->frameBuffer = malloc(sizeof(VektorFramebuffer));
+    *stateOut->frameBuffer = vektor_framebuffer_new(400, 400);
+    stateOut->canvas = malloc(sizeof(VektorCanvas));
+    vektor_canvas_init(wstate, stateOut->canvas);
+
+    // link all the buttons
+    g_signal_connect(
+        G_OBJECT(wstate->workspaceButtonLinetool), 
+        "clicked", G_CALLBACK(appstate_set_tool), data_linetool);
+
+    // Add click gesture to canvas
+    GtkGesture* canvasClickGesture = gtk_gesture_click_new();
+    g_signal_connect(
+        G_OBJECT(canvasClickGesture), 
+        "pressed", G_CALLBACK(canvas_onclick), stateOut
+    );
+    gtk_widget_add_controller(
+        GTK_WIDGET(wstate->workspaceCanvas), 
+        GTK_EVENT_CONTROLLER(canvasClickGesture)
+    );
+}