initial commit

Author: lichendust

demo.odin

@@ -0,0 +1,79 @@
+package demo
+
+import "lena"
+
+WHITE  :: 1
+CYAN   :: 9
+BLUE   :: 10
+NAVY   :: 11
+YELLOW :: 15
+ORANGE :: 16
+
+CLOVER :: #load("demo.png")
+
+main :: proc() {
+	lena.init("Hello, Lena!", 128, 128, flags = {.HIDE_WINDOW, .HIDE_CURSOR})
+	defer lena.destroy()
+
+	lena.set_window_background(BLUE)
+
+	lena.set_text_color(WHITE)
+	lena.set_bold_color(YELLOW)
+
+	// if yellow is drawn over white, substitute orange
+	// and don't let yellow on yellow disappear
+	lena.set_blend_palette_pair(WHITE,  YELLOW, ORANGE)
+	lena.set_blend_palette_pair(YELLOW, YELLOW, ORANGE)
+
+	// if the cyan text is drawn over the navy background
+	// or the yellow cursor, flip it to white and orange
+	lena.set_blend_palette_pair(CYAN, NAVY,   WHITE)
+	lena.set_blend_palette_pair(CYAN, YELLOW, ORANGE)
+
+	// make a blank image to capture drawing
+	canvas := lena.create_image(128, 128)
+	defer lena.destroy_image(canvas)
+
+	// convert our clover PNG into a Lena image
+	clover := lena.create_image_from_png(CLOVER)
+	defer lena.destroy_image(clover)
+
+	lena.show_window()
+
+	for _ in lena.step() {
+		if lena.key_pressed(.F11) {
+			lena.toggle_fullscreen()
+		}
+
+		if lena.key_pressed(.ESCAPE) {
+			lena.quit()
+		}
+
+		mx, my := lena.get_cursor()
+
+		lena.clear_screen(CYAN)
+
+		if lena.mouse_held(.LEFT) {
+			// draw paint to canvas
+			lena.draw_circle_to_image(canvas, mx, my, 14, YELLOW, true)
+
+			// copy clovers to canvas but clipped to canvas alpha
+			lena.set_draw_state({.LOCK_ALPHA})
+			lena.draw_image_to_image(clover, canvas, 0, 0)
+		}
+
+		// draw composited canvas to screen
+		lena.set_draw_state({.BLEND})
+		lena.draw_image(canvas, 0, 0)
+
+		// draw yellow cursor
+		lena.draw_circle(mx, my, 14, YELLOW, true)
+
+		// draw both sets of text
+		lena.set_text_color(WHITE)
+		lena.draw_text("Welcome to |*Lena*!", 10, 54 - 47)
+
+		lena.set_text_color(CYAN)
+		lena.draw_text("Hold down |left click...", 10, 66 - 47)
+	}
+}